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California R-uional Water Quality Vontrol Board -� <br /> Central Valley Region <br /> �,.. <br /> Peter M.Rooney Sacramento Main Office <br /> SecretaryJor Internet Address: http://www.swrcb.ca.gov/-rwgcb5lhome.html Ed J.Schnabel <br /> Environmental 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Chair <br /> Protection Phone(916)255-3000•FAX(916)255-3015 <br /> TO: Gordon L. Boggs FROM: Mark R. List <br /> UST Program Manager Engineering Geologist <br /> DATE: 21 December 1998 SIGNATURE: <br /> SUBJECT: FILE REVIEW FOR CLOSURE CONCURRENCE, WILLIAM BURKHARDT SITE, <br /> 5154 HOGAN 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, for the William Burkhardt site. <br /> Background: <br /> On 8 May 1986, one 350-gallon diesel fuel underground storage tank (UST) and one 550-gallon gasoline <br /> UST were removed from the site, and the excavations were backfilled. The UST area was again <br /> excavated and sampled on 24 November 1992. Soil discoloration and odor were noted in the gasoline <br /> UST, and the samples revealed contamination. <br /> On 21 September 1995, approximately 40 cubic yards of soil was overexcavated from the UST area. <br /> Confirmation soil samples collected from the gasoline UST excavation revealed elevated TPHg and <br /> TEX contamination. To define the extent of soil contamination, four soil probes were advanced to 40 <br /> feet below ground surface(bgs) and samples collected. Soil samples collected from P1, advanced <br /> through the former tank location, revealed low levels of soil contamination and samples from P2, P3 <br /> and P4 were non-detect for all analytes. <br /> On 7 May 1998, one soil probe, located 10 feet west of the UST excavation, was advanced to 40 feet <br /> bgs, and one groundwater sample was collected from the on-site domestic well. The analytical results of <br /> the soil and groundwater samples were non-detect for all analytes. Depth to groundwater was measured <br /> at approximately 60 feet bgs. <br /> Summary: <br /> Soil samples revealed low concentrations of petroleum contamination in the vicinity of the former UST <br /> location. Advanced Geo-Environmental estimated 11.4 gallons of gasoline remains in approximately <br /> 19.5 cubic yards of soil. There is no evidence of groundwater impact below this site, and the remaining <br /> soil contamination does not appear to threaten water quality. Concurrence with the SJCEHD No Further <br /> Action Required decision appears warranted. <br /> California Environmental Protection Agency <br /> Cd Recycled Paper <br />