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1 <br /> lie26 October 2001 <br />' AGE-NC Project No 01-0839 <br /> Page 3 of 8 <br />' deposited in lacustrine,fluvial,and alluvial environments with sediment sources being the mountain <br /> ranges surrounding the valley(Olmsted and Davis, 1961) The site is located on unconsolidated and <br /> semi-consolidated alluvium,lake,playa and terrace deposits of Quaternary age(California Division <br />' of Mmes and Geology, 1977) <br /> The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin(Basin 5-22) <br /> 2 4 GROUND WATER DEPTH AND FLOW DIRECTION <br />' Based on information obtained from drilling activities, ground water depth beneath the site is <br /> approximately 70 feet bsg Based on information obtained from a nearby site (4696 East <br /> I Waterloo Road) the prevailing ground water flow direction in the vicinity of the site is inferred to <br /> be toward the east However, flow direction may be both locally and seasonably variable <br /> 3.0. PROCEDURES <br />' On 04 and 05 September 2001, five soil borings were advanced at the site as part of the assessment <br /> related to the former UST system The field work was conducted as outlined in the AGE work plan <br /> titled Preliminary Site Assessment Work Plan, dated 22 June 2001 <br /> 31 DRILLING <br /> On 04 and 05 September 2001, five soil borings (B-1 through B-5) were advanced at the site using <br />' a truck-mounted, CME-75 drill ng equipped with continuous flight 8 25-inch augers The dell ng <br /> and two-man crew were provided by Cascade Drilling of Rancho Cordova, California Boring B-1 <br /> was advanced to 40 feet bsg, boring B-2 was advanced to 90 feet bsg, boring B-3 was advanced to <br /> 70 feet bsg and bonngs B-4 and B-5 were advanced to 25 feet bsg Soil boring B-1 was advanced <br /> in the western portion of the former and existing UST area through a 12-inch diameter conductor <br /> casing During dnlling the soil cuttings began to disrupt the positioning of the casing and boring B-1 <br /> was abandoned at 40 feet bsg, 50 feet short of the proposed 90-foot total depth Boring B-2 was <br /> advanced fifteen feet west of boring B-1 to 90 feet bsg as a continuation of boring B-1 <br /> I <br /> Advanced Geo]Knvxronmenw,Inc <br />