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<br /> ' Site History & Background
<br /> New West Stations, Inc.
<br /> 6437 West Banner Street
<br /> Lodi, California
<br /> 1
<br /> ' The Site is an operating service station located on the north side of West Banner Street within the Flag
<br /> City commercial center that is located immediately southeast of the Interstate 5 over-crossing of Highway
<br /> 12. In 1996, Mr. J. Gilbert Moore and Ms. Eileen A. Moore installed the current USTs and the Site has
<br /> ' been a fueling facility since that date. Prior to Mr. and Mrs. Moore acquisition of the Site, it was a vacant
<br /> lot with no Site improvements. The Site dispenses fuel from two 10,000-gallon gasoline and one 20,000-
<br /> gallon diesel underground storage tanks (USTs) located in the southeastern portion of the property. Two
<br /> 1 fuel dispenser islands are situated between West Banner Street and the station building.
<br /> The area surrounding the Site is zoned for commercial use. Commercially developed properties
<br /> ' surrounding the Site include fueling stations and convenience stores, restaurants, hotels, and a fire station.
<br /> An active Chevron branded gasoline service station and an active Unocal branded gasoline service station
<br /> ' operate south and southwest, respectively, of the Site.
<br /> The Site is generally flat at an elevation of approximately 10 feet above mean sea level (ms]). The Site is
<br /> mostly asphalt paved with planted areas along the sides of the property and adjacent to the building. The
<br /> Site drainage flows into storm drains which eventually discharge into White Slough approximately one
<br /> mile west-southwest of the Site.
<br /> ' Currently there are twenty eight groundwater monitoring wells (MW-1, MW-2, MW-3A, MW-313, MW-
<br /> 3C, MW-4A, MW-413, MW-4C, MW-5A, MW-513, MW-613, MW-6C, MW-7A, MW-713, MW-8A, MW-
<br /> 813, MW-9A, MW-9B, MW-9C, MW-9D, MW-10A, MW-1013, MW-IOC, MW-IOD, MW-1113, MW-12A,
<br /> MW-13A, MW-13B)five extraction wells(EW-1 through EW-5)and two municipal wells (CSA-31-1 and
<br /> ' CSA-31-2) that are monitored and sampled on a quarterly basis since fourth quarter 2005. Groundwater
<br /> samples are collected and analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg), benzene,
<br /> toluene, ethylbenzene, and total xylenes(BTEX constituents), and the fuel additives Methyl-tertiary-Butyl
<br /> ' Ether(MTBE), Di-isopropyl Ether(DIPE),Tert-butyl Alcohol (TBA), Ethyl tert-butyl ether(ETBE), Tert-
<br /> amyl methyl ether(TAME), Ethanol, and Methanol by EPA Method 8260B.
<br /> ' Groundwater at the Site occurs at an approximate depth of 15 feet below ground surface (bgs). The Site
<br /> consists of three groundwater zones, upper (Zone A), intermediate (Zone B) and lower (Zone C).
<br /> Historically the groundwater flow in all three zones has been predominately to the east and southeast.
<br /> ' The groundwater treatment system operating at the Site extracts groundwater from the upper water
<br /> bearing zone. Four 4-inch diameter pneumatic pumps transfer groundwater from the subsurface through
<br /> ' three LGAC vessels to absorb any remaining hydrocarbons prior to disposal through the storm drain
<br /> system. The storm drain system discharges into White Slough. The current system configuration utilizes
<br /> two 2,000-Ib and one 1,000-Ib LGAC vessels. The treated groundwater is discharged into the storm drain
<br /> system with the approval of the Central Valley Regional Water Quality Control Board (CVRWQCB)
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