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California&gional Water Quality Cone] Board <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> 1685 E Street,Fresno;California 93706 <br /> Matthew Rodriquez (559)445-5116•FAX(559)445-5910 Edmund Go Brown Jr. <br /> Secretaryfor http://wwwsyatrrrpp�c vnv/I@ntralvalley Governor <br /> Environmental Protection HH L{...((Vv`�E VED <br /> 16 August 2011 AUG 17 2011 <br /> ENVIRONMENTAL HEALTH <br /> Michael N. Oliphant PERMIT/SERVICES r4bl.-SAeokH Pw* <br /> Chevron Environmental Management Company 063 Lby <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583 <br /> REVIEW—WELL VAULT REPLACEMENT WORKPLAN, ALDEN PARK, TRACY, SAN <br /> JOAQUIN COUNTY <br /> Chevron Environmental Management Company (Chevron) submitted a Well Vault <br /> Replacement Workplan, Alden Park (Workplan) dated 1 August 2011, for the Alden Park <br /> project in central Tracy. The Workplan was prepared on behalf of Chevron by Science <br /> Applications International Corporation — Benham Companies, LLC (SAIC). <br /> Recent site inspections noted that certain monitoring well vault covers were damaged and in <br /> need of replacement. SAICs' Workplan proposes the following: <br /> • Remove and replace 10 well vaults in the park and four and in the sidewalk around the <br /> park with 12-inch diameter metal vaults/covers. <br /> • Repair and replace one well casing and vault damaged by previous excavation <br /> activities. The top of the new well casing will be resurveyed. <br /> • Repair details will be provided in the annual 2012 monitoring report. <br /> Central Valley Regional Water Quality Control Board staff concur with the Workplan. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179 or <br /> by email at dhubbard(a)waterboards ca aov. <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> cc: Michael J. Infurna, San Joaquin County DEH, Stockton <br /> Michael Hurd, SAIC, Oakland <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />