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ME <br /> } ' tG <br /> ti <br /> t <br /> i <br /> F's <br /> I <br /> If3H�rMg9oC3rAyvdf g9TREET <br /> ., tiV00I)GAND, CA S,56().` '03 <br /> J7 E,5 TZ RN FAX (910' 662-0273 <br /> 1 Gj:t7-F_JYGINEF_R,) (916) 608-5300 <br /> CALIF C0NTRAC OR 11513957 A CORPORATION <br /> G= REGISTERED GEOLOGISTS <br /> 1.0 INTRODUCTION <br /> EXXON, Inc. subleas,�d Regal Service Station 603 from Wickland Oil <br /> Company (WOC} . Woc upgraded the station wit?r a double contained <br /> f the <br /> product storage and dispensing system. During t'�ze removagasoline <br /> old underground storage tanks and subsequent assessment, <br /> range hydrocarbon contamination <br /> was <br /> wfound <br /> bto ext sthinsiboth the <br /> n <br /> native soil (vadose zone) ground <br /> 1.1 LOCATION <br /> The station is located at 6425 Pacific Avenue at the intersection <br /> a. The <br /> of Douglas Road, in San Joaqui.nRGountDB&Mtatkappr approximately feet <br /> site lies in Section 21; T2N; 2 3 and 3A) . The <br /> above mean sea level (MSL) (see Figures 1, , <br /> parcel is # 31 and can be located in Assessor's Book 97 on page <br /> 41 (97-041-31) . <br /> 1.2 PREVIOUS REPORT (UPDATE STATUS REPORT #4, DECEMBER 1990) <br /> The following are the conclusions and recommendations of the <br /> December, 1990, Quarterly Update Status report: <br /> CONCLUSIONS <br /> 1. Floating product, clear yellow gasoline, has again been <br /> discovered in r:onitor well MW1 at a thickness of 0-08t - <br /> 2. High levels of dissolved constituents of gasoline occur <br /> beneath the site in the ground water and trend off site: <br /> towards monitor well MW8, to the east. <br /> 3. During sampling of MW3, MW7, M1v8 and MW10 distinctive= <br /> bio odors and a greyish green color of the purged Nater <br /> that active in-situ <br /> were noted, suggesting the erimPters of the <br /> biodegradation is occurring along p <br /> plume. <br /> t the <br /> 4. earymonitoring fewell coindicates <br /> Analsis for MWB8 letksandishasewer <br /> entering the <br /> around water. <br /> 5. Ground water levels shave that the aquifer is still <br /> discharging (lowering) with an irregular surface forming <br /> a trough that flows from monitor well MW1 east towards <br /> This <br /> MW2 and then southeast towards MW3 and onto are <br /> W5 <br /> - as that <br /> trough corresponds to the higher ve <br /> PAGE 1 <br />