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Y �s <br /> October S. 1991 <br /> o. 492, Manteca, California <br /> Beacon Station N <br /> well <br /> Table 2). The geologist then collected groundwater samples from each monitoring <br /> for laboratory analyses. roved for this use by the <br /> Water purged from the wells was placed in 55-s•'llon drums app <br /> De nd stored temporarily at the site pending removal by <br /> partment of Transportation a <br /> Ultramar Inc. <br /> The groundwater samples were analyzed for latal petroleum by <br /> drocar',ons as gasoline <br /> ethods <br /> and 8015 itid <br /> (TPHg) using Environmental Prntection nc, ethylbenzene, and total x}'�'g lene isomers omers(B�1'EX ) Osp g EPA Methods <br /> benzene. toluenelied Analytical Environmental <br /> 5030 and 602. The samples were analyzed at App <br /> L-iboratories in Rancho Cordova.previous analia yses re sumous umatrizedsisnTable 3. n <br /> E 773). The results of these and p <br /> Concentrations of TPI�g andlBin liX in mits for the analytles �al methodected srusedls iviW 1. MW 2. <br /> MW-3 were below detection <br /> W^ork in Progress ork <br /> an <br /> At the request oher <br /> f Ultramar i lli�tiudesly preparing a w <br /> the irsstallation of anladd`ttionalor tonsite <br /> assessment at the site. Th PThe <br /> monitoring well downgradient of the existing moniiarirlgolved h dro aabonsnare ssttllwill <br /> mons g <br /> be installed to evaluate whether previously detected 1s <br /> present in the ground water underlying the site and to more accurately measure the <br /> direction of groundwater flow and gradient. <br /> The <br /> next sampling event has been scheduled for the third ise Laurie September <br /> he Sane <br /> recommend signed copies of this report be forwarded <br /> Box 2009, <br /> Joaquin County Local Health D�tlsictE,lEnvironmental <br /> abeth Thayer ofethe Californiaalth R Division. <br /> Water <br /> Stockton, California 95201, and r <br /> Quality Control Board, Central Valley Region. 3443 Routier Road, Sacramento, <br /> California 95827-30 i& <br /> 0628gdem 2 <br /> 96101-6 <br />