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' Site Background Information Prem Dor w Page 6 of 7 thm, discontinuous lenses of cemented sand and stiff, fine-grained material encountered at ' approximately 12 feet, 15 feet, and 17 feet bsg in the central portion of the site Hydrolo c Unit 1 (11U 11-At the top of the current saturated zone,HU 1 extends from approximately ' 18 5 feet bsg to between 23 feet and 25 feet bsg and is comprised pnmanly of fine-grained sediments (silt, clay, clayey silt, and silty clay) Pore pressure is low throughout the zone ' Hydrologic Unit 2(HU2)-HU2 extends from between 23 feet and 25 feet to approximately 29 feet bsg and is composed primarily of fine-to coarse-grained sandy sediments(sand and silty sand),grain size appears to increase with depth This unit exhibits low pore pressures and may be considered a ' now unit ' Hydrologic Unit 3 (HU3) - Extending from the base of HU2 to approximately 66 feet bsg, HU3 consists of silt, clay, clayey silt, and silty clay exhibiting moderate pore pressures Soil samples collected at 30 feet and 35 feet bsg descnbe a fat,blue-gray clay with high plasticity, consistency, ' and toughness which may act as a confining layer Additionally,a thin,discontinuos layer of sandy material is described at approximately 34 feet bsg in borings MW-4 and MW-5, and a thin (approximately 1 foot to 2 feet thick)layer of sandy sediments and stiff, fine-grained material was ' . encountered at approximately 52 feet bsg in this unit This unit exhibits low to moderate pore pressures ' Hy*ologic Unit 4 4 -HU4 consists of a layer of silty sand and sand extending from 66 feet bsg to 72 feet bsg This zone is characterized by low pore pressures and may be considered a flow unit ' Hydrologic Unit 5 (HU5) -Extending from 72 feet bsg to the total depth of boring CPT-1 (97 feet bsg),the top of HU5 consists of a 4-foot thick layer of silt with alternating layers of clayey material (clay, silty clay, and clayey silt) and stiff, fine-grained material extending to the total depth of the ' boring This zone is characterized by moderate to high pore pressures SENSITIVE RECEPTOR SURVEY On 10 April 2004, an AGE representative reviewed well driller's reports from the California ' Department of Water Resources - Central District for water wells located in the surrounding area Driller's reports for 14 water wells located within a 2000-ft radius of the site were identified 1 ' On 01 December 2004, Mr Rodney Estrada of San Joaquin County Environmental Health Department was contacted by an AGE representative for records of septic systems or permits for ' wells located on the site property No septic system or well permits were located for the subject property • Advanced GeoEnviroamental,Inc. 1