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r <br /> r- <br /> a } <br /> $yq <br /> S NO <br /> 011 <br /> EEMS <br /> '4 <br /> �.f2 OF <br /> UAIi"1'f:lil.Y M0NFI�(]ii1NC, fti�Pnit'f SF.C(JNi) 4fAf2"i'I19'�I <br /> Tracy racy vard 5hcli <br /> 375 Tracy fioultv:trd,Tracy, _:atifornia <br /> Shell VRNO-204-7ti&-t.4"" <br /> Nita Projc"'L40'4-"4)l2 <br /> Page 2 <br /> in following <br /> Back round information and work conducted to date. at the project site are discussed the <br /> g <br /> reports: <br /> 0 proposed 1Vork plan for prerank Closu-e Sire:lssessnierit,Delta, lune 19. 1989. <br /> e pretank Closure Sire Assessment,Delta,November 22,1989. <br /> e preliminary Report and Tank Closure Report,Delta,November 28. 1990. <br /> a Quarterly -VIO"itoring Report, Fourth Quarter of 1990,Delta, ebrua1891.1991. <br /> Quarterly,Lfor:iroring Report, Firs[Quarter of 1991, Delta,April <br /> 2.2 Monitorin I'Velfs <br /> wells MW-1,�,iW-2,and MW-3 were drilled and installed around the perimeter ofthe A!and <br /> Monitoring replacedwells MW-IA,M <br /> a depth of 22 feet. These wells were abandoned an a ici�adjacenttoto the abandoned well locations <br /> MW-3A on August 16, 1990• The new wells <br /> (Figure 2). <br /> 3.0 RESC31.T8 Or INVFSTIGAT'fON ACTpfrr i- <br /> 3.1 Ground Wate991 <br /> r Elevntian Data <br /> t <br /> Depths to ground water were measured at monitoring wells MW-1�MW-2A,and MW-3A an May 17,1 <br /> p ground water elevation data collected during <br /> Ground water elevations are summarized to Table I. Using <br /> the May 17,1991,sampling event,a ground water cat .it -tap was prepared g and is presented lately 4-002. <br /> Y <br /> The ground water flow direction was towards the northeast at a hydraulic -adient o approximately <br /> 3.2 Ground Nater Anafvtical Results _ from monitoring wells M1'/-lA MW 2'°` <br /> Ground water samples t <br /> and <br /> were collected on May t, 1�1' for analysis of benzene, toluene, <br /> �tW-3A and were submitted to a California-certified laboratory fO Chemical analysis results were <br /> ethylbenzene,and xylenes(BTEX),and total petroleum hydrocarbons{gasoline.all below laboratory method detection limits for BTEX and TPH as 5 <br /> --- <br /> Ground water anaiytical results for samples collected through May 17, 1991, are summarized in Table 2. <br /> Certified laboratory reports are presented in . peen t <br />