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a %�.. �-- x� :3�^�...,���1 �'-� ��,' ��rri-' �..-xr{-r��. �'�.a �sii�..�-W.t'��'�`r� 4' `'-�' �-c�-��;�. crF`3'"�..A _r�.v�;'n�, .1�,.� :.�.:Y'�r _ �er.�ea�. �`f'�2�.4_.r.•'�,, <br /> d e ?�,h r'. r- gx..rY' ,--r.'", '� _,. '"- ��.,a �i rl-. -��0:3.'u�1.y. ' se, .X?ci.r..z.s-ra•�e -a,nn_-_�-...uu�� .'rv' �iiSzYf[a� <br /> ,e <br /> o- <br /> .1 Rr.SNA Cornpany F.rrvrranmrnfdl SuJntiuns' <br /> Through A1J)r1icd SCiMCCr <br /> 10ginverinfp 3 C.? 0W)Clinn <br /> 1191-E Pottier Inn Rmvl <br /> Sac'ratnen'.,,CA 951526 <br /> PHONE 19161 452.2901 <br /> FAX(916)4 52-05 31 <br /> July 3, 1991 <br /> „.p <br /> Mr. hick Sisk <br /> Unocal Corporation <br /> P.O. Box 5155 <br /> San Ramon, California 94583 <br /> 0 Subject: Quarterly Ground-Water Monitoring,Second Quarter 1991,at Former Unocal <br /> Service Station No. 2859. 1665 Pacific Avenue, Stockton. California. <br /> Mr. Sisk: <br /> 0 This report summarizes the results of the second quarter 1991 around-water monitoring that <br /> Applied GeoSysterns, Inc./RESNA industries (Applied GeoSystems) conducted at the <br /> request of Unocal Corporation at the subject site. The site location is shown on the Site <br /> Vicinity Map (Plate 1). The purpose of quarterly sampling is to monitor changes in <br /> concentrations of dissolved gasoline hydrocarbons in the ground water and changes in the <br /> ground-water gradient. <br /> The work for this monitoring phase included subjectively analyzing ground water in two <br /> monitoring wells (wells N1W-4 and MW-5) and collecting and analyzing ground-water <br /> samples for dissolved hydrocarbon constituents. We did not collect water samples from <br /> 0 wells MW-1 through MW-3 or measure depths to water because these wells were dry. As <br /> a result, we could not evaluate the groundwater gradient beneath the site. The locations <br /> of the monitoring wells are shown on the Generalized Site Plan (Plate 2). <br /> Previous Work <br /> ite in January 1988 as part of a subsurface <br /> Five soil borings were drilled at the s <br /> environmental investigation conducted by J.H. Kleinfelder & Associates (Kleinfelder) of <br /> Sacramento, California. Results of that investigation indicated that hydrocarbons were <br /> present in soil underlying the site (Kleinfelder, March 3, 1988, Report No. 24-2081-01). <br /> Applied GeoSystems began an environmental investigation in conjunction with underground- <br /> storage lank removal in March and April 1988. During this investigation, a geologist <br /> observed removal of the underground storage tanks and collected soil samples for laboratory <br /> analysis of hydrocarbons. Results of analyses indicated that hydrocarbons were present in <br /> 0611rsis <br /> 38012-7 <br />