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Ground Water Monitoring Report - Third Quarter 2001 MANTECA CITY CORPORATION YARD ' 210 East Wetmore Street, Manteca, California ' 1.0. INTRODUCTION At the request of Mr Frederic Clark of the City of Manteca, Advanced GeoEnvironmental, Inc (AGE)has prepared this quarterly report for the property located at 210 E Wetmore Street,Manteca, California The site and the surrounding area are illustrated on Figure 1 Structures,boring and well locations are illustrated on Figure 2 Background information is summarized in the Monitoring Well Installation Work Plan, dated 25 January 2001, prepared by AGE ' 2.0. PROCEDURES I Field work was conducted and this report was prepared in accordance with guidelines established by the Central Valley Region of the Regional Water Quality Control Board (CVRWQCB) for subsurface investigation of underground storage tank(UST)sites and guidelines established by San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD) for sampling ground water monitoring wells 2 1 MONITORING WELL PURGE PROCEDURES IGround water sampling of MW1 through MW4 was conducted on 11 July 2001 For the sampling event, a Solinst water level meter was used to measure the depth to ground water in the four wells relative to the tops of the well casings The ground water elevations and gradient were determined from these data(Table 1) After recording water level measurements,a disposable plastic bailer was used to purge monitoring wells MW1 through MW4 of standing water Approximately 6 gallons of water (a minimum of 3 casing water-volumes per well)were removed from MW 1 through MW4 Groundwater temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Purged ground water was containerized in properly labeled DOT-approved model 17H 55-gallon drums and was stored on-site Field sheets and data are included in Appendix A I 2 7 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers Each water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid I as a sample preservative and into one 1-liter amber bottle without sample preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to MAI The samples were analyzed for Advanced GeoE.nvironmental,Inc I