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r •� <br /> r <br /> Quarterly Report - Second Quarter 2003 <br />' MANTECA CITY CORPORATION YARD <br /> 210 East Wetmore Street, Manteca, California <br /> r1.0. INTRODUCTION <br /> r 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 and well locations <br />' are illustrated on Figure 2 <br /> 2.0. PROCEDURES <br />' Ten ground water monitoring wells (MW 1 through MW 10) were monitored and sampled on <br /> 19 May 2003 Fieldwork was performed in accordance with guidelines issued by the Central Valley <br /> Regional Water Quality Control Board(CVRWQCB) for the investigation of underground storage <br />' tank(UST) sites <br />' . 2 1 WELL MONITORING AND PURGING <br /> On 19 May 2003, the depth to ground water in all ten monitoring wells was measured from the top <br /> r of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground water <br /> elevation in each well was calculated by subtracting the measured depth to ground water from the <br /> surveyed casing elevation (Table 1) <br /> rAfter water levels were measured, between 6 0 and 6 5 gallons of water (a minimum of 3 casing- <br /> water volumes per well)were purged from monitoring wells MW 1 through MW 10 using dedicated, <br />' disposable plastic bailers Ground water temperature,pH and conductivity were measured at regular <br /> intervals during purging using an Oakton water analyzer Field sheets and data are included in <br /> Appendix A Purged water was stored in properly labeled DOT-approved 55-gallon drums and stored <br />' on-site <br /> r2 2 COLLECTION OF GROUND WATER SAMPLES <br /> r Water samples were collected from each purged well using new disposable plastic bailers after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into one 1-liter amber bottle without sample preservative and into three <br />' 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative After <br /> collection, the samples were properly labeled, placed in a chilled container and transported under <br /> • chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health <br /> IServices-certified analytical laboratory, for analysis The samples were analyzed for <br /> Advanced GeoEnviron mental,Inc <br /> r <br />