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CalifornVegional Water Quality Co- '--ol Board Central Valley Region z, Karl E. Longlcv. ScDC. P.E..Chair Linda S.Adams Arnold Secre�u,.rjor Sacramento Main Office Schwarzenegger Environmental 11020 Sun Center Drive#200.Rancho Cordova,California 95670-6114 c 1e � r Prronmen Phone(916)464-3291 •FAX(916)464-4645 http:/h+�vw waterboards.ca.gov/centralvalle}' To: Wendy Cohen FROM: Kristi Shelton Senior Engineer Water Resources Control Engineer Aboveground Tanks Cleanup Unit Abovegro nd Tanks Cleanup Unit DATE: 23 October 2007 SIGNATURE: SUBJECT: STATUS UPDATE ON VOLPI FARM PROPERTY, STOCKTON, SAN JOAQUIN COUNTY I reviewed the 31 March 2006 Closure Summary Report prepared by Advanced GeoEnvironmental, Inc. (AGE) on behalf of Ms. Nancie Volpi of Volpi Farm Properties (Volpi) for the property at 14210 West State Route Four, in San Joaquin County (Site). The report outlines the site assessment activities and recommendations for site closure. The site history and Volpi rationale for issuing a No Further Action Required letter are summarized below; BACKGROUND Volpi leased the Site from Mr. Whiting Welch from about 1938 until 1998. Mr. Welch constructed the dispensers and aboveground tanks (AGTs) at the Site that Volpi used for the farming operation. Mr. Welch passed away in 1997 and his heir, Mrs. Barbara Cook, sold the property to Mr. Herbert Speckman. Volpi and the Welch estate agreed to share the costs of environmental cleanup at the Site. Monitoring and Reporting Program (MRP) No. R5-2002-0838 lists the dischargers as Volpi, Welch Estate, and Mr. Speckman. The Site is in an agricultural region about 13 miles west of Stockton on Highway 4. Two maintenance buildings are shown on the attached Site Plan (Attachment 1). An irrigation ditch runs along the southern portion and one domestic well is north of the Site. Two AGTs were in operation at the Site. A 7,500-gallon diesel AGT was formerly on the eastern edge of the maintenance compound and a 1,000-gallon gasoline AGT was near the center of the maintenance compound. In September 1999, Volpi removed the AGTs and dispenser. TRENCHING AND EXCAVATION ACTIVITIES Site investigations showed three areas of concern: the area around the 7,500-gallon diesel AGT that appeared to be leaking fuel from the dispenser onto the pad; the 1,000-gallon gasoline AGT with a portion of its system lines buried; and an area used for waste oil handling and possibly disposal. In July 1998, Volpi performed trenching in the areas of concern to determine if hydrocarbon releases had contaminated soil and groundwater at the Site. About 52.5 tons of contaminated soil were removed from the four trenches, and groundwater was encountered in two of them at about eight feet below ground surface (bgs). Trench T1 was next to the 1,000-gasoline AGT, trenches T2 and T3 were near the south side of the Site in California Environmental Protection Agency prp� Recycled Paper