WORK PLANS - Laserfiche WebLink

Home Browse Search

FACT SHEET RECEIVED NEW WEST PETROLEUM #1003 (FLAG CITY SHELL) OCT 24 2011 6437 West Banner Street, Lodi, California ENVIRO _ PERM SEftVIH CES lTH The New West Petroleum #1003 site (Flag City Shell) is an operating retail fueling service station located approximately 100 feet south of the intersection of California Highway 12 (Kettleman Lane) and Thornton Road, approximately 5 miles west of Lodi, California. The Flag City Shell site has operated as a retail fueling station since 1996, dispensing from two 10,000-gallon gasoline and one 20,000-gallon diesel underground storage tanks (USTs) located in the southeast portion of the property. In February 2005, the fuel additive methyl tertiary butyl ether (MTBE) was encountered in ground water monitoring wells located south of the Flag City Shell property. Thereafter, the San Joaquin County Environmental Health Department (EHD) directed Flag City Shell to investigate potential petroleum hydrocarbon (i.e. MTBE) impacts to soil and ground water. Between August 2005 and September 2008, a subsurface investigation was conducted on and off the site by installing a total of twenty-seven ground water monitoring wells. The preliminary results of the investigation indicated that an unauthorized release of the fuel additive MTBE had occurred near the south end of the Flag City Shell UST area. Additionally, MTBE impact to soil and ground water was found to have migrated to depths of 75 feet below grade and at distances of approximately 150 feet toward the east, southeast and south. Based on the investigation results, an estimated 260 pounds (or 42 gallons) of dissolved MTBE was initially estimated to have leaked into the subsurface. In May 2007, the California Regional Water Quality Control Board — Central Valley Region issued Cleanup and Abatement Order No. R5-2007-0709, and directed Flag City Shell to adequately mitigate and address all MTBE impact due to the close proximity (i.e. 850 feet toward the southeast) and upgradient direction of the MTBE impact to San Joaquin County Community Service Area Wells CSA-31-1 and CSA-31-2. As a result, a ground water extraction and treatment remediation system was installed at the site to mitigate ground water MTBE impact. The ground water remediation system was operational at the Flag City Shell site between September 2006 and August 2011. During this operational period, a total of 23,517,871 gallons of MTBE-impacted ground water was extracted, which resulted in the removal of 123.8 pounds of MTBE impact. By January 2010, influent ground water remediation MTBE concentrations steadily declined to near non-detect levels. Due to the declining MTBE concentrations, ground water remediation operations were terminated at the site in August 2011. The Flag City Shell case is under consideration for a no further action closure by the Regional Water Quality Control Board. Information for the site or public comments can be submitted to Mr. James Barton by email at (ibartonawaterboards.ca.00v), by phone at (916) 464-4615, or by mail at the Central Valley Regional Water Quality Control Board, 11020 Sun Center Drive #200, Rancho Cordova, California 95670. Written comments must be submitted to the CVRWQB no later than 23 November 2011.