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Quarterly Report - August 1998 ' ' WEST CLAY PROPERTIES 639 West Clay Street, Stockton, California ' 1.0. INTRODUCTION u'At the the request of Ms Tina Mayhew of West Clay Properties,Advanced GeoEnvironmental, Inc ' (AGE)has prepared this Quarterly Report for the property located at 639 West Clay Street, Stockton, California One single-completed and two dual-completed wells were installed at the site in August ' 1998 Ground water monitoring was performed on 31 August and 01 September 1998 The site and ' the surrounding area are illustrated in Figure 1-Location Map Structures, well and boring locations are illustrated on Figure 2 - Site Plan ' The Quarterly Report is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control ' Board (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites Background information is summarized in the Quarterly Monitoring Report and Data Summary- December 1997, prepared by AGE 2.0. PROCEDURES 21 DRILLING AND SAMPLING ' On 26 and 27 August 1998, three soil borings were advanced at the site Borings MW-6 and MW-8 were advanced to a depth of 45 feet below surface grade (bsg) using a B-53 drill rig equipped with ' 8 25-inch diameter hollow-stem augers Boring MW-7 was advanced to a depth of 30 feet bsg The drill ng 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 Ipending 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 5 feet bsg in borings MW-6 and MW-7 and beginning'at a depth of 15 feet bsg in boring MW-8, 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 Iavoid 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 analytical laboratory Selected samples were analyzed for I i Advanced GeoEm ironmental,Inc I