ARCHIVED REPORTS_XR0006846 - Laserfiche WebLink

Home Browse Search

06/25/2001 14 46 2094671 AGE STOCKTON • PAGE 03 . 22 Juno 2001 AGE-NC Project No 97-0333 Page 5of10 2 4 REGIONAL GEOLOGIC SETTING Y The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sedunent ranging in age from Jurassic to Recent,creating a nearly flat- lying alluvial plain,extending from the Tehachapi Mountams m the south,to the Klamath Mount-mns in the north The westerion and eastern boundaries of this province are comprised of the Califonua Coast Range and the Sierra Nevada,respectively hocks composing the basement complex of the province have not been completely defined but are believed to be metarnorpluc and igneous in origin The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively Based on the General Soil Map from the Sart Joaquin County Soil Survey,published by the United States Department of Agriculture Soil Conservation Service in 1992,the site area is within the Delhi- Ventas-Tinnin(DVT) association. The DVT soils are located within dunes, alluvial fans and stream terraces along the Stamslaus River, and generally consist of well drained coarse textured soils The soils are generally derived from both tuarnne and non-matnne sediment, and are generally formed in alluvium dernved from granitic and mixed rock sources 2 5 GROUND WATER DEPTH AMD GRADIENT The estimated depth to ground water at the site is between 15 and 20 feet below surface grade (bsg) based on information from Lines of Equal Depth of Mater Mells Sprang 1998, published by the San Joaquin County Flood Control District and Water Conservation District(SJCFCD) Based on review of a regional ground dater elevation map published by the SJCFCD, the prevailing ground water flow direction m Manteca is generally toitiard the north, although flow directions maybe both locally and seasonably variable Depth to ground water �,N as measured a1 approxunately 16 feet bsg dunug a 31 January 2001 grouxid w ater monitoring e-%ent at the site, ground water flow direction was inferred towards the-north at a gradient of 0 001 3.0 SCOPE OF NNORK Basec on three gtoulid w aten sarnplmg events and data collected during the CPT wvestngation, fuel compotnent-impacted grouzid after appears to have migrated at least 60 feet north of the site (P-10) and vencca% to depths of at least 140 feet bsg (P-8), f ulherrnoi e, a municipal drinking water n ells �s locaieci approximately ;,500 fr-ci south of tl,e sire and a second mLinicipal uatei well is located Advanced Geo£rkvi eonrne