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QUARTERLY GROUNDWATER MONFMFUNG REPORT <br /> 6137 pacific Avenue Stockton California <br /> 1 0 INTRODUCTION <br /> This report documents the results of quarterly groundwater monitoring conducted by <br /> Emcon Associates (Emcon) of Sacramento, California, on '1Aay-12,=199 at the Shell Oil <br /> ECompany (Shell) service station located at 6131 Pacific Avenue Nin Stockton, California <br /> (Figure 1) The monitoring included collection of measurements of depths to liquids in <br /> I the three groundwater monitoring wells (MW-1, MW-2, and MW-3) and groundwater <br /> samples from two of the wells (MW-1 and MW-2) located on site (Figure 2) This report <br /> is based, in part, on information obtained by Aegis from Shell and Emcon, and is subject <br /> to modification as newly acquired information may warrant <br /> t 2.0 SITE DESCRIPTION <br /> f The Pacific Avenue Shell site is an active service station that retails unleaded gasolines <br /> Details of the site's facilities were reported to Shell by Aegis in a "Site Assessment <br /> Report," dated January 4, 1991 The site is located in a commercial/residential area of <br /> f Stockton <br /> l <br /> 3.0 BACKGROUND <br /> M d trtng--March-498a;-Aegis drtged and sampled fourteen-soft bonnga-on site (report to,, <br /> `Shy dated ,tuner.181 ). In Juno t990,1:hree underground fuet storage tanks (UST),, <br /> I ,9f suagle-wall steetconstruction, and associated piping were excavated and removed from -7 <br /> I the-�P+te Three new U$T, ,of double-wall fiberglass construction, were mst it d in a new <br /> tank basirr ffFgure_2)._A, horiZontat run-of stotted xpe.vms installed beneath the formme6 <br /> rp ions pess+f future use-for_so.il u ractigap <br /> )y-1990, Aegis coiadgEtedwdrirg-aad sampling of five additional soil borings on site <br /> Groundwater monitoring wefts MW-1,-MW-2,-arid--MW-3-were tnstalted to three-of the ) <br /> borings_(report to-Shell dated -January 4, J1991)-- Vadose zbne vapc��xtraction wells; <br /> VE-W-41-a -- <br /> ndVEW=2,were_instailed in_the_remaining twDlyonnglb <br /> Depth-to-liquid dmeasurements were collected monthly from the monitoring wells following <br /> installation through October 8, 1991, and are currently being collected on a quarterly <br /> i basis Liquid level data collected during the past 12 months are summarized in Table 1 <br /> Groundwater samples have been collected on a quarterly basis since the wells were <br /> installed Analytical results of groundwater samples collected to date are summarized in <br /> Table 2 <br /> 90-0208 QMFt 7 <br />