ARCHIVED REPORTS_XR0007188 - Laserfiche WebLink

Home Browse Search

' Quarterly Report - Second Quarter 2005 . LOPEZ PROPERTY ' 1601 Turnpike Road, Stockton, California ' 1.0. INTRODUCTION At the request of Ms Mable Keir, Advanced GeoEnvironmental, Inc (AGE) has prepared this ' quarterly report for the property located at 1601 Turnpike Road, Stockton, California (site) The scope of work included conducting a quarterly ground water monitoring event and preparation of this ' report, the objective of the work was to assess, characterize and monitor dissolved petroleum hydrocarbon concentrations in ground water and to calculate ground water flow direction and gradient on-site The site setting is illustrated on Figure 1 Site structures and monitoring well ' locations are depicted on Figure 2 This report has been prepared in accordance with guidelines issued by the Central Valley Regional ' Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites A historical site background is summarized in Appendix A 1 2.0. PROCEDURES ' • Three monitoring wells (MW-1 through MW-3) were monitored, purged and sampled on 05 May 2005 Field work was performed in accordance with San Joaquin County Environmental Health Department (EHD) guidelines for sampling ground water monitoring wells and CVRWQCB Iguidelines for the investigation of UST sites ' 2 1 QUARTERLY WELL MONITORING PROCEDURES On 05 May 2005, the depth to ground water in the three monitoring wells were measured from the ' top of each well casing to the nearest 0 01-foot utilizing a Solmst water level meter, ground water elevations for each well were calculated by subtracting the measured depth to ground water from the ' surveyed casing elevation (Table 1) After water levels were measured, approximately 5 5 to 7 5 gallons of water (a minimum of 3 casing-water volumes per well) were purged from monitoring wells MW-1 through MW-3 using dedicated disposable plastic bailers Ground water temperature, pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix B Purged water was stored in properly labeled Department of Transportation (DOT)-approved 55-gallon drums and stored on-site I 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each monitoring well using dedicated,disposable plastic bailers • after allowing the well to achieve a minimum 80% recovery of the pre-purge water volume The IAdvanced GeoEnvironmental,Inc