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r�NCalifornia Regional Water Quality Control Board`111�; ... `1 <br /> Central Valley Region <br /> Linda S.Adams Kari E. Longley,SCD, P.E.,Chair Arnold <br /> Secrelaryfor Schwarzenegger <br /> Environmental Fresno Office Governor <br /> Prolecrion 1685 E Street,Fresno,California 93706 <br /> (559)445-5116•Fax(559)445-5910 <br /> h ttp:llvvww,waterboards,ca,govkentral valley <br /> FACT SHEET <br /> PROPOSED NO FURTHER ACTION REQUIRED, MOUNTAIN HOUSE SITE #2, <br /> HISTORICAL CRUDE OIL PIPELINES, WEST BYRON ROAD, SAN JOAQUIN COUNTY <br /> This Fact Sheet is to inform interested parties of the California Regional Water Quality Control <br /> Board's (Regional Water Board) consideration of No Further Action Required for the subject <br /> property and to request any comments on the proposed action. During 2001, a release of <br /> non-hazardous crude oil to soil and groundwater was discovered from the historical Old Valley <br /> Pipeline (OVP) and/or Tidewater Associated Oil Company pipelines. From the early 1900s to <br /> the late 1960s the pipelines transported crude oil from Kern County to San Francisco Bay area <br /> refineries. During the early 1940s the OVP was used to transport Bunker C fuel oil from the <br /> refineries to railroad locomotive fueling terminals near Tracy. <br /> The site is approximately 100 feet northwest of the intersection of West Byron Road and the <br /> Mountain House Creek bridge crossing. The affected soil and groundwater occurs beneath <br /> the West Byron Road right-of-way easement and the historical OVP which lies within the <br /> easement. Between 2001 and 2004, soil and groundwater samples were collected for certified <br /> laboratory analysis. Petroleum hydrocarbon/crude oil compounds were identified in soil and/or <br /> groundwater samples to an approximate depth of 36 feet. The area of affected soil is limited <br /> with approximate dimensions of 75 by 100 feet and the extent of impacted groundwater is <br /> slightly larger than the area of affected soil, Fuel fingerprint analysis and evaluation confirmed <br /> the petroleum hydrocarbons present were consistent with degraded San Joaquin Valley crude <br /> oil. Residual concentrations will naturally degrade with time. <br /> In 2007, the consultant for Chevron Environmental Management Company conducted an <br /> environmental screening evaluation (ESE) based on the anticipated future site use. The ESE <br /> was completed based on a construction/trench worker scenario for maintenance activities <br /> associated with West Byron Road. According to the ESE, the consultant's findings concluded <br /> that the residual crude oil remaining at the site is not anticipated to pose a public health risk. <br /> Details of the site assessments are available to interested parties through the GeoTracker <br /> website (https://ceotracker.waterboards.ca.gov/search/casesearch.htm) and Regional Water <br /> Board case files. The Regional Water Board case number is SL0607789763. lnterested <br /> parties with questions or comments regarding the site or the proposed closure can provide <br /> written comments, or contact Dean Hubbard at the above address, by e-mail at <br /> dhubbardgwaterboards.ca.gov, or at (559) 445-5179 by 30 August 2008. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />