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INTENTIONAL TECHNOLOGY CORPORATION <br /> 2 . 2 HYDROGEOLOGY <br /> The site is located at about 20 feet above mean sea level . It is <br /> located in an almost flat area underlain by unconsolidated clay, <br /> silt, and some sand which were deposited in flood basins (USGS <br /> Professional Paper 1401-C) . <br /> San Joaquin County maps (Flood Control and water Conservation <br /> District, Spring 1990 and Fall 1990) indicate that groundwater <br /> beneath the site rises to 50 feet (below ground surface) in the <br /> spring and falls to 78 feet in the fall . Groundwater flows from <br /> south-southeast to east seasonally. varying seasonally . Both <br /> depth to groundwater and groundwater flow directions are strongly <br /> influenced by groundwater withdrawal in the region . <br /> 2 . 3 HISTORY <br /> BP Station 11190 was acquired from Mobile Oil in 1989 . The age <br /> of the station is uncertain . <br /> The station has four single wall fiberglass USTs (Figure 2) : <br /> • Tank No . 1 - 12, 000 gallons unleaded <br /> • Tank No . 2 - 10, 000 gallons unleaded <br /> • Tank No . 3 - 6, 000 gallons leaded <br /> • Tank No . 5 - 1, 000 gallons diesel <br /> A fifth tank (Tank No . 4) containing used oil was removed in <br /> 1987 . Soil from the bottom of the excavation contained no <br /> hydrocarbons at the level of detection . <br /> Inspection records note that tanks 2 and 5 failed pressure tests <br /> and that the diesel fuel dispenser (located on the eastern end of <br /> the outer pump island) had a cracked impact housing dispenser. <br /> On the basis of these results, an Underground Storage Tank <br /> Unauthorized Release (leak) Contamination Site Report was filed <br /> in December 1988 with San Joaquin County Public Health Services . <br /> 2 <br /> MA:ENG : 9284MER/050691 <br />