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Larry's Auto Page 2 <br /> 308 North Grant Street April 16, 2010 <br /> Stockton, California 95202 <br /> collection of the dissolved oxygen measurements. Submit the oxygen measurements and <br /> other information to the EHD by June 1, 2010. In the interim, continue operating the SVE <br /> system since data supports the system's effectiveness for removing soil contamination at this <br /> site. <br /> The EHD has reviewed the groundwater data from the most recent sampling event performed <br /> in July 2009. Benzene was reported at 31,000 micrograms per liter (Ng/L) and total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g) was reported at 110,000 pg/L in groundwater <br /> collected from monitoring well MW-5. This well is located inside a building, which raises the <br /> concern that intruding vapor from the petroleum hydrocarbon plume may be adversely <br /> affecting the health of the workers occupying this building. The EHD directs that soil vapor <br /> samples be collected, not only in the area of MW-5, but also throughout the site where known <br /> contamination is present. Submit a work plan to the EHD by June 1, 2010, for the collection of <br /> soil gas samples to evaluate the potential threat from vapor intrusion. <br /> Feasibility studies submitted so far have focused on mitigating petroleum hydrocarbon <br /> contamination in the area where former underground storage tanks (USTs) identified as Tank <br /> A, containing gasoline, and Tank D, containing waste oil, were removed; however, high <br /> concentrations of contaminants of concern have been detected in the area where two USTs <br /> identified as Tank B, containing gasoline, and Tank C, containing diesel, were removed. This <br /> area of petroleum hydrocarbon contamination must also be addressed. The EHD directs the <br /> submittal of a feasibility study by July 16, 2010, to identify a remedial technology capable of <br /> mitigating petroleum hydrocarbon contamination near monitoring wells MW-4 and MW-8. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-9852 or by e-mail at <br /> vmccartney a)sicehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS 4 Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. William R. Little, PG, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />