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1 " . <br /> 1 Quarterly Report - Third Quarter 2002 <br /> • MANTECA CITY CORPORATION YARD <br /> 1 210 East Wetmore Street, Manteca, California <br /> 1 1.0. INTRODUCTION <br /> 1 At the request of Mr Frederic Clark of the City of Manteca, Advanced GeoEnvironmental, Inc <br /> (AGE)has prepared this quarterly report for the property located at 210 E Wetmore Street,Manteca, <br /> California The site and the surrounding area are illustrated on Figure 1 Structures,boring and well <br /> 1 locations are illustrated on Figure 2 Background information is summarized in the AGE-prepared <br /> Additional Site Assessment Work Plan -August 2001, dated 25 January 2001 <br /> I <br /> 2 0. PROCEDURES <br /> 1 Seven ground water monitoring wells (MW1 through MW7) were monitored and sampled in <br /> July 2002 Field work was performed in accordance with guidelines issued by the Central Valley <br /> 1 Regional Water Quality Control Board (CVRWQCB) <br /> lie 2 1 WELL MONITORING AND EVACUATION <br /> Ground water sampling of wells MW 1 through MW7 was conducted on 18 July 2002 For the <br /> 1 sampling event, a Solinst water level meter was used to measure the depth to ground water in the <br /> seven wells relative to the tops of the well casings The ground water elevations and gradient were <br /> determined from these data (Table 1) <br /> 1 After recordingwater level measurements,disposable plastic bailers were used to purge monitoring <br /> p <br /> wells MW 1 through MW7 of standing water Approximately five gallons of water(a minimum of <br /> 1 3 casing water-volumes per well) were removed from wells MWI through MW7 Ground water <br /> temperature,pH and conductivity were measured at regular intervals during purging in MW 1 through <br /> 1 MW7 using an Oakton water analyzer Purged ground water was containerized in properly labeled <br /> DOT-approved model 17H 55-gallon drums and was stored on-site Field sheets and data are <br /> included in Appendix A <br /> 1 <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> 1 Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid <br /> as a sample preservative and into one 1-liter amber bottle without sample preservative After <br /> collection, the samples were properly labeled, placed in a chilled container and transported under <br /> IAdvanced GcoEnviron mental,Inc <br />