ARCHIVED REPORTS_XR0005078 - Laserfiche WebLink

Home Browse Search

1 Quarterly Report - Second Quarter 2006 BOB'S MUFFLER SHOP ' 466 Moffat Boulevard,Manteca, California ' 1.0. INTRODUCTION At the request of Mr. Tom Barbour of Bob's Muffler Shop, Advanced GeoEnvironmental, Inc. (AGE)has prepared this quarterly report for the property located at 466 Moffat Boulevard,Manteca, California.The scope of work included a quarterly ground water monitoring event,fate and transport modeling of the residual hydrocarbon contamination at the site and preparation of this report. The location of the site and the immediately surrounding area are illustrated on Figure 1. Structures, former underground storage tank(UST) locations, and monitoring well locations are illustrated on Figure 2.Well construction details are included in Table 1. Additional site background information ' including historical soil and soil vapor sampling analytical data is provided in Appendix A. r2.0. PROCEDURES On 09 June 2006, monitoring wells MW-1 through MW-10 were monitored and sampled. All field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of UST sites. 2.1. WELL MONITORING AND PURGING ' A Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-10 relative to the tops of the well casings. After the depth to ground water ' measurements were collected, casing water in the wells was evacuated using dedicated, disposable plastic bailers. Approximately 8 to 9 gallons of water were evacuated from shallow wells MW-1 through MW-5 and MW-7 through MW-10; approximately 15.75 gallons of water were removed ' from deep well MW-6. All purged amounts were equivalent to a minimum of three casing-water volumes per well. ' Temperature, pH, and conductivity of the purged water were measured at regular intervals during purging using an Oakton water analyzer. Purged water was temporarily stored on-site in properly' labeled, Department of Transportation (DOT)-approved 55-gallon drums. The field data logs are ' . provided in Appendix B. 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES A water sample was collected from each purged well with a dedicated,disposable plastic bailer after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume.Each water sample was transferred into laboratory-supplied 40-milliliter(ml) volatile organic analysis (VOA) Advanced GcoEnvironmental,Inc.