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M _ � _yN .PRAw•.'sF:.Z� � .1 _ � �dw'. 1 <br /> F <br /> vironmental Investigation July 16, 1990 <br /> rvice Station No. 6100, Tracy, California AGS 30041-1 <br /> 1be results of this investigation indicate that soil underlying the existing and proposed tank <br /> cavities contains hydrocarbons in concentrations warranting remediation. If the <br /> hydrocarbon-bearing soil is not effectively removed from the existing tank cavity during tank <br /> replacement, the San Joaquin Public Health Services {SJPHS} will require a Letter of <br /> Commitment from ARCO specifying dates of submittal for a Soil Contamination Workplan <br /> and a Soil Remediation Proposal (or a Preliminary Report if ground water has been <br /> affected)before authorizing installation of underground-forage tanks in a new tank cavity. <br /> In addition,the SJPHS will require a Soil Excavation Workplan before authorizing removal <br /> of hydrocarbon-bearing soil from the interval deeper than 4 feet beloS'.' the base of the <br /> existing tank cavity. <br /> According to verbal communications between personnel of the SJPHS and Applied <br /> GeoSystems, the SJPHS will authorize installation of the tanks in the proposed tank cavity <br /> is in place and hydrocarbon-bearing soil is effectively <br /> providing the Letter of Comm; <br /> removed. If detectable concentrations of hydrocarbons are present in soil at the limits of <br /> the proposed cavity, the SJPHS may authorize installation of underground storage tanks <br /> after receiving the Letter of Commitment and reviewing results of laboratory analyses. <br /> We recommend that a copy of this report be forwarded to Ms. Laurie Cotulla of the <br /> Environmental Health Division of the San Joaquin Public Health Services . P.O. Box 2009, <br /> Stockton, California 95201. Please call if you have questions regarding the information in <br /> this report. <br /> j <br /> Sincerely I <br /> Applied GeoSystems <br /> Eloise K. Prick ' <br /> Project Geologist <br /> Enclosure: Report of a Limited Subsurface Environmental Investigation <br /> 7 <br /> i <br /> A�,Jy J <br /> 1 <br /> i <br /> t <br /> i <br />