COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

1.0 INTRODUCTIO 1.1 History and Release Discovery An illicit discharge of diesel fuel to the storm drain system of Lionudakis, Firewood, Inc. (Site)was reported to San Joaquin County in 2007. The alleged discharge was reported to have entered a storm drain inlet located north of the above ground storage tanks (ASTs) and entered a storm water basin. The ASTs are located on the west side of a 3.22-acre parcel (APN 247-120-20) and the storm water basin was located on the west side of a 9.63-acre parcel (APN 247-120-08). The storm water basin previously located on the west side of a 9.63-acre parcel (APN 247-120-08) was backfilled and abandoned in July 2007. The effluent piping to the abandoned storm water basin was removed and the storm drain system routed to a new storm water basin constructed on the northern end of a 10-acre parcel (247-120-06). A vicinity map is included as Figure 1 and a San Joaquin County Parcel map of the area is included as Figure 2. 1.2 Hydrogeologic Setting The Site is situated in the northern portion of the San Joaquin Valley (SJV) part of the Great Valley Geomorphic Province (GVP). The GVP, an elongated lowland nearly 500 miles long and 50 miles wide, lies between the Sierra Nevada Province to the east and Coast Ranges Province to the west. The GVP stretches from Red Bluff to Bakersfield and is bordered by the Klamath Mountains Province to the north and the Transverse Ranges Province to the south (Norris and Webb, 1990). The near surface geology, typical of the SJV, is comprised of unconsolidated alluvial deposits of Pleistocene to Holocene age consisting of intercalated beds of gravel, sand, silt and clay. The thickness of the older alluvium in the Escalon area averages approximately 450 feet. Underlying the older alluvium are Plio/Pleistocene continental deposits of similar derivation and lithology. The older alluvium functions as the most important aquifer in the site area(USGS, 1986). Soils developed on the alluvium are generally well drained, differing from the parent material only in the increased volume of organic matter (DWR, 1967). The soil type in this area is well drained to somewhat excessively drained, coarse textured and moderately coarse textured soils that are deep to a cemented hardpan or are very deep; on dunes, alluvial fans and low fan terraces (USDA, 1992). The important bodies of surface water in proximity to the site are the Stanislaus, Tuolumne, and San Joaquin Rivers. The Stanislaus and Tuolumne Rivers are located approximately 2 I/2 and 10 %2 miles south of the site, respectively. These two rivers flow in a westerly direction and are tributaries to the San Joaquin River, located approximately 14 miles west of the site. The northerly flowing San Joaquin River drains the San Joaquin Valley. Existing and potential beneficial uses of these surface water bodies include domestic water supply, irrigation, industrial supply, groundwater recharge, freshwater replenishment, hydroelectric power, recreation, freshwater habitat, wildlife, fish migration, and fish spawning(CRWQCB, 1991). The existing and potential uses of groundwater in the area include irrigation, private and municipal water supply, stock watering, process water, and service supply (CRWQCB, 1991). The "older alluvium" is the most extensively developed geologic unit in the area and hosts both unconfined and confined zones. The unconsolidated, mostly coarse grained nature of the aquifer material results in high well yields. Specific capacities of wells completed in the older alluvium average 42 G:IGROUNDZEILIONUDAKISIReportslSite Assessment and Excavation Report.doc March 2010