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'• Quarterly Report - Thi rd Quarter 2003 ' M.ANTECA 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 East Wetmore Street, Manteca, California The site and the surrounding area are illustrated on Figure 1 Structures and ' well locations are illustrated on Figure 2 ' 2.0. PROCEDURES Ten ground water monitoring wells (MW I through MW 10) were monitored and sampled on 12 ' August 2003 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 1 ' 2 1 WELL MONITORING AND PURGING On 12 August 2003, 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 Solinst 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 4 0 and 4 5 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 stored in properly labeled DOT-approved 55-gallon drums and stored on-site I22 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 I-liter amber bottle without sample preservative and into three 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml IS% hydrochloric acid as a sample preservative Aber 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 of Health Services-certified analytical laboratory, for analysis The samples were analyzed for Advanced GeoEnvironmental,Inc