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California Regional Water Quality Con Board '- <br /> Central Valley Region ' <br /> H% <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams - Arnold <br /> 11020 Sun Center Drive 4200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Secretaryfor phone(916)464-3291 •FAX(916)464-4645 <br /> Governor <br /> Environmental http://www.waterboards.ca.gov/centralvalley <br /> Protection <br /> 29 April 2009 RECH V ED <br /> Mr. Ronald Jr. and Ms. Bonnie Barber APR 3 0 2009 Ms. Donna Sartini-Gardner <br /> 10411 Small Rd. 1206 W. Struck Ave. <br /> Manteca, CA 95336 ENVIRONMENT HEALTH Orange, CA 92867 <br /> PERMIT/SERVICES <br /> DOCUMENT REVIEW, DONNA GARDNER PROPERTY, 26090 (AKA 26056) N. THORNTON ROAD, <br /> THORNTON, SAN JOAQUIN COUNTY(REGIONAL BOARD CASE#390412) <br /> 1 reviewed the Quarterly Ground Water Monitoring Report— First Quarter 2009 (Report), submitted <br /> 23 April 2009 by Mr. & Ms. Barber's consultant, Advanced GeoEnvironmental Inc. The Report provides <br /> the results of the first quarter 2009 groundwater monitoring event conducted on 30 March 2009. <br /> Petroleum hydrocarbons were only detected in one monitoring well (MW-4), and were reported as total <br /> petroleum hydrocarbons as gasoline (TPHg), 1,400 micrograms per Liter (ug/L); ethylbenzene, <br /> 5.0 ug/L; and xylenes, 6.7 ug/L. The Report recommends conducting groundwater monitoring during <br /> the second quarter of 2009 and preparation of a closure report. <br /> Comments: My 12 March 2009 letter stated, contingent upon the results of the first quarter 2009 <br /> sampling event, I may remove MW-2 from the second quarter 2009 monitoring event, and may remove <br /> additional analytes if results are non-detect. In addition to suspending monitoring for MW-2, the <br /> methyl tert-butyl ether (MTBE) analysis is suspended. Monitoring wells MW-4, MW-7 and the <br /> Thornton Supply Well #2 will be sampled for TPHg, benzene, ethylbenzene, toluene, and xylenes <br /> during the second quarter of 2009. <br /> My 12 March 2009 letter also stated that the second quarter 2009 monitoring report, due 30 July 2009, <br /> shall also include an evaluation of the monitoring well data trends over the previous four quarters, and <br /> if applicable, include the Report-recommended closure report written in accordance with Appendix A — <br /> Reports, Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of <br /> Underground Tank Sites, which you received as a paper copy during our 11 March 2009 meeting. The <br /> closure report shall also evaluate whether the potential for vapor intrusion exists, and address any risks <br /> to future site construction workers. I will evaluate the closure report, and if appropriate, suspend <br /> monitoring while closure is being considered. When directed, you will conduct a 45-day public <br /> participation period for the proposed closure and provide an approved notice to all property owners and <br /> tenants within 200 feet of the USTs. <br /> If you have any questions, please call me at (916) 464-4615 or you may reach me by email at <br /> ibarto n C6ilwaterboards.ca.gov. <br /> j'James L. L. Barton, P.G. <br /> Engineering Geologist <br /> cc: Mr. Mark Owens, State Water Resources Control Board, Sacramento <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. William Little, Advanced GeoEnvironmental Inc., 837 Shaw Rd., Stockton 95215 <br /> California Environmental Protection Agency <br /> 0a Recycled Paper <br />