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California Agional Water Qualit�kontrol Board - <br /> Central Valle Region <br /> Steven T. Butler, Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> TO: Files FROM: Gail Wiggett <br /> Aboveground Tanks Program <br /> DATE: 10 August 1999 SIGNATURE: alp/ <br /> SUBJECT: VOLPI FARMS, 14210 WEST STATE ROUTE FOUR, STOCKTON: REVIEW OF <br /> WORK PLAN FOR ADDITIONAL SITE INVESTIGATION AND REMEDIATION <br /> I have reviewed the work plan submitted by Advanced GeoEnvironmental, Inc. (AGE) on behalf of <br /> Volpi Farms for further investigation at this site. This memo presents my comments, and is based on a <br /> site visit in late summer 1998, telephone conversations with the consultant, and review of the work plan. <br /> SITE CONDITIONS: The site is in San Joaquin County, in the area of influence of the San Joaquin <br /> Delta. The nearest significant natural water course is the Middle River, about 500 feet south of the site. <br /> This river drains into the San Joaquin River and is thought to be tidally influenced. Adjacent to the <br /> south side of the site is a ditch that appears to be used for irrigation purposes. In the summer of 1998, <br /> when I visited the site, the field next to the ditch supported row crops. Whether the ditch is full of water <br /> year-round, its depth, and its relationship to groundwater(gaining or losing) are not known. <br /> Groundwater flow direction is unknown, but is expected to be variable. The site has a water supply well <br /> whose current usage and construction are unknown. <br /> The site has an aboveground gasoline tank and an aboveground diesel tank, both now decommissioned. <br /> The gasoline tank is housed in a building on the site's south side, near the irrigation ditch. Underground <br /> piping associated with the gasoline tank is known to have leaked, and the initial site assessment work led <br /> to removal of some contaminated soil on the west side of the building. The 7500-gallon diesel tank had <br /> a leaky dispenser. Contaminated soil was dug out from the dispenser area during summer 1998. Motor <br /> oil is stored on-site in a building on the site's north side. No unusual concerns were noted in this <br /> building during my site visit. An additional potential source of contamination consists of a truck wash <br /> area on the site's south side, adjacent to the ditch and on the immediate east side of the gasoline tank <br /> building. This area had soil staining, water, and drainage patterns suggesting potential flow to the ditch. <br /> Surficial soils at the site, probably disturbed, are fine to medium sands containing Corbicula shells. The <br /> site is near a levee. <br /> CONSTITUENTS OF CONCERN (COCs): In July 1998, soil and water sampling from several <br /> backhoe trenches found impacts from total petroleum hydrocarbons as diesel, as gasoline, and as motor <br /> oil (tph-d; tph-g; and tph-mo), from gasoline constituents (benzene, toluene, ethylbenzene, xylenes or <br /> BTEX), and MtBE. The attached Table 1 and map from the work plan show analytical results to date <br /> and locations of samples. <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br />