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' Quarterly Report - First Quarter 2002 BOB'S MUFFLER SHOP ' 466 Moffat Boulevard, Manteca, California 1.0. INTRODUCTION At the request of Mr. Tom Barbour of Bob's Muffler Shap, Advanced GeoEnvironmental, Inc. ' (AGE)has prepared this quarterly report for the property located at 466 Moffat Boulevard,Manteca, California. The scope of work included,installation.of one ground water monitoring well, a well-casing elevation survey,quarterly ground water monitoring and preparation of this report. The location of the site and the immediately surrounding area are illustrated on Figure 1; structures, foriner' 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. 1. 2.0. PROCEDURES ' One ground water monitoring well(MW-7)was installed,developed and sampled in February 2002. Monitoring wells MW-1 through MW.-10 were monitored and sampled on 28 February 2002. In addition, a well-casing elevation survey was conducted on 05 March 2002. All field work was 1 • performed in accordance with guidelines issued by Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tank (UST) sites. 2.1. SOIL BORING AND MONITORING WELL INSTALLATION ' On 25 February 2002,one soil boring was advanced at the site. The soil boring was advanced using a Limited Access Drill Rig(LAR), equipped.with 8.25-inch diameter hollow-stem augers to install monitoring well MW-7. The drill rig and' three-man crew were supplied by West Hazmat Drilling Corporation. Auger returns generated by drilling were containerized in properly labeled DOT (Department of Transportation) -approved model 55-gallon drums and was stored on-site. 2:1.1. Soil Sample Collection and Analysis ' Soil samples were collected ahead of the drill bit using a California modified split-spoon sampler loaded with three pre-cleaned 2-inch by 6-inch brass' sleeves. The samples were collected from monitoring well boring MW-7 at five-foot intervals, beginning at 5 feet below surface grade (bsg) using a 140-pound hammer to advance,the sampler. The number of blows required to advance the sampler over each 6-inch increment of the 18-inch sampling interval was recorded on the boring ' logs. Sampling equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to minimize cross-contamination. ', Advanced GeoEnvironmental,Inc.