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Cy <br /> c,l,t kt� S Ea western Ar;via1 Operawns <br /> EA Engineering,Scienc Tec'hnalegy 4: latayeve Circe <br /> l,-`3gen8.CA 94549 <br /> • � rG �� <br /> Telephone;415-263-707 7 <br /> 40 0 <br /> + tirl I�d � ' c) Fax.415.283-3894 <br /> 6A <br /> h ? <br /> . .w"4 hlr --r-+-r r11pr <br /> Jf 89 N.C. I. - sqw j. .4,,? ���, ,+ h� <br /> 8 August 1989 <br /> Lisa Marinaro <br /> Chevron U S.A. Inc. ---- -=y"� ' <br /> 2414 Camino Ramon <br /> San Ramon, Californi 3 <br /> RE: Quarterly ampling and Analysis of Gro <br /> me n <br /> Former C evron SS 9-7780 !L ,-1�;1f I#� r� :� i r� �`iFr,iL ; <br /> 3246 E . emont Street, Stockton, Cal 1P2R ScRV!;;ES <br /> Dear Lisa: -��— <br /> As requested by Chevron U.S.A. Inc. , E'� has sampled the ground- <br /> water at former Chevron Service Station ( SS) 9-7780 EA3Stockton, <br /> California. The groundwater from three wells ( EA1 , <br /> was sampled on 21 June 1989. Four other wells -ton the'site_•could <br /> � not be sampled because the water table -he'd dTopp1ed,:<.p&st thg� <br /> bottom of the wells. Samples of groundwater collected from the <br /> three wells were subm9.tted under chain of custody to Pace <br /> Laboratories, where the samples E were analyzePA Method d for total <br /> talapomaticum <br /> hydrocarbons (TPH ) by modified <br /> petroleum hydrocarbons, benzene, toluene, ethylbenzene, and <br /> xylenes, by EPA Method 8020. The analytical results are pre- <br /> sented in Table 1 and are compared with the analytical results of <br /> previous sampling in Ta51e 2 . Depths to groundwater, as indi- <br /> cated in Table 3, have increased over 10 feet since February <br /> 1988, probably as a result of two years 7f drought and increased <br /> USF-2 of groundwater. The flow direction determined from the <br /> calculated elevations of groundwater in three wells is west- <br /> northwest and apparently has not changed much since March 1989, <br /> although the gradient is nearly fiat ( 0. 0006 ) . <br /> Concentrations of petroleum hydrocarbons greater than the method <br /> detection limits of 50 ug/L for TPH and 0 . 5 ug/L for BTEX were s <br /> not detected inany of the samples of groundwater from the three <br /> wells EA1 , EA3, and EAI. <br /> The possibility that groundwater would rise during the spring was <br /> discussed earlier with John Randall, but the groundwater didines <br /> not <br /> rise as expected. Therefore, in order to comply 9 <br /> ,,)f San Joaquin County and the Central Valley Region of the <br />