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SAMPLING INVESTIGATION RESULTS LITTLE HOCKING WATER ASSOCIATION WELL FIELD WASHINGTON COUNTY, OHIO Date: April 2003 Project No.: 7482 18983762.00010 A CORPORATE REMEDIATION GROUP An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 00030J. 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 Temporary 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 Mechanisms and 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 000303 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) LHSIreportl Apr. 17, 03 Wilmington, DE 000304 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 in O0030S 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. LHSIreporti Apr. 17, 03 Wilmington, DE iv 000306 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 1 000307 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 000308 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 000309 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, 2001). 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 4 000310 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, DE 0003^1 5 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 temporary 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 000312 6 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. LHSIreportl Apr. 17. 03 Wilmington, DE 7 000313 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 8 000314 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 9 00031S 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 LHSIreportl Apr. 17, 03 Wilmington, DE 10 000316 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 000317 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 ffom5.69 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 00031S 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 000319 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 000320 14 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 Proceduresfor 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 Evaluationfor Additional Water Supplyfrom Blennerhassett Island, unpublished report. Kozar, M.D. and M.V. Mathes, 2001. Aquifer-Characteristics Datafor West Virginia. Water-Resources Investigations Report 01-4036, United States Geological Survey, 74 p. LHSIreportl Apr. 17, 03 Wilmington, DE 15 000321 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 16 000322 TABLES Table 1 C-8 in Groundwater from Temporary Borings Little Hocking Water Association Washington County, Ohio W W O-G- LHWAN1 W W O-G- LHWANE1 W W O-G- LHWANE1 WWO-G- LHWANE2 W W O-G- LHWAE1 W W O-G- LHWAS1 WWO-G- LHWAS2 WWO-G- LHWASW1 WWO-G- LHWASW1 WWO-G- LHWASW1 WWO-G- LHWASW1 WWO-G- LHWASW1 WWO-G- LHWASW1 WWO-G- LHWAW1 WWO-G- LHWAW2 WWO-G- LHWANW1 WWO-G- LHWANW1 WWO-G- LHWANW1 (17-22) (21-27)* (56-58) (20.7-25.7) (21-26) (25-30) (25-30) (28.5-33) (35-40)* (40-45) (45-50) (50-55) (55-56)* (29-34) (33-38) (19-25) (24-29) (24-29)-2(DUP) * Sample split with the Ohio EPA. 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 000323 4/17/03 Page 1 of 1 LH samples Table 2 C-8 in Production and Test Wells Little Hocking W ater Association Washingon County, Ohio W a i I t ^ W ell #1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 LHPSD1 W ell #2 LHPSD1 LHPSD2 W ell #3 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPSD2 LHPS02 LHPSD2 LHPSD2 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD3 W ell #5 LHPSD3 LHPSD3 LHPSD3 LHPSD3 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSD5 TW -1 TW -2 TW -3 LHPSD5 LHPSD5 LHPSD5 LHPSD5 LHPSDTW1 LHPSDTW1 LHPSDTW 2 LHPSDTW 2 LHPSDTW 3 LHPSDTW 3 S am 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 8/21/02 122-'02 8/21/02 1.22/02 8/21/02 Ct-Bug/I : - . V 1.82 Production W ell 1.72 Production W ell 2.37 Production W ell 2.99 Production W ell 2.02 Production W ell 3.65 Production W ell 3.41 Production W ell 3.38 Production W ell 3.72 Production W ell 3.52 duplicate 2.97 Production W ell 2.03 Production W ell 2.07 duplicate 3.31 Production W ell 3.4 Production W ell 4 26 Production W ell 3.98 Production W ell 3.62 Production W ell 0.844 Production W ell 0.744 Production W ell 0.42 Production W ell 0.827 Production W ell 0.783 Production W ell 0.952 Production W ell 0.495 Production W ell 0.434 duplicate 0.733 Production W ell 7.66 Production W ell 6.22 Production W ell 6.14 duplicate 5.69 Production W ell 6.57 Production W ell 6.11 Production W ell 8.09 Production W ell 8.58 Production W ell 6.93 Production W ell 7.16 duplicate 2.16 Test well 0.81 Test well 0.103 Test well 0.081 Test well 4.48 T es t well 4.17 1 e s t w p II 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 000324 LH samples Table 2 C-8 in Production and Test Wells Little Hocking Water Association Washingon County, Ohio i TW -4 TW -5 TW -6 TW -9 TW -10 TW -11 TW -12 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHTORCHBS BARTLETTCC 339B STA LHPSDTW 4 LHPSDTW4 LHPSDTW 4 LHPSDTW 4 LHPSDTW 4 LHPSDTW 4 LHPSDTW 5 LHPSDTW 6 LHPSDTW 6 LHPSDTWC LHPSDTW 9 LHPSDTW 9 LH PSDTW 10 LHPSDTW 10 LHPSDTW11 LHPSDTW 11 LH PSDTW 12 LHPSDTW 12 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHPSDEP001 LHTORCHBS BARTLETTCC 339B STA 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 8/2V02 1/22/02 a'21/02 1/21/02 8/21/02 1/21/02 8/21/02 1/21/02 a'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 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 Test well 12.61 Test well 12.26 T est well 12.35 T est well 11.32 Test well 9.22 Test well 10.54 T e s t wll __________6 7 Test well 7.03 T est well 6 81 duplicate 6.81 T est well 7.33 T est well 7 09 T es t well 7.43 Test well 6 85 T es t well 7.38 Test welll 7.07 Test well 7.39 T e s t'w e ll 6.9 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 Shaded cells indicate groundwater sampled for the Little Hocking Sampling Investigation in August 2002. 4/17/03 Page 2 of 2 00032S LH samples Table 3 Groundwater Elevation Data for Production and Test Wells August 2002 Little Hocking Water Association Washington County, Ohio ` /-r; . : ib Well #1 Well #2 Well #3 Well #5 TW-1 TW -2 TW-3 TW-4 TW -5 TW-6 TW -9 T W -10 TW -11 TW -12 *. - ~ L'_-. ; -s. -> E leV atfon* 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 D eptn to- .G ro u n d w a te fl W ater; EevatiiV 'ffeefl ` (8/21/02)3 ^ IlillS L ) ' 1 56.88 556.59 42.88 570.83 39.68 573.86 35.62 577.56 17.38 580.75 18.63 581.29 22.78 576.97 18.16 580.36 30.63 577.65 19.03 579.67 21.44 577.09 17.77 578.06 26.57 577.22 23.95 578.27 Ohio River 584.7 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 000326 LH samples Table 4 C-8 in Soil from Temporary Borings Little Hocking Water Association Washington County, Ohio 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) 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 8/29/02 170 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 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. 4JZ C 000 4/17/03 Page 1 of 1 LH samples FIGURES 000328 10000 SCALE 10000' DESIGNED DRAWN DEL CHECKED MPS APPR0VED(DESIGN) THE BASEMAP IS TAKEN FROM THE BELPRE, OH, LUBECK, WV AND USGS 7,5 MINUTE QUADRANGLE MAPS. INITIALS SITE LOCATION MAP 4 Corporate Remediation Group A n Alliance between DuPont and URS Diamond DuPont Washington Works Washington, West Virginia APPROVED(CONSTRUCTION) Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 9CM DATE Not to Scale 1 2 /3 /0 2 CAD RLE NO, F ig u re 1 FIGURE 1 TV-5 6.22 ^ WELL #5 TV-6 1.79 TV-9 + 0.364 TV-3 4.48 TV-04 + 37.10 I WELL #1 1.72 ! WELL #2 2.97 ------------ mWELL #3 J 0.744 TV-10 + 1.90 ^TV-11 ' 1.41 TV-12 + 0.758 0 \A \ LEGEND: WATER SUPPLY WELL + TEST WELL 1.79 C--8 RESULTS IN U G /L SCALE 200 0 200' 000330 Corporate Remedtatkxi Group A n AUianoo b etw tm DuPont and URS Diamond Barley Mill Plaza, Building 27 ______ Wilmington, Delaware 19805 C --8 IN GROUNDWATER JANUARY, 2 0 0 2 Little Hocking Water Association Little Hocking, Ohio SCM As Shown BWC 4 /1 2 /0 2 CHECKED TDL DEL appMved CADFILE NO. 7423A002 000331 OHIO RIVER LEGEND Eolian (?) sand, silt Colluvium Local tributary sand and gravel C o a rs e -g ra in e d Ohio River alluvium Fine-grained Ohio River alluvium Approximated fill boundary N o rth A PLEISTOCENE TERRACE ______________ A _______________ HOLOCENE FLOODPLAIN ___________ A___________ HOLOCENE FLOODPLAIN lC South A' PLEISTOCENE TERRACE ___________A__________ DUPONT WASHINGTON WORKS WEST VIRGINIA Y14-MW02 VERTICAL SCALE EXAGGERATION AT 1:9 LEGEND: -., ;Q:> PLEISTOCENE GLACIAL OUTWASH DEPOSITS ' COURSE SAND AND GRAVEL REWORKED PLEISTOCENE ALLUVIUM SAND AND GRAVEL 000332 HORIZONTAL SCALE 90 90' DESIGNED DRAWN DEL CHECKED MPS APPROVED(DESIGN) INITIALS APPROVED(CONSTRUCnON) Corporate Remediation Group An Alliance between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delawore 19805 GENERALIZED GEOLOGIC CROSSSECTION AT RIVER MILE 190 DuPont Washington Works W ashington, West Virginia SCALE AsShown OATE 1 2 /0 /0 2 cad m e no. Figur* 6 neune 5 TV-5 4 L WELL # 5 LHWANW--1 ZA LHW AW -2 TV-6 X/ / LHW AN-1 X TV -04 A LHWASW-- 1 X v , LH W A N E-2 A LHW AE-1 X LHW AW -1 X LHW AS-1 WELL # 3 TV-1 TV-11 TV-12 OVA\ 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. 000333 Corporate Group A n AlHanom b a h o to n DuPont and UBS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19805 TEMPORARY BORING LOCATIONS Little Hocking W ater Association Little Hocking, Ohio SGU DESCD Am Shown 9 /2 6 /0 2 MmM CM) FU NO. DEL 363SA009 ------ TV-12 + 578.27 000335 NOTE: LOCATIONS OF WELLS AND BORINGS ARE APPROXIMATE. SCALE 200 200' BORING GROUNDWATER SAMPLES 581.29 DIRECTION OF GROUNDWATER FLOW GROUNDWATER CONTOUR WITH ELEVATION WATER LEVEL ELEVATIONS IN FEET MSL ia 'jJ Corporate Ramodatlon Group A n AUianco b aftu aan D u P o n t a n d URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delaware 19605 GROUNDWATER ELEVATION CONTOUR MAP AUGUST, 2 0 0 2 Little Hocking Water Association Little Hocking, Ohio SCALE A Shown KJE 4 /1 2 /0 2 D ESO CO CHECKED TOL MnnN DEL VMtACb CAD FEZ NO. 3635AD02 FHURE 8 NORTH A SOUTH A' ELEVATION (FEET MSL) (8.09 ug/l) SCREENED INTERVAL IN TEST WELL OR PRODUCTION WELL AND C - 8 CONCENTRATION IN GROUNDWATER (N D = < 0 .0 1 u g A ) GROUND WATER SAMPLE LOCATION IN GEOPROBE OR ROTOSONIC BORING AND C - 8 CONCENTRATION IN GROUNDWATER ( N D - < 0 .0 1 u g A ) *(8.4ugAs) SOIL SAMPLE LOCATION IN GEOPROBE OR ROTOSONIC BORING AND C - 8 CONCENTRATION IN SOIL (N D=N O N DETECT A T STATED REPORTING LIMIT) GROUNDWATER ELEVATION Horizontal Scale: 1" = 6 0 ' V e rtic a l S cale: 1" = 1 0 ' 000338 CRO SS-SECTIO N A -A ' Corporate Remedatlon Group A n AUianca between DuPont and URS Diamond Barley Mill Plaza, Building 27 Wilmington, Delawore 1 9 8 8 0 -0 0 2 7 Little Hocking Water Association Little Hocking, Ohio m i MR tnUn. neuv AmShewn 02/28/2009 9830C007 11 NORTH B SOUTH ELEVATION (FEET MSL) LEGEND: (4.26 ug /l) SCREENED INTERVAL IN TEST WELL OR PRODUCTION WELL AND C - 8 CONCENTRATION IN GROUNDWATER (N D = < 0 .0 1 ugA) ESTIMATED SCREENED INTERVAL IN TEST WELL (0.952 ugA) OR PRODUCTION WELL AND C - 8 CONCENTRATION 9 IN GROUNDWATER (N D = < 0 .0 1 u g /L ) GROUNDWATER ELEVATION Horizontal Scale: 1" = 60' Vertical Scale: 1" = 10' 000339 llDl Corporate Remedatlon Group An AUianc* betw tm DuPont and UJtS Diamond Barley Mill Plazo, Building 27 Wilmington, Delaware 19800--0027 CRO SS-SECTIO N B - B ' Little Hocking Water Association Little Hocking. Ohio M S A* Shown DOT o n s N& 0 2 /2 8 /2 0 0 3 mm 12 West c WELL #2 East c LEGEND: (113 ug/U SCREENED INTERVAL IN TEST WELL OR PRODUCTION WELL AND C - 8 CONCENTRATION IN GROUNDWATER (N D = < 0.01 ugA) ? ESTIMATED SCREENED INTERVAL IN TEST WELL (1.73 ugA) OR PRODUCTION WELL AND C - 8 CONCENTRATION ? IN GROUNDWATER (N D = < 0 .01 ugA) . . GROUND WATER SAMPLE LOCATION IN GEOPROBE " W OR ROTOSONIC BORING AND C - 8 CONCENTRATION ^ IN GROUNDWATER (N D = < 0 .0 1 ugA) GROUNDWATER ELEVATION Horizontal Scale: 1" = 6 0 ' Vertical Scale: 1" = 10' 000340 Hins Corporate Remedtation Group An Allianc* b*tw*m DuPont and UJRS Diamond CROSS-SECTIO N C - C ' Little Hocking Water Association Little Hocking, Ohio Barley Mill Plaza, Building 27 Wilmington, Delaware 1 9 8 8 0 -0 0 2 7 CMS SMC aorUM.------ none A* Shewn 0 2 /2 8 /2 0 0 3 S6 35C00 8 13 APPENDIX A C-8 ANALYTICAL REPORTING 000341 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. Appendix A 000342 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 000343 Page 2 APPENDIX B GEOLOGIC LOGS FOR LITTLE HOCKING WATER ASSOCIATION WELL FIELD TEMPORARY BORINGS 000344 URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 L H W A -N 1 (page 1 of 1) ate 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** 597.69' * See Figure 6 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00'. : CD Q) Li Surf. Elev. 0) 597.69 Q 0- 597 O X QL O DESCRIPTION Brown silty T O P S O IL . S IL T Y C L A Y , top fe w inches is g ray w /o m ottles. B eco m es brown with lots o f orange, gray and dark brown mottles. Dry and crumbly. Sam ple nOP'* L0O0 100% 100% 200% 154% 121 5592 10- - 587 15582 20- 577 Light brown S IL T Y C LA Y, with gray mottles (fracture surfaces?) and som e rare orange mottles, hard, semi-plastic ,No mottles, few pebbles. 2" very dark brown S IL T Y C LA Y, mottles are BLACK after which there are no mottles. Brown S IL T Y C LA Y, rare fine to very fine sand, sticky. Rolls into coarse logs. Like above, soft. R a re sand and pebbles, Sandstone clasts a t 15.2 and 15.9'. Moist, not mottles. Brown S A N D Y /S IL T Y C LA 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 , m inor silt and clay, w et. Interb edd ed with m oist 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 moist, brown, fe w pebbles, cobble a t 1 8 ". B ottom is fine sand with little silt and no clay (2 1 .6 -2 2 '.) ccoo? 146% T D a t 22'. 25572 000345 30- URS DuPont Corporate Rem ediation Group W ashington W orks C onsent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 L H W A -N E 1 (page 1 of 2) Date Started Date Completed Drilling Method Sampling Method Company Logged By : August 20, 2002 : August 20, 2002 : Geoprobe : Continuous : Bowser Momer : 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'. : C0D1 Surf. Elev. QQ<0. 597.85 0- - 597 5- 592 DESCRIPTION Brown silty T O P S O IL , som e organics, dry. By .2' have tannish brown C L A Y E Y SILT, m icaceous, little organics, som e orange mottling, dry. R edd ish brown S IL T Y C L A Y , dry, m icaceou s, o ra n g e an d g ra y mottling. M oisture in sam ple by -7 .5 '. Increased clay with depth. Sam ple 10- -587 15582 20- 577 25.-5 7 2 30- Brown S IL T Y C LA Y, micaceous, som e fine to m edium sand, moist to wet, trace fine to m edium gravel to -1 0 .5 ' depth, well rounded. Continued 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 zo n e o f S IL T Y S A N D w / little fine to m ed ium 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 wet, 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 w et, dark brown to black stained zones at 2 2 .7 and 23.1'. Z ones are - 1 " thick Brown fine to medium 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 ed iu m well rounded g ravel a t b ase o f s a m p le [ - 3 0 1], w e t m icaceous. 000346 GW SAMP 1IDC DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 L H W A -N E 1 (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'. : <0D) Surf. Elev. QCL <D 597.85 30.-5 6 7 35.-5 6 2 ; ; .or: i .o*; ; -V--V- c i o-. i . o * ; ; -i.o o*; .<r; i, <*.0.'-; i.o*-.; C V - i i-C ; .o-; .e r; " o* ;}v .O .O .c ' ; .o-; ,<r; ; <.*.o''; '..a . * ' .'a.-. . .O .o -; .o - .a - .o ' - 40557 ; . a ; .o -; .-V--V - ; .o-; .or; ; DESCRIPTION Tannish brown silty fine to coarse S A N D with som e fine to m edium well rounded gravel, wet, m icaceous. Poor recovery 30-40' interval. S a m e as above with angular gravel >CD 8 0<U S am p le 45552 50547 . V-V : .or." .o ; -a.. a- >; -a.,o- . -a.- a.'- . . ; ; .a ; .o ; 'K 'K 'I K'W: '"-.V a'Kl Brown to dark brown silty fine to coarse S A N D w/ som e fine to coarse gravel, micaceous, wet. 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). TD @ 60'. 60- 000347 URS DuPont Corporate Rem ediation Group W ashington W orks C onsent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 L H W A -N E 2 (page 1 of 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'. : Surf. Elev. Q. Q) 596.64 O 0- - 596 5591 10- - 586 15581 20- 576 DESCRIPTION Brown, silty clay T O P S O IL , dry, crumbly. G ray S IL T Y CLAY, hard, dry, crumbly, few mottles. H eavy o range mottles, som e reds, few black. Gray/brown overall color. M ottles and fracture coating a re black, red and orange. Lighter oranges with depth. 8" long parting with orange coating. Brown S IL T Y C LA Y turning to olive brown clay and S IL T Y C LA Y. S em i- plastic, m oderately stiff to plastic. Sam ple Brown S IL T Y /S A N D Y C LA Y, dark brown mottles, sem i-plastic to plastic, moist. R a re pebbles, sand is fine to v e ry fine, so m e d ark brown to black m ottles, plastic, moist. 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 , -_ . d . d M edium SA N D, few pebbles, wet. (Poor recovery-depth estimated). T D at 25.7'. W ell set (3/4" PVC). GW SAMP 3 0 - 000348 DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 L H W A -E 1 (page 1 of 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 for approximate location ** Elevation assumes top of Well House #1 Floor Slab = 610.00' <D Li. C Surf. Elev. 0 596.39 Q 0- 596 O X % a. o 5591 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 horizon), H ard, dry. B elow is brown/gray S IL T Y C L A Y with lots o f orange mottles, few 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 10586 O live brown S IL T Y C L A Y with gray mottles and gray-coated fractures. No moist fractures. Sem i-plastic 15581 20576 25- - 571 30- S IL T Y T O S A N D Y C LA Y, plastic, sticky, soft, brown with green tinge, som e gray mottles, sandy zo nes m ore moist. N-6" Silty fine S A N D , brown, w et, sloppy. '-Brow n S A N D Y /S IL T Y C LA Y, gray and orange mottles, plastic, sticky. Brown gray S IL T Y /A N D Y C LA Y, plastic, moist. S A N D Y C LA Y, sticky, wet. Thinly interbedded (~2-5") FIN E SA N D +/- silt and S IL T Y /S A N D Y CLAY. S A N D is w et. B ottom 1/3 is S A N D Y B R O W N C L A Y , sticky, plastic. T D @ 26'. W ell set (3/4" PV C ) 000349 URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 L H W A -S 1 (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 Rlstow 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' (U <D Surf. Elev. Q. <D 596.46 Q 0- 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. B ecom es light brown with depth. M ixed orange and gray mottles. <>D OO ce(U S am ple 5- 591 10- 586 15581 20- 576 25- 571 30- G ra y m ottles h a v e m oisture inside (old rootlettes?) C la y is stiff b ut s em 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 dark brown mottles, moist, v e ry plastic, can roll into ropes. M ica is present, not noted abo ve. S A N D Y /S IL T Y C L A Y , Brown, moist, fine to v e ry fine sand g rains, d a y is becom ing sticky. -S A N D Y C L A Y are soft, and very moist (not w et). 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 moist, no odors. Light brown S IL T Y C LA Y, m inor fine sand, moist, sticky, w et sand stringer a t -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 LA Y S . Silty d a y is light brown and soft, S a n d y d a y s a re v e ry m oist and light brown. R E D R ILL - Interbedded brown C LA 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 (?). Moist, stiff. 006350 URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 L H W A -S 2 (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 Rlstow 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' : CD <D LL Surf. Elev. Q. CD 598.76 Q 0- 598 - 5- 593 - 10- 588 - 15- 583 - 20- 578 - 25- 573 - 30- DESCRIPTION Brown S IL TY C LAY w / lesser C L A YEY SILT. 0 -3 ' - Dry, Sandstone fragm ents a t 23", roots, crumbly. Brown S IL T Y C LA Y with gray, moist, sem i-plastic, roots, rare orange mottles. S IL T Y C LA Y, rare dk brn and gray m ottles. Sem i-plastic to crumbly, m ore clayey and se m i plastic a t b ase, stiff. T o p 12' dry. Sam ple Brown S IL T Y C L A Y (m ore d a y ). Sem i-p lastic to plastic, m ore moist a t base, rolls to string in hand a t base, 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 LA Y like above. W e t spots in gray mottles. Not as stiff. Slightly soft. W a ter level m easured next morning. Brown S IL T Y /S A N D Y CLAY, moist, sticky, soft, minor m ica and coal(?) fragm ents, s o m e g ra y mottling, m oister or w e t a lon g m ottles. S an d is fine to very fine grained. Brown S A N D Y C LA Y, very moist but not w et. 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. ^ B row n 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 CLAY. Brown S IL T Y S A N D with minor clay, w et, minor mica. ^SILTY S A N D Y CLAY, moist not wet, 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 pp ed ). N o reco very in this run. TA IT IV L * URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 L H W A -S W 1 (page 1 of 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' 0<1)) U_ Surf. Elev. 0) 596.87 a O X $ a. CD .-5 9 6 DESCRIPTION D ark brown T O P S O IL , dry. By .2' have tannish brown C L A Y E Y S ILT, som e organics, dry. ^Tannish brown S IL T Y C LA Y, with little organics, orange and grey mottling, dry. Sam ple (,3-.9) 5.-591 Tannish brown S IL T Y C L A Y with orange and gray mottling, dry. (5-5.6) 10- .-5 8 6 15.-581 20- 576 Brown S IL T Y C LA Y with som e gray mottling, dry to moist. (11.2-11.7) Tannish brown, s a m 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) 25- 571 30- J S - Thin black-stained zone at 24.5'. // / Brown C L A Y E Y S IL T, gray mottling, moist to wet, micaceous. Thin (2"), fine S A N D Y zone, w et at 29' followed by brown C L A Y E Y SILT, m icaceous, variably wet. (26.5-27) o eeasa- URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation Project # 1 8 9 8 3 7 6 2 L H W A -W 1 (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 Well House #1 Floor Slab = 610.00' : <D CD UL Surf. Elev. QC0)L 597.17 - 597 -592 10-- . 587 1 5 - - 582 DESCRIPTION Brown silty clay T O P S O IL . Dry, crumbly. G ray/Brow n S IL T Y CLA Y, few orange mottles, hard and dry, Increased mottling below 1', including o rang e and dark brown mottles, som ew hat crumbly. Sam ple Light brown S IL T Y C L A Y with g ra y m ottles, sem i-plastic, stiff, crum bles into sm all balls when rolled. S o m e orange mottled, continued semi-plastic, gray mottles appear to be rootlets. F ew gray mottle cracks appear moist vs the dry clay, semi-plastic. N o m oisture in m ottles. V e ry stiff, hard to break. 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 CLA 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 IL T with C L A Y (2"). yB ro w n S IL T Y CLAY, rare sand, few mottles. -S A N D Y S IL TY CLAY, Plastic, gray and orange mottles, som e mica. Small piece of coa Brown fine S A N D Y SILT, clayey, w et, sloppy OC 9 3 5 ^ URS DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 L H W A -W 2 (page 1 of 2) 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' : Surf. Elev. CL CD 597.20 O 597 5 - 592 10- 587 1 5 - 582 2 0 - . 577 2 5 - - 572 30- DESCRIPTION \Brow n silty T O P S O IL , dry, m inor roots, crumbly. ''Light brown silty clay T O P S O IL , dry, crumbly. G ra y S IL T Y C L A Y , dry, crum bly, no m ottles in u pp er .5'. B eco m es B row /gray with orange mottles below this, stiff, hard. C rum bles to small balls when rolled. Light brown S IL T Y C LA Y, g ray mottles, sem i-plastic, Dry, m inor dark brown mottles. Sam ple Still no m oisture noted. S IL T Y C L A Y is a little softer, little m o re m oisture, dry. M easured G W 15 m inutes after drilling, elevation not stable (rising) G ra y m ottles s ho w s o m e m oisture, fe w dark brown m ottles, clay is now a b le to be rolled into thin ropes betw een hands, S o m e mica below this point. R a re sand , m oist, plastic, sa n d is fine to v e ry fine. S ed 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 , very moist, light brown color, minor mica. 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 ery ponounced gray rootey channel -1 0 " long, w et inside, very soft and plastic clay. Rolls very thin. S A N D Y C L A 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 29 .2' (< = 3") 000356 TT^ C u m Cm DuPont Corporate Rem ediation Group W ashington W orks Consent Order Little Hocking Investigation P roject# 18983762 L H W A -W 2 (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 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' <<uu Surf. Elev. a>Q. 597.20 D 3 0 - , 567 a X * ODC. DESCRIPTION Brown S IL T Y C L A Y E Y S A N D , very sloppy, wet. S o m e gray coloring. Sticky, m ica.__________________________________________________________ Brown and G ray S IL T Y C LA Y, increased sand content with depth, moist. Sam ple 3 5 - - 562 G ra y S A N D Y C LA Y to C L A Y E Y sand with a few small pebbles, wet, for .8' becoming G ra y sand and small gravel, clean, w et, Bottom T S IL T Y S A N D and G R A V E L mix. T D GW SAMP 4 0 - 557 4 5 - 552 5 0 - . 547 5 5 - , 542 60- 000357 APPENDIX C GEOLOGIC LOGS FOR PRODUCTION AND TEST WELLS (PROVIDED BY LITTLE HOCKING) 0003SS :r Well Log and Drilling Report Page 1 of 1 \jje u ~ I Water W ell Log and D rilling Report Ohio Department o f Natural Resources D ivision o f Water Phone: 614-265-6740 em ail: cleve.brown@ dnr.state.oh.us Water Home: http://www.dnr.state.oh.us/water WELL LOG AND DRILLING REPORT 11Log Number: 389S39 RIGINAL OWNER AND LOCATION ginal O wner Nam e: LITTLEHOCKING WATER Lot Num ber: _jn ty: WASHINGTON Township: BELPRE Section Num ber: ddress: ys cation Num ber: 42 State: OH Zap C ode: L ocation M ap Y ea n 1981 L ocation A rea: INSTRUCTION DETAILS >orehole D iam eter: Casing Diam eter: 10 m. ell Use: .quifer Type: T otal Depth: 50ft. Depth to Bedrock: C asing T hickness: C asing Length: 51ft. Screen Length: D ate o f C om pletion: 11/28/70 D riller's Nam e: GM. BAKER & SON FELL TEST DETAILS S tatic W ater L evel: 10ft. .wdown: 25ft. Test Rate: 250gpm Associated Reports T est D uration: 40 hrs. NONE WELL LOG F orm ations SAND & CLAY SAND & CLAY G R A V E L /SA N D /C L A Y SAND & GRAVEL From To 0 22 22 36 36 40 40 50 t I 000360 ^ http://www.dnr.state.oh.us/water/maptechs/wellogs/app/well log report.asp?cnty=WASHINGTON&wln=... 1/17/2002 ^Vater Well Log and Drilling Report Page 1 of 1 W ater W ell Log and Drilling Report Ohio D epartm ent o f Natural Resources Division o f Water Phone: 614-265-6740 email: cleve.brown@ dnr.state.oh.us W ater Home: http://www.dnr.state.oh.us/water WELL LOG AND DRILLING REPORT Well Log Num ber: 389538 IORIGINAL OWNER AND LOCATION O riginal O w ner N am e: LITTLE HOCKING WATER L ot N um ber: i County: WASHINGTON Tow nship: BELPRE Section N um ber: IA d d ress: C ity: L ocation N um ber: 42 State: OH Zip C ode: L ocation M ap Y ea n 1981 L ocation Area: CONSTRUCTION D ETAILS | B orehole D iam eten Casing D iam eten 12 in. W en Use: | A quifer Type: T otal D epth: 60ft. Depth to Bedrock: C asing Thickness: C asing Length: 51ft. Screen Length: D ate o f C om pletion: 11/28/70 D riller's Nam e: G.M. BAKER & SON WELL TEST DETAILS Static W ater L evel: 16ft. .wdown: 20ft. T est R ate: 400gpm Associated Reports T est D uration: 24 hrs. NONE WELL LOG F orm ations SAND & CLAY SAND SAND & GRAVEL From To 0 - 27 27 - 31 31 - 60 000361 nttp://www.dnr.state.oh.us/water/maptechs/wellogs/app/well_log_report.asp?cnty=WASHINGTON&wln= l/17/20( Page 1 of 1 VJ&LL- # 3 W ater W ell Log and D rilling Report Ohio Department o f Natural Resources Division o f W ater Phone: 614-265-6740 email: cleve.brown@.dnr.state.oh.us W ater Home: http://www.dnr.state.oh.us/water WELL LOG AND DRILLING REPORT W ell Log N um ber: 450860 {o r ig in a l OWNER AND LOCATION O riginal O w ner N am e: LITTLEHOCKING WATER L ot Num ber: C ounty: WASHINGTON A ddress: CORD 721 Tow nship: BELPRE Section N um ber: C ity: State: OH Zip Code: IL ocation N um ber: 42 L ocation M ap Y ea n 1981 L ocation A rea: CONSTRUCTION DETAILS [B orehole D iam eten C asing D iam eten 12 in. W ell Use: | A quifer Type: T otal D epth: 57ft. D epth to Bedrock: C asing T hickness: C asing Length: 34ft. Screen Length: D ate o f C om pletion: 4/29/76 D riller's Nam e: LAYNE-OHIO, COLS WELL TEST DETAILS IStatic W ater L evel: 16ft. .wdown: 8ft. T est R ate: 503 gpm T est D uration: 2 hrs. Associated Reports NONE F orm ations BRN CLAY BRN SANDY CLAY SANDY GRAVEL RED SHALE From T o 0 - 14 14 - 34 34 - 56 56 - 57 000362 m M m M WELL INFORMATION - DRIFT WELLS The (aune O hio Com pany -- . - AA nDiiuvii<sioo nn ooff LAYNE-WESTCRN 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 (614)876-1195 Name of Job L i t t l e H o c k in q W a te r & S e w e r Citv or Village L i t t l e H o c k i n q Well N o .: P . W . 5 Drillers: F . W ebb & D . C o l b u r n Well Location: ft. ( ) and ft.< Section , Twp. ( I, Range () Otherwise located as /L d ^ a c e n t t o T . H . 5 a n d T . W . 5 A Date 1 2 - 2 0 - 8 5 State O h io Rig: 4 5 ) of the cornei Cour Work Began: 1 2 --3 --8 5 ____________ Work Completed: 1 2 --1 2 --8 5 Well Depth to Plug: All measurements made from existing ground level at time well was drilled. Casing Record:' 561 Amount 43 43 Dia. 24" 12" Wt. or Thickness .375 .375 Material s te e l s te e l with w eld ed jo in ts from with w e l d e d j 0 jnts from to to Screen Record: Type C o o k with joints from to Amount 15' Dia. .375 Opening Material S .S . with w e l d e d joints from 5 to 1 5 with joints from to Type of Seal at Bottom S . S . P l a t e Hole Record: 2 4" inch from 0 to 5 6 ' inch from to Gravel Pack Record: Amount 4 to n Size J i'x l/8 " Source P a rry G ravel From 56' 000363 To 21' <:PP O T H E R S ID E Feet Feet 0 to 2 0 Brown c la y WELL LOG Description 20 to 2 7 Brown san d y c la y 2 7 to 3 7 Brown c la y w it h c o a rs e to f in e sand 3 7 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& nd f j np sand 4 5 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 ______________ ________ to _ _ _ _ _ _ _ _ to to to to to to to to to to Well Test Data: Static Level 1 8 ' 8 " ; pumping level 3 1 _______ after ^ ^ hours pumping at 4 0 2 Length of te s t____________ hrs. See Well Test Data Sheet Dated____________________________________________ 9-P .n REMARKS: r H 000364 m I >1 I Hf If IQ q q q q Iq r WELL INFORMATION - DRIFT WELLS The (aune O hio C om 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 4921 Vulcan Avenue ' Columbus. Ohio 43228 (6141876-1195 Name of Job L i t t l e H o c k in g City or Village L i t t l e H o c k in g Well No.: T W -1 Drillers: D . H a v e n s Well Location: ft. ) and Section . Twp. i . 600' ( ), Range Otherwise located as ID O 1 s o u t h o f PW # 3 ft.{ () Date 8 / 3 1 / 8 4 State O h io Rig: SR ) of the corner c Count* 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 Record: 551 Amount 50' Dia. Wt. or Thickness Material 3" Sch. 40 P V C with s c r e w joints from to with joints from to Screen Record: Type S lo t .0 1 0 with joints from to Amount Dia. Opening 5 ' 3" .0 1 0 Material PVC with s c r e w 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 HOP# Size #4 Source P arry G ravel From 58* 000365 To 30' LO-6 SEE OTHER SIDE Feet Feet WELL LOG Description Q t o ________5______B r o w n c l a y ___________________________________________________ ______ 5 to 1 0 _______ B r o w n s a n d y c l a y ________________________________________________ 1 0 to 1 5 ______B r o w n s a n d y c l a y , t r a c e s o f g r a y c l a v ________________ 1 5 to 3 2 to 3 2 ______B r o w n s a n d y c l a y , l a y e r s o f s a n d _____________________ 5 3 _______ S a n d a n d g r a v e l ________________________________________________ 5 3 to 5 7 _______ R e d s h a l e , b l u e s h a l e ____________________________________________ ____________ t o ____________ . ____________ t o ____________ ________ _ ____________ t o _____________ _______ _ t o __________________________ ;______________________________________________________ _ _____________ t o _____ |______ ___________________________________________________________________________ _ ____________ t o ________________________________________________________________________________________ __ _______ t o __________________________________________________________________________________________ _____________ t o ________________ ____________ t o ___________________ ______ I_____ to __________________________________________________________________________________________ Well Test Data: Static Level \"1.~J1 ; pumping level I-& -6S ------- ------ after hours pumping at q.p.n --------------- Length of test___________ hrs. See Well Test Data Sheet Dated____________________________________________________ REMARKS: 000366 WELL INFORMATION - D R IFT WELLS The (au n e O hio Com pany A Division of LAYNEWESTERN COMPANY. IN C .' -- .............. 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 (614)876-1195 Name of Job - L i t t l e H o c k in c r City or Village L i t t l e H o c k in g Well No.: TW -2. Drillers: D. Havens Date State Rig: 8 /3 1 /8 4 O h io SR Well Location: ft. ( ) and ft.( ) of the corner Section . Twp. ( ). Range oo' Otherwise located as - 3 0 0 ^ s o u t h o f PW 3 (> Count 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 Record: 551 Amount 50 Dia. Wt. or Thickness Material 3 Sch. 40 PVC with s c r e w joints from to Screen Record: Type S lo t .0 1 0 with with joints from joints from to to - Amount 5* Dia. 3" Opening .0 1 0 Material PVC with s c r e w 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 1300# Size #4 Source P a rry G ravel From To cn CO u> o 000367 Feet Feet *0 to 5 5 to 3 0 3 0 to 5 5 5 5 to 5 8 WELL LOG Brown c la y Description Brown s a n d y c la y , la y e r s o f sand Sand and g r a v e l Red s h a le and b lu e s h a le _____________ tO ______ ' ___________________ ;_________________________________________________________________ _____________ tO _____________ _____________ tO _____________ _______ ;____________ ,________________________ _____________ _ to _ _ _ _ _ _ _ _ _ *i- ______' t o _________________________ ________________________ ______________;______________________________ ____ _____________ tO _____________ __________________________________ _______________________________________________ _____________ t O ____________________________ |___________________________ ' _________________________________ _____________ to \___________________________________________________________________ '________________________ ___________ _ t o _______________________________________________________________________ _ _____________ t o ________________________ ;_____________________________________________________________________ __ ____________ _ t O __________________________________________________________________________ ~_____________________ _____________ tO ' _______ '___________________________________________________________ ________________ _ Well Test Data: Static Level 4 6 . 3 * ; pumping level i- e > - ' after hours pumping at g.p.n Length of test _ _ _ _ _ _ _ _ _ _ hrs. See Well Test Data Sheet Dated________ _____________ _________________________________ REMARKS: 000369 WELL INFORMATION - DRIFT WELLS The lau n e O hio 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 4921 Vulcan Avenue Columbus. Ohio 43228 (614)876-1195 Name of Job L i t t l e H o c k in g Date 8 /3 1 /8 4 ritv nr Village L i t t l e H o c k in g State O h i o Well No.: T \ M - 3 Drillers: Havens Rig: S R Well Location: ft. ( ) and ft.( ) of the corner Section , Twp. ( 1. Range ( Count O therw ise located as 3 0 0 ' w e s t o f e x is t in g w e lls . A lo n g edge o f rig h t-a w a y 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. 40 P V C w ith s c r e w joints from to Screen Record: Type _ S l o t # . 0 1 0 with with joints from joints from to to Amount 5' Dia. 3" Opening #010 Material PVC with joints from to with Type of Seal at Bottom_______ PVC________________________ joints from to Hole Record: ___________ ____________ inch fro m ____________________________ to __________ ._____________ inch fro m _________________ _________ to Gravel Pack Record: Amount 1100# Size # 4 ______ Source P a r r y G r a v e l ____ From 58' 0 0 0 3 69- To 30' Feet Feet WELL LOG Description Q t o ______ 5_______ B r o w n c l a y ____________________ _ ______ 5 to 3 0 _______ B r o w n s a n d c l a y , t r a c e s o f g r a y c l a v 1 0 * - 15_________ 3 0 to 5 5 _______ S a n d a n d g r a v e l _________ ;_____________________________________ 5 5 to 5 8 _______ B l u e s h a l e ____________________________________________________ _ ____________ to ________ ;____________________________ _____________________________________________________ _ ____________ t o ______________________________________ _______________________________________________ _ ____________ t o _____________. ____________ t o ________________________________________ ;__________ |_____________________________ _________ ____________ t o __________ I_____________________________________________________________________________ _ _ _ ____________ t o __________________________________________________________ ;_______________________________ _ ____________ to______________________________ .___________________________________ i__________________ _ ____________ t o ____________________________________________________________________________ ___________ ' ____________ to ____________ '_________________ _______ ' tO ______________________ ;____________________________________________________________________ ___________ tO ____________ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _____________ tO _______ .____________________________________________________________________________________ Well Test Data: Static Level 3 - 0 . I* ; pumping level i-,-e> -------------- Length of test___________ hrs. See Well Test Data Sheet Dated after hours pumping at ` ------- a.P.m. ____________ REMARKS: 000370 WELL INFORMATION - DRIFT WELLS m I m i 4 4 4 4 4 * 4 4 i The aune O hio 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 4921 Vulcan Avenue Columbus, Ohio 43228 (614)876-1195 Name of Job L i t t l e H o c k in g Date 8 / 3 1 / 8 4 C ity or Village__ L i t t l e H o c k in g Well No.: ~TW-A- Drillers: D . H a v e n s State O h i o Rig: S R Well Location:^ ft. (_____ ) and ft.( i of the Section ______ ,T w p . (_____ ). Range () Otherwise located as 3 0 0 ' w e s t o f e x i s t i n g w e l i s a l o n g e d g e o f r i g h t - a w a y corner of County. ______ s o u t h o f W e l l N o . 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 Dia. Wt. or Thickness Material 5 4 ' 3" Sch. 40 PVC with s c r e w ioints from to with joints from to Screen Record: Type S l o t # 0 1 0 PVC with ioints from to Amount 5' Dia. 3" Opening .010 Material PVC With s c r e w ioints from to with ioints from to Type of Seal at Bottom PVC Hole Record: l* r I Gravel Pack Record: Amount 1100# inch from inch from Size #4 to to Source P a rry G ravel From To 58 30 00037T Feet Feet *0 to 5 5 to 1 0 1 0 to 15 1 5 to 30 30 to 5 4 54 to 5 8 to to to to to to to WELL LOG Brown C la y Description Brown sandy c la y Brown san d y c la y , tr a c e s o f a r a v c la v Brown sandy c la v # t r a c e o f sand Sand and crravel B lu e s h a le to to Well Test Data: Static Level ; pumping level Length o f test hrs. See Well Test Data Sheet Dated REMARKS: after hours pumping at . g.p.m. 000372 WELL INFORMATION - DRIFT WELLS The [aune O hio 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 4921 Vulcan Avenue Columbus, Ohio 43228 (614)876-1195 Name o f Job L i t t l e H o c k in g S e w e r & W a t e r ______________________ Date 1 1 / 2 / 8 4 C ity or Village L i t t l e H o c k in g Well N o.: TW ~S Drillers: D . H a v e n s ________________ State O h i o . Rjg: R o t a r y Well Location: _____ f t . (_____ ) a n d ________________ f t .( ______) o f t h e ________________________ corner of Section __________ , T w p . ___________ (______ ), R a n g e _____________ (______ ) __ _________________________________________ County. O therw ise located as 300* w est O f T . H . #3 ___________________________________________ W ork Began: 1 0 / 3 0 / 8 4 _________ Wo rk Com pleted: 1 0 / 3 0 / 8 4 We|| Depth to Plug; A ll measurements made fro m existing ground level at tim e w ell was d rilled . Casing Record: 56* Amount 51' Dia. Wt. or Thickness Material 4" 40 PVC with ioints from to with oints from to Screen Record: Type D ie d ric h with oints from to Amount 5' Dia. 4" Opening .0 1 0 Material PVC with ioints from to Type of Seal at Bottom Hole Record: 7 7 /8 PVC p lu g - inch from 0 with ioints from o to to to inch from to Gravel Pack Record: Amount 1500# Size l/8 x l/4 Source S m ith C o n c re te From 30' To 56' 0003*73 Feet 0 28 to to Feet 28 32 WELL LOG W ashed S am ples Brown c la v . s t i f f Brown Sandv c la v Description \ 32 to 38 to 41 to 5 6 to to 32 to 37 to 38 to 39 to 42 to 42 to 39 41 56 60 34 38 39 42 44 47 Brown san d v c la v . s o f t G ray s a n d , tr a c e s o f c la y (m ore c la y ) Sand and q r a v e l, f in e sand G ray s h a le Spoons S and, tra c e s o f c la y , brow n Brown s a n d , tr a c e s o f c la y G ray san d , tra c e s o f c la y Washed Sand and q ra v e l Washed 47 to 49 47 to 52 52 54 54 to 56 Sand and q ra v e l W ashed Sand and g ra v e l Washed Well Test Data: -a -e > s Length o f test Static Level ; pumpinq level hrs. See W ell Test Data Sheet Dated after hours pumping at REMARKS: g.p.m. x 000374 WELL IN FO R M A TIO N -D R IFT WELLS b*. The (aune O hio 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 4921 Vulcan Avenue Columbus, Ohio 43228 (614)876-1195 Name of Job L i t t l e . l o c k i n g S e w e r 6 W a t e r City or Viilage L i t t l e H o c k in g Well No.: TW "b Drillers: D . Havens Well Location: ft. ( ) and Section . Twp. ( ). Range ( Otherwise located as 3 0 0 * w e s t O f T . H . 1 4 ft.( ) Date 1 1 / 2 / 8 4 State O h io Rig: R o t a r y ) of the corner of Countv. Work Began: 1 0 / 3 1 / 8 4 ______ Work Completed: 1 0 / 3 1 / 8 4 Well Depth to Plug: All measurements made from existing ground level at time well was drilled. Casing Record: 56 * Amount 51' Dia. Wt: or Thickness Material 4" 40 PVC with joints from to with joints from to Screen Record: Type D i e d r i c h with joints from to Amount 5' Dia. 4" Opening .0 1 0 Material PVC with joints from to Type of Seal at Bottom PVC p lu g with joints from to Hole Record: 7 7 /8 inch from 0 to 6 0 ' inch from _________________________ to Gravel Pack Record: Amount 1500 Size l/8 x l/4 Source S m ith C o n c re te From To 30' 56' 000375 LO-6 SEE O TH E R SIDE WELL LOG Feet Feet Description 0 to 1 6 _________ B ro w n c l a y , s t i f f _________________________________________________ 1 6 to 3 6 _________ B ro w n s a n d y c l a y w i t h t r a c e s o f g r a y c l a y _______________ 3 6 to 4 2 ________ S a n d a n d g r a v e l ( s m a l l ) __________________________________ 4 2 to 5 6 _________ S a n d y som e s m a l l g r a v e l ( m o s t l y s a n d )______________________ 5 6 to 6 0 G r a y s h a l e _______________________________________________________________ _____________ t o _____________ _ _____________to _ _ _ _ _ _ _ _ _____________ t o _____________ _______________________ _____________ t o ________________ _____________ t o _________________________________________________________________________________________________ _____________ t o _______ ._____________________________ _____________ t o _________________________________________________________________________________________________ _____________ t o _________________________________________________________________________________________________ t o _____________ __________________________________________________________________________________ _____________t o __________________.______________________________________________________________________________ ____________ to '_________________________________________________________________________________ _ _ I _ 11 Well Test Data: Static Level l b ; pumping level after hours pumping at g.p.m. -------**-- ------------- ------- --------------- Length of te s t___________ hrs. See Well Test Data Sheet Dated_____________________________________________ _ REMARKS: 00396 WELL INFORMATION - DRIFT WELLS The faune O hio Com pany \ A Division of LAYNE-WESTERN COMPANY. INC. ............. - . W A T E R SUPPLY SERVICES WATER WELLS LAYNE PUMPS TEST DRILLING WATER TREATMENT EQUIPMENT 4921 Vulcan Avenue Columbus. Ohio 43228 1614)876-1195 Name of Job T.i t t l e H o c k i n a W a t e r & S e w e r i C ity or Village T .i t t l e H o c k i n a Date 1 1 - 2 5 - 8 5 State O h i o i Well N o.: q Well Location: Drillers: n . L . H a v e n s ft. ) and Rig: R o t a r y ft.( ) of the corner of Section . Twp. ( }, Range (> C o u n ty . O therw ise located as 2 0 0 - 3 0 0 ' n o r t h w e s t o f P W 1 Work Began: 1 1 - 1 9 - p Work Completed: 1 1 - 1 9 - 8 5 Well Depth to Plug: 5 6 ' All measurements made from existing ground level at time well was drilled. Casing Record: Amount 53' Dia. Wt. or Thickness Material 6" 40 P .V .C . with g l u e joints from 5 1 ' with joints from to 1 1 ' to with joints from to Screen Record: Type C o o k Amount Dia. Opening Material U > ft 5 ' 6" 010 with joints from to with joints from to Type of Seal at Bottom P . V . C . c a o Hole Record: - 8% inch from 0 to 5 6 1 inch from to Gravel Pack Record: Amount 600 lb s . Size #4 P e rry Source From To 5 6 ' mrr1r8 Feet 0 fl 1 ft 2R 3fi 5 6 __ to to to to to to to Feet 8 18 28 38 ___ WELL LOG Description H ard brow n c l a y , 5000 l b s . P .D . M ed. to h a rd brow n sandy c l a y , 0 -1 0 0 0 P .D . S o f t sandy brow n c l a y , 0 P .D . Sandv s i l t and s o f t brow n c l a y , 0 P .D . Sand and c rra v e l, 0 P .D . G rav s h a le to to to to to to to to to Well Test Data: Static Level ; pum ping level after hours pumping at Length of test hrs. See W ell Test Data Sheet Dated REMARKS: B&N c o l l e c t e d w a t e r s a m p le s a n d w a t e r s t a t i c l e v e l s P . D . = P u l l Down on d r i l l b i t ... _ g .p .m . 000378 Reynolds Supply, Inc. COMPLETE MUNICIPAL & INDUSTRIAL WATER SYSTEMS FORMATION LOG OF WELL S ta rtin g D a . . ______ W 1 T TM Finished O w .p r l i t t l e h o c k i n g w a te r d i s t r i c t U c < tio ,, 10/27/87 W ell N um ber Test Hole 10 TOTAL DEPTH - 5 ft. 5-10 ; - 15 1 5 -2 0 : - 25 25 - 30 : ` - 35 - AO AO - A5 1 50 50-53 53 THICKNESS EACH STRATUM 5 ft. . 5_________ 5' ....... - 5 - - 5 5 5 5 5 '5 3 . FORM ATION 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 `* 11 -- :------------------- :-------------------------------------------------'t-Jc Water Level ________________________ :_____________ L_______ Draw Down ----------------- . \ ... ^ Reynolds Supply, Inc. COMPLETE MUNICIPAL & INDUSTRIAL WATER SYSTEMS F O R M A T I O N LOG OF V/ELL `tartina Date -LQ Z 27/97 Finished 10/27/87 w , or L IT T L E HOCKING WATER DISTR IC T Location .Well Number T e s t H ole 11 TO TAL DEPTH < - 5 ft. 5-10 J - 15 15-20 '2 - 25 2 , - 30 3~ - 35 3 -kO kO - hS ^ 50 50 - 55 5 - 60 6 U r 63 '3' T H IC K N E S S EACH STRATUM 5 ft. 5 . 5 5. 5 5 5. 5 5 5 5 5 3 FORM ATION Sandy-Jrnpsni 1 and clay Sandv s i l t and clav Sandy clay Sandy clay Sandy clay Sand (wet) Clean sand and qravel Coarse clean sand and gravel Coarse sand and gravel Coarse sand and gravel Coarse sand and qravel Fine sand and qravel Fine Sand Red rock - red clav [ [ \ i tai W a te r L evel . ' . * % - 11 Draw Down * Reynolds Supply, Inc. COMPLETE MUNICIPAL & INDUSTRIAL WATER SYSTEMS FORMATION LOG OF WELL Starting Date 10 / 2 8 / 8 7 ______________ Finished 10 / 2 8 / 8 7 _____________________ We|, N,,mh,,r TEST HOLE 12 f W w L IT T L E HOCKING WATER D IS T R IC T Location ________________________________ ______________ i N> lh 1l wO Oo TOTAL DEPTH THICKNESS EACH STRATUM 0 - S ft. 5 ft. 5 i n - is ' IS - 20 5 5. >0 - 2S ______ __________ 5_________ _ 3Q- i _ 3 5 _______ 5 . ;______ itO - k 5 - 50 50 - 55 55-59 5_________ _______ 5__ ' 5 5 .k 59 Tod S o il Sandy c la y Sandy c la y Sandy c la y Wet sandy c la y Wet Sandy cl ay Coarse sand and g ra v e l Coarse sand and g ra v e l Coarse sand and q r a v e l Coarse sand and q ra v e l Coarse sand and g ra v e l F in e sand and g ra v e l Bedrock F O R M A T IO N -Odi LP 1 * : * i . ii C ii aual 000381 rv