Document qm8KD6KXXOx0oxGvZgp2wBEK5

M a&6- f0! SAMPLING INVESTIGATION RESULTS LITTLE HOCKING WATER ASSOCIATION WELL FIELD WASHINGTON COUNTY, OHIO Date: April 2003 Project No.: 7482 18983762.00010 1D> ^ CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 000438 CONTAIN NO CBI WVDEP 17571 Sampling Investigation Results Table of Contents TABLE OF CONTENTS Executive Summary............................................................................................................iii 1.0 Introduction.................................................................................................................. 1 2.0 Environmental Setting.................................................................................................3 2.1 Geology............................................................................................................... 3 2.2 Hydrogeology......................................................................................................4 3.0 Sampling Approach.....................................................................................................5 4.0 Groundwater Sample Results.......................................................................................6 4.1 C-8 in Groundwater from Temporaiy Borings.................................................. 6 4.2 C-8 in Groundwater from Production and Test Wells....................................... 6 4.3 Groundwater Elevations in Production and Test Wells and Ohio River Stage.................................................................................................................... 8 5.0 Soil Sample Results..................................................................................................... 9 6.0 Site Conceptual Model............................................................................................... 10 6.1 Geology............................................................................................................. 10 6.2 Hydrogeology.................................................................................................... 10 6.3 C-8 Transport Mechanismsand Migration Pathways........................................11 7.0 Conclusions and Recommendations..........................................................................13 8.0 References.................................................................................................................. 15 Table 1 Table 2 Table 3 Table 4 TABLES C-8 in Groundwater from Temporary Borings C-8 in Production and Test Wells Groundwater Elevation Data for Production and Test Wells August 21, 2002 C-8 in Soil from Temporary Borings LHSIreportl Apr. 17, 03 Wilmington, DE 000439 i Sampling Investigation Results Table of Contents Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 FIGURES Site Location Map Production and Test Well Locations C-8 in Groundwater - January 2002 Idealized Ohio River Valley Cross-Section and Block Diagram Generalized Geologic Cross-Section at River Mile 190 Temporary Boring Locations C-8 Concentration Ranges in Groundwater Groundwater Elevation Contour Map - August 2002 C-8 Concentration Ranges in Soil Cross-section Location Map Cross-section A-A' Cross-section B-B' Cross-section C-C' APPENDICES Appendix A C-8 Analytical Reporting Appendix B Geologic Logs for Little Hocking Water Association Well Field Temporary Borings Appendix C Geologic Logs for Production and Test Wells (Provided by Little Hocking) LHSIreportI Apr. 17, 03 Wilmington, DE t 000440 ii Sampling Investigation Results Executive Summary EXECUTIVE SUMMARY DuPont conducted a field investigation of the Little Hocking Water Association well field in August 2002 in order to delineate ammonium perfluorooctanoate (C-8) concentrations in soil and groundwater near a test well, TW-4. Groundwater sampled from TW-4 in 2002 showed a C-8 concentration range of 12.3 to 37.1 ug/L. This report summarizes the work performed, presents results, and provides conclusions and recommendations. Recently, pursuant to a multi-media consent order issued by the West Virginia Departments of Environmental Protection and Health and Human Resources to DuPont on November 15, 2001 (Order No. GWR-2001-019; Consent Order), DuPont had submitted summary reports to the Ohio Environmental Protection Agency detailing the off-site investigation activities near the Washington Works facility. These reports assessed media-specific C-8 transport from the facility and concluded that migration of air emissions is the only probable transport mechanism for C-8 found in the Little Hocking Water Association well field. The field investigation of the Little Hocking Water Association well field focused on delineating depth-specific C-8 concentrations in soil and groundwater near TW-4. Concurrently, additional geoprobe borings, test wells and production wells were sampled in order to develop a site conceptual model for deposition and migration of C-8 in soil and groundwater at the Little Hocking Water Association well field. The following conclusions are drawn from the investigation results and other available data: All groundwater results are below the C-8 Assessment of Toxicity Team (CATT) established human health protective screening criteria for water (water C-8 SL; WVDEP 2002) of 150 ug/L. The C-8 concentrations in groundwater decreased with depth within the aquifer. The C-8 concentrations in groundwater at the top of the aquifer, within the silty clay, ranged from ND (<0.01 ug/L) to 78 ug/L, while C-8 concentrations at the bottom of the aquifer, within the sand and gravel, ranged from ND (<0.01 ug/L) to 8.58 ug/L (excluding results for TW-4). Consistently high pH values measured in TW-4 and other field observations indicate that this test well's construction is likely compromised, possibly due to a failed grout seal or to a failed well casing. Higher concentrations of C-8 measured in this well (ranging from 12.3 to 37.1 ug/L) are likely attributed to shallow groundwater that contains higher C-8 concentrations migrating downward into the deeper monitoring zone or into the well itself, which could happen if the grout seal or the well casing were to have failed. C-8 concentrations measured in this well are not likely to be truly representative of the deep aquifer. Drinking water is pumped from the bottom of the sand and gravel aquifer through the four production wells. The highest C-8 concentration measured in the four production wells was 8.58 ug/L, significantly lower than the human health protective water C-8 SL. The C-8 results for finished water, a combination of LHSIreportl Apr. 17. 03 Wilmington, DE 000441 iii Sampling Investigation Results Executive Summary waters from the production wells that is distributed to Little Hocking customers, ranged from 1.69 to 4.29 ug/L, also significantly lower than the water C-8 SL. All soil results are below the CATT-established human health protective screening criteria for soil (soil C-8 SL) of 240 mg/kg (WVDEP 2002). The highest soil C-8 concentration measured is 170 ug/kg (0.170 mg/kg). Most results for soil sampled below the water table are nondetectable. Overall, the very low concentrations of C-8 measured in the soils indicate that C-8 does not readily adsorb to soil, especially soils below the water table. C-8 results for soil and groundwater sampled immediately adjacent to TW-4 do not distinguish this test well as a source for higher C-8 concentrations in soil and groundwater. Overall, this investigation as completed, combined with the air emission modeling and groundwater modeling results and the available physiochemical data for C-8, are sufficient to understand the migration pathways of C-8 from the Washington Works facility and within the Little Hocking Water Association well field. Revised groundwater modeling by DuPont supports the previous conclusion that no potential groundwater migration pathway exists beneath the Ohio River to the Little Hocking Well field. Based on the current data available, DuPont believes the following pathway does exist. C-8 from the DuPont facility is transported via air emissions by wind and is deposited on the Little Hocking well field surface soils. Precipitation then leaches the C-8 downward through the unsaturated zone to the aquifer. Dissolved C-8 then migrates with groundwater within the aquifer. Groundwater containing low levels of C-8 is then pumped from the aquifer through the four production wells. Water from the production wells is mixed and the finished water, containing even lower levels of C-8, then enters the Little Hocking Water Association distribution system. This investigation as completed, combined with the overall understanding of C-8 migration pathways within the Little Hocking well field, is also sufficient to understand the distribution of C-8 in the test wells, including TW-4, in the production wells and in the finished water that enters the Little Hocking distribution system. In order to assess the impact of recent C-8 air emission reductions at the Washington Works facility, DuPont recommends continuing quarterly monitoring of C-8 in the four Little Hocking Water Association production wells and finished water for a period of two years. LHSIreportl Apr. 17, 03 Wilmington, DE 000442 iv Sampling Investigation Results Introduction 1.0 INTRODUCTION Pursuant to the multi-media consent order issued to DuPont on November 15, 2001 (Order No. GWR-2001-019; Consent Order), groundwater was sampled at public water supplies (PWS) along the Ohio River in West Virginia and Ohio. Groundwater was sampled to determine if releases of C-8 from the DuPont Washington Works facility (located in Washington, West Virginia) have impacted groundwater in the PWS. The PWS sampling was performed under the direction of the Groundwater Investigation Steering Team (GIST) which was established under the Consent Order. The Little Hocking Water Association well field, located across the Ohio River from the Washington Works facility in Washington County, Ohio, was included in this sampling. The locations of the Little Hocking Water Association well field and the DuPont Washington Works facility are shown in Figure 1. Four production wells at the Little Hocking Water Association well field (LHPSD1 through 4) were sampled in December 2001. The C-8 concentrations measured in the production wells ranged from 0.844 to 7.66 ug/L. To better understand the distribution of C-8 in the Little Hocking well field, a more extensive sampling event was conducted in January 2002, that included the sampling of finished water (the water distributed to customers) and booster station sampling points, and groundwater from all production and test wells in the well field. The locations of the production and test wells sampled in the Little Hocking well field are shown in Figure 2. A total of 19 groundwater samples, including one duplicate, were collected and analyzed from Little Hocking during the January 2002 sampling event. The concentrations of C-8 in finished water and booster station sampling points ranged from 1.69 to 1.94 ug/L. The C-8 concentrations measured for the production wells ranged from 0.744 to 6.22 ug/L. The C-8 results for nine of the ten test wells ranged from 0.364 to 4.48 ug/L. In test well 4 (TW-4), the concentration measured was 37.1 ug/L. Figure 3 shows the January 2002 distribution of C-8 results in the production and test wells. Based on the elevated result at TW-4 compared to the surrounding wells, the Ohio Environmental Protection Agency (OEPA) requested that DuPont conduct a focused field investigation to delineate C-8 concentrations in soil and groundwater near TW-4. In August 2002, DuPont conducted the field investigation at the Little Hocking Water Association well field. During this investigation, the following activities were performed: Advanced ten temporary soil borings Continuously monitored geologic information during the advancement of the ten temporary borings Sampled soil and groundwater and monitored groundwater parameters at various depths within the temporary borings LHSIreportl Apr. 17, 03 Wilmington, DE 000443 1 Sampling Investigation Results Introduction Sampled groundwater in all production and test wells and recorded groundwater elevations Measured Ohio River stage The C-8 Assessment of Toxicity Team (CATT), was assembled as required by the Consent Order to establish human health protective screening criteria for water (water C8 SL) and for soil (soil C-8 SL). In August 2002, while the field investigation was being conducted at Little Hocking, the CATT issued its final report and established the water C-8 SL at 150 ug/L and the soil C-8 SL at 240 mg/kg (WVDEP, 2002). Following the completion of the field activities at Little Hocking, groundwater samples were analyzed to measure C-8 concentrations. C-8 analytical results for groundwater were then compared to the CATT-established water C-8 SL. In August 2002, an analytical method for measuring C-8 in soils was still under development; therefore, soils sampled during the investigation were placed on-hold in a secure manner. The method development was completed in February 2003. C-8 analytical results for soils were finalized in March 2003. C-8 analytical results for soil were then compared to the CATTestablished soil C-8 SL. The analytical results were then evaluated in conjunction with geologic data available from Little Hocking Water Association and with geological data obtained from the temporary borings. A site conceptual model was then developed. This report documents the field investigation activities and the results of the investigation. In this report, the following sections are discussed: Environmental Setting (Section 2) Sampling Approach (Section 3) Groundwater Results (Section 4) Soil Sample Results (Section 5) The Little Hocking Site Conceptual Model (Section 6) Conclusions and Recommendations (Section 7) References (Section 8) LHSIreportl Apr. 17, 03 Wilmington, DE 000444 2 Sampling Investigation Results Environmental Setting 2.0 ENVIRONMENTAL SETTING 2.1 Geology The Little Hocking well field is located in the Ohio River Valley and consists of Quaternary alluvial sediments that overly the Permian-aged Dunkard Group. The two predominant facies of the Ohio River alluvium that have been identified in this area include coarse-grained Ohio River Alluvium (Pleistocene-aged glacial outwash deposits) and fine-grained Ohio River Alluvium [Holocene overbank deposits (Simard, 1989)]. The Pleistocene deposits consist primarily of coarse-grained sand and gravel while the Holocene deposits consist primarily of interbedded and laminated silt, clay and fine grained sand. The Dunkard Group (bedrock) consists primarily of red and varicolored sandy shale; gray, green and brown sandstone; gray and light-gray siltstone; and minor beds of coal, claystone, black carbonaceous shale and limestone. The facies of the Ohio River Alluvium formed in response to the glacial advances and retreats of the pre-, early- and late-Wisconsinan and were deposited as successive phases of aggradation and degradation of river valley alluvial materials. The coarse-grained Pleistocene alluvium was deposited as glacial outwash during the primary valley aggradation event following the glacial scouring of the valley into the bedrock floor. During the subsequent degredation and aggradation cycles of the Pleistocene, the glacial outwash sediments were partially removed, re-worked and then redeposited to a lower elevation than the previous cycle, thus forming a terrace. This process formed a series of Pleistocene-aged terrace surfaces within the Ohio River Valley. These surfaces were designated (youngest to oldest) as S4, S5, and S6 by Simard. With each subsequent degredation/aggradation cycle, additional fines were incorporated into the Pleistocene deposits due to continual influx of finer-grained fluvial sediments from tributaries of the Ohio River. As a result, the Pleistocene deposits become more highly re-worked and progressively finer-grained toward the center of the river valley, particularly in locations downstream of significant tributaries (Simard, 1989). The total thickness of Pleistocene sediments at Washington Bottom (located immediately south across the Ohio River from Little Hocking in West Virginia) ranges from about 80 feet beneath the highest Pleistocene terrace surfaces to about 15 feet beneath the current channel of the Ohio River. The Pleistocene alluvial deposits are overlain by the finer-grained Holocene sediments. The silts, clays, and fine sands were deposited on the surface of the Pleistocene terraces as well as on a series of more recent floodplains, which formed in the center of the Ohio River Valley during the Holocene. The thickness of the Holocene sediments typically ranges from 5 to 15 feet over the Pleistocene terrace surfaces and 25 to 35 feet over the Holocene floodplains. Simard designated the Holocene floodplain surfaces as SI through S3 and the modem floodplain of the Ohio River as SO. Figure 4, modified from Simard (1989), is a block diagram and idealized cross-section through the Ohio River valley depicting the complex set of Pleistocene terraces and Holocene floodplains which have formed in the valley. LHSIreportl Apr. 17, 03 Wilmington, DE 3 000445 Sampling Investigation Results Environmental Setting A generalized north-south cross-section from the Little Hocking Water Association well field in Ohio, through the Ohio River and across the Washington Works facility, is presented in Figure 5. This cross-section shows the floodplain and terrace surfaces, the Holocene silt and clay overbank deposits overlying the Pleistocene sand and gravel outwash deposits and the re-worked Pleistocene alluvium in the center of the river valley. The alluvial terrace deposits are underlain by a flat, river-scoured bedrock surface of the Dunkard Group that rises steeply and forms the valley walls to the North of Little Hocking Water Association and to the south of the Washington Works facility (Figure 1). 2.2 Hydrogeology Groundwater supplies in the region are obtained from the Dunkard Group bedrock and Ohio River alluvial terrace deposits. However, the saturated portion of the Ohio River alluvial terrace deposits comprise the principal regional aquifer used for water supply purposes. Production wells completed in this aquifer have been known to yield up to 500 gallons per minute (Schultz, 1984). Based on these high yields, numerous industrial and commercial water supply companies obtain water from the alluvial aquifer. The Ohio River Alluvial Aquifer is the primary water-table aquifer in the area. This aquifer occurs at a depth of 15 to 30 feet below ground surface in the Little Hocking well field. The saturated zone is approximately 30 to 40 feet thick, extending approximately to the surface of the underlying Dunkard Group bedrock. Numerous pumping tests have been completed in the alluvial aquifer in the Washington Bottom area as part of water supply investigations. The hydraulic conductivity of the alluvial aquifer in the area typically ranges from 100 to 300 ft./d (Legggette, Brashears & Graham, Inc., 1986; Burgess & Niple Ltd., 1988). In contrast, the hydraulic conductivity of the underlying Dunkard Group bedrock aquifer is typically between 0.05 and 5 ft./d (Kozar and Mathes, 2 0 0 1 ). Natural recharge to the alluvial aquifer comes from various sources, including: Infiltration of precipitation falling directly on the alluvium Lateral movement of the river water through the alluvium Seepage from stream tributaries that discharge to the Ohio River Surface run-off from the outcrop areas of the Dunkard Group, which form steep slopes adjacent to the uppermost Pleistocene terrace. LHSIreportl Apr. 17, 03 Wilmington, DE 000446 4 Sampling Investigation Results Sampling Approach 3.0 SAMPLING APPROACH In order to evaluate the elevated C-8 concentrations in TW-4, DuPont implemented a focused sampling approach that delineated horizontally and vertically the C-8 concentrations in groundwater near this test well. This sampling plan was developed with assistance from the OEPA and was submitted to and approved by the OEPA in early August 2002 (DuPont, 2002a). The locations of temporary borings advanced are shown in Figure 5. TW-4 was used as the center point, and six radial sampling segments were established north, northeast, southeast, south, west, and northwest. Along each segment, soil and groundwater or only groundwater were sampled from the temporary borings. Figure 5 shows the locations of the two borings where soil and groundwater were sampled and the locations of the eight borings where only groundwater was sampled. In two borings where soil and groundwater were sampled, sampling was planned at the following depths from ground surface. Soil at the surface at 5-foot intervals below ground surface to the top of the sand and gravel aquifer (approximately 30 feet below grade) at 5-foot intervals from the top of the sand and gravel aquifer to the bottom of the aquifer (estimated at 50 to 55 feet below grade) at the geologic interfaces Groundwater at first encountered water (approximately 17 to 20 feet below grade) at 5-foot intervals from first encountered groundwater to the bottom of the sand and gravel aquifer (estimated at 50 to 55 feet below grade). at the geologic interfaces At all other temporary boring locations, groundwater sampling was planned at two depths, at first encountered water (approximately 17 to 20 feet below grade) and at the bottom of the sand and gravel aquifer (estimated at 50 to 55 feet below grade). In addition, DuPont scheduled the Consent Order-required 3Q02 PWS sampling event, which includes sampling the four production wells and TW-4 at Little Hocking, to coincide with the field investigation. The Little Hocking test wells, that are not required sampling points in the quarterly PWS sampling, were sampled as part of the field investigation, including TW-1 through TW-6 and TW-9 through TW-12 (Figure 2). Groundwater elevations were measured in the test and production wells prior to sampling the wells. Ohio River stage was also measured using the datum located on the Kraton Polymers property, located immediately east of the Little Hocking well field, with the assistance of a Senior Environmental Engineer from Kraton. LHSIreportl Apr. 17, 03 Wilmington, D 5 000447 Sampling Investigation Results Groundwater Sample Results 4.0 GROUNDWATER SAMPLE RESULTS For groundwater sampled from production wells, test wells and the temporary borings, sampling was conducted as described in the Quality Assurance Project Plan (DuPont 2002b) and in the Sampling Investigation Plan for Little Hocking Water Association Well Field (DuPont, 2002a). Appendix A provides information on C-8 analytical reporting. 4.1 C-8 in Groundwater from Temporary Borings Groundwater sampled at various depths from the ten temporary borings was analyzed for C-8. Table 1 presents the C-8 results for the groundwater samples. The first part of the sample name indicates the investigation and the sample type (WWO-G; Washington Works, Ohio, groundwater). The second part of the sample name indicates from which temporaiy boring the sample was collected (i.e. LHWAN1 is boring LHWAN-1; see Figure 6 for temporary boring locations). The third part of the sample name indicates the depth below ground surface from which the groundwater was sampled. Figure 7 shows the range in C-8 concentrations measured in each of the temporary borings. In total, 18 samples (including one duplicate sample) were collected from the ten temporary borings (Table 1). Samples of first water encountered were collected from all ten borings. Samples from greater depths were collected from three borings. At the boring closest to TW-4, LHWASW-1, samples were collected every five feet from the first water encountered to the bottom of the sand and gravel aquifer. Note, not all planned sampling was completed. The field investigation proceeded slower than expected due to changing field conditions (stabilization of field parameters, particularly turbidity, took much longer than anticipated) and interruptions by the oversight consultant. As a consequence, not all groundwater and soils targeted in the work plan were sampled. The C-8 concentrations measured in the groundwater sampled from temporary borings ranged from non-detectable (<0.01 ug/L; ND) to 78 ug/L and do not exceed the CATTestablished human health protective water C-8 SL of 150 ug/L. In general, C-8 concentrations are higher at the first water encountered than at greater depths within the aquifer or at the bottom of the aquifer. The distribution of C-8 vertically and horizontally within the well field is discussed in detail in Section 6 which presents the site conceptual model for C-8 in soil and groundwater at Little Hocking. 4.2 C-8 in Groundwater from Production and Test Wells Table 2 presents the PWS sampling C-8 results for the Little Hocking Water Association. The data for the well field investigation conducted in August 2002, including the data from the four production wells and all ten test wells are highlighted in blue. At the bottom of Table 2 are data from finished water and booster station sampling points. These are samples of the water that is being distributed to Little Hocking Water Association customers. Finished water was inadvertently not sampled during the well LHSIreportl Apr. 17, 03 Wilmington, DE 6 000448 Sampling Investigation Results Groundwater Sample Results field sampling. Table 2 also provides data from the 4Q02 and the 1Q03 PWS sampling events in which the four production wells, TW-4 and finished water were sampled. During the well sampling and PWS sampling, all of the C-8 concentrations measured in the production and test wells and in the finished water were well below the water C-8 SL of 150 ug/L that was established by the CATT (WVDEP, 2002). Figure 7 shows the range of C-8 measured at each production and test well using all the data for each well summarized in Table 2. The highest concentration of C-8 measured in a production or test well, excluding TW-4, was 8.58 ug/L. C-8 concentrations measured in TW-4, which was the focus of this investigation, have been variable. The C-8 concentration in this test well has ranged from 12.3 to 37.1 ug/L. These levels are higher than in any other test or production well in the Little Hocking well field. However, field and laboratory measurements and field observations, discussed below, suggest that the integrity of this test well is compromised. Table 2 provides the pH data for the groundwater sampled collected from the production and test wells. The pH measured for all production and test wells, except for TW-4, has ranged from 6.72 to 7.94. However, the pH values measured in TW-4 are much higher, and have ranged from 9.22 to 12.61. High pH values are commonly associated with cement-bentonite grout (Colangelo et al. 1986). Bentonite, which is commonly used as grouting material in well construction, is a clay mineral containing calcium, aluminum and iron. A comparison of groundwater analytical results between TW-4 and Well #2, one of the four production wells, also shows that TW-4 has approximately twice as much calcium and three times as much iron and aluminum than Well #2 (OEPA, 2002). Field activities show that a three-inch pump that fits in the upper portion of the belowsurface PVC pipe of TW-4, gets stuck in the PVC pipe at depth. The one and one half inch pump, on the other hand, can be lowered to the bottom of the well. This observation indicates that the PVC pipe is not completely straight. A bent PVC pipe may indicate a problem with the joint between lengths of PVC pipe that could allow grout contamination into the well. Furthermore, particles of a crusty, white material, which may be grout, are frequently found on the pump when it is removed from the well. In addition, water from TW-4 also is frequently a milky to grayish color. The consistently high pH values, water chemistry, and other field observations from this well likely indicate the integrity of the well is compromised, most likely by a failed grout seal or a failed well casing related to the bend in the PVC pipe. A failed grout seal or a failed well casing would allow shallow groundwater, which contains higher concentrations of C-8, to migrate into the deeper monitoring zone and would result in unusually high C-8 concentrations in the test well compared to C-8 concentrations measured in other production and test wells. Because of the compromised integrity of TW-4, it is likely that samples of groundwater from this well are not representative of typical conditions within the deeper portions of the sand and gravel aquifer. LHSIrepoM Apr. 17, 03 Wilmington, DE 000449 7 Sampling Investigation Results Groundwater Sample Results The distribution of C-8 in the production and test wells in the Little Hocking well field is discussed in detail in Section 6, which presents the site conceptual model for C-8 in soil and groundwater in the Little Hocking Water Association well field. 4.3 Groundwater Elevations in Production and Test Wells and Ohio River Stage Groundwater elevations were measured in all production and test wells sampled in the Little Hocking well field. In addition, the Ohio River stage was measured. Table 3 provides the surveyed measuring point elevations of the production and test wells, the depths to water measured and the calculated groundwater elevations. The Ohio River stage is also presented in this table. Figure 8 presents the groundwater elevation contour map of the Little Hocking well field for August 21, 2002. The pumping of the production wells results in the development of a cone of depression surrounding the production wells with groundwater flowing towards the production wells from all directions. Because the four production wells are cycled on and off, the cone of depression shifts its position depending on which production wells that are pumping at the time. Groundwater elevations and flow directions within the Little Hocking well field aquifer are discussed in more detail in Section 6, which presents the site conceptual model for C-8 in soil and groundwater at the Little Hocking well field. LHSIreportl Apr. 17, 03 Wilmington, DE 000450 8 Sampling Investigation Results Soil Sample Results 5.0 SOIL SAMPLE RESULTS For soil sampled from the temporary borings, sampling was conducted as described in the Sampling Investigation Plan (DuPont, 2002b). In total, 22 soil samples, including one duplicate sample, were collected from two temporary borings, LHWASW-1 and LHWANW-1. Table 4 provides the sample names, sample dates, the C-8 concentration measured and comments. The sample nomenclature is similar to that employed for the groundwater samples. The first part of the sample name indicates the investigation and the sample type (WWO-S; Washington Works, Ohio, soil). The second part of the sample name indicates from which temporary boring the sample was collected (i.e. LHWASW1 is boring LHWASW-1). The third part of the sample name indicates the depth below ground surface where the sample was collected. The Comments column, on the far right, provides a brief description of the sample. The C-8 concentrations measured from the two borings ranged from ND (<2 ug/kg) to 170 ug/kg in LHWASW-1 and from ND to 110 ug/kg in LHWANW-1 (Figure 9). In general, the concentrations of C-8 measured decreases with sampling depth in both of the temporary borings. The C-8 concentrations measured in soil from the temporary borings are significantly lower than the human health protective soil C-8 SL (240 mg/kg or 240,000 ug/kg) that was established by the CATT (WVDEP, 2002). C-8 concentrations measured in soils from the Little Hocking well field are discussed in detail in Section 6, which presents the site conceptual model for C-8 in soil and groundwater at the Little Hocking Water Association well field. LHSIreportl Apr. 17, 03 Wilmington, DE 000451 9 Sampling Investigation Results Site Conceptual Model 6.0 SITE CONCEPTUAL MODEL 6.1 Geology Using the geologic data available from the temporary borings and the production and test wells, three cross-sections (A-A', B-B', and C-C') were generated for the Little Hocking well field. Appendix B provides the geologic logs for the temporary borings. Geological logs for the production and test wells (made available to DuPont by the Little Hocking Water Association) are provided in Appendix C. The cross-section location map is provided in Figure 10. Cross-sections A-A' and B-B' generally run north to south and CC' runs west to east. Cross-sections A-A', B-B', and C-C' are presented in Figures 11, 12, and 13, respectively. These cross-sections show that the stratigraphy of the Little Hocking well field is comprised of three lithological units (from ground surface downward): Holocene overbank deposits (approximately 25-40 feet of a low permeable silty clay or sandy clay or sand and clay) Pleistocene glacial outwash deposits (approximately 20-35 feet of sand and gravel which is the site aquifer) Dunkard Group bedrock (shale) The composition of the Holocene overbank deposits is variable. In the western part of the well field, silty clay and clay are observed, while in the eastern portion sand and clay and/or sandy clay is found. The contact between the upper silty clay and the underlying sand and gravel is an erosional surface, characterized in some locations by channels cut into the sand and gravel (Figure 13). The composition of the sand and gravel unit is also variable, consisting of sand, sand and gravel, silty sand, and clayey sand. Where encountered in the temporary borings, the underlying bedrock is a micaceous, greenish gray siltstone. The logs for the production and temporary wells indicate that bedrock consists of red and blue shale, red clay and sandstone. 6.2 Hydrogeology Cross-sections A-A', B-B' and C-C' also show the groundwater elevation for August 21, 2002 based on data measured at the production and test wells. At the time water levels were measured, Well #1, Well #2 and Well #3 were being pumped and Well #5 was not being used. The cone of depression around these three wells can be seen most obviously on cross-section C-C' (Figure 13), but can also be observed on B-B' (Figure 12). The groundwater contour map, which also shows the drawdown from the pumping wells, is provided in Figure 8. The hydraulic conductivity of the alluvial aquifer in the area typically ranges from 100 to 300 ft./day. Because of the high hydraulic conductivity, it is likely that the cone of depression shifts its position rapidly with the cycling on and off of the four production wells. Ohio River stage, 582.24 ft mean sea level, is higher than in LHSIrepom Apr. 17, 03 Wilmington, DE 10 000452 Sampling Investigation Results Site Conceptual Model the test production and test wells. Therefore, water from the river flows into the site aquifer. Precipitation also is a minor recharge source for the Little Hocking well field. 6.3 C-8 Transport Mechanisms and Migration Pathways Based on our current knowledge, the following paragraphs describe the transport mechanisms and migration pathways for C-8 from the Washington Works facility. A groundwater model was developed for the Washington Works facility as part of the RFI report for Washington Works (DuPont, 1999). The Consent Order required refinement of the groundwater model for the facility to re-evaluate the extent of groundwater captured by the pumping wells at the site and to confirm that off-site migration of C-8 impacted groundwater is not occurring. To meet these requirements, refinement of the groundwater modeling work was completed with input, guidance, and critical review from the United States Geological Survey, the USACOE, the West Virginia Department of Health and Human Resources, and GIST members during the model development, calibration, and finalization process. The report of final findings for the revised groundwater model for the facility and the surrounding area was submitted to the GIST in January 2003 (DuPont, 2003). The revised groundwater model supports DuPont's previous conclusions that no off-site migration of groundwater is known to be occurring and that no potential groundwater migration pathway exists beneath the Ohio River to the Little Hocking well field. However, DuPont had released, and continues to release, C-8 in air emissions from the Washington Works facility. C-8 is emitted to the atmosphere in two phases, a vapor phase, and a particulate phase. In May 2002, additional control equipment was installed at the facility to reduce C-8 emissions. There has been approximately a 65 percent decrease in total C-8 air emissions since the installation of this equipment compared to levels measured for 1999, when C-8 emission levels were at their highest. Continued reductions in C-8 emissions from the facility are anticipated during the next few years as abatement efficiency improvement projects are completed. The Little Hocking well field is located directly north of the Washington Works facility across the Ohio River into Ohio. Wind direction data show that the Little Hocking well field is downwind of the facility and the predominant wind flow. Air emissions modeling by DuPont indicates that some C-8 in emissions from the Washington Works facility migrate over the Little Hocking well field. Some C-8 in the vapor and particulate phases, emitted from the facility and transported by wind, is deposited on the surface soil at the Little Hocking well field. The concentrations of C-8 measured in surface soils (i.e. 0-1 foot depth) sampled during this investigation were 110 ug/kg and 170 ug/kg (Figure 11). C-8 is then leached by the precipitation from surface soils to surface-water bodies and/or infiltration into surface soils. Dissolved C-8 continues migrating downward in the unsaturated zone with the infiltrating precipitation. The C-8 concentration in the soils below the surface, in the unsaturated zone, ranged from 3.4 to 13 ug/kg, almost an order of magnitude lower than the concentrations of C-8 measured at the surface (see LHWAN-1 and LHWASW-1 in LHSIreportl Apr. 17, 03 Wilmington, DE 11 *>00453 Sampling Investigation Results Site Conceptual Model Figure 11). The low permeability of the upper silty clay likely slows the rate of downward migration of precipitation. In addition, the rate and direction of migration of precipitation likely changes with the different lithologies encountered in the Holocene overbank deposits. For example, precipitation might migrate slowly downward through the silty clay and then migrate laterally in a sand lens at a much faster rate. Soil-type differences may also be responsible for the highly variable C-8 concentrations measured within the groundwater in silty clay unit (compare LHWAS-1 with C-8 concentration of nondetectable to LHWAS-2 having C-8 at 78 ug/L). In addition, the rate of precipitation and the level of the water table likely have some control over the rate of migration of dissolved C-8. However, because C-8 is highly soluble (Fluoropolymers Manufacturers Group, 2001), it does not tend to precipitate or sorb to particles in the soil but it remains in solution and migrates with groundwater. The concentrations of C-8 in groundwater at the top of the water table are higher than the concentration of C-8 just below at the lithologic contact between the silty clay and the sand and gravel (Figure 11). These data indicate that the overall the concentration of C-8 decreases with depth in the water table within the silty clay. Alternatively, these data also may reflect the increased permeability in the sand and gravel compared to the silty clay. The C-8 concentration measured in a single boring at various depths show that the concentration of C-8 in groundwater and soil decreases with depth within the aquifer (Figure 11) as the dissolved C-8 migrates within the sand and gravel aquifer. However, the C-8 concentration at the base of the sand and gravel aquifer (i.e. position of the well screens) is somewhat variable and does not seem to show a trend with groundwater flow direction towards the pumping wells. Table 2 shows that C-8 concentrations are consistent within a single production well but that the concentrations are different between the production wells. Well #3 consistently has the lowest C-8 concentration (less than lug/L) whereas Well #5 consistently has the highest C-8 concentration (ranging from5.69 to 8.59 ug/L). Because the four production wells are cycled on and off and the C-8 concentrations measured in the wells are not the same, the C-8 concentration in the finished water is variable. Table 2 shows the concentration of C-8 in finished water has ranged from 1.69 to 4.29 ug/L. Briefly summarized, DuPont currently believes that C-8 from the DuPont facility is transported via air emissions by wind and is deposited on the Little Hocking well field surface soils. Precipitation leaches the C-8 downward through the unsaturated zone to the aquifer. Dissolved C-8 then migrates with groundwater within the aquifer. Groundwater containing low levels of C-8 is then pumped from the aquifer through the production wells. Water from the four production wells is mixed and water containing even lower levels of C-8 (the finished water) then enters the Little Hocking Water Association distribution system. C-8 concentrations in finished water from Little Hocking are significantly below the human health protective water C-8 SL of 150 ug/L (WVDEP 2002). LHSIreportl Apr. 17, 03 Wilmington, DE 000454 12 Sampling Investigation Results Conclusions and Recommendations 7.0 CONCLUSIONS AND RECOMMENDATIONS Based on the investigation at the Little Hocking Water Association well field and other data available, the following conclusions can be made: All groundwater results are below the C-8 Assessment of Toxicity Team (CATT) established human health protective screening criteria for water (water C-8 SL; WVDEP 2002) of 150 ug/L. The C-8 concentrations in groundwater decreased with depth within the aquifer. The C-8 concentrations in groundwater at the top of the aquifer, within the silty clay, ranged from ND (<0.01 ug/L) to 78 ug/L, while C-8 concentrations at the bottom of the aquifer, within the sand and gravel, ranged from ND (<0.01 ug/L) to 8.58 ug/L (excluding results for TW-4). Consistently high pH values measured in TW-4 and other field observations indicate that this test well's construction is likely compromised, possibly due to a failed grout seal or to a failed well casing. Higher concentrations of C-8 measured in this well (ranging from 12.3 to 37.1 ug/L) are likely attributed to shallow groundwater that contains higher C-8 concentrations migrating downward into the deeper monitoring zone or into the well itself, which could happen if the grout seal or the well casing were to have failed. C-8 concentrations measured in this well are not likely to be truly representative of the deep aquifer. Drinking water is pumped from the bottom of the sand and gravel aquifer through the four production wells. The highest C-8 concentration measured in the four production wells was 8.58 ug/L, significantly lower than the human health protective water C-8 SL. The C-8 results for finished water, a combination of waters from the production wells that is distributed to Little Hocking customers, ranged from 1.69 to 4.29 ug/L, also significantly lower than the water C-8 SL. All soil results are below the CATT-established human health protective screening criteria for soil (soil C-8 SL) of 240 mg/kg (WVDEP 2002). The highest soil C-8 concentration measured is 170 ug/kg (0.170 mg/kg). Most results for soil sampled below the water table are nondetectable. Overall, the very low concentrations of C-8 measured in the soils indicate that C-8 does not readily adsorb to soil, especially soils below the water table. C-8 results for soil and groundwater sampled immediately adjacent to TW-4 do not distinguish this test well as a source for higher C-8 concentrations in soil and groundwater. O Overall, this investigation as completed, combined with the air emission modeling and groundwater modeling results and the available physiochemical data for C-8, are sufficient to understand the migration pathways of C-8 from the Washington Works facility and within the Little Hocking Water Association well field. LHSIreportl Apr. 17, 03 Wilmington, DE 13 000455 Sampling Investigation Results Conclusions and Recommendations Revised groundwater modeling by DuPont supports the previous conclusion that no potential groundwater migration pathway exists beneath the Ohio River to the Little Hocking Well field. Based on the current data available, DuPont believes the following pathway does exist. C-8 from the DuPont facility is transported via air emissions by wind and is deposited on the Little Hocking well field surface soils. Precipitation then leaches the C-8 downward through the unsaturated zone to the aquifer. Dissolved C-8 then migrates with groundwater within the aquifer. Groundwater containing low levels of C-8 is then pumped from the aquifer through the four production wells. Water from the production wells is mixed and the finished water, containing even lower levels of C-8, then enters the Little Hocking Water Association distribution system. This investigation as completed, combined with the overall understanding of C-8 migration pathways within the Little Hocking well field, is also sufficient to understand the distribution of C-8 in the test wells, including TW-4, in the production wells and in the finished water that enters the Little Hocking distribution system. In order to assess the impact of recent C-8 air emission reductions at the Washington Works facility, DuPont recommends continuing quarterly monitoring of C-8 in the four Little Hocking Water Association production wells and finished water for a period of two years. LHSIreportl Apr. 17, 03 Wilmington, DE 14 000456 Sampling Investigation Results References 8.0 REFERENCES Burgess & Niple, Ltd. 1988. Blennerhassett Island Water Supply Well Drilling and Test Pumping, unpublished report. Colangelo, R. V., Cannestra, R. B., and Morehouse, J. T. 1986. The Effects o f Water Quality Data Due to Annular Space Material and Monitoring Well Specifications, Proceedings of the Ninth Annual Madison Waste Conference on Municipal and Industrial Waste, Madison, WI, pp. 100-120. DuPont 2003. Revised Groundwater Flow Model, DuPont Washington Works, Washington, WV January 2003. DuPont Corporate Remediation Group and URS Diamond. ______ 2002a. Sampling Investigation Plan for Little Hocking Water Association Well Field, Washington County, Ohio August 2002. DuPont Corporate Remediation Group and URS Diamond. ______ 2002b. Groundwater Investigation Quality Assurance Project Plan for Washington Works Plant, Washington Works, West Virginia January 2002. DuPont Corporate Remediation Group and URS Diamond. ______ 2001. Project-Specific Waste Management Proceduresfo r Letart Landfill, Local Landfill, Dry Run Landfill, Washington Works Plant and Designated Off-Site Areas November 2001. DuPont Corporate Remediation Group and URS Diamond. ______ 1999. RCRA Facility Investigation Report, DuPont Washington Works, June 30, 1999. DuPont Corporate Remediation Group and URS Diamond. 1999. RCRA Facility Investigation Report, DuPont Washington Works June 30, 1999. DuPont Corporate Remediation Group and URS Diamond. Fluoropolymer Manufacturers Group 2001. Guide to the safe Handling o f Fluoropolymer Dispersions October 2001. The Society of the Plastics Industry, Inc. Leggette, Brashears & Graham, Inc. 1986. Hydrogeologic Evaluation fo r Additional Water Supplyfrom Blennerhassett Island, unpublished report. Kozar, M.D. and M.V. Mathes, 2001. Aquifer-Characteristics Datafo r West Virginia. Water-Resources Investigations Report 01-4036, United States Geological Survey, 74 p. LHSIreportl Apr. 17, 03 Wilmington, DE 15 000457 Sampling Investigation Results References Ohio Environmental Protection Agency, 2002. Fax dated May 28, 2002, from Steve Williams (OEPA) to Andrew Hartten (DuPont) providing sampling results from Little Hocking TW-4 and Well #2 conducted on April 23, 2002. Simard, C. M. 1989 Geological History o f the Lower Terraces and Floodplains o f the Upper Ohio River Valley, Open File Report, West Virginia Geological Survey. 160 P. Schultz, R.A. 1984. Groundwater Hydrology o f the Minor Tributary Basins o f the Ohio River, West Virginia. WVDEP, 2002 Final Ammonium Perfluorooctanonate (C8) Assessment o f Toxicity Team (CATT) Report August 2002. West Virginia Department of Environmental Protection. Final LHSI report Apr. 17, 03 Wilmington, DE 00458 16 TABLES 000459 Table 1 C-8 in Groundwater from Temporary Borings Little Hocking Water Association Washington County, Ohio at jr ^S uroE M illB j WWO-G- LHWAN1 (17-22) WWO-G- LHWANE1 (21-27)* WWO-G- LHWANE1 (56-58) WWO-G- LHWANE2 (20.7-25.7) WWO-G- LHWAE1 (21-26) WWO-G- LHWAS1 (25-30) WWO-G- LHWAS2 (25-30) WWO-G- LHWASW1 (28.5-33) WWO-G- LHWASW1 (35-40)* WWO-G- LHWASW1 (40-45) WWO-G- LHWASW1 (45-50) WWO-G- LHWASW1 (50-55) WWO-G- LHWASW1 (55-56)* WWO-G- LHWAW1 (29-34) WWO-G- LHWAW2 (33-38) WWO-G- LHWANW1 (19-25) WWO-G- LHWANW1 (24-29) WWO-G- LHWANW1 (24-29)-2(DUP) Samolo. Date 8/29/02 8/20/02 8/22/02 8/30/02 8/30/02 8/28/02 8/27/02 8/23/02 8/26/02 8/26/02 8/28/02 8/28/02 8/28/02 8/29/02 8/29/02 8/29/02 8/29/02 8/29/02 50.8 5.58 0.662 1.28 0.416 ND (<0.01 ) 78 0.0912 1.32 1.02 0.376 0.166 0.254 ND (<0.01 ) 3.35 34.6 5.9 6.22 first water encountered first water encountered bottom of sand and gravel first water encountered first water encountered first water encountered first water encountered first water encountered every 5 ft groundwater sample every 5 ft groundwater sample every 5 ft groundwater sample every 5 ft groundwater sample bottom of sand and gravel first water encountered first water encountered first water encountered top of sand and gravel top of sand and gravel * Sample split with the Ohio EPA. 000460 4/17/03 Page 1 of 1 LH samples Table 2 C-8 in Production and Test Wells Little Hocking Water Association Washingon County, Ohio W ell W ell #1 W ell #2 W ell #3 W ell #5 TW -1 TW -2 TW -3 Sam ple Name LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSDTW1 LHPSDTW1 LHPSDTW 2 LHPSDTW 2 LHPSDTW 3 LHPSDTW 3 Sam ple Date 12/20/01 1/21/02 2/22/02 3/26/02 4/23/02 8/21/02 10/16/02 2/26/03 12/20/01 12/20/01 1/21/02 2/22/02 2/22/02 3/26/02 4/23/02 8/21/02 10/16/02 2/26/03 12/20/01 1/21/02 2/22/02 3/26/02 4/23/02 8 /2 1 /0 2 10/16/02 10/16/02 2/26/03 12/20/01 1/21/02 1/21/02 2/22/02 3/26/02 4/23/02 8/21/02 10/16/02 2/26/03 2/26/03 1/22/02 8/21/02 1/22/02 8/21/02 1/22/02 8/21/02 C-8 ug/l 1.82 1.72 2.37 2.99 2.02 3.65 3.41 3.38 3.72 3.52 2.97 2.03 2.07 3.31 3.4 4 .2 6 3.98 3.62 0.844 0.744 0.42 0.827 0.783 0.952 0.495 0.434 0.733 7.66 6.22 6.14 5.69 6.57 6.11 8 .0 9 8.58 6.93 7.16 2.16 0.81 0.103 0.081 4.48 4.17 Com ments Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell duplicate Production W ell Production W ell duplicate Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell duplicate Production W ell Production W ell Production W ell duplicate Production W ell Production W ell Production W ell Production W ell Production W ell Production W ell duplicate Test well Test well Test well T est well Test well T est well pH 7.19 7.68 6.97 7.30 8.03 \ 6.79 6.97 6.72 7.08 -- 7.74 7.61 -- 7.56 7.76 7.39 7.5 7.2 7.25 7.83 7.65 7.73 7.94 7.69 7.77 -- 7.44 7.04 7.4 7.39 7.26 7.40 7.52 7 .2 7.41 7.16 -- 7.87 7.41 7.62 7.03 7.42 7.13 4/17/03 Page 1 of 2 000461 LH samples Table 2 C-8 in Production and Test Wells Little Hocking Water Association Washingon County, Ohio Sam ple Name TW -4 TW -5 TW -6 TW -9 TW -10 TW -11 TW -12 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHTORCHBS BARTLETTCC 339B STA Sam ple Name LHPSDTW 4 LHPSDTW 4 LHPSDTW 4 LHPSDTW 4 LHPSDTW 4 LHPSDTW 4 LHPSDTW 5 LHPSDTW 6 LHPSDTW 6 LHPSDTW 6 LHPSDTW 9 LHPSDTW 9 LHPSDTW 10 LHPSDTW 10 LH PSDTW 11 LHPSDTW 11 LHPSDTW 12 LHPSDTW 12 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHTORCHBS BARTLETTCC 339B STA Sam ple Date 1/22/02 3/26/02 4/23/02 8/21/02 10/16/02 2/26/03 8/21/02 1/22/02 8/21/02 8/21/02 1/22/02 8/21/02 1/21/02 8/21/02 1/21/02 8 /2 1 /0 2 1/21/02 8/21/02 1/22/02 3/26/02 4/23/02 10/16/02 2/26/03 1/22/02 1/22/02 1/22/02 C-8 ug/l 37.1 33.3 28.7 12.3 14.5 22.5 6.26 1.79 1.15 1.23 0.364 0.812 1.9 1.1 1.41 1.73 0.758 0.824 1.69 2.62 1.93 4.29 2.33 1.85 1.94 1.81 Com ments T est well Test well Test well T est well Test well Test well Test well T est well T est well duplicate Test well T est well T est well Test well Test well T est well Test well T est well Finished W ater Finished W ater Finished W ater Finished W ater Finished W ater Booster Station Sam ple Booster Station Sam ple Booster Station Sam ple pH 12.61 12.26 12.35 11.32 9.22 10.54 6.7 7.03 6.81 6.81 7.33 7.09 7.43 6.85 7.38 7.07 7.39 6 .9 Shaded cells indicate groundwater sampled for the Little Hocking Sampling Investigation in August 2002. 4/17/03 Page 2 of 2 000462 LH samples Table 3 Groundwater Elevation Data for Production and Test Wells August 2002 Little Hocking Water Association Washington County, Ohio W ell ID Well #1 Well #2 Well #3 Well #5 TW-1 TW-2 TW-3 TW-4 TW-5 TW-6 TW-9 TW-10 TW-11 TW-12 Ohio River Surveyed Elevation* 613.47 613.71 613.54 613.18 598.13 599.92 599.75 598.52 608.28 598.7 598.53 595.83 603.79 602.22 584.7 Depth to W ater (8/21/02) 56.88 42.88 39.68 35.62 17.38 18.63 22.78 18.16 30.63 19.03 21.44 17.77 26.57 23.95 G ro u n d w ater Elevation (feet NISL) 556.59 570.83 573.86 577.56 580.75 581.29 576.97 580.36 577.65 579.67 577.09 578.06 577.22 578.27 2.46 582.24 ` Elevations were surveyed by Bob Griffin of LHWA on 8/23/02 using 610.0 as reference assumption for PW-1 well house top of floor slab. 4/17/03 Page 1 of 1 000463 LH samples Table 4 C-8 in Soil from Temporary Borings Little Hocking Water Association Washington County, Ohio Sariribl Name W U MF** WWO-S- LHWASW1 (,3-,9) WWO-S- LHWASW1 (5.0-5.6) WWO-S- LHWASW1 (11.2-11.7) WWO-S- LHWASW1 (15.5-16.0) WWO-S- LHWASW1 (22.1-22.6) WWO-S- LHWASW1 (26.5-27.0) WWO-S- LHWASW1 (30.0-30.5) WWO-S- LHWASW1 (30.5-31.0) WWO-S- LHWASW1 (37.0-37.5) WWO-S- LHWASW1 (37.5-38.0) WWO-S- LHWASW1 (44.3-44.5) WWO-S- LHWASW1 (47.5-48.0) WWO-S- LHWASW1 (53.5-54.0) WWO-S- LHWASW1 (53.5-54.0)-2 WWO-S- LHWASW1 (55.5-56.0) WWO-S- LHWANW1 (0.1-0.5) WWO-S- LHWANW1 (5.0-5.5) WWO-S- LHWANW1 (10.0-10.5) WWO-S- LHWANW1 (15.0-15.5) WWO-S- LHWANW1 (20.0-20.5) WWO-S- LHWANW1 (21.0-21.5) WWO-S- LHWANW1 (25.0-25.5) SampleiQte ` 8/23/02 8/23/02 8/23/02 8/23/02 8/23/02 8/23/02 8/23/02 8/23/02 8/26/02 8/26/02 8/26/02 8/26/02 8/28/02 8/28/02 8/28/02 8/29/02 8/29/02 8/29/02 8/29/02 8/29/02 8/29/02 8/29/02 'r.y ^ C -8 ug/kg 170 13 3.4 3.3 NQ ND(0.18) ND(0.18) ND(0.19) NQ ND(0.19) NQ ND(0.18) ND(0.18) ND(0.17) ND(0.17) 110 6.1 7.5 6.9 17 18 8.4 Comments s surface soil every 5 ft soil sample every 5 ft soil sample every 5 ft soil sample every 5 ft soil sample every 5 ft soil sample geologic interface geologic interface lithology change lithology change every 5 ft soil sample, charcoal layer every 5 ft soil sample every 5 ft soil sample every 5 ft soil sample, duplicate every 5 ft soil sample surface soil every 5 ft soil sample every 5 ft soil sample every 5 ft soil sample geologic interface geologic interface every 5 ft soil sample ND = not detected at the listed method detection limit (MDL). NQ = detected at a level between the MDL and the reporting limit (RL); result is not quantifiable. ND<MDL<NQ<RL RL = limit of quantitation (LOQ) adjusted for actual sample weight and % moisture, nominal LOQ = 2 ug/kg. 000464 4/17/03 Page 1 of 1 LH samples FIGURES 000465 000466 +TV-5 6.22 TV-6 1.79 TV-04 + 37.10 U WELL #3 0.744 TV-1 + 2.16 TV-11 TV-12 0.758 OVA\0 LEGEND: WATER SUPPLY WELL + TEST WELL 1.79 C--8 RESULTS IN UG/L SCALE 200 200' 000468 C orporato Rom odatlon Group i n Attim o* b*tw**n DuPont and UltS Diamond Barley Mill Plaza, Building 2 7 ___________ Wilmington. Delaware 19805 C--8 IN GROUNDWATER JANUARY, 2002 Little Hocking Water Association Little Hocking, Ohio SCALE Am 5hown -------------4 /1 2 /0 2 CHECKED TDL -- DEL APPROVED * CM) FEE NO* 7423A002 000469 ILLUSTRATIONS TAKEN FROM SIMARD, 1989. BOBS QMM ML UPS w nosnoo MMS < o m t> ^ Corporata R a m a d a t k x i Group A n AUfane between D uPont and HRS D iam ond IDEALIZED OHIO RIVER V A LLE Y CROSS-SECTION AND BLOCK DIAGRAM D u P o n t W a s h in g to n W o rks W a s h in g to n , W e st V irg in io BMOKSCCONSTHUCnOM} B arley M ill Plaza, B uilding 27 W Hmsigton, Delaware 19805 Hat ta Sotfa | 12/t/Ot j Rpaa 4 j 4. (TSH \ m ) N O UYAJQ North A PLEISTOCENE TERRACE ___ _____ A_________ HOLOCENE FLOODPLAIN ( 'l___________________A___________________ BEDRO CK (DUNKARD G RO UP) South A* HOLOCENE FLOODPLAIN r^i r PLEISTOCENE TERRACE _______________________ A _______________________ DUPO N T W A SHING TO N W ORKS W E S T VIRG INIA RBLMW-9 BGMW-2 TW"22 BD-22 T Y14-MW02 BEDROCK (DUNKARD GROUP) 000470 > + WELL #1 (1 .7 2 -3 .65 ) T V -5 (6 .2 6 )-# WELL | 5 (5.69-B .58) T V -9 + (0 .8 1 2-0 .3 6 4 ) T V -3 (4 .1 ^ .4 8 ) LHWANW--1 A (6 .22-34.6) LH W A W -2 LHWANE--1 (0.6 6 2 -5.5 8 )X U LH W A N -1 X (50.8) LHWANE--2 X (1.28) T V -6 <3 3 5 > y TV -04 # (1 2 .3 -3 7 .1 ) (1 .2 3 -1 .79 ) 2V LHWASW--1 (0 .0 9 12 -1 .3 2 ) LH W A E -1 ,X (0 .4 1 6 ) LHWAW-1 ND , WELL #2 (2 .0 3 -4 .2 6 ) .WELL #3 (0.42 -0 .95 2 ) T V -1 0 JV -11 1 (1 .4 1 -1 .7 3 ) T V -1 2 (0 .7 5 8 -0 .8 2 4 ) LEGEND: WATER SUPPLY WELL TEST WELL A BORING - SOIL & GROUNDWATER SAMPLES X BORING - GROUNDWATER SAMPLES SCALE 200 200' NOTE: LOCATIONS OF WELLS AND BORINGS ARE APPROXIMATE. ND = <0.01 u g /L 000472 iilliiXli Corporate Rsmsdatkxi Group i n ilK o n n tetween DuPont and VPS Diamond _____ Barley Mill Plaza. Building 2 7 Wilmington, Delaware 19805 C --8 CONCENTRATION RANGES IN GROUNDWATER L ittle H o ckin g W a te r A s s o c ia tio n L ittle H o c k in g , O hio sere DCMNED As Shown 5 B I------------ CHECKED 4 /1 2 /0 2 TDL M mm CAORLE NO. jf&mDEL 7423A006 s------- noons 7 NORTH A SOUTH A' o ELEVATION (FEET MSL) *< & 4 _ 2 __ SCREENED INTERVAL IN TEST WELL OR PRODUCTION WELL AW ) C -fl CONCENTRATION IN GROUNDWATER (N O -<0.01 ug/L) GROUND WATER SAMPLE LOCATION IN GE0PR06E OR ROTOSOMC BORING AND C -8 CONCENTRATION IN GROUNDWATER (N D -<0.01 ugA) SOIL SAMPLE LOCATION IN GEOPROBE OR ROTOSONiC BORING AND C -8 CONCENTRATION IN SOIL (NO-NON DETECT AT STATED REPORTING UMIT) GROUNDWATER ELEVATION H o riz o n ta l S c a le : 1 " = 6 0 ' V e rtic a l S c a le : 1" = 1 0 ' Corporate Remedtatlon Group A t iita n t* beheae* PuPvnt and OKS Piomond CROSS-SECTION A -A ' L ittle H o ckin g W a te r A s s o c ia tio n L ittle H o ckin g , O hio tHmin^ton, Mawor 19880-0027 * " | w/aa/iOM |~WJ0C007 P "*" 11 NORTH B SOUTH B' ELEVATION (FEET MSL) LEGEND: SCREENED INTERVAL IN TEST WELL OR < 4 * ujA ) PRODUCTION WELL AND C -8 CONCENTRATION IN GROUNDWATER (N D -<0.01 ugA) ESTIMATED SCREENED INTERVAL IN TEST WELL (0952 ft|AJ OR PRODUCTION WELL AND C -8 CONCENTRATION ? IN GROUNDWATER (N D -<O .Cfl ugA) V - GROUNDWATER ELEVATION Horizontal Scale: 1" - 60' Vertical Scale: 1" - 10' < g rw w t> ^ CorporDautFiet**n*IRIaInmdinimVU<tStftDloaiartmnloonndGrotq) WBminfton.Ddoww*19680-0027 CROSS-SECTION B - B ' L ittle H o ckin g W a te r A s s o c ia tio n L ittle H o c k in g . O hio toSwm|v / 3* /m a |wnw 12 West c East c oo LEGEND: SCREENED INTERVAL IN TEST VLL OR (12J b|A ) pro o uctw n WELL AND C -8 co ncentratio n IN GROUNDWATER (ND--CO.Q1 u g A ) " ESTIMATED SCREENED INTERVAL IN TEST WELL (L73gA) OR PRODUCTION WELL AND C -8 CONCENTRATION ? IN GROUNDWATER (NO--<0.01 ugA) GROUND WATER SAMPLE LOCATION IN GEOPROBE OR ROTOSONIC BORING AND C -8 CONCENTRATION IN GROUNDWATER (ND-<Q .01 u g A ) GROUNDWATER ELEVATION H o rz o n to l S c o le : 1 " 6 0 ' V e rtic o l S c o le : 1 * = 1 0 ' H ID ^ CorporDautPeonnMlRvHaiadnmcUoKafScdaDtawiaatmaliooinnd Group Mmington, Mow# 19680-0027 CROSS-SECTION C -C ' Little H ocking W ater A ssociation U ttle H ocking. Ohio h thorn 1ca/m/xas\ MKteet | 13 APPENDIX A APPENDIX A C-8 ANALYTICAL REPORTING 000480 C-8 Analysis of Water In October 2001, a new analytical method for analysis of C-8 in water was developed and tested by Exygen Research, Inc. (Exygen; located in State College, PA). This laboratory utilizes Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS). DuPont adopted the regular use of LC/MS/MS for C-8 analysis in water in November 2001 and Exygen continues to perform the water analyses for DuPont. Exygen reports C-8 results for the laboratory replicate of each field sample. These results are evaluated for precision by comparing the field sample result to the corresponding laboratory replicate result. If both results are less than the practical quantitation limit (PQL), the replicate sample for that analyte is considered to have passed the precision criteria. If one or both results are between one and five times the PQL, the replicate is considered to have met the precision criteria if the two results differ by less than the PQL. If one result is less than the PQL and the other is not, and if the two results differed by a value less than the PQL, the replicate is said to have met the acceptance criteria. If both results are at least five times the PQL, the replicate is considered to have met the criteria if the relative percent difference (RPD) between the two results is less than or equal to 20%. The RPD is the absolute value of the difference of two measurements divided by their average. When the precision criteria outlined above are met, Exygen reports the average of the field sample and laboratory replicate results reported by the laboratory. If criteria for precision are exceeded, Exygen reports the higher of the sample and lab replicate results. Finally, when one result (from the sample/lab replicate pair) is above the PQL and one below, the result that is above the PQLs is reported. C-8 results are recorded in the Corporate Environmental Database (CED) and are reported as FC-143 for consistency with historical results. An aliquot of each field sample is also analyzed as a matrix spike (MS). Results of the MS analysis are used to assess accuracy. The MS recovery value must fall between 70 to 130%, unless the sample concentration is at least four times the amount spiked. The maximum amount used to spike field samples is 500 ug/L. All data packages generated by Exygen are reviewed in-house for compliance with the laboratory Standard Operating Procedures (SOP) and data usability, using the checklist provided in the Quality Assurance Project Plan (DuPont 2002a). Results of the in-house review indicate that data reported by Exygen have been generated in compliance with the laboratory SOP, with few exceptions as noted in the individual review summaries. All data reported by Exygen have been judged usable for the purposes of the project. A subset of the data packages generated by Exygen have been submitted to Environmental Standards, Inc (ESI) in Valley Forge, Pennsylvania, for an independent (i.e., third-party) quality assurance review. Results of the quality assurance review will be provided when available. 0004S1 Appendix A Page 1 C-8 Analysis of Soil The laboratory performing analysis of soil samples and associated field blanks is Sevem-Trent Laboratories, Inc., Arvada, Colorado (STL-Denver). STL-Denver analyzes samples for C-8 according to a laboratory standard operating procedure (SOP), DEN-LC-0012A. Each sample is tested unspiked, in duplicate (lab replicate), and spiked with C-8, using LC/MS/MS. STL-Denver reports C-8 results for the laboratory replicate of each sample. These results are evaluated for precision by comparing the sample result to the corresponding laboratory replicate result. If both results are less than the practical quantitation limit (PQL), the replicate sample for that analyte is considered to have passed the precision criteria. If one or both results are between one and five times the PQL, the replicate is considered to have met the precision criteria if the two results differ by less than the PQL. If one result is less than the PQL and the other is not, and if the two results differed by a value less than the PQL, the replicate is said to have met the acceptance criteria. If both results are at least five times the PQL, the replicate is considered to have met the criteria if the relative percent difference (RPD) between the two results is less than or equal to 20%. The RPD is the absolute value of the difference of two measurements divided by their average. When the precision criteria outlined above are met, STL-Denver reports the average of the sample and lab replicate results. If criteria for precision are exceeded, STL-Denver reports the higher of the sample and lab replicate results. Finally, when one result (from the sample/lab replicate pair) is above the PQL and one below, the result that is above the PQL is reported. C-8 results are currently recorded in DuPont's Corporate Environmental Database (CED) and are reported as FC-143 for consistency with historical results. An aliquot of each field sample is also analyzed as a matrix spike (MS). Results of the MS analysis are used to assess accuracy. The MS recovery value should fall between 70 to 130%, unless the sample concentration is significantly higher than the amount spiked. All data packages generated by STL-Denver are reviewed in-house for compliance with the laboratory Standard Operating Procedures (SOP) and data usability. Results of the in-house review indicate that data reported by STL-Denver have been generated in compliance with the laboratory SOP. All data reported by STL-Denver have been judged usable for the purposes of the project. A subset of the data packages generated by STL-Denver have been submitted to Environmental Standards, Inc (ESI) in Valley Forge, Pennsylvania, for an independent (i.e., third-party) quality assurance review. Results of the quality assurance review will be provided when available. Appendix A 0004S2 Page 2 APPENDIX B 000483 APPENDIX B GEOLOGIC LOGS FOR LITTLE HOCKING WATER ASSOCIATION WELL FIELD TEMPORARY BORINGS 0004S4 ID C DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 LHWA-N1 (page 1of 1) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 29, 2002 : August 29, 2002 : Geoprobe : Continuous : Bowser Morner : John Rlstow Northing (WV St PI)* Easting Coord * Surface Elevation** 597.69' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00'. 0) 0) LL C Surf. i Elev. & 597.69 Q 0- - 597 O X aa. DESCRIPTION Brown silty T O P S O IL . S IL T Y C LA Y , top few inches is gray w /o mottles. B ecom es brown with lots o f orange, gray and dark brown mottles. Dry and crumbly. Sam ple -0s9* 00 5- 592 10- - 587 15- 582 20- - 577 Light brown S IL T Y C LA Y, with gray m ottles (fracture surfaces?) and som e rare orange mottles, hard, semi-plastic sos No mottles, few pebbles. 2" very dark brown S IL T Y C LA Y, m ottles are BLA C K after which there are no mottles. Brow n S IL T Y C LA Y, rare fine to very fine sand, sticky. Rolls into coarse logs. 100% Like above, soft. R are sand and pebbles, Sandstone clasts at 15.2 and 15.9'. Moist, not mottles. ? 154% 121 Brown S A N D Y /S IL T Y C L A Y to C L A Y E Y S IL T Y S A N D , very moist a t 17', Pebbles at 17.3'. Brown fine S A N D , minor silt and clay, w et. Interbedded with moist S IL T Y C L A Y to 20'. W L m easured 1 hour after setting well point. C la y e y S IL T Y S A N D , w et to m oist, brown, fe w p eb b les, cob ble a t 18". B ottom is fine sand with little silt and no d a y (2 1 .6 -2 2 '.) 5ooCMs -p CCOO ocT?oj* T D at 22'. 25572 000485 30- DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 LHWA-NE1 (page1of2) Date Started Date Completed Drilling Method Sampling Method Company Logged By August 20, 2002 August 20, 2002 Geoprobe Continuous Bowser Morner Steve Opp Northing (WV St PI)* Easting Coord.** Surface Elevation** Sample prefix 597.85' LHWANE * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00'. O) <D LL C Surf. Elev. & 597.85 Q 0- - 597 O X cc o DESCRIPTION Brown silty T O P S O IL , som e organics, dry. By .2' h ave tannish brown C L A Y E Y S IL T, m icaceous, little organics, som e o rang e mottling, dry. R ed d ish brown S IL T Y C L A Y , dry, m icaceo u s, o ra n g e and g ra y m ottling. M oisture in sam ple by -7 .5 '. Increased clay with depth. 592 Sam ple IQ 587 15- 582 20- 577 25572 30- Brow n S IL T Y C LA Y , m icaceous, som e fine to m edium sand, moist to wet, trace fine to m edium gravel to -1 0 .5 ' depth, well rounded. C ontinued Brown S IL T Y C L A Y with som e sand, moist to w et, m icaceous. T race fine gravel to -1 9 .5 '. - 0 . 5 ' thick z o n e o f S IL T Y S A N D w / little fin e to m e d iu m gravel. M oist to w et. B elow is - 2 .5 ' brown S IL T Y C LA Y with som e fine to m edium S A N D , moist to w et, m icaceous. G W elevation when G W sam ple collected (21-27). Brown fine to m edium S A N D with little clay and little silt, becom es wet, dark brown to black stained zones at 2 2 .7 and 23.1'. Z o n es are - 1 " thick Brown fine to m edium S A N D , with trace fine gravel, little silt and clay, m icaceous, wet. G rad es to a brownish to tannish brown fine to coarse S A N D , with som e fine to m edium well rounded gravel at base of sam ple [-3 0 '], w et micaceous. O004S6 GW SAMP DuPont C orporate Rem ediation Group W ashington W orks Consent O rder Little Hocking Investigation P roject# 18983762 LHWA-NE1 (page 2 of 2) Date Started Date Completed Drilling Method Sampling Method Company Logged By August 20, 2002 August 20, 2002 Geoprobe Continuous Bowser Morner Steve Opp Northing (WV St PI)* Easting Coord.** Surface Elevation** Sample prefix 597.85' LHWANE * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00'. : 00]) LL Surf. Elev. Q(DQ . 597.85 30- -567 O X k S DESCRIPTION Tannish brown silty fine to coarse S A N D with som e fine to m edium well rounded gravel, w et, m icaceous. Poor recovery 3 0 -4 0 ' interval. ,*." 7 . 7 7 .07>; . .o ; ; ; 7 .7 7 ; 35- ' V "o7 562 / i v : " 7 " o'* i*,V ,V ,. i-. ;V.-a.; ;V.0. -d. 40557 >7.o7 7777 77 77 ^ d '- , .d ' i .d >7 . o ; . .or; ; : yyyyyy. 7*777 S a m e as above with angular gravel 45552 50547 7*77 *7To-*,a: 7777 t*!v?7; *.v "0 i - d . ' W d. o-; . . o \ .r'",,r " 7o77.` 777C Brown to dark brown silty fine to coarse S A N D w / som e fine to coarse gravel, m icaceous, wet. 7V7*! 55.-5 4 2 G reenish gray com petent S IL T S T O N E breccia, m icaceous, dry. (D epth estim ated based on m easured thickness of overlying seds, not versus total recovery). T D @ 6 0 '. Sam ple 000487 60- DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 LHWA-NE2 (page 1of 1) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 29, 2002 : August 29, 2002 : Geoprobe : Continuous : Bowser Morner : John Ristow Northing (WV St PI)* Easting Coord.* Surface Elevation** 596.64' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00'. 0cu) u. QQ<U. 596 5- 591 10- - 586 DESCRIPTION Brown, silty clay T O P S O IL , dry, crumbly. G ray S IL T Y C LA Y, hard, dry, crumbly, few mottles. H e a v y o range mottles, som e reds, few black. G ray/brow n overall color. M ottles and fracture coating a re black, red and orange. Lighter oranges with depth. 8" long parting with orange coating. Brow n S IL T Y C L A Y turning to olive brown clay and S IL T Y C L A Y . S em i- plastic, m oderately stiff to plastic. Sam ple 15- 581 20- 576 Brown S IL T Y /S A N D Y C LA Y, d ark brown m ottles, sem i-plastic to plastic, moist. R a re p eb bles, sand is fine to v e ry fine, s o m e d ark brown to black m ottles, plastic, m o is t. G W level m easured - 1 2 hours after well installation. Brown S IL T Y /S A N D Y C LA Y- Increased sand, few pebbles + cobbles of sandstone at 19'. Moist. 25571 30- M edium SA N D , few pebbles, wet. (Poor recovery-depth estim ated). T D at 25.7'. W ell set (3/4" PV C ). GW SAMP 000488 DuPont Corporate Rem ediation Group W ashington W orks C onsent Order Little Hocking Investigation Project# 18983762 LHWA-E1 (page1of 1) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 29, 2002 : August 29, 2002 : Geoprobe : Continuous : Bowser Morner : John Ristow Northing (WV St PI)* Easting Coord.' Surface Elevation** 596.39' * See Figure 6 tor approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' aa)) Surf. Elev. <0Q - 596.39 a - 596 - 591 DESCRIPTION Light brown silty T O P S O IL . Dry. G ra y S IL T Y C L A Y , T o p 10" has fe w m ottles (C h orizon), H ard , dry. B elo w is brow n/gray S IL T Y C L A Y with lots o f o rang e m ottles, fe w brown mottles, dry, crumbly. Light brown S IL T Y C L A Y with strong red and orange mottles and coatings on fracture surfaces. S o m e black mottles, sem i-plastic to crumbly. Sam ple 10- - 586 O live brown S IL T Y C L A Y with gray mottles and gray-coated fractures. No moist fractures. Sem i-plastic 15- 581 20- - 576 25- 571 30- S IL T Y T O S A N D Y C LA Y , plastic, sticky, soft, brown with g reen tinge, som e gray mottles, sandy zo nes m ore moist. S-6" Silty fin e S A N D , brown, w et, sloppy. '-Brow n S A N D Y /S IL T Y C LA Y, gray and o range mottles, plastic, sticky. Brown gray S IL T Y /A N D Y CLA Y, plastic, moist. S A N D Y C LA Y, sticky, wet. Thinly interbedded (-2 -5 " ) F IN E S A N D + /- silt and S IL T Y /S A N D Y C LA Y. S A N D Is w et. Bottom 1/3 is S A N D Y B R O W N C L A Y , sticky, plastic. T D @ 2 6 '. W e ll set (3/4 " P V C ) 000489 HRS DuPont C orporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 LHWA-S1 (page 1 of 1) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 27, 2002 : August 27, 2002 : Geoprobe : Continuous : Bowser Morner : John Ristow Northing (WV St PI)* Easting Coord.* Surface Elevation** : : 596.46' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' : (tDu u. Surf. o<D. D - 596 DESCRIPTION Brown silty T O P S O IL , dry, minor roots, crumbly. B row n /g ray S IL T Y C L A Y , hard, stiff, com petent, o ra n g e m ottles. Becom es light brown with depth. M ixed orange and gray mottles. Sam ple - 591 10- 586 15- 581 20576 25- 571 30- G ra y m ottles h a v e m oisture inside (old roo tlettes?) C la y is stiff b ut sem i-plastic. V ery hard drilling, light brown S IL T Y C LA Y, sam e as above. W a te r level m easured 1.5 hours after drilling ceased. Brown S IL T Y C L A Y , gray m ottles, ra re d ark brown m ottles, m oist, very plastic, can roll into ropes. M ica is present, not noted ab o v e . S A N D Y /S IL T Y C L A Y , Brown, m oist, fine to v e ry fine sand grains, clay is becom ing sticky. '-S A N D Y C LA Y a re soft, and very moist (not wet). F ew dark brown/black mottles. S a n d y z o n e z o n e in S A N D Y C L A Y , 5" thick, v e ry m oist, no odors. Light brown S IL T Y C LA Y , m inor fine sand, moist, sticky, w et sand stringer at -2 4 '. C lay becom es interbedded (.5 -1 ' thick) S IL T Y C LA Y S A N D S A N D Y C L A Y S . Silty clay is light brown and soft, S a n d y clays a re v e ry m oist a n d light brown. R E D R IL L - Interbedded brown C L A Y and fine S A N D S (dropped sam ple) GW sample R e d /o ra n g e C L A Y , layered , w / g ra y clay (?). M oist, stiff. 000490 UMS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project# 18983762 LHWA-S2 (page 1 of 1) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 26, 2002 : August 26,2002 : Geoprobe : Continuous : Bowser Morner . John Ristow Northing (WV St PI)* Easting Coord.* Surface Elevation** : : 598.76' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' : <1) <D U. C Surf. Q. OCD 0- - 598 - 593 10- 588 15583 20- 578 25- 573 30- DESCRIPTION Brown S IL TY CLAY w/ lesser C LA YEY SILT. 0-3' - Dry, Sandstone fragm ents at 23", roots, crumbly. S c0oor) Sam ple Brown S IL T Y C LA Y with gray, moist, sem i-plastic, roots, rare o range mottles. S IL T Y C LA Y, rare dk brn and g ray mottles. Sem i-plastic to crumbly, m ore clayey and sem i plastic a t b ase, stiff. T o p 12' dry. Brown S IL T Y C L A Y (m o re clay). S em i-p lastic to plastic, m ore moist a t base, rolls to string in hand a t b ase, m inor m ica, g ra y a n d ra re d k brown m ottles- g ra y a p p e a r to be old root sections and moister. Brown S IL T Y C L A Y like a b o v e . W e t spo ts in g ra y m ottles. N ot a s stiff. Slightly soft. W a ter level m easured next morning. Brown S IL T Y /S A N D Y C LA Y, moist, sticky, soft, minor mica and coal(?) fragm ents, so m e g ra y mottling, m oister or w e t alon g m ottles. S an d is fine to v e ry fine grained. Brown S A N D Y C LA Y, very moist but not wet. S o m e black spots of High organic(?) content, no odor, very soft and plastic. Brown S IL T Y C L A Y -4" at -2 2 ', soft, moist. v Brown S A N D Y CLAY, dark brown mottles, very soft, sam e as above. Brown V E R Y S A N D Y C LA Y, W E T w / lesser moist, S IL T Y C LA Y. Brown S IL T Y S A N D with minor clay, w et, m inor mica. ySILTY S A N D Y C LA Y, moist not w et, brown. Drilled to 30' to try to get w ater sam ple. Problem s collecting sam ple. W a te r level -2 4 .3 ' B G S a fte r drilling to 30' (it d ro p p ed ). N o re c o v ery in this run. 000431 DuPont C orporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 18983762 LHWA-SW1 (page 1 o f 2) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 23, 2002 : August 28, 2002 : Geoprobe : Continuous : Bowser Morner : Steve Opp Northing (WV St PI)* Easting Coord.* Surface Elevation** 596.87' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' <D CD Surf. Elev. a. a> 596.87 O 0- - 596 DESCRIPTION D ark brown T O P S O IL , dry. By .2 ' have tannish brown C L A Y E Y SIL T, som e organics, dry. ^-Tannish brown S tL T Y C LA Y , with little organics, o rang e and grey mottling, dry. Sam ple (3-.9) - 591 T an nish brown S IL T Y C L A Y with o rang e and gray mottling, dry. (5-5.6) 10586 15581 20- 576 Brown S IL T Y C LA Y with som e gray mottling, dry to moist. (11.2-11.7) Tannish brown, sam e as above, dry to moist. Tannish brown to brown S IL T Y C LA Y, m icaceous, becom es moist, gray mottling. (15.5-16) 25571 30- Thin black-stained zone at 24.5'. Brown C L A Y E Y S IL T , gray mottling, moist to w et, m icaceous. Thin (2"), fine S A N D Y zo ne, w et at 29' followed by brown C L A Y E Y S IL T , m icaceous, variably wet. (26.5-27) / oa URS DuPont C orporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 18983762 LHWA-SW1 (page2of2) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 23, 2002 : August 28. 2002 : Geoprobe : Continuous : Bowser Morner : Steve Opp Northing (WV St PI)* Easting Coord.* Surface Elevation" : : 596.87' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' : <D <D UC Surf. i Elev. S' 596.87 Q 30- 566 O X cc o DESCRIPTION Brown C L A Y E Y S IL T, som e fine sand, wet, m icaceous, orange and gray mottling, fine sandy lens from 30.5-31'. Sam ple (30-30.5) (30.5-31) GW SAMP 35561 40- 556 *."o*."o* *.v : a` .a *. O'* Brown to gray S IL T Y C L A Y with little fine sand , w et. G rad es to silt with som e fine sand. T annish brown S IL T Y fine to m edium S A N D with som e fine to m edium gravel, little clay, W ET. Tannish brown fine to coarse S A N D with som e gine gravel, little silt, w et, charcoal seam at 0.7' from base of sam ple. (37-37.5) (37.5-38) GW SAMP 45551 T an n is h brown fine to m ed iu m S IL T Y S A N D with little fine to m ed iu m g ra v e l, w et, charcoal seam near bottom of interval. (44.3-44.5) 50- 546 ; . or ; i .r , . .<r; ; .a; ; . ' -V .er; ; . e ; ; . -O'; * ,r; -iV. P':'?-:'; F ine to m edium gravel (0.5') followed by tannish brown fine to coarse S IL T Y S A N D : with so m e fine to coarse gravel, wet. * '">* "o' / 55541 '.v .v ; * !" o'*!" o* ? Tannish brown fine to coarse grained S IL T Y S A N D with som e fine to coarse gravel, w e t. Yellowish brown to greenish gray w eath ered S H + S T bedrock, dry. TD A @ -5 7 '. (47.5-48) GW SAMP (53.5-54) (55.5-56) 000493 60- DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project# 18983762 LHWA-W1 (page 1 of 2) Date Started Date Completed Drilling Method Sampling Method Company Logged By August 28, 2002 August 29, 2002 Geoprobe Continuous Bowser Morner John Ristow Northing (WV St PI)* Easting Coord." Surface Elevation** 597.17' * See figure 6 for approximate location ** Elevation assumes top of Weil House #1 Floor Slab = 610.00' : <u <D Q. * a<D 597 tttV t % TtT DESCRIPTION Brown silty clay T O P S O IL . Dry, crumbly. G ray/Brow n S IL T Y C LA Y, few orange m ottles, hard and dry, Increased mottling below 1', Including orange and dark brown m ottles, som ew hat crumbly. Sam ple 5 - 592 10 - . 587 1 5 - - 582 Light brown S IL T Y C L A Y with gray mottles, sem i-plastic, stiff, crum bles into small balls w hen rolled. S o m e orange mottled, continued sem i-plastic, gray mottles appear to be rootlets. F ew g ray mottle cracks appear moist vs the dry clay, semi-plastic. N o m oisture in m ottles. V e ry stiff, hard to b reak. 20- - 577 2 5 - 572 30- Brown S IL T Y C LA Y , plastic, sticky, rare sand grains, fine to very fine sand, G ray and dark brown mottles. Possible desicration crack in this interval. Increased mica content. - .8 ' of S A N D Y S IL T Y C LA Y, f-vf sand, moist, not wet. G W level m easured 1 hour after drilling. S IL T Y /C L A Y E Y S A N D , w et to moist, light brown S IL T Y /S A N D Y C LA Y , light brown, moist, increased sand with depth, to -2 6 .3 '. W e t, sloppy S ILT with C LA Y (2"). ^ B ro w n S IL T Y C LA Y, rare sand, few mottles. ^ S A N D Y S IL T Y CLAY, Plastic, gray and orange mottles, som e mica. Small piece of coa Brown fine S A N D Y SILT, clayey, wet, sloppy O494 DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 LHWA-W1 (page2of2) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 28, 2002 : August 29, 2002 : Geoprobe : Continuous : Bowser Morner : John Ristow Northing (WV St PI)* Easting Coord.* Surface Elevation" : 597.17' * See figure 6 for approximate location " Elevation assumes top of Well House #1 Floor Slab = 610.00' : Surf. Elev. QQ<1>. 597.17 3 0 - . 567 O X k a DESCRIPTION S A N D Y /S IL T Y C L A Y , brown, m oist, plastic. M u d d y S IL T in bottom 2" 3 5 - 562 V e ry fine to m edium -fine S A N D , minor silt and clay, wet. S IL T Y C L A Y , m inor sand , stiff, moist. F in e S IL T , m uddy, wet, brown, underlain by 5" of moist, S IL T Y S A N D Y C LA Y, moist. \ T D @ 34'. W e ll point s e t here.____________ Sam ple 4 0 - . 557 4 5 - - 552 5 0 - 547 5 5 - - 542 60- 000495 URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 LHWA-W2 (page1of2) Date Started Date Completed Drilling Method Sampling Method Company Logged By August 28, 2002 August 28, 2002 Geoprobe Continuous Bowser Morner John Ristow Northing (WV St PI)* Easting Coord.* Surface Elevation** 597.20' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' ai LcCLD Q. oCD 597 5 - . 592 DESCRIPTION \Brow n silty T O P S O IL , dry, m inor roots, crumbly. vLight brown silty clay T O P S O IL , dry, crumbly. G ray S IL T Y C L A Y , dry, crumbly, no m ottles in upper .5'. B ecom es B row /gray with o rang e m ottles below this, stiff, hard. C rum bles to small balls when rolled. Light brown S IL T Y C LA Y , g ray m ottles, sem i-plastic, Dry, minor dark brown mottles. Sam ple 1 0 -- . 587 Still no m oisture noted. S IL T Y C L A Y is a little softer, little m o re m oisture, dry. 1 5 - 582 2 0 - , 577 2 5 - - 572 30- M easured G W 15 m inutes after drilling, elevation not stable (rising) G ra y m ottles sho w s o m e m oisture, fe w d ark brown m ottles, clay is now a b le to b e rolled into thin ropes betw een hands, S o m e m ica below this point. R a re sand , m oist, plastic, sa n d is fin e to v e ry fine. S e d im e n ts a re soft. S A N D Y C L A Y /C L A Y E Y S A N D , v e ry m oist, light brown color, m in or m ica._____________ Brown S IL T Y CLAY, minor SA N D . Brown S A N D Y S IL T Y C L A Y LA Y E R (6" thick) V e ry ponounced gray rootey channel -1 0 " long, w et inside, very soft and plastic d a y . R olls very thin. S A N D Y C LA Y to C L A Y E Y S A N D , light brown, fine sand, w et seam s at -2 7 .5 ' and 2 9 .2 ' (< = 3") 000496 UBS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 LHWA-W2 (page 2 of 2) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 28, 2002 : August 28, 2002 : Geoprobe : Continuous : Bowser Morner : John Rlstow Northing (WV St PI)* : Easting Coord.* Surface Elevation** : 597.20' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' <<uu Surf. O 20) X Elev. * a> 0) 597.20 tr CD D C3 3 0 - - 567 DESCRIPTION Brown S IL T Y C L A Y E Y S A N D , very sloppy, w et. S o m e gray coloring. ^Sticky, mica. Brown and G ray S IL T Y C LA Y, increased sand content with depth, moist. 0>) 8 cc(D S am p le 5? CM >3% 179% 3 5 - - 562 G ray S A N D Y C LA Y to C L A Y E Y sand with a fe w small pebbles, wet, for .8' becom ing G ray sand and sm all gravel, clean, w et, Bottom 1' S IL T Y S A N D and G R A V E L mix. T D @ 38'. GW SAMP 200% 4 0 - - 557 4 5 - - 552 5 0 - 547 5 5 - - 542 60- 000497 URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 LHWA-NW1 (page 1 of 1) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 28, 2002 : August 29, 2002 : Geoprobe : Continuous : Bowser Morner : Steve Opp Northing (WV St PI)- ; Easting Coord.' Surface Elevation-- : 598.01 Sample prefix :LHWANW1 * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00'. Surf. Elev. QCL CD 598.01 598 U I kooc DESCRIPTION Stiff, tannish brown topsoil. S om e organics, dry. G rades quickly into tannish brown C L A Y E Y S IL T with som e organics, dry, orange and gray mottling. Sam ple (0.1-0.5) 5 - - 593 Brown C L A Y E Y S IL T /S IL T Y C LA Y, m icaceous, o rang e and gray m ottles, dry. (5-5.5) 10- 588 1 5 - - 583 2 0 - - 578 2 5 - 573 30- Brown S IL T Y C L A Y w / little fine to m edium gravel and little fine sand, becom es moist, m icaceou s. (10-10.5) Brown S IL T Y C L A Y with trace fine to m edium gravel and som e fine to m edium sand. Increasing sand content and coarsening toward base of sam ple (19'). (15-15.5) S a m e a s ab o v e with silt lens at 21'. Brown fine S IL T Y S A N D with som e clay, w et, grades to tannish brown fine to m edium S A N D with som e silt, and trace clay, wet. Tannish brown fne to m edium S IL T Y SA N D , wet. (20-20.5) GW SAMP (25-25.5) GW SAMP T D @ 29'. 4J Q 0 4 9 8 APPENDIX C APPENDIX C GEOLOGIC LOGS FOR PRODUCTION AND TEST WELLS (PROVIDED BY LITTLE HOCKING) 000300 W ell Log and Drilling Report Page 1 of 1 I . 'A ' " j Water W ell Log and Drilling Report Ohio Department o f Natural Resources Division o f Water Phone: 614-265-6740 email: cleve.brown@dnr.state.oh.us Water Home: http://www.dnr.state.oh.us/water WELL LOG AND DRILLING REPORT 1Log Number: 389539 RIGINAL OWNER AND LOCATION r'-inai Owner Name: LITTLE HOCKING WATER Lot Number: i nty: WASHINGTON Township: BELPRE Section Number: ddress: State: OH Zip Code: / ation Number: 42 Location Map Y ean 1981 Location Area: INSTRUCTION d e t a il s ? -ehoie Diameter: lasing Diam eten 10 in. 7' 11Use: ! uifer Type: Total Depth: 50ft. Depth to Bedrock: Casing Thickness: Casing Length: 51ft. Screen Length: Date o f Com pletion: 11/28/70 Driller's Name: G M BAKER & SON !| ELL TEST DETAILS L .stic W ater Level: 10ft. .wdown: 25ft. Test Rate: 250gpm Associated Reports Test Duration: 40 hrs. NONE WELL LOG ^p m aiion s. \N D & CLAY SAND & CLAY rRAVEL/SAND/CLAY ,,AND & GRAVEL From I d 0 - 22 22 -3 6 36 - 40 40 -5 0 000501 | http://w w w .dnr.state.oh.us/w ater/m aptechs/w ellogs/app/w ell_log_report.asp?cnty=W A SH IN G T O N & w ln=... 1/17/2002 ater W ell L og and D rilling Report r Page 1 of 1 1 ' Water Well Log and Drilling Report Ohio Department of Natural Resources Division of Water Phone: 614-265-6740 email: cleve.brown@dnr.state.oh.us Water Home: http://www.dnr.state.oh.us/water I Well Log Number: 389538 WELL LOG AND DRILLING REPORT | ORIGINAL OWNER AND LOCATION Original O wner Name: LITTLE HOCKING WATER Lot Number: , m County: WASHINGTON Township: BELPRE Section Number: I Address: City: Location Num ber: 42 State: OH Zip Code: Location Map Y ean 1981 Location Area: I CONSTRUCTION DETAILS Borehole Diameter: I Casing Diameter: 12 in. W ell Use: Aquifer Type: I Total Depth: 60ft. Depth to Bedrock: Casing Thickness: Casing Length: 51 ft. Screen Length: Date o f Com pletion: 11/28/70 Driller's Name: GM. BAKER & SON WELL TEST DETAILS | Static W ater Level: 16ft. Test Rate: 400 gpm Associated Reports TM .wdown: 20ft. Test Duration: 24 hrs. NONE | WELL LOG Formations SAND & CLAY I SAND SAND & GRAVEL I From I fi 0 - 27 27 - 31 31 - 60 I 1 1 I r - 000S02 r * ://\vw w .dnr.state.oh.us/w ater/m aptechs/w eIlogs/app/w ell_log_report.asp?cnty=W A SH IN G TO N & w ln=... 1/17/2C I iVater W ell L og and Drilling Report Page 1 o f 1 V j e L L - ft 3 Water W ell Log and Drilling Report Ohio Department o f Natural Resources Division o f Water Phone: 614-265-6740 email: cleve.brown@.dnr.state.oh.us Water Home: http://www.dnr.state.oh.us/water Lj W ell Log Number: 450860 WELL LOG AND DRILLING REPORT [^ORIGINAL OWNER AND LOCATION O riginal Owner Name: LITTLE HOCKING WATER Lot N um ber , (County: WASHINGTON LjAddress: CORD 721 Township: BELPRE Section Number: C ity: State: OH Zip Code: . ILocation Number: 42 Location Map Y ean 1981 Location Area: CONSTRUCTION DETAILS )i !Borehole D iam eter *--| Casing D iam eter 12 in. W ell Use: i jA quifer Type: Total Depth: 57ft. Depth to Bedrock: Casing Thickness: Casing Length: 34ft. Screen Length: Date o f Com pletion: 4/29/76 Driller's Name: LAYNE-OHIO, COLS WELL TEST DETAILS Static W ater Level: 16ft. 1-1' .wdown: 5 ft. Test Rate: 503 gpm Test Duration: 2 hrs. Associated Reports NONE ^ WELL LOG Formations , BRN CLAY BRN SANDYCLAY SANDY GRAVEL ! RED SHALE From l a 0 - 14 14 - 34 34 - 56 56 - 57 l, I I -a ; "3 OOOSO3 http.7/w w w .d nr.state.oh.us/w ater/m aptechs/w ellogs/app/w ell_log_report.asp?w ln=450860& cnty=W A SH n... 1/17/200!  in n .m WELL INFORMATION - DRIFT WELLS The (aune O hio Com pany A Division of LAYNEWESTERN COMPANY, INC. ......................... W A T E R S U P P L Y S E R V I C E S ......................... ... . WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 492 1 V u lca n A venue C olum bus. O h io 4 3 2 2 8 (6 14 )876-1195 Nam e o f Job Little Hocking Water & Sewer______________________________ Date 1 2 - 2 0 - 8 5 C ity o r Village Little Hocking_______________________ |_____________________________ State Ohio___________ W ell N o .: P.W. 5 Drillers: F. Webb & D . Colburn_________________ Rig: 4 5 _______________ Well Locatio n : ___________________ f t . (______) a n d ______________________ f t . ( ______ ) o f th e _________________________ cor Section _________ . T w p . ____________ (_______ ), R a n g e _____________ (______ ) __________________________________________ __ Cc Otherwise located as Adjacent to T.H. 5 and T.W. 5 A __________________________ W ork Began: 1 2 - 3 --8 5 ___________ W o rk C om pleted: 1 2 - 1 2 --8 5 W ell D epth to Plug: A ll measurements made fr o m existing ground level at tim e w e ll was d rilled . Casing Record: 56 * Amount 43 43 Dia. 24" 12" Wt. or Thickness .3 7 5 .3 7 5 Material steel steel with weldedjointj from with weldedj0jntsf rom to to with joints from to Screen Record: Type Cook Amount 15' Dia. .375 Opening Material S.S. with welded joints from ** to 1 5 with joints from to Type of Seal at Bottom S.S. Plate Hole Record: 24" inch from inch from 0 to 5 6 ' to Gravel Pack Record: Amount Size 4 to n J i l x 1 / 8" Source Parry Gravel From 56' To 21 00504 Feet 0 20 27 37 45 WELL LOG Feet Description to 2 0 ______ B r o w n c l a y _____________________________________________________________ to 2 7 ______ B r o w n s a n d y c l a y ________________________________ _______ to 3 7 _______ B r o w n c l a y w i t h c o a r s e t o f i n e s a n d _________________ to 4 5 ______ M e d iu m t o c o a r s e s a n d a n d g r a v e l w i t h ' a a f l d f i n e sand to 5 7 ______ M e d iu m t o c o a r s e s a n d a n d g r a v e l ___________________________ '_______________________ t O ____________________________________________________________ ___________ _ _ _ _ _________________________________________________ ________________________________________ ________________ ____________ t o _________________ ________________________________________________________________________ ____________ t o _______________________________________________ __ _____________________ __________________ ____________ t o _______________ _______________________ _______________________________________ _ _ _____ ____________ t o ________________ _____________________ _______________________________________________ ____________ t o _______________ ___________________ ______________________________________________ _______ ____________ t o ________________ ______ _______ _____________________________________________________ _ ___________ t o _________________ ______________ ___________________________________________________________ ___________ t o ______________________ ____________ to ___________ _ ______ _____________________________________________________________ ____________ to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Well Test Data: Static Level i 8 1 8" ; pumping level 3 1 1 -- after ^4 hours pumping at 4 0 2 _____ g.pj Length of test '_______ hrs. See Well Test Data Sheet Dated__________________________________________________ REMARKS: 00503 WELL INFORMATION - DRIFT WELLS The (aune O hio C om pany K Division of LAYNCWCSTERN COMPANY. INC. ...... WATER SUPPLY S E R V I C E S ..... -- .......... WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 4921 Vulcan Avenue Colombo, Ohio 43228 * (614)8 76-1 19 5 Name of Job Little Hocking________________ _______ ;______ Date 8/31/84 C ity or V illage____ Little Hocking________________ ___________ State Ohio W ell N o.: T -W -1 Drillers: D . Havens__________________ __________ Rig: S R ________ Well Location: ft. (_____I and _ _ _ _ _ _ _ _ _ _ _ _ _ ft.( ) of the _______ corne Section ________ , Twp. _ _ _ _ _ _ _ ( ). Range _ _ _ _ _ _ _ (_____ ) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Cou . -3 0 0 ' Otherwise located as IDO'1 south of PW # 3 _______________________________ _________________________ Work Began: 8 / 3 0 / 8 4 Work Completed: 8 / 3 0 / 8 4 Well Depth to Plug: All measurements made from existing ground level at time well was drilled. Casing Reoord: 55' Amount 50' Oia. Wt. or Thickness Material 3 " Sch. 40 PVC w;thscrew ioints from to with joints from to Screen Record: Type Slot . 0 1 0 with ioints from to Amount 5' Oia. Opening 3" .010 Material PVC with screw ioints from to Type of Seal at Bottom PVC with ioints from to Hole Record: inch from to inch from to Gravel Pack Record: Am ount 1100# Size #4 Source Parry Gravel From 58' To 30* SEE O THER SIDE o o so e WELL LOG Feet Feet Description o to 5 Brown clay 5 to 1 0 Brown sandy clay____________________________ _______ 1 0 to 1 5 Brown sandy clay, traces of crrav clav 1 5 to 3 2 3 2 to 5 3 5 3 to 5 7 Brown sandy clay, layers of sand Sand and gravel Red shale, blue shale _________ t o _________ _ _ . _ _ _ _ _ _ _ _ t o __________ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ____________ t o _____________ ____________________________________________________________________________ t o __________ _ _________________________________________________________________________ __ ____________ t o ______ '______ ______________________________________________________________________________ ______________ t o ______________________________________________________________________________________________________________ t o __________________________________________________________________________________________ ___________ t o _________________ ______________ t o _________________________ ______ ,_____ to ____________ _____________________________________________________________________________ Wi-eell>T-ees>tDsata: S tatic Level ---t -"-l-.-~-i-`---- ; pumping level after hours pumping at ---------------- g.p. Length o f t e s t _____________ hrs. See W ell T est Data Sheet D a te d ______________________________________________________________ REMARKS: 1 H 1 000507 WELL INFORMAT ON - DRIFT WELLS The (aune O hio C om pany A Division of LAYNE-WESTERN COMPANY. IN C .* ---- -- - WATER SUPPLY SERVICES' WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 492 1 Vulcan Avenue C olum bus, O h io 4 3 2 2 8 1614) 876-1195 Name of Job - Little Hockina C ity o r Village Little Hocking W ell N o.: T W -2 . Drillers: D. Havens W ell Location: ft. ( ) and Section .Twp. ( ). Range OO* Otherwise located as 3 0 0 *" south of PW 3 ( ft.C Date State Rig: ) of the 8/31/84 Ohio SR come Cou W ork Began: 8/30/84 -W o rk Com pleted: 8/30/84 W ell D epth to Plug: A ll measurements made fro m existing ground level at tim e w e ll was d rilled . Casing Record: 55 Amount 50 Dia. 3 W t. or Thickness Sch. 40 M a te ria l PVC w ith screw ioints from to Screen Record: Type Slot .010 w ith w ith oints from ioints from to to Amount 5' Dia. 3H Opening .010 M aterial PVC w ith screw ioints from to w ith ioints from to Type of Seal at B ottom P V C _______________________________________ Hole Record: ____________ ________________ inch fro m _______________ to _____________ _______________ inch f r o m ______________________________ to Gravel Pack Record: Amount 1300# Size #4 Source Parry Gravel From To 58' . 30' 00050S Feet Feet 0 to 5 5 to 30 30 to 55 55 to 58 to WELL LOG Description Brown clay Brown sandy clay, layers of sand Sand and gravel Red shale and blue shale to to to to to to < to to to to Well Test Data: i - e > - b * Length of test Static Level I B . 3 * ; pumping level hrs. See Well Test Data Sheet Dated REMARKS: after hours pumping at '* 9-P- 000509 WELL INFORMATION-D R FT WELLS The (aune O hio C om pany A Division of LAYN E WESTERN COMPANY. INC. W A T E R S U P P L Y S E R V I C E S WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 4921 Vulcan Avenue Columbus, Ohio 43228 1614) 876-1195 Name of Job Little Hocking City or Village Little Hocking Well No.: T\N-3 Drillers: ^ Havens Date 8/31/84 State Ohio Ria: SR Well Location: ft. ( ) and ft.< ) of the corne Section ,Twp. ( ),Range () Coui Otherwise located as 300* west of existing wells. Along edge of right-away Work Began:____ 8 / 2 8 / 8 4______ Work Completed: 8 /2 8 /8 4 Well Depth to Plug: All measurements made from existing ground level at time well was drilled. Casing Record: 55 1 Amount 50' Dia. Wt. or Thickness Material 3 " Sch. 4 0 P V C with s c r e w joints from to \ Screen Record: Type _ Slot #.010 with with joints from joints from to to Amount Dia. Opening 5 ' 3 " #010 Material PVC with joints from to with joints from to Type of Seal at Bottom PVC Hole Record: __________ ____________inch from ___________________________ to ________________________inch from _________________ ________ to Gravel Pack Record: Amount 1100# Size Source #4 Parry Gravel From 58' To 30' 000510 Feet Feet *0 to 5 WELL LOG Brown clav Description 5 to 30 Brown sand clav. traces of arav clav 10* - 15 30 to 55 Sand and crave1 55 to 58 Blue shale to to to to to to to to to to to to I Well Test Data: Static Level 3 - 0 - 1 ; pumping level after hours pumping at g.p.m. I Length of test REMARKS: I hrs. See Well Test Data Sheet Dated I I I I 9 oosii WELL INFORMATION - DRIFT WELLS The (aune O hio C om pany A Division of LAYNE-WESTERN COMPANY. INC. ... .. -W A T E R SUPPLY SER VIC ES ..................... .. WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 4921 Vulcan Avenue Columbus, Ohio 43228 (614)876-1195 Name of Job Little Hocking Date 8/31/84 City or Village Well No.: Little Hocking t w -4- Drillers: D . Havens State Ohio Rig: SR Well Location: ft. ( ) and f U ) of the corner of Section , Twp. ( ),Range () County. Otherwise located as 3 0 0 * west of existing wells along edge of right-away south of Well No. 3_____________________________________________________________ Work-Began: 8 / 2 9 / 8 4 ______ . Work Completed: 8 / 2 9 / 8 4 Well Depth to Plug: All measurements made from existing ground level at time well was drilled. Casing Record: ' 54 * Amount 54' Dia. Wt. or Thickness Material 3" Sch. 40 PVC with screw ioints from with ioints from to to Screen Record: Type Slot #010 P V C with ioints f r o m to Amount 5' Dia. 3" Opening .010 Material PVC withscrew ioints from to Type of Seal at Bottom Hole Record: PVC with ioints from to Gravel Pack Record: inch from inch from to to Amount 1100# Size #4 Source Parry Gravel From 58 To 30 OOO5 1 2 Feet Feet o to 5 5 to 10 10 to 15 15 to 30 30 to 54 54 to 58 WELL LOG Description Brown Clay Brown sandy clay Brown sandy clay, traces of arav clav Brown sandy clav, trace of sand Sand and crave1 Blue shale to to to to to to to to to to W ell Test D ata: Length o f test Static Level -- ; pum ping level ------------ hrs. See Well T e s t Data Sheet Dated after hours pumping at REMARKS: . g.p.m . 000513 1 WELL INFORMATION - DRIFT WELLS The faune O hio Com pany A Division of LAYNE-WESTERN COMPANY. INC. ' WATER SUPPLY SERVICES ........... WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 4921 Vulcan A venue C olum bus, O h io 4 3 2 2 8 (6 14 )8 7 6-1 1 9 5 " 1 Name of Job Little Hocking Sewer & Water 1 C ity o r Village Little Hocking -- W ell N o.: T W - S - Drillers: D. Havens Date 11/2/84 State Ohio Rig: Rotary Well Location: r~ Section , Twp. ft. ( ) and ( ), Range f t .( ) o f the () O therw ise located as 300' west Of T.H #3 corner of Countv. * W ork Began: 10/30/84 W ork Com pleted: 10/30/84 W ell D epth to Plug: 56' A ll measurements made fro m existing ground level at tim e well was d rilled. Casing Record: j Amount Dia. W t. or Thickness M a te ria l V . 51' 4 " 40 PVC w ith ioints from to w ith m 1 Screen Record: Type Diedrich V w ith Amount Dia. Opening M aterial p 5' 4" .010 PVC w ith i w ith P1 T y p e o f Seal at B o tto m I Hole Record: PVC plug - f 7 7/8 inch from o o joints from joints from joints from joints from B0' to to to to f Gravel Pack Record: inch fro m to 1r Amount 15001 Size l/8xl/4 Source Smith Concrete From 30' To 56' 0(C514 WELL LOG Feet 0 28 32 38 41 56 32 37 38 39 42 to to to to to to to to to to to to Feet 28 32 38 41 56 60 34 38 39 42 44 Washed Samples Brown clav. stiff Brown Sandv clav Description \ Brown sandv clav, soft Gray sand, traces of clay (more clay) Sand and qravel, fine sand Gray shale Spoons Sand, traces of clay, brown Brown sand, traces of clay Gray sand, traces of clay Washed Sand and gravel 42 to 47 Washed 47 to 47 to 52 54 to 49 52 54 56 Sand and gravel Washed Sand and gravel Washed We-lel T-eest Dsata: Length of test Static Level ; pumping level hrs. See Well Test Data Sheet D ated after hours pumping at REMARKS: g.p.m. 000515 W ELL IN FO R M A TIO N - D R IF T W ELLS The (aune Ohio Com pany A Division of LAYNE-WESTERN COMPANY. INC. - .................... -- W A T E R S U P P L Y S E R V I C E S ................... WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 4 9 2 1 V ulcan Avenue C olum bus, O h io 4 3 2 2 8 (614 )8 7 6*1 1 95 Name of Job Little. locking Sewer & Water ________________ Date 11/2/84 C ity o r Village Little Hocking_____________________________ _____________________ State Ohio Well N o.: TW ~ b Drillers: D. Havens______________________________ Rig: Rotary Well Location: ft. ( ) and Section ,T w p . ( ), Range Otherwise located as 300* west of TH 14 ft.( () ) o f the corner o f Countv. W ork Began: 10/31/84 W ork Completed: 10/31/84 W ell D epth to Plug: A ll measurements made fro m existing ground level at tim e w ell was d rilled . Casing Record: 561 I- Amount Dia. W t: or Thickness Material f 51' 4" 40 1 PVC w ith i w ith joints from joints from to to Screen Record: Type _ Diedrich w ith jo in from to Amount 5' Dia. 4" Opening .010 M aterial PVC w ith joints from to Type o f Seal at B ottom PVC plug w ith joints from to Hole Record: 7 7/8 inch from 0 to 60' inch f r o m _____________________________ to Gravel Pack Record: n Amount Size 1500 l/8xl/4 Source Smith Concrete From 30' To 56* 000516 rv* WELL LOG Feet Feet Description 0 to 16______Brown clay, stiff______________________________ _ 16 to 36______Brown sandy clay with traces of gray clay__________ 36 to 42______Sand and gravel (small)_________________________ 42 to 56______Sand some small gravel (mostly sand)_____________ 56 to 60 Gray shale_________________________________________ _ _______________ to _ _ _ _ _ _ _ _ _______________ to _ _ _ _ _ _ _ _______________ t o __________________ _______________ t o __________________ _______________ t o ______________________________________________________________________________________________________________ _______________ t o ________ .______ _______________________________________ _______________ t o _________________________________________________________________________________________ _____________________ _______________ t o ________________________________________________________________________________________________ t o ______________________________________________________________________________________________________________ _______________t o ____________________ .__________________________________________________________________________________________ _______________ t o ' _______________ __________ n I_ n W ell Test Data: Static Level l b f t ; pumping level after hours pumping at g.p .m . ------- -------------- -------- ---------------- Length o f t e s t _____________ hrs. See W ell T e s t Data Sheet D a te d ____________________________________________________ _ REMARKS: 00051? WELL INFORMATION - DRIFT WELLS The (aune O hio C om pany A Division of LAYNEWESTERN COMPANY. INC. > * T c S U P P L Y S E R V I C E S WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 4921 Vulcan Avenue * C olu m b us, O h io 4 3 2 2 8 * (6 1 4 ) 8 7 6 -1 1 9 5 Nam e o f Job Tiittle Hockina Water & Sewer C ity or Village Tittitle Hocking_________________ W ell N o.: Q Drillers: n. L. Havens Well Location: ft. ( ) and ft.( Section , Twp. ( ), Range () Otherwise located as 2 0 0 - 3 0 0 ' northwest of PW 1 Date 1 1 - 2 5 - 8 5 State Ohio Rig: Rotary ) of the corner of C o u n ty . W o rk Began: i t - I Q - r r ___________ W o rk C o m p le te d : 1 1 - 1 9 - 8 5 W ell D epth to Plug: 5 6 * A ll measurements made from existing ground level at tim e w ell was drilled. Casing Record: Amount Dia. Wt. or Thickness Material 53* 6" 40 P.V.C . with glue joints from 5 1 ' to with joints from to with joints from to Screen Record: Type C o o k Amount Dia. Opening Material 5 ' 6" 010 P . V . C . with with joints from joints from to to T y p e o f Seal at B o tto m P.V.C. cap Hole Record: 83s inch from 0 to 5 6 ' inch from to Gravel Pack Record: Amount 600 lb s . Size #4 Perry Source From 56' To 000518 00 rH I. WELL LOG Feet Feet Description 0 to 8 Hard brown clay, 5000 lbs. P.D. R to 18 Med. to hard brown sandy clay, 0-1000 P.D. w ! 1 fl to 28 Soft sandy brown clay, 0 P.D. i 2B to 3 8 Sandv silt and soft brown clay, 0 P.D. w 3R to 56 Sand and qravel, 0 P.D. r 56 to to Ir1 to to r to Grav shale ! to to fi to ! to | to to Well Test Data: Static Level ; pumping level after hours pumping at Length of test hrs. See Well Test Data Sheet Dated REMARKS: B&N collected water samples and water static levels P.D. = Pull Down on drill bit -- -- -- -- q.p.m. 000519 ' Reynolds Supply, Inc. COMPLETE MUNICIPAL & INDUSTRIAL WATER SYSTEMS FORMATION LOG OF WELL Starting Date 10 / 2 7 / 8 7 F in is h e d nwnpr LITTLE HOCKING WATER DISTRICT Localion 10/27/87 W ell N um ber T e s t H ole 10 \ 1 O 11 in fOc- TOTAL DEPTH - 5 ft. - IS IS - 20 ^ - 25 2S - 30 7 ' - 35 ko - ks 1 50 50-53 53 THICKNESS EACH STRATUM 5 ft. . '5 5 5 5 5 5 5 5 ` 5 3 . FORM ATIO N Top Soil and clay Clay Clay C1ay Clay Coarse sand and gravel Coarse sand and Gravel Fi ne sand and qravel Fine sand and qravel Fine sand and some gravel Sand and gravel Bedrock 1 1 , ;1 11 - 1. --- --............--..... ......................................... 'T-fTrit JiiS--2l i1lTt Or au/ D nw n " " 11 - ' . j Reynolds Supply, Inc. COMPLETE MUNICIPAL & INDUSTRIAL WATER SYSTEMS FORMATION LOG OF WELL `arting Date 10 / 27/87 Finished _ 10/27/87 -lWnr LITTLE HOCKING WATER DISTRICT Location , Well N n m h e r Test Hoi e 11 TOTAL OEPTH - - 5 ft. 5-10 1 - 15 15-20 2 - 25 2j - 30 3^ - 35 3 - AO 40 - it5 . _o_______ 50 - 55 5-60 6u T 63 '3 THICKNESS EACH STRATUM 5 ft. . '5 5 5. 5 5 5 5 5 5 5 5 3 FORM ATION Sandy-tppfini 1 and c la y Sandv s i l t and c l a v Sandy c la y Sandy c la y Sandy c la y Sand (wet) Clean sand and q ra v e l Coarse clean sand and g ra v e l Coarse sand and g ra v e l Coarse sand and gra vel Coarse sand and q ra ve l Fine sand and q ra v e l F i n e Sand Bedrock - red cla v Ti i. *' > * *` - < . 11 tai Water l evel O r a s * O \*;rx : 000521 Reynolds Supply, Inc. COMPLETE MUNICIPAL & INDUSTRI AL WATER SYSTEMS K. FORMATION LOG OF WELL Starting Date 1 0 / 2 8 / 8 7 ______________ Finished _1 0 / 2 8 / 8 7 _____________________ Well N ,, m h * r TEST H O L E 1 2 Hounpr L IT T L E HOCKING WATER D IS T R IC T Location _________________________________________ _>______________ 0 1 in 1 TO TAL DEPTH T H IC K N E S S EACH STRATUM 0 - 5 ft. I o' - IS IS - 20 >0 - 2S 2S - SO ' 30 - 35 3 5 - 1 * 0 /.____ - 50 55-59 59 5 ft. 5 5 5. 5' ' 5 5 s 5 5 5 : k T od S o i l Sandy c la y Sandy c la y Sandy c l a y Wet sandy c l a y Wet Sandy cl ay Coarse sand and q r a v e l Coarse sand and q ra v e l Coarse sand and q ra v e l Coarse sand and q ra v e l Coarse sand and g r a v e l Fine sand and g ra ve l Bedrock ' FOR M ATIO N ' 11-u3-*\ '1 O -T i1 1 UT 0 1 UT UT * . 1 `* ' 1 000522