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ti <br /> ♦ t Y .. L <br /> r <br /> J , <br /> F <br /> Report - 1995 <br /> February <br /> Quarterly 1' <br /> _ <br /> I <br /> FLAG CITY <br /> CHEVRON <br /> 66421 Capital Avenue <br /> 1 <br /> ' Lodi, California <br /> 1.0. INTR1 11ODUCTION <br /> j <br /> accordance with a request from Mr Richard Bokides of,Flag 'Crty Chevron, Advanced ; <br /> In ared this Quarterly Report for 6421 Capital Avenue (s11 <br /> ite), <br /> GeoEnvironmental, Inc (AGE)hasparea <br /> Lodi, California The location of the site and the immediatelylC d on Fu re 2 are illustrated on <br /> Figure 1 Site structures and monitoring well locations are deg f <br /> t monitor dissolved petroleum hydrocarbon concentrations in ground` r Y <br /> The objective of the work was o ; r <br /> F water and to characterize ground water flow directionari <br /> San J agioiintCounty Public' H altli ' 'u <br /> _ prepared` in accordance with guidelines"established by <br /> ision (PHS-EHD) and by the Central Valley Regional Water <br /> Services - En�ironrnental Health Divt <br /> Quality Control Board(CVRWQCB) for investigation of underground ire S� nzmorage aa(UST) <br /> epn�t it1�A y <br /> Q Y ' <br /> ril <br /> summary of previous investigations at the site was included in`the Clow <br /> - 1996, dated 28 April 1997 prepared by AGE M; <br /> ! 1 1 1 <br /> 2 0. PROCEDURES <br /> A 2 1 , MONITORING WELL PURGE PROCEDURES s <br /> On 24 February 1998, the depth to ground water in each monitoring well vvas measured t6,the <br /> nearest 0 41 foot utilizing a Solist water level meter Ground♦water elevations from Mw-1, MW-2 <br /> ` - wells were there calculated by subtracting the measllTed depth to ground��Jater`from F <br /> ' and MW-4 (site ) <br /> the surveyed casing elevations (Table 1) Ground water elevations were plotted'and contoured on <br /> 5 <br /> a scaled site map (Figure 3) <br /> approximately ten gallons (a minimum of three well volumes per <br /> After waternlleve ls were measured, app Y <br /> well} of water were purged from each''of the three wells'utilizing atwo-stage submersible pump 'An <br /> H and conductivity of <br /> ICM Model 52200 water analyzer was utilized toy monitor temperature, p ` <br /> purged water at re-ular'purge volumes Dissolved oxygen content in purged ground water was <br /> odel 55 Dissolved Oxygen Meter following stabilization of the produced <br /> measured using a YSI M v Appendix A; dissolved oxygen field ; <br /> water Stabilization data and field logs are i included'wiih App <br /> measurements are summarized in Table 2`-Purged ground water'was containerized in,55-gallon <br /> 1eneral public access <br /> drums and stored on-site in an area.lacknrig'g p ' y <br /> 1 ' <br /> I L 1 <br /> 1 <br /> f 1 b 1 1 r 4 <br /> Aavanced GcoEn,.ironmentai,Inc 1 + <br /> Is } <br /> 1 S 1 l J <br /> f <br />