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' Quarterly Report - Fourth Quarter 2001 • 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 installation of four additional ground water monitoring wells, 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, former UST locations and monitoring well locations are illustrated on Figure 2.Background information is summarized in the Preliminary Site Assessment WorkPlan dated 30 November 1998 and Preliminary Investigation and Evaluation Report dated 10 August 1999, both prepared by AGE. 2.0. PROCEDURES Field work was performed in accordance with California Regional Water Quality Control Board - Central Valley Region (RWQCB) and San Joaquin County Environmental Health Department _ (EHD)guidelines for investigating underground storage tank(UST)sites and sampling ground water ' monitoring wells, respectively. 2.1. SOIL BORING AND MONITORING WELL INSTALLATION On 30 and 31 October 2001, AGE directed the advancement and completion of four soil borings as ground water monitoring wells:Three soil borings were advanced utilizing a truck-mounted drill rig and one boring(MW-8)was advanced with a limited access rig;both rigs were equipped with 8-inch diameter hollow stem augers. The drill rigs and crews were supplied by.West Haz-Mat Drilling ' Corporation of Rancho Cordova,'Califomia.The monitoring well locations are depicted in Figure 2. ' -2.1.1. Soil Sample Collection Discrete soil samples were collected at 5-foot intervals utilizing a California split-spoon sampler . ' loaded with three 2-inch by 6-inch brass sleeves (refer to boring logs for specific depths). The . sampler was driven by dropping a 140-pound weight from a height of 30 inches. The number of ' blows required to drive each 6-inch interval (blow counts)was recorded on boring logs by an AGE staff geologist. Soil samples were preserved by covering both ends of the second brass sleeve with Teflon sheets, capping and sealing with tape. Each preserved sample sleeve was labeled with soil boring location, • depth,time,date and sampler's initials and was stored in a chilled container under ice. Selected soil ' Advanced GeoEnvironmental,Inc.