ARCHIVED REPORTS_XR0005443 - Laserfiche WebLink

Home Browse Search

ort - Jul 1.998 Quarterly Rep y CALIFORNIA FUELS CARDLOCK STATION 2402 Pacific Avenue, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr David Atwater of Van De Poi Enterprises,Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for 2402 Pacific Avenue(the site) in Stockton, California The location of the site is illustrated in Figure 1, general features at the site are illustrated in Figure 2 The scope of work of this investigation included advancement of four soil borings, installation of three ground water monitoring wells, monitoring dissolved petroleum hydrocarbon concentrations in ground water and characterization of ground water flow direction and gradient at the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services -Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board for investigation of underground storage tank(UST) sites Background information and a description of prior investigations at the site was included in AGE's Closure Corrective Action Plan-May 1998, dated 05 May 1998 r� 2.0. PROCEDURES 2 1 Drilling Activities On 01 through 03 July 1998, four soil borings (B 10, MW-10, MW-11 and MW-12) were advanced on and off-site as part of ongoing site assessment activities related to the former UST facility Soil boring B10 was advanced vertically to 95 feet below surface grade (bsg), soil borings MW-10 through MW-12 were advanced vertically to maximum depths of 70 feet bsg Soil borings were advanced utilizing a B-75 truck-mounted drill rig equipped with 8-inch diameter hollow stem augers The drill rig and two-man crew were supplied by Mitchell Drilling Environmental of Rancho Cordova, California During drilling activities, all soil cuttings were covered with plastic sheeting in an area at the site lacking public access The soil boring/monitoring well locations are depicted in Figure 2 2 1 1 Soil Sample Collection Discrete soil samples were collected at 5-foot intervals, beginning at 75 feet bsg from soil boring B 10 and beginning at 15 feet bsg.from soil borings MW-10,MW-11 and MW-12 Soil samples were collected utilizing a California split-spoon sampler loaded with 2- by 6-mch brass sleeves 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 length of the sampler(blow counts)was recorded on boring logs