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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Linda S.Adams Karl E. Longley,SCD, P.E., Chair Arnold <br /> Secretary for Schwarzenegger <br /> Environmental Fresno Office Governor <br /> Protection 1685 E Street,Fresno,California 93706 <br /> (559)445-5116•Fax(559)445-5914 <br /> http://WWW.WatCTboards,ca.gov/rcntralvalley <br /> FACT SHEET <br /> PROPOSED NO FURTHER ACTION REQUIRED, MOUNTAIN HOUSE SITE #1, <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 was discovered to soil and groundwater from the historical Old Valley <br /> Pipeline (OVP) and/or Tidewater Associated Oil Company pipelines. From the early 1900's to <br /> the late 1960's the pipelines transported unrefined crude oil from Kern County to San <br /> Francisco Bay area refineries. During the early 1940s the OVP was used to transport <br /> Bunker C fuel oil from the refineries to railroad locomotive fueling terminals near Tracy. <br /> The site is adjacent to the intersection of West Byron Road and the Mountain House Creek <br /> bridge crossing. The affected soil and groundwater occurs within the West Byron Road and <br /> Union Pacific Railroad easements, primarily beneath West Byron Road, the railroad tracks, the <br /> historical pipelines, and two existing active pipelines next to the tracks. Between 2001 and <br /> 2004 soil and groundwater samples were collected for certified laboratory analysis. Petroleum <br /> hydrocarbon/crude oil compounds were identified in soil and/or groundwater to an approximate <br /> depth of 48 feet. The area of affected soil is limited with approximate dimensions of 150 by <br /> 200 feet and the extent of impacted groundwater slightly larger than the area of affected soil. <br /> Fuel fingerprint analysis and evaluation confirmed the petroleum hydrocarbons present were <br /> consistent with degraded San Joaquin Valley crude oil. Residual concentrations will naturally <br /> 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 constructionitrench worker scenario for maintenance activities <br /> associated with West Byron Road and the other utility features within the easements. <br /> According to the ESE, the consultant's findings concluded that the residual crude oil remaining <br /> 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://geotracker.waterboards.ca.gov/search/casesearch.htm) and Regional Water <br /> Board case files. The Regional Water Board case number is SL0607789794. Interested <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 a-maii at <br /> dhubbard waterboards.ca. ov, or at (559) 445-5179 by 30 August 2008. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />