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June 14, 1990 <br /> Job No. 203 175 3289 <br /> E <br /> f <br /> ADDENDUM' TO SOIL AERATION AND SAMPLING <br /> FOR FORMER..CHEVRON SERVICE STATION NO. 9-0342 <br /> E <br /> A program of.. -soil- aeration and .sampling for laboratory <br /> analyses of TPH-as=gasoline, BTEX EDB and Pb (Title 22, CAM) has <br /> been undertaken and is continuing, In accordance with <br /> Groundwater Technology, inc. 's work plan for soil excavation and <br /> preliminary . assessment of 'November, 1989 (approved by the. San <br /> Joaquin County- Health Services Department) , and the Soil <br /> Remediation Proposal of. May 14 , 1990, Soil Pile 3 (former Pile A) <br /> has been sampled and found. to be below detection limits for TPH- <br /> as-gasoline (at a minimum detection level of - 1 ppm) . See the <br /> enclosed figure . for laboratory analyses results of samples <br /> collected on May 23 ' 1990. <br /> Laboratory analyses for lead of all samples collected on May <br /> 23 , 1990, were belo_ w .13 ppm. for lead (Title 22 , CAM test) . <br /> AdditionallY. Y.anal ses. for EDB and for benzene were below <br /> detection. levels (with a .minimum detection level of 0. 2 ppm and <br /> 0. 005 ppm, respectively).. All laboratory analyses for the two <br /> samples collected from soil pile3 .(3-S and 3-N) were below <br /> detection levels. See the enclosed copy of laboratory results. <br /> SCHEDULE <br /> DATE SOIL PILE I _ SOIL "PILE 2 SOIL PILE 3 <br /> i <br /> (FORMER PILE B) (FORMER PILE B) (FORMER PILE A) <br /> F _ <br /> E 6/15 Turn/Spread Turn/Spread Backfill if <br /> (except NE area) possible <br /> E 6/18 Sample (TPH�as- Sample (TPH=as- Backfill if <br /> gasoline) . gasoline) possible <br /> Turn/Spread' Turn/Spread <br /> 6/22 Turn/Spread Turn/Spread Backfill if <br /> possible <br />` 6/25 Turn/Spread Turn/Spread <br /> GROUNDWATER <br /> ❑ TECHNOLOGY,INC. <br />