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i'�i)E"5I ftlf ti <br /> ZOES! MUM <br /> NaRK CORP. <br /> q� S5vTi <br /> JUf12 8 1991 <br /> June 26, 1991 f'�}t�11liftV!(:E`a <br /> Mr, Marlen Knoll <br /> datsquin Public Itr.altlti 5ervic", <br /> Environmental iiaolth lalvi zLan <br /> P.O. pox 2009 <br /> Stockton, CA 95201 <br /> RE, San Joaquin Catholic Com(Itery, StoGkcnn, CA <br /> Dear Mr. knoll <br /> In WaterWork's April 1 correap <br /> dear our to iconfirmce we cor recommended <br /> re-sampling of monitoring resence of bon-one in <br /> previous analytical data indicating the p <br /> groundwater at the referenced site. <br /> on April 18, .L991, well MW-1 was purged and sampled in accordawere <br /> nce <br /> with WaterWork's sampling pr cert. <br /> Duplicate water samples lied <br /> sent to Sequoia Analytical PHS cert. # 1210) and App <br /> Analytical (PHS cert. # 1211)• p (TnpO) and les were lythe zed faromatic <br /> petroleum hydrocarbons as gasoline <br /> pad x lends (pTE ), <br /> hydrocarbons benzene, <br /> toluene, ethylbenzone, Y <br /> using EPA 8015!8020 methodologies. At inclu as <br /> documentatian <br /> laboratory data sheets and chain-of-custody petroleum <br /> As in the previous sampling event, benzene was the only p <br /> s reported by <br /> hydrocarbon component detected. The(3. cone ) areiain substantial <br /> Sequoia (7.1 ppb) and Applied (3.h ppb) <br /> agreement and confirm that groundwater has beer► impacted by <br /> benzene. <br /> In the absence of other data, the lack of other gasoline ed by e�. e <br /> in groundwater at the site is possibly best explained <br /> and <br /> relative mobility of benzene due to high vapor p <br /> solubility. 9 rouadwates <br /> We expect to propose further investigation of a H <br /> contamfnatian-at_the._s .te.—which-will involve the installat on -a ------ ----------- — --- <br /> I'SC'ALON,CA 9Si.C1 • («g9M's3 }5(?7 <br /> Z�A %VA1 S11 AV \LT. • SANTA C;LARA,C'1 q5O51 • (40S)49&1249 <br />