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i <br /> Quarterly Report - First Quarter 2005 <br /> • LOPEZ PROPERTY <br /> I1601 Turnpike Road, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Ms Mable Keir, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br />' quarterly report for the property located at 1601 Turnpike Road, Stockton, California (site) The <br /> scope of work included conducting a quarterly ground water monitoring event and preparation of this <br /> report, the objective of the work was to assess, characterize and monitor dissolved petroleum <br />' hydrocarbon concentrations in ground water and to calculate ground water flow direction and <br /> gradient on-site The site setting is illustrated on Figure 1 Site structures and monitoring well <br />' locations are depicted on Figure 2 <br /> This report has been prepared in accordance with guidelines issued by the Central Valley Regional <br />' Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) <br /> sites <br /> 2.0. PROCEDURES <br />' • Three monitoring wells (MW-1 through MW-3) were monitored, purged and sampled on <br /> 24 February 2005 Fieldwork was performed in accordance with San Joaquin County Environmental <br /> Health Department(EHD)guidelines for sampling ground water monitoring wells and CVRWQCB <br />' guidelines for the investigation of UST sites <br />' 21 QUARTERLY WELL MONITORING PROCEDURES <br /> On 24 February 2005,the depth to ground water in the three monitoring wells were measured from <br />' the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter,ground water <br /> elevations for each well were calculated by subtracting the measured depth to ground water from the <br /> surveyed casing elevation (Table 1) After water levels were measured, approximately 4 5 to 6 5 <br />' gallons of water (a minimum of 3 casing-water volumes per well) were purged from monitoring <br /> wells MW-I through MW-3 using dedicated disposable plastic bailers Ground water temperature, <br />' pH and conductivity were measured at regular intervals during purging using an Oakton water <br /> analyzer Field sheets and data are included in Appendix B Purged water was stored in properly <br /> labeled Department of Transportation (DOT)-approved 55-gallon drums and stored on-site <br /> 1 <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using dedicated,disposable plastic bailers <br /> after allowing the well to achieve a minimum 80% recovery of the pre-purge water volume The <br /> tAdvanced GeoEnv►ronmental,Inc <br />