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�¢ -- � Y--.fes• i":� �"r� P _ _ ",�''-``�' -�r1_��- :-� - -� �� .w_e `a- <br /> � <br /> n, <br /> p - � <br /> ,N <br /> grown .2no CnISHINCH <br /> JUL 2 2 "1 <br /> �r�f_�•itf'.L_1.,rAL1�-t <br /> July j8' 1991 <br /> mr. Chuck Carmel <br /> ;ARCO Products Company t)17-400-40/1 <br /> post Office Box 5811 <br /> San Mateo.California 94402 <br /> Subject: April 1991 Quarterly Report for kIiC 01d16tion 2093. 3525 Tracy Boulevard. <br /> Tracy, California: Pilot Program <br /> Dear Mr. Carmel: _ <br /> l in�t <br /> This report presents I.uaneriv water level; al dSta ion 2093,to results <br /> at 3 425 Tracy Boulevard <br /> Performed at ARCO Products Company tAR ) t through ATR-7) <br /> in Tracy, California on April 10, 1991. There are -12)(Figure 1).e�(on-s te`and off-site'velis <br /> and three off-site wells(ATR-9.ATR_10.and ATR ) <br /> were measured and sampled except ATR-7 which was unaccessible. There are no monttorirtg <br /> ers ATR-8 or A1 R-11. <br /> wells corresponding to the identifi <br /> Field and Analvtical Methods in of each well, <br /> Brown and Caldwell personnel measured depth.t efer toRsupervised:JubitA for detailedfieldmethods <br /> and collected groundwater sample <br /> s at the description. ?. summary of the groundwater measurements is presented in Table 1. <br /> All groundwater samples were m,iivzed for total petroleum hydrocarbons l'IT1I) and benzene. <br /> ctlhvlbenzene.toluene,and xylenes lBh"I'X)by Modified U.S.Environmental Protection Agency <br /> Method 801515030/8020. <br /> Results <br /> resents the hydraulic gradient data from <br /> gradient of approximately 0.01 (Figure 1). Table 2 <br /> The general groundwater flow direction beneath the station is to the northeast under a lhydratrltc <br /> P <br /> previous moratanng periods. with previous <br /> tis f groundwater samples are summarized in Table 3. along P bit <br /> Analytical rc_ ^ lin(* event. <br /> results. '1�:e ,:otr�plrte laboratory report for the April 10. 1991 samplutg is presented ui E''� <br /> B. Figure 2 �gesenEs the TPH and BEI�X concentrations for the April 1991 ramp <br /> — - I=inure 3-presents_a benzene contour map. <br />