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u <br />' Quarterly Report - Third Quarter 2005 <br /> . LOPEZ PROPERTY <br /> 1601 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 site setting is illustrated on Figure 1 Site structures and monitoring well locations are <br />' 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 A historical site background is summarized in Appendix A <br /> 2.0. PROCEDURES <br />' Three monitoring wells (MW-1 through MW-3) were monitored and sampled on 04 August 2005 <br /> Field work was performed in accordance with San Joaquin County Environmental Health <br />' • 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 04 August 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 Sohnst water level meter,ground water <br /> elevations for each well were calculated by subtracting the measured depth to ground water from the <br /> Isurveyed casing elevation (Table 1) After water levels were measured, approximately 5 5 to 7 5 <br /> gallons of water (a minimum of 3 casing-water volumes per well) were purged from monitoring <br /> wells MW-1 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 /> Ilabeled Department of Transportation (DOT)-approved 55-gallon drums on-site <br /> I2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using the dedicated, disposable plastic <br /> bailers after allowing the well to achieve a minimum 80%recovery of the pre-purge water volume <br /> The samples from each well were transferred into three 40-milliliter (ml) volatile organic analysis <br /> (VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative The samples <br /> IAdvanced GeoEnvironmental,Inc <br />