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California Regional Water Quality Control (Board Central Valley Region Karl E. Longley, SCD, P.E., Chair Linda S. Adams 11020 Secreta for 11020 Sun Center Drive#200, Rancho Cordova: California 95670-6114 Schwarzenegger Phone(916)464-3291 •FAX(916)464-4645 Governor environmental http://www.waterboards.ca.gov/centraIva[ley Protection i k TO: Duncan Austin FRonn: Gerald Djuth Chief Asso. Eng. Geologist Private Sites Cleanup Unit Private Sites Cleanup Unit DATE: 6 November 2009 SIGNATURE: - - SUB iECT: SIT E I�vSFECTION, ANDRADE TRUCKING DIFSEL SPILL, STOCKTON, SAN JOAQUIN COUNTY On 9 October 2009 1 conducted a site inspection of a diesel fuel spill, accompanied by Greg Stahl of Ground Zero Analysis, the consultant on the project. The spill occurred 23 January 2007 on McKinley Avenue south of Industrial Drive in south Stockton, San Joaquin County. The spill resulted when a diesel truck, pulling a flatbed trailer, attempted to drive around railroad traffic control gates on McKinley Avenue and was subsequently hit by a Union Pacific Railroad (UPRR) locomotive. The diesel truck rolled onto its side and spilled its fuel tank, estimated at between 30 and 50 gallons of diesel fuel, on the side of the tracks on UPRR right-of-way. The Andrade Trucking driver was subsequently cited for attempting to circumnavigate the traffic control gate. Emergency responders at the time of the accidents used absorbent materials to absorb as much of the spilled fuel as possible. An unknown amount probably soaked into the soil. Andrade reportedly arranged for Ramage Environmental to respond to the spill and cleanup the soil contamination, but no work was done over a payment dispute. San Joaquin County Environmental Health tried unsuccessfully to get either Andrade or UPRR to clean up the soil, and referred the case to the Regional Water Board on 7 July 2008. The exact location of the spill was deduced from photographs taken at the time of the accident. The location is underlain by multiple utilities, including a petroleum pipeline, three fiber optic cables, a sewer line and electrical lines. In the approximately 33 months since the accident, UPRR has deposited and removed ballast and possibly soil from the area of the spill. At the time of the inspection, only a couple of inches of ballast covered the subgrade, which is highly compacted ballast and silty clayey soil. Slight discoloration of the soil was observed at the spill location, however similar discoloration was observed at other areas adjacent to the railroad tracks. Currently, the spill location is in a slight depression, therefore considerable precipitation would have to occur to result in overland flow. Overland flow would make its way to a drainage swale about 100 yards away. California Environmental Protection Agency 7'Recycled Paper