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California --gional Water Quality Cc .•ol Board ; <br /> Central Valley Region <br /> Karl E. Longley, ScD, PE, Chair <br /> s t <br /> Linda S. Adams Arnold <br /> Secrelarrfor Fresno Branch Office Schwarzenegger <br /> Envn•onnenrn/ 1685 E Street, Fresno, California 93706 Governor <br /> Pwlecnon (559)445-5116 • Fax(559)445-5910 <br /> http://www.waterboards.ca.gov/centraIvaIley �� - <br /> Ir <br /> L� �LrJI VV ED http://www.waterboards.ca.gov/centraIvaIley -M <br /> July 2008 JUL 2 j 2008 <br /> ENVIRONAAEN i HEALTH <br /> PERMIT/SERVICES <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road <br /> BR1Y3432 <br /> San Ramon, CA 04583 <br /> REVIEW - SOIL AND GROUNDWATER INVESTIGATION REPORT, FORMER TRACY <br /> PUMP STATION, TRACY, SAN JOAQUIN COUNTY <br /> Regional Water Board staff has reviewed the referenced report, dated 10 June 2008, prepared <br /> for Chevron Environmental Management Company (Chevron) by Science Applications <br /> International Corporation (SAIC). Additionally, we reviewed previous soil and groundwater <br /> investigation reports conducted for Chevron by SAIC and others from 2002 to 2007. Detailed <br /> comments are provided in the attached memorandum and summarized below. <br /> SAIC's report summarized and concluded the following: <br /> • The vertical extent of affected soil has been defined onsite by non-detect analytical <br /> results at a depth of 31.5 feet. Additional soil characterization is not needed. <br /> • Additional characterization is needed onsite to delineate the extent of affected <br /> groundwater. <br /> • Affected soil and groundwater has been delineated upgradient and crossgradient. <br /> Groundwater has also been delineated to the north of the property. <br /> • Additional characterization is needed to define the lateral extent of affected soil and <br /> groundwater offs ite-downgrad ient, northeast of the property. <br /> • An onsite water well has not been affected by petroleum hydrocarbons. <br /> • Sampling for TPH as gasoline (TPHg), previously reported present in groundwater, <br /> needs to be included. A sample(s) needs to be submitted for fuel fingerprint evaluation. <br /> California Environmental Protection Agency <br /> Cc,Recycled Paper <br />