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nQuarter Quarterly Report - Second 2002 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 and preparation of this report.The location of the site and the immediately surrounding area are illustrated on Figure 1.; structures, former UST'locations and monitoring well. locations are illustrated -on Figure 2. Background information is summarized in the Preliminary Site Assessment Work Plan dated 30 November 1998 and Preliminary Investigation and-Evaluation Report dated 10 August 1999,both prepared by AGE. 2.0. PROCEDURES Monitoring wells MW-1 through MW-10 weremonitored and sampled on 18 June 2002 All field work was performed in accordance with guidelines issued by Central ValleyRegional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tank (UST) sites. 2.1. WELL MONITORING AND EVACUATION On 18 June 2000, a Solinst water level meter was used to measure the depth to ground water in the ten wells relative to the tops of the well casings.After the depth-to-ground water measurements were collected,casing water-in the monitoring wells were evacuated using new disposable plastic bailers. Approximately 6.5 to 7 gallons of water were evacuated from monitoring wells MW-1 through MW- 5 and MW-7 through MW-10;while 14 gallons ofwater were removed from well MW-6.All purged ' amounts were-equivalent to three casing-water volumes per well. Temperature, pH and conductivity were measured at regular intervals during purging using an ' Oakton water analyzer to monitor pH, temperature and conductivity of the purged water. Purged water was temporarily stored on-site in properly labeled DOT-approved 5 5-gallon drums. The field ' data logs are provided in Appendix A. ' 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES . Water samples were collected from each purged well with disposable bailers 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-m1 VOA vials containing 0.5 ml 18% hydrochloric acid as • a sample preservative. After collection, the samples were, properly labeled, placed in a chilled 1 Advanced CeoEnvironmental,Inc.