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Linda S. Adams <br />Secretary for <br />Environmental <br />Protection <br />Arnold <br />Schwarzenegger <br />Governor <br />California -!gional Water Quality Cor 11 Board <br />Central Valley Region <br />Karl E. Longley, ScD, P.E., Chair <br />11020 Sun Center Drive #200, Rancho Cordova, California 95670-6114 <br />http://www.waterboards.ca.goy/central <br />--1EE2B <br />Phone (916) 464-3291 • FAX (916) 464- <br />C V <br />5 November 2009 <br />To Distribution List <br />NOV 1 0 2009 <br />ENVIRONMENT HEALTH <br />PERMIT/SERVICES <br />NOTIFICATION OF PROPOSED LEAKING UNDERGROUND STORAGE TANK (LUST) <br />CASE CLOSURE, FORMER GARDNER PROPERTY, 26090 THORNTON ROAD, <br />THORNTON, SAN JOAQUIN COUNTY (CASE # 390412) <br />Staff at the Central Valley Regional Water Quality Control Board is considering closure of <br />Lust's Case No. 390412 for the unauthorized release of petroleum hydrocarbons (gasoline) at <br />26090 Thornton Road in Thornton, California. In 1989, three underground tanks were removed <br />from the subject site. During removal, gasoline was observed to have leaked from the tanks, <br />which eventually migrated to groundwater beneath the site. Following a period of groundwater <br />monitoring and active remediation consisting of soil excavation, soil vapor extraction, and air <br />sparging in groundwater, the gasoline decreased significantly in concentrations. Because the <br />minimal remaining concentration levels do not adversely impact groundwater quality or human <br />health and safety at the subject and adjacent properties, no further action related to the former <br />tank release has been requested at this time. However, the case will remain open to allow time <br />for affected/interested property owners to comment on the proposed case closure. Therefore, <br />if you have any comments regarding the closure of this case, please submit them to me by <br />24 December 2009 at the following address: <br />Regional Water Quality Control Board — Central Valley Region <br />10020 Sun Center Drive #200 <br />Rancho Cordova, CA 95670 <br />Once your comments are received, we will review them to determine the proper forum to <br />address your concerns. If your comments are not received by the specified date, we will <br />complete our case closure process and issue a No Further Action Required letter to the parties <br />responsible for the site. If you have any questions or concerns regarding this case, please call <br />me at (916) 464-4615 or you may reach me by email at jbarton@waterboards.ca.gov . <br />E, o <br />James L. L. Barton, P.G. / <br />Engineering Geologist <br />cc: Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br />Ronald Jr. and Bonnie Barber, 10411 Small Rd., Manteca 95336 <br />Donna Sartini-Gardner, 1206 W. Struck Ave., Orange 92867 <br />William Little, Advanced GeoEnvironmental Inc., 837 Shaw Rd., Stockton 95215 <br />California Environmental Protection Agency <br />Ct Recycled Paper