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Quarterly Report - April 1999 PACIFIC CAR WASH 4405 Pacific Avenue, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironnnental, Inc (AGE) has prepared this Quarterly Report for 4405 Pacific Avenue, Stockton, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 IThe objective of the work was to monitor dissolved petioleum hydrocarbon concentrations in ground water and to characterize ground water flow do ection and gradient on the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and by the Cential Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground stoiage tank (UST) sates A summary of previous investigations at the site was included in the Prehnnnw y Site Investigation and Evalualion Report -January 1997, dated 15 January 1997, and prepared by AGE 20 PROCEDURES On 15 April 1999, ground water monitoring and sampling weie peiforined on wells MW-1 through MW-10 Ground water inonitoiing and sampling pioceduies for the site were outlined in the 13"ork Plan Addendum -June 1998, dated 10 June 1998 pi epared by AGE and approved by the PHS-EHD by letter dated 24 June 1998 2 1 MONITORING WELL PURGE PROCEDURES Depths to ground water were measured in each well fiom the tops of the well casings at the site to` the nearest 0 01 foot utilizing a Solinst water level metes Ground water elevations in each well at the site were calculated by subtracting the ineasuied depth to ground water fiom surveyed casing Ielevations (Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) } After wntPi Ir-rtPlc tvera maaciµred i G rrillnro . F ryroiitnd ::l:ten : t;itt„”, •,, sem+ va r � „x�iu,ic vi three well-volumes per well) weie iemoved from wells MW-2 through MW-10 utilizing a two-stage submersible pump, approximately 1 gallon was purged from each well utilizing a hand bailer and new nylon cope Approximately 5 gallons of ground watei were removed from well MW-1 before being pumped "dry ' Temperatuie, pH and conductivity were nncasured for stabilization at regular purge-volume inteivals froinn each well using an ICM Model 52200 water analyzes Field data and logs are included with Appendix A Purged ground water was containerized in 55-gallon diunns and was stosed on-site in an area lacking general public, access Arhanced CcoLnrironnicntll,Inc