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California Refonal Water Quality Antrol Board <br /> 0 Central Valley Region <br /> Robert Schneider,Chair Arnold <br /> Alan C.Lloyd,Ph.D. Schwarzenegger <br /> Secretaryfor Fresno Branch Office Governor <br /> Environmental 1685 E street,Fresno,California 93706 <br /> Protection (559)445-5116•Fax(559)445-5910 <br /> http://www.waterboards.ca.gov/cmtralvalley 'D,E C E ��D <br /> 31 January 2006 <br /> FEB 2 [006 <br /> M. Scott Mansholt ENVIRONMENT HEALTH <br /> Chevron Environmental Management Company PERMIT/SERVICES <br /> 6001 Bollinger Canyon Road <br /> Rm K2066 <br /> San Ramon, California 94583-2324 <br /> REVIEW OF MONITORING WELL DESTRUCTION WORKPLAN,ALDENPARK, TRACY,SAN <br /> JOA QUIN COUNTY <br /> Central Valley Regional Water Quality Control Board staff has reviewed the referenced document for <br /> destruction of four monitoring wells (MW-1/KJC, MW-2, MW-13 and MW-17) located at Chevron's <br /> Alden Park project site. The report, dated 26 January 2006,was submitted by Science Applications <br /> International Corporation(SAIC) on behalf of Chevron. <br /> Groundwater monitoring is conducted in accordance with Monitoring and Reporting Program R5-2003- <br /> 0801 and includes 21 monitoring wells associated with the project. SAIC proposed the four wells for <br /> destruction that are described as being redundant and not necessary for monitoring purposes. Review of <br /> historical results indicates these wells have been consistently non-detect or contain very low petroleum <br /> concentrations, and/or are less than water quality objectives since sampling commenced in 1997. <br /> The remaining monitoring wells will be sampled on a semi-annual frequency in accordance with the <br /> Monitoring and Reporting Program. At this time, the locations and number of wells remaining appear to <br /> be adequate for ground water monitoring. We concur with the proposed destruction of the four <br /> referenced monitoring wells at the Alden Park project site. Please notify the Central Valley Water Board <br /> staff at least 48 hours prior to initiating the field activities. <br /> By 15 May 2006,please submit your summary report, describing the well destruction activities. <br /> If you have any questions or comments,please contact Dean Hubbard at (559) 445-5179. <br /> SHELTON RcL 1 V C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> PG No. 6357 <br /> cc: Michael Infurna, Jr., San Joaquin County EHD, Stockton <br /> Luis Mercado, SAIC, Sacramento <br /> California Environmental Protection Agency <br /> ¢a Recycled Paper <br />