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Mr. Gurjinder Singh Sohal #3 February 28, 2019 - Page 2 The property owner is Mr. Gurjinder Singh, Sohal #3, 2494 East Fremont Street, Stockton, California, 95205, (408) 888-2092. The general contractor contact is Mr. Doug Young Confidence UST Services, Inc., 16250 Meacham Road, Bakersfield, California 93312, (661) 631-3870. The environmental consultant is Mr. Mark R. Magargee, PG, CHg, 6730 Canaletto Avenue, Bakersfield, California, 93306, (661) 205-7000. The Certified Unified Program Agency (CUPA) contact is Ms. Elena Manzo, San Joaquin County Environmental Health Division, 1868 East Hazelton Avenue, Stockton, California 95205, (209) 952-7699. BACKGROUND GEOLOGY The site is at an elevation of approximately 25 feet above sea level (ASL)with a slight slope to the west- southwest (see Figure 1). The site is located in the central portion of the Great Valley geomorphic province, a north-south-trending valley approximately 400 miles long by 50 miles wide, the southern portion of which is referred to as the San Joaquin Valley. The surface of the San Joaquin Valley is composed primarily of unconsolidated, Pleistocene (1.6 million to 11,000 years ago) and Recent (11,000 years ago to the present) alluvial sediments. Beneath the alluvial sediments are older, predominantly lake bed deposits. These lie unconformably on Mio-Pliocene marine sediments, which extend to a crystalline basement at a depth of less than 5,000 feet below grade (fbg). At the subject site, surface deposits consist of Quaternary (recent) unconsolidated alluvium overlying Quaternary (Pleistocene) nonmarine sediments. Geologic deposits in the study area include Pleistocene alluvial sediments that form a homocline dipping gently to the west-southwest. The deposits are alluvium consisting of lakebed deposits interbedded with poorly indurated and dissected fan deposits. The alluvium consists of significant development of silts and clays lakebed deposits, with intervals of silty sands and fine-grained to coarse-grained sands. Previous investigations at the site indicated silts and clays with thin interbeds of silty sands and fine-grained to coarse-grained sands. HYDROGEOLOGY The site is located within the San Joaquin River Subbasin of the San Joaquin Valley Groundwater Basing. Surface water and groundwater in the San Joaquin Valley are derived predominantly from the Sierra Nevada to the east and are transported by five major rivers, the closest to the site being the San Joaquin River. The site is three miles east of the San Joaquin River, Groundwater is present within alluvial sediments. The depth to first groundwater at the site is approximately 25 fbg. Regional groundwater flow is to the west-southwest toward the axis of the San Joaquin Valley. Groundwater below and surrounding the site is designated for beneficial usage. The groundwater has existing uses for domestic and municipal supply, industrial service and process supply, and agricultural purposes. Municipal water is supplied to the site and all surrounding properties.