WORK PLANS - Laserfiche WebLink

Home Browse Search

30 January 2014 AGE Project No . 99-0682 Page 2 of 28 The Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the q north . The surficial and upper several hundred feet of subsurface layers consists of a great thickness of predominantly unconsolidated alluvial and flood plain deposits (primarily sands , silts, and clays) of Quaternary age, which are derived from the granitic mountains of the Sierra Nevada . Beneath the upper sedimentary deposits lies a thick sequence of marine deposits of Mesozoic age. These marine deposits are further underlain by a pre- Jurassic complex of igneous and metamorphic basement rock. The Province is subdivided into two major divisions , designated the Sacramento and San Joaquin Valleys . The San Joaquin Valley is drained primarily by the San Joaquin River, and the Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic groundwater in the 13 , 500-square mile San Joaquin Valley Groundwater Basin (Basin 5-22 ). The nearest surface water feature in the vicinity of the property is McCleod Lake, located approximately 1 ,500 feet southwest of the site . Based on the United States Department of Agriculture - Natural Resources Conservation Service's Web Soil Survey map, surface sediment at the site area is classified as Jacktone-Urban land complex soil . The soils formed in fine textured alluvium from mixed igneous and sedimentary rock sources . The Jacktone series, found on basin rims and in basins, consists of moderately deep to hardpan , somewhat poorly drained soils formed in alluvium from mixed sources . The sedimentary units at the site are relatively horizontal and continuous . Based on quarterly groundwater monitoring events conducted at the site beginning in June 2000, groundwater has generally been encountered at depths between 24 feet to 35 feet below surface grade (bsg ) . The shallow and intermediate groundwater flow direction at the site has generally been oriented toward the east/northeast. Groundwater is considered to be of beneficial use and is used for domestic, industrial and commercial purposes . Based upon data obtained from San Joaquin County Flood Control District and Water Conservation District (FCD&W CD ) Lines of Equal Elevation of Groundwater Fall 2008 map, the prevailing groundwater flow direction in the vicinity of the site is estimated to be northeast. However, flow direction may be both locally and seasonably variable. 2 2 UNDERGROUND STORAGE TANK REMOVALS Pn 27 May 1991 , one 3, 000-gallon diesel underground storage tank (UST) , one �JJ 3, 000-gallon unleaded gasoline UST, one 3 , 000-gallon leaded gasoline UST and one 0 Advanced GeoEnvironmental, Inc. V � _i