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Vii.°w:�aua ..##� P�' er•��r`;�$.��# n??'r}:. �' pY R. ���.��cus f Y �i � F�v'4('kq _ y ., p�e•`7F }���'-�:� .� 'r�_5s c F '�f�r.� .4,. � - <br /> e <br /> .a <br /> ..,....----... <br /> t .. ........ _ . <br /> t, Applied Gen,5ysteins 11 , I �„. � „ h„„i � � I,: , I > s.. ,f,I <br /> _.. _- -_ -- —.. <br /> j � � stir s li[''zii'r • SIt'RA`•lf�ffl • � lll�'CK (I11' • 4A� �Iltif <br /> � i Rf ntG1°.! o IK f\f I Il it l i`. I <br /> i <br /> May 23, 1991 <br /> G.)20rsis <br /> AGS 38012-7 <br /> I <br /> Mr. Rick Sisk <br /> Unocal Corporation <br /> P.O. Box 5155 <br /> t <br /> San Ramon, California 94583 <br /> ilarterl Ground-Water Monitoring, First Quarter 1991, at Former Unocal <br /> Subject: Q y <br /> Station No. 2859, 1665 Pacific Avenuc, Stockton. California. <br /> Mr. Sisk: <br /> This report summarizes the results of the first quarter 1991 ground-water monitoring that <br /> Applied GeoSystems. Inc. (Applied GeoSystems) conducted at the request of Unocal <br /> Applied <br /> Geion at the subject site. The site location is shown on the Site Vicinity Map (Plate <br /> CorpoP-1). The purpose of quarterly sampling is to monitor changes in concentrations of <br /> dissolved gasoline hyd.•ocarbons in the ground water and changes in the groundwater <br /> gradient. <br /> The work for this monitoring phase included subjectively analyzing ground water in two <br /> monitoring wells (wells ,1dW-4 and MW-5) and collecting and analyzing groundwater <br /> samples for dissolved hyda ocarbon constituents. We did not collect water samples from <br /> wells MW-1 through MW-3 or measure depths to water in these wells because the wells <br /> were dry. As a result. we could not evaluate the ground-water gradient beneath the site. <br /> The locations of the monitoring wells are shown on the Generalized Site Plan (Plate P-2). <br /> Previous Work <br /> Five soil borings were drilled at the site in January 1988 as part of a subsurface <br /> environmental investigation conducted by J.H. Kleinfelder & Associates (t leinfelder) of <br /> Sacra mento, California. Results of that investigation indicated that hydrocarbons were <br /> presont 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 tank 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 />