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33-30 Datta Or vp Delta -S °°p d ��. C 8Gq 9u 0 Envi 916163, 166ronrr+entai 38-208 J Consultants,Inc. FAX 9161638-8385 February 16, 1995 Ms Maria Guensler Exxon Company, U S A. Post Office Box 4032 Concord, California 94524-2032 Subject Quarterly Ground Water Monitoring Report, First Quarter 1995 Exxon Retail Station No 7-3708 2705 Country Club Boulevard " Stockton, California Delta Project No D093-809 Dear Ms Guensler Delta Environmental Consultants, Inc (Delta), has been authormed by Exxon Company, U S A (Exxon), to conduct quarterly ground water monitoring at foraw Exxon Retail Station 140. 7-3708, located at 2705 Country Club Boulevard, Stockton, California- This letter report presea s the results of quarterly ground water monitoring and spilling gond ed o anu 12, 1� The } location of the site is shown to Figure I and site features are illiistrd mFigure 2 The work. conducted at the site by Delta was performed=_w accordance with the d methods and procedures described in Enclosure A Ground Water ')Cable Elevation, Flow DirMfion,L drain ' Gradient Ground water table elevations were measured in each of the eight ground water monitoring wells at the site on January 12, 1995 Depths to ground water in the monitoring wells ranged from 11 55 to 14..29 feet below the tops of the well casings. Ground water table clevaitioas #lave increased approximately 12 feet since the previous tnomMring event in NOve"er 19%- emulative gnmoA water table measurements ne preserattd it1 TV* 1. }Auer tgW eentwt m Wsconstruciad f"rawtht' measurements recorded on January,}2, 19";' is utcludW as Ftp 3. 'ice waW Wft eofti�P •, indicate that ground water in the southwest arta ofthe tit generally toed Wward the holkelisk '7 a hydraulic gradient of approximately©.tom, *hseb istonsisteat wills the previous qua beer that !_ t Subjective Analysis No liquid-phase petroleum hydrocarbons or hydrocaim shem were present w4he wells dung the- . January 1995 site visit Analytical Results Ground water samples collected from'each of the eight oKmutormg welts on January 12, 1995, were submitted to Curtis and Tompkins, Ltd. (a Caltibrnia-certified laborawry) for analysis of benzene, toluene, ethylbenzene, total xylenes, alad til volatile hydrocarbons as 4r,*Wme Anaiyncal test results are summarized in Table 2 Gmuhd water samples collected ftotii mothoring wells MW-1, Prckiding a Competitive Edge