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0 California Regional Water Quality Control Board <br /> Central Valley Region ° <br /> ' Robert Schneider,Chair <br /> Alan C.Lloyd,Ph.D. Arnold <br /> 5ecrelaryfor Fresno Branch Office Schwarzenegger <br /> ' Environmental 1685 E Strezl,Fresno,California 93706 Governor <br /> Protection (559)445-5116•Fax(559)445-5910 <br /> htip://www.walerboards.ca.gov/centmlvalley <br /> ' 6 March 2006 <br /> M. Scott Mansholt <br /> ' Chevron Environmental Management Company <br /> 6001 Bollinger Canyon Road <br /> Rm.K2066 <br /> ' San Ramon, CA 94583-2324 <br /> ADDENDUM-SOIL SAMPLING AND ANALYSIS WORKPLAN REVIEW, MOUNTAIN HOUSE <br /> ' SITE#6, MOUNTAIN HOUSE,SAN JOA QUIN COUNTY <br /> Regional Board staff previously reviewed the referenced workplan, dated 31 March 2005 and on 13 <br /> April 2005 approval was submitted to Chevron provided the groundwater sampling program included <br /> analysis and delineation for methyl tertiary butyl ether(MTBE). Subsequently, during a 16 February <br /> 2006 meeting with Chevron and Science Applications International Corporation(SAIC) staff, this topic <br /> was addressed it was decided that additional site characterization would not include this compound. <br /> ' The analysis for the constituents of concern in oil and groundwater at Chevron's Old Valley Pipeline <br /> sites—total petroleum hydrocarbons as diesel (TPHd),TPH as gasoline, (TPHg),benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX),polynuclear aromatic hydrocarbons (PAHs), should be completed as <br /> ' described in SAIC's 31 March 2005 workplan. <br /> We concur with SAIC's 31 March 2005 workplan for the Mountain House Site #6 as originally <br /> proposed. We understand that the access issues have been and/or will soon be resolved and that <br /> implementation of the Workplan can be initiated. Please notify Regional Board staff 48 hours prior to <br /> initiating field drilling activities. <br /> ' If you have any questions or comments, please contact Dean Hubbard at(559)445-5179. <br /> 1 'U" 46!�o <br /> r <br /> ' SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> PG No. 6357 <br /> ' cc: Mike Infurna, San Joaquin County Public Health Services, Stockton <br /> ✓Bella P. Bakrania, SAIC, Oakland <br /> ' Luis Mercado, SAIC, Sacramento <br /> California Environmental Protection Agency <br /> ' CI Recycled Paper <br />