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too <br /> 02 October 2000 <br /> AGE-NC Project No. 00-699 <br /> Page 3 of 8 <br /> California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement <br /> complex of the province have not been completely defined but are believed to be metamorphic and <br /> igneous in origin. The northern and southern portions of the Great Valley Province have been <br /> designated the Sacramento and San Joaquin Valleys,respectively. <br /> Based on the General Soil Map from the San Joaquin County Soil Survey,published by the United <br /> States Department of Agriculture Soil Conservation Service in.1992, the site area is within the <br /> ,i Jackson-Hallenbeck-Stockton (JHS).association. The JHS soils are located within basins, and <br /> generally consist of moderate to poorly drained fine textured soils. The soils are generally derived <br /> from both marine and noxi-marine sediment, and are generally formed in alluvium derived from <br /> mixed rock sources. <br /> ,L, The Modesto,Riverbank,Turlock Lake Formations and overlying recent alluvium are the principal <br /> source of domestic ground water in the 13,500-square-mile San-Joaquin Valley Ground Water Basin <br /> (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest surface water <br /> feature in the vicinity of the-property is the Smith Canal located approximately 1,000 feet south of <br /> the site. <br /> 2.5. GROUND WATER DEPTH AND FLOW DIRECTION <br /> During both the Espana and AGE investigations, groundwater was encountered at a depth of <br /> approximately 59 feet bsg.Based upon the map Lines ofEqual Elevations ofDepth to Ground Water <br /> -Fall 1998,prepared by the San Joaquin County Flood Control Agency,the prevailing ground water <br /> flow direction in the vicinity of the site is to the west-southwest. However, flow direction may be ' <br /> both locally and seasonably variable. <br /> r 3.0. PROCEDURES <br /> One groundwater monitoring well was installed on 25 June 2000.The groundwater monitoring well <br /> was purged and sampled on 03 July 2000.Field work was performed in accordance with PHS-EHD <br /> approved Preliminary Site Assessment WorkPlan dated 31 March 2000,and approved through PHS- <br /> EHD by letter dated 15 May 2000. <br /> t. - <br /> 3.1. DRILLING AND SAMPLING <br /> r ' <br /> _- In June 2000, one pilot soil boring was advanced at the site between the former UST pit and a <br /> h domestic well located in the northeast coiner of the property. The soil boring is located <br /> Advanced GeoEnvironmental,Inc.' <br /> L.r , <br />