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Dordrecht Works C-8 Sampling Summary-Revision 1
Groundwater Sampling Results
la r c h 2003
AR226-262
Revision 1
Note: Revision 1 of the Dordrecht Works March 2003 sampling event summary was prepared based on new well constriction information received in June 2003. This new information changed the observations presented on the "Second Aquifer" in this document.
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Scope of Work Summary
24 samples were collected on March 10-12, 2003, including:
- 1 8 site monitoring wells (most previously sampled in mid 1990's). Two water bearing zones: freatic and first aquifers. No samples were collected from deeper, "second" aquifer.
- 1 site tapwater (local "city" water)
- 1 from "Spaarbekk" or "Drinkwaterbekken" reservior
- 2 from groundwater treatment system (combined influent and effluent)
- 2 from site wastewater treatment plant (sweetwater
Analytical Results (in ug/L)
| Sam ple ID
| Date I C-8 (ug/L)
MW-315 MW-N10-2
3/10/2003 3/10/2003
71.3 ............................. ' 15
MW-N23-1
3/10/2003
.............5.5"
MW-N28-1
3/10/2003
14.4
GW Treatment 103
3/11/2003
9.18
W aste Treatment 82
3/11/2003
3,89(3
GW Treatment 401
3/11/2003
7.91
W aste Treatment 80
3/11/2003
4,850
Spaarbekk
3/11/2003
0.439
Tap W ater
3/11/2003
0.0736
MW-119
3/11/2003
158
MW-303
3/11/2003
.....7,430
MW-05A
3/11/2003
................... 6.1
MW-N26-1 .........
3/11/2003
......... 16 1
MW-N25-1
3/11/2003
3.99
MW-308
........
3/11/2003
.... ......131'
MW-W02-A
3/11/2003
........................... 14.7
MW-314
3/11/2003
5072
MW-118 ..........
3/11/2003
34^9
MW-N17-1 .. .................
3/11/2003 : "......... ....... 7T39
MW -N19-
3/12/203 ........... ....' ".. ....... 0.762
M W -311
3/12/2003
354
MW-316 MW-317
.. ..... .. .3/1272003.... ...f......................... 1530 ..............3/12/2003 " T ~ " ...... ... 2890
Dordrecht Sampling 2003 Page 4
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June Analytical Result/MF-11 . June Sampling Result, MF-11= 29.5 ug/L (First Aquifer)
* Well is situated near southern end of site near edge of "Drinkwaterbekken" reservoir.
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Results Discussion
Elevated levels found in Waste Treatment 82-Sweetwater (3890 ug/L) and Waste Treatment 80-Saltwater (4850 ug/L). - Based on flow of approximately 500,000 gal./day, this represents discharge of approximately 7,300 lbs/year.
Highest groundwater measurement 7430 ug/L in MW-303, a well completed in shallowest water bearing zone, "freatic layer" ("Ophooglaag"). Slightly higher than Aug. 1995 measurement of 1700 ug/L. Other shallow wells near this site location MW-316 (1530 ug/L) and MW-317 (2890 ug/L).
Range for shallow water bearing zone is 34.9 ug/L (central site) to 7430 ug/L, north site, near river.
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Results Discussion
Concentrations in first aquifer "Eerste" range from .139 to 16.1 ug/L.
Overall, 2003 measured concentrations are higher than mid 90's sampling events.
Spaarbekk Reservior .439 ug/L. Water used by site for non-contact cooling. Also used for water sports/recreation.
Groundwater treatment system influent, GW Treatment 103 was 9.18 ug/L and effluent, GW Treatment 401, was 7.91 ug/L.
Site "Tap Water" was .0736 ug/L. Source is "city water".
Site Conceptual Model Summary
Areas of impact and groundwater flow directions
Dordrecht Sampling 2003 Page 10
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Site Conceptual Model
Primary source area (I.e., C8 and chlorocarbons) is freatic (shallow) aquifer underlying FP process area. This area of impact is contained by a sheet-pile cut-off wall and a Groundwater Pump & Treat system. Treatment is air stripper (no affect on C-8). First aquifer is also pumped to maintain inward groundwater flow gradient. Second aquifer receives "Pumped Infiltration" to establish higher pressures (upward gradient) and prevent first aquifer from flowing vertically downward to second.
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