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Californ0egional Water Quality C( . _ . A Board <br /> Central Valley Region °1 <br /> Karl E. Longley,ScD, PE,Chair + 4' <br /> Linda S.Adams Arnold <br /> Secreta,yfor Fresno Branch Office Schwarzenegger <br /> EnvirOlDnenial 1685 E Street,Fresno,California 93706 <br /> Protection (559)445-5116•Fax(559)445-5910 Governor <br /> http:/hvww.waterboards.ca.gov/centralvalley <br /> 5 June 2007 <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road 2(�D s, CaOfu . <br /> Room K2066 <br /> San Ramon, CA 94583-2324 <br /> ADDENDUM — REGIONAL WATER BOARD WORKPLAN APPROVAL, SOIL AND <br /> GROUNDWATER INVESTIGATION, TAOC TRACY GRAVEL PITS, TRACY, SAN JOAQUIN <br /> COUNTY <br /> This addendum clarifies the suite of laboratory analyses described in the Regional Water <br /> Board's approval of the 30 January 2007 workplan provided by Geomatrix Consultants, Inc. <br /> (Geomatrix). In the 14 February 2007 workplan acceptance letter it was specified that the nine <br /> proposed groundwater samples would be submitted for analysis of the site petroleum <br /> constituents of concern and water quality parameters. <br /> During a 31 May 2007 telephone conversation with Geomatrix representatives, it was <br /> discussed how two of the proposed boring locations for groundwater sampling are adjacent to <br /> sites where samples were previously analyzed for petroleum hydrocarbon compounds. <br /> Therefore, groundwater samples from these two sites (in the northeast and northwest property <br /> corners) should be analyzed only for the general water quality parameters as proposed. <br /> However, groundwater samples obtained from the third proposed onsite boring location, <br /> hydraulically upgradient and in the southwest corner of the property, should include analysis <br /> for the site petroleum hydrocarbon constituents of concern in addition to water quality <br /> parameters. <br /> If you have any questions regarding this matter, please call Dean Hubbard at (559) 445-5179. <br /> 1 <br /> ?Olrl ,�Y 3 7 <br /> C. DEAN HUBBARD Phl2: St <br /> Engineering Geologist <br /> P. G. No. 6357 as Ars. 0"' <br /> CDH:cdh <br /> cc., Michael Infurna, San Joaquin County EHD, Stockton <br /> Gary Foote, Geomatrix, Oakland <br /> California Environmental Protection Agency <br /> C3 Recycled Paper <br />