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.e California stegional Water Qualit�ontrol Board <br /> Central Valley Region <br /> Peter M.Rooney Sacramento Main Office <br /> Ed J.Schnabel <br /> Secretwy.for ntcmct Address: http://www.swrcb.ca.gov/-iwgcb5/home.html Chair <br /> Environmental 443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Protection Phone(916)255-3000-FAX(916)255-3015 <br /> TO: Gordon L. Bos FROM: Mark R. List <br /> UST Program anager Engineering Geologist <br /> DATE: 21 Septem r 1998 SIGNATURE: / c� <br /> SUBJECT: FILE REVIEW FOR CLOSURE CONCURRENCE,DELTA PACKING CO., <br /> 5950 E. KETTLEMAN LANE,LODI,SAN JOAQUIN COUNTY <br /> At the request of the San Joaquin County Environmental Health Division(SJCEHD), a file review was <br /> completed to determine if Regional Board staff agree with the SJCEHD determination of no further <br /> action required at this site. This information was obtained during my review of the Regional Board <br /> casefile, and the SJCEHD casefile for the Delta Packing Company site. <br /> Background: <br /> On 18 January 1990 two underground storage tanks (USTs),one 8000-gallon unleaded gasoline and one <br /> 500-gallon regular gasoline, were removed from the site. Soil samples collected at the east end of the <br /> 500-gallon UST detected elevated concentrations of TPHg,ethylbenzene and xylenes. The following <br /> concentrations of contamination were detected: <br /> Contaminant: Concentration: <br /> TPHg 15 ppm(mg/Kg) <br /> ethylbenzene 11 ppm <br /> total xylenes 20 ppm <br /> On 24 April 1998, one soil boring was drilled to 55 feet below ground surface (bgs), near the former <br /> 500-gallon UST. No odor or soil discoloration were noted during drilling activities. The analytical <br /> results of soil samples did not detect elevated concentration of TPHg, BTEX, or oxygenates in any soil <br /> sample. <br /> The only contamination detected at the site was encountered in soil below the former 500-gallon UST. <br /> This soil contamination does not appear to be present below approximately 11.5 feet bgs. Groundwater <br /> was not encountered during the soil boring investigation. There is no know impact to groundwater at the <br /> site. Based on the information reviewed, the contamination related to the UST release at this site does <br /> not appear to pose a significant threat to water quality. <br /> California Environmental Protection Agency <br /> Ca Recycled Paper <br />