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California Regional Water Quality Control Board '' <br /> QW; Central Valley Region 1 <br /> ��� j° <br /> Robert Schneider,Chair <br /> Alan C.Lloyd,Ph.D. Arnold <br /> Secretary for Fresno Branch Office ����MAR <br /> p All <br /> �� +O <br /> Environmental 1685 E Street,Fresno,California 93706 ft11 1 All 10: 59 Governor <br /> Protection (559)445-5116• Fax(559)445-5910 - <br /> http://www.waterboards.ca,gov/centralvalley Ty <br /> HEALENY[R()f3HENTAiL <br /> HEALi�fD P<�TriE!`dT <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,MO UNTAIN HO USE, SAN JOA QUIN CO UNTY <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 46 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 /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> PG No. 6357 <br /> cc: AMike 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 /> 0a Recycled Paper <br />