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15634 STEINEGUL ROAD <br /> PAGE <br /> PHS/EHD staff also noted the existence of a septic tank on the premise. PHS/EHD <br /> recommends checking Figure 2 for accuracy, and that the septic tank properly located <br /> be included in the maps of all future reports. <br /> Soil& Groundwater Investigation Interim Report recommended installing a soil vapor <br /> extraction well in order to conduct a pilot study to determine the feasibility of soil <br /> vapor extraction alternative remediation. PHS/EHD recommends additional soil <br /> vapor extraction wells be installed in the upcoming work. A more aggressive approach <br /> to mitigate the contamination should be considered due to the close proximity of the <br /> plume to the domestic well on site and the fact that there is only 50 feet of bentonine <br /> seal around the casing of the domestic well. PHS/EHD strongly recommends the <br /> maximum and most urgent effort in the investigation and remediation of this site to <br /> prevent contamination of the domestic well. <br /> A work plan that will install vapor extraction wells and also define the vertical and <br /> horizontal extent of the contamination previously discussed in a letter dated May 28, <br /> 1999, should be submitted to PHS/EHD no later than September 20, 1999. Work <br /> should commence no later than October 31, 1999. Please be advised that once the <br /> vertical and horizontal extent of contamination has been defined a Corrective Action <br /> Plan must be submitted that has a feasibility study of at least two remedial alternatives <br /> and that contamination both above and below the groundwater must be addressed. <br /> If you have any questions please feel free to contact Jeffrey Wong at (209)468-0335. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> i <br /> Jeffry RENS — MargaretTagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> C: CRWQCB, Central Valley Region-Mark List <br /> C: BSK& Associates-John C. Pfeiffer <br />