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-� •� '.,� - �, sml <br /> ij <br /> Ip <br /> SITE ASSMM1=NT P.EPORT <br /> lip <br /> CHEVRON SAY€CE STATION NO.9-0537 <br /> 139 SOUTH CENT <br /> STOCKTON,CALIFCJ�NtA . <br /> APRIL 1991 <br /> I� <br /> r: IMODUCTION <br /> I.is This report presents the results of Sita assessment activities pe'formed by Groundwater <br /> at Chevron Serv!ce Station No.9.0557 In Stockton,California(Figure 1). The work was <br /> Technology,Inc. evron <br /> E a performed under release number 260-824()ouuth Cent bStreet,on the northweyM. r.Clint Rodgars of st omer of the Intersection of <br /> r <br /> (Chevron!. This site is located at 13 <br /> South Center Street and Washington Street In Stockton,California. The puns irpose g he assessment <br /> beneath <br /> possible occurrence of dissolved-gasnllne hydracarbo <br /> { r to irvesttgate the 1� ng wells on the perimeter <br /> the site. This assessment ineluded the Installation of four <br /> samples,and preparation of this <br /> € I of the site,the collection and analyses of soil and groundwater <br /> performed in accordance with guidelines established <br /> report. The installation of the monrioring wells was pe 1 <br /> f a by the San.Joaquin County Public Health Department,Environmental Health Divislon(SJCEHD). <br /> SACKaROUND <br /> ft <br /> SITE HISTORY � <br /> r i <br /> te has been In rasion since 195°. In <br /> Acording to the station owner,etar.Rn�ks at this s z,the a moved and new underground fuel- <br /> it <br /> April 1990,all of the underground storag <br /> storage tanks were installed. Table i summarizes the avaltablE Information about from the storage <br /> �on plts <br /> history at the site. As required by the SMEHD,soil samples were collectedsults of these samples Indicated <br /> 3 and along the piping trenches for the fuel lines. Laboratory analyse <br /> sorbed hydrocarbons in excess of 50 parts ler million(ppm)In four sail samples(two from the fuel' <br /> tank pit,one from the waste�il-tanthe southern pit,and ore from <br /> mend of the <br /> eastern pump island). <br /> Based on these findings,Groundwater Technology,Inc.oonducted additional soil excava+.ion in these <br /> analyses of soil samples collected from the bases <br /> of the <br /> meq . Subsequent samfl Inij <br /> and laboratory c h drocarbans <br /> ned fuel-tank ane waste-oil tank-excavation pit_;�xxwed cpncentratlons ai adsorbed y <br /> deepe _ <br /> �._..W.,(;ROUNI) AMR <br /> TFCHN0L0 Gy-1NC. <br />