Laserfiche WebLink
25 August 1997 <br /> AGE-NC Project No 95-0173 <br /> Page 2 of 6 <br /> Impacted soil was encountered in three of the six probe borings (B-3, B-4 and B-6), impacted <br /> ground water was encountered in four of six probe borings (B-3, B-4, B-6 and B-7) <br /> In June 1997, five ground water monitoring wells and two soil vapor extraction wells were <br /> installed both on and off-site Substantially impacted soil was encountered in three of the <br /> seven well locations (VW-1, VW-2 and MW-6), impacted ground water was encountered in <br /> three of the seven wells (MW-6, MW-8 and MW-9) <br /> 23 REGIONAL GEOLOGIC SETTING <br /> According to the Geologic Map of California, published in 1977 by the State of California <br /> Department of Mines and Geology, the site area is within the Great Valley Geomorphic Province of <br /> California, a large, elongate, northwest trending structural trough The Great Valley Pro,,i.ice has <br /> been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to <br /> present day, creating a nearly flat lying alluvial plain extending from the Tehachapi Mountains in the <br /> south to the Klamath Mountains in the north The western and eastern boundai ies of this province <br /> are comprised of the California Coast Range and the Sieria Nevada, respectively The Great Valley <br /> Province is subdivided into two major divisions designated the Saciamento and San Joaquin Valleys <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 /> Jacktone-Hollenbeck-Stockton (JHS) association The JHS soils are located within basins, and <br /> generally consist of moderate to poorly drained fine textured soils The sols are generally derived <br /> from both marine and non-manne sediment, and are generally formed in alluvium-derived from mixed <br /> rock sources <br /> 2 4 GROUND WATER DEPTH AND GRADIENT <br /> According to the map titled Lines Of Equal Depth To Groundwater-Spring 1996, published by the <br /> San Joaquin County Flood Control and Water Conservation District, the estimated depth to ground <br /> water at the prOp-eity 1S appioYsisidteiy 45-feet below surface grade (Dsgj The prevaiiing grouna <br /> water flow direction in central Stockton is generally toward the northeast, although ground water <br /> flow directions may vary locally and seasonably <br /> Historical ground water monitoring data collected at the site suggests that the water-table surface <br /> beneath the site occurs at a depth of approximately 30-feet below surface grade (bsg) <br /> • <br /> Advanced GeoEm'LroIunentai,Inc <br />