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r <br /> 15634 STEINEGUI.,ESCALON <br /> RAYMOND GREER PROPERTY <br /> PAGE 2 <br /> According to figures prepared by WHF, the apparent direction of groundwater flow at the <br /> site has been to the south and southeast. However, the possible distorting effect of the <br /> pumping well was not considered when constructing the potentiometric surface maps used <br /> as figures in the report. The effect of the pumping well might account for the sharp decline <br /> in depth to groundwater that is centered at the domestic well. If the potentiometric surface <br /> maps are redrawn to include the effect of the pumping well,the general flow of groundwater <br /> appears to be to the northeast. Thus, it becomes likely that the pumping well is drawing the <br /> groundwater(and thus,the groundwater plume) locally toward itself. <br /> According to the water well driller's report, the total depth of the domestic well is 215 feet <br /> bsg with a screen interval beginning at 195 feet bsg and continuing to depth. Roofing gravel <br /> was used to pack the well from 50 feet to 215 feet bsg, and bentonite was used from surface <br /> to 50 feet bsg. Petroleum hydrocarbon contamination has not yet been detected in water <br /> samples collected from the domestic well. Nonetheless, as described above,the well may be <br /> influencing the direction of groundwater flow and pulling the contamination plume to the <br /> southeast. <br /> WHF has installed three vapor extraction wells for the purpose of evaluating the feasibility <br /> of soil vapor extraction as a remedial alternative. PHS/EHD has not received a work plan <br /> for this feasibility test to date. Submit a work plan that will evaluate soil vapor extraction as <br /> well as other remediation alternatives for the soil and groundwater contamination to <br /> PHS/EHD by October 26, 2001. <br /> If you have any questions please contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> Jeffrey Wong, REHS Dot Lofstrom,RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> C: CRWQC:B,Central Valley Region- Marty Hartzell <br /> G WHF,Inc.- Bill Fox <br />