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I Y ' - August 1998 QuarterlyReport P g . FORMER CHASE CHEVROLET (MADISON) FACILITY 423 North Madison Street, Stockton, California ' 10. INTRODUCTION ' At the request of Mr Jeffery Setness of Hartmann & Setness,Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report summarizing field activities performed during the third quarter of 1998 at 423 North Madison Street, Stockton, California The scope of work included the t installation of three dual-completed ground water monitoring wells, monitoring concentrations of dissolved petroleum hydrocarbons in ground water on the site and preparation of this report The site setting is illustrated in Figure 1 - Location Map Structures and monitoring well locations are illustrated in Figure 2 -Site Plan Field activities were performed in accordance with guidelines for investigation of underground ' storage tank(UST) sites established by the Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) and by the San Joaquin County Public Health Services - Environmental ' Health Division (PHS-EHD) Background information was summarized in the Revised Corrective Action Plan - February 1997 and Site Investigation Report - UST No 8, dated 10 February 1998 both prepared by AGE 2.0 PROCEDURES 2 1 DRILLING AND SAMPLING ' On 19 through 23 June 1998, three soil borings were advanced at the site Borings MW-19, M W-20 and MW-21 were advanced to a depth of 55 feet below surface grade (bsg) using a B-53 drill rig equipped with 8 25-inch diameter hollow-stem augers The drill rig and three-man crew were ' ' supplied by Central Valley Drilling (CVD) of Rancho Cordova, California Auger returns generated by drilling were placed on plastic sheeting and stored on-site pending laboratory analysis ' Soil samples were collected ahead of the drill bit using a split-tube sampler loaded with three pre- cleaned 2-inch by 6-inch brass sleeves The samples were collected at five-foot intervals, beginning at a depth of 15 feet bsg in borings MW-19 and MW-20 and beginning at a depth of 5 feet bsg in boring MW-21,using a 140-pound hammer to advance the sampler 18 inches The number of blows required to advance the sampler in 6-inch increments was recorded on the boring logs Sampling ' equipment was washed in an Alconox solution and rinsed with water prior to each sampling run to avoid cross-contamination ' For each sample,both ends of the leading sleeve were covered with Teflon sheets, capped and sealed with tape The samples were labeled, stored on ice and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified r Adranced GeoEmironmenial Inc