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1 <br /> 6 July 1999 <br /> AGE-NC Project No. 99-0616 <br /> ' Page 2 of 5 <br /> ' lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains <br /> in the north. The western and eastern boundaries of this province are comprised of the California <br /> Coast Range and the Sierra Nevada Mountains,respectively. <br /> ' Based on a General Soil Map from the San Joaquin County Soil Survey, published by the United <br /> States Department of Agriculture Soil Conservation Service in 1992, soil at the site area belongs to <br /> the Jacktone-Hallenbeck-Stockton (JHS) association. JHS soils are located within basins, and <br /> generally consist of moderate to poorly drained fine textured soils. JHS soils generally formed from <br /> mixed rock sources. <br /> ' 2.3. GROUND WATER DEPTH AND GRADIENT <br /> Based upon the San Joaquin County Flood Control Map Lines of Equal Depth in Water Wells - <br /> ' 1996, ground water depth in the area of the site is approximately 70 to 80 feet below surface grade. <br /> The regional ground water flow direction in the area of the site is toward the south-southeast. <br /> However, it is likely that flow direction at the site is influenced by agricultural pumping and may <br /> ' vary seasonally. <br /> ' 3.0. PROCEDURES <br /> This investigation was performed in accordance with the guidelines of both the San Joaquin County <br /> ' Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley <br /> Regional Water Quality Control Board for the investigation of underground storage tank(UST) sites, <br /> ' and was conducted as proposed in AGE's Preliminary Site Assessment Work Plan dated 7 June 1999 <br /> as approved by the PHS-EHD. <br /> ' 3.1. SCOPE OF WORK <br /> ' The scope of work for this preliminary site assessment included the advancement of one soil boring <br /> to collect soil samples for laboratory analysis to assess the vertical extent of hydrocarbon-impacted <br /> soil if encountered. Following refusal of the geoprobe at 10 feet, an 8-inch auger boring was drilled <br /> ' one foot north of the probe boring to a depth of 30 feet bsg. Soil samples were collected for analysis <br /> and description. This work is intended to define the vertical extent of hydrocarbon-impacted soil, <br /> ' if any, in the former gasoline farm tank location. <br /> ' Advanced GeoEnvironmental, Inc. <br /> 1 <br />