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California Regional Water Quality Control Board <br /> ` Central Valley Region '���-I1; <br /> Robert Schneider,Chair 04 MAY <br /> Terry Tamminen Fresno Branch Officel 3 Arnold Schwarzenegger <br /> Secrelary for Internet Address: http://www.swrcb.ca.gov!—rwgcb5 Governor <br /> Environmental 1685 E Street,Fresno,California 93706 <br /> Protection Phone(559)445-5116•FAX(559)445-5910 <br /> 20 May 2004 <br /> Mr. M. Scott Mansholt <br /> ChevronTexaco <br /> Chevron Environmental Management Company <br /> P.O. Box 6012 <br /> San Ramon, CA 94583 <br /> SITE INSPECTION AND GROUNDWATER SAMPLING RESULTS —MOUNTAIN HOUSE <br /> SITES # 1 AND # 2, SAN JOAQUIN COUNTY <br /> Regional Board staff recently inspected the Mountain House Sites # 1 and#2 to observe drilling activities <br /> and to collect groundwater samples for petroleum hydrocarbons and general minerals analysis. <br /> The inspection and sampling was conducted on 21 April 2004. Detailed comments and analytical results <br /> are provided in the attached memorandum and summarized below: <br /> * The soil and groundwater investigation is being conducted along the OVP and Byron Road <br /> easement where Mountain House Creek flows beneath the road and the adjacent UPRR tracks. <br /> • Petroleum hydrocarbons have impacted soil and groundwater beneath the site, including an area <br /> that is proposed for a streambed alteration and bridge replacement project associated with a <br /> residential development. <br /> a Elevated concentrations of TPH-d as high as 10,000 µg/L and TPH-g as high as 770 �tg/L were <br /> reported in two groundwater samples, respectively. BTEX and MTBE were not detected. The <br /> total dissolved solids results were 1,100 and 1,200 mg/L, which is consistent with similar <br /> sampling conducted for shallow groundwater in the Tracy area. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> SHELTON R. G Y C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> RG No. 6357 <br /> cc: Michael Infurna, Jr., San Joaquin County EHD, Stockton <br /> Jim Levy, UPRR, Sacramento <br /> Luis Mercado, SAIC, Sacramento <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />