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' T •L Quarterly Report -Third Quarter 2004 MANTECA CITY CORPORATION YARD ' 210 East Wetmore Street, Manteca, California I1.0. 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 East Wetmore Street, Manteca, California The enclosed report documents the procedures and results of quarterly monitoring of ten ground water monitoring wells The site and the surrounding area are illustrated on Figure 1 Structures and well locations are illustrated on Figure 2 2.0. PROCEDURES ' On 17 August 2004, ten ground water monitoring wells (MW-I through MW-10) were monitored and sampled Field work was performed in accordance with guidelines Issued by the Central Valley Regional Water Quality Control Board(CVRWQCB) for the investigation of underground storage tank (UST) sites 2 1 WELL MONITORING AND PURGING On 17 August 2004, the depth to ground water in all ten monitoring wells was measured from the top of each well casing to the nearest 0 01-foot utilizing a Sollnst water level meter Ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) After water levels were measured,between two and three gallons of water(a minimum of 3 casing- water volumes per well)were purged from monitoring wells MW-1 through MW-10 using dedicated, disposable plastic bailers Groundwater temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix A Purged water was containerized in properly labeled Department of Transportation (DOT)-approved 55-gallon drums and stored on-site i2 2 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into one 1-liter amber bottle without sample preservative and into three 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After collection, the samples were properly labeled, placed in a chilled container and • transported under chain of custody to McCampbell Analytical,Inc (MAI), a California Department IAdvanced GeoEnviron mental,Inc