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<0111b California !gional Water Quality Con )1 Board <br />Central Valley Region <br />Karl E. Longley, ScD, P.E., Chair <br />Linda S. Adams <br />Secretary for <br />Environmental <br />Protection <br /> <br />11020 Sun Center Drive 4200, Rancho Cordova, California 95670-6114 <br />Phone (916) 464-3291 • FAX (916) 464-4645 <br />http://wnEr itey <br />Arnold <br />Schwarzenegger <br />Governor <br />4 November 2009 NOV 0 6 2009 <br />ENVIRONMENT HEALTH <br />PERM1T/SERVICES Mr. Ronald Jr. and Ms. Bonnie Barber <br />10411 Small Rd. <br />Manteca, CA 95336 <br />Ms. Donna Sartini-Gardner <br />1206 W. Struck Ave. <br />Orange, CA 92867 <br />DOCUMENT REVIEW, DONNA GARDNER PROPERTY, 26090 (AKA 26056) N. THORNTON ROAD, <br />THORNTON, SAN JOAQUIN COUNTY (CASE # 390412) <br />I reviewed the Closure Summary Report (Report), submitted 30 October 2009 by Mr. & Ms. Barber's <br />consultant, Advanced GeoEnvironmental Inc. The Report was written in accordance with Appendix A — <br />Reports, Tr-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of <br />Underground Tank Sites. The Report evaluated the lack of threat from vapor intrusion, due to the <br />11 foot plus depth of residual soil contamination, which also limited risk from direct exposure to future <br />site construction workers. The Report included a list of all property parcels located within 200 feet of <br />your defined hydrocarbon plume, with the name of the property owner for each parcel, and a mailing <br />address for each owner; and also included a map depicting your site, the extent of your identified <br />hydrocarbon plume, and all parcels located within 200 feet of your defined hydrocarbon plume. An <br />estimated 0.24 lbs. of Total Petroleum Hydrocarbons as gasoline (TPHg) remain in groundwater, with a <br />stable plume and declining trend in TPHg groundwater concentrations. The Report estimated time to <br />reach Water Quality Goals as two years. After 20 years of groundwater monitoring, the nearby County <br />Municipal Supply Well (Thornton #2) has not been impacted by petroleum hydrocarbons; while pump <br />testing of Thornton #2 has shown that there is little communication between the petroleum <br />hydrocarbons impacted first water aquifer and the main water supply aquifer. The proposed low risk <br />closure is protective of water quality, human health and the environment. The Report recommends <br />suspending investigations, consideration for a low risk case closure, and destruction of monitoring and <br />remediation wells. <br />The Report is acceptable. Effective immediately, groundwater monitoring is suspended while we <br />complete the next step in the closure process, public participation. We will notify you in writing when <br />public participation is complete, and will authorize well destruction if appropriate. <br />If you have any questions, please call me at (916) 464-4615 or you may reach me by email at <br />jba7tonwaterboards.ca .qov. <br />James L. L. Barton, P.G. <br />Engineering Geologist <br />CC: Robert L'Heureux, State Water Resources Control Board, Sacramento <br />Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br />William Little, Advanced GeoEnvironmental Inc., 837 Shaw Rd., Stockton 95215 <br />California Environmental Protection Agency <br />Z3 Recycled Paper