WORK PLANS - Laserfiche WebLink

Home Browse Search

Site Background Information - Grewal's Market Page 2of6 REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS According to Geologic Map of California, published in 1977 by the. State of California Department of Mines and Geology, the site area is located within the Great Valley Geomorphic Province of California. The Great Valley Province is a nearly flat, elongated structural trough trending northwest and southeast for approximately 450 miles; it is ' bounded on the east by the Sierra Nevada mountains and on the west by the Coast . Ranges. 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 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 ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5=22). The nearest surface water feature in the vicinity of the property is McLeod Lake, located approximately 2,100 feet west 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 Yellowlark gravelly loam. The Yellowlark series consists of deep to hardpan, moderately well drained soils that formed in alluvium derived from mixed rock sources; Yellowlark soils are on intermediate fan terraces and stream terraces. Based on quarterly ground water monitoring events conducted at the site beginning in August 2002,ground water is currently encountered at approximately 27 feet below surface grade (bsg) and flows consistently northeast. Ground water is considered to be of beneficial use and is used for domestic, industrial and commercial purposes. UNDERGROUND STORAGE-TANK REMOVAL On 27 July 1998, one 6,000-gallon diesel UST, one 6,000-gallon gasoline UST, one 10,000-gallon gasoline UST and the associated fuel dispensers and product piping were removed from the site and replaced with two 12,000-gallon gasoline/diesel USTs. Advanced CeoEnvironmental,Inc.