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_ ,� �' .v_ � � _yG F . _ .: _ s Y �. a�+F ..�s-r� r syx�•,i. _ �+ .. <br /> M <br /> additional_ well csana3cysig oftggroundTwaterconcentrations <br /> of <br /> up to 24 ppm, while <br /> these wells resul. 1987ted in etoroctobero1988�;ground hwaters <br /> 41 Ppm. From Septembere:foznned by KEI. <br /> monitoring and sampling at the site was p and <br /> Free floating product was observed in Ml.eno• (BTEX)Gconsti.tuent <br /> benzene, toluene, ethylbenzene, And xy les from five of the <br /> concentratiions �wer8)detected in the same <br /> wells (mw-4 <br /> and August 1990, Alton Geoscience, Inc. <br /> Between Ag wells (AMW-1r AMW-2, <br /> Amwinstalled. four addoffsite.itional moAnalytical result" of soil <br /> _3� and AMW-4) s indicated no TPH-�G above the <br /> sampled from the well boring <br /> reported detection ituento were excepdetected only int in the soil nthe samples <br /> 7,MW-2• BTE pent sig of water samples revealed TPH�-G <br /> from boring AMW-1. Y -3 at <br /> in the nQHTEXfrom <br /> consuentsdweje detected intthe iground <br /> 0.10 ppm. at <br /> s below <br /> water primaximumcontami-3 and naant4levelsr�(MCL)aforndrinking <br /> cen <br /> state primary <br /> water. <br /> aJuly 12 and 20, 1990, Alton GeoBCience, Inc. monitored and <br /> On sampled each well. Free product was again observed in MW-3in <br /> Was <br /> pith thickness of 0.05 fee4t. TPH_ a6dTBTX <br /> E8 and AMW-1t(P-1) . <br /> the sample from MW-2, MW ► reported detection <br /> limits in Bsamples were <br /> eofromtMW�la above t <br /> Mw-7, AMW-2, AMW--3► and <br /> AMW-4. <br /> t FIELD PROCEDURES <br /> on February 25, 1991, Alton Geoscieito ng Wells)monitored atformer <br /> sampled the twelve ground water monitoring <br /> at <br /> Mobil Service StatCalifornia.ion 10-NP4, lThe ted ground2water 75 rmonitoring <br /> Boulevard, TracY, <br /> and sampling procedures were in accordance with t e <br /> requirements of the Calegiioni(RWQCB)nand theSan <br /> Water <br /> aJoaquinntrol <br /> Board, Central Valley Reg <br /> county Public Health Services (SJCPHS) - <br /> Prior to purging and sampling each well, total well depth and <br /> ark a <br /> depth to ground hater was metauthe nearestreferencered from a m0.01 foatusingtan <br /> the top of each well casing les were also collected <br /> electronic sounder. Ground water same <br /> at this time using a hand bailer and checked for the presence <br /> of free product or sheen. <br /> ------------------.------_ _._.-__..-- --------._.._ . led.__after purging three well casing volumes <br /> ---Each Each_weil...was-._same g temperature --and--conductiv ty--- <br /> or until stabilization of pH,collction . Ground water <br /> was achieved prior to same r and then <br /> samples wex o tlecapprted opriate clean sample containere for <br /> transferred to the appropriate <br /> 2 <br />