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ENVIRbNMENTAL SOLUTIO, IN t,n,-. . 1! �, r May 11, 1992 MAY 14 1992 ENVIRONMENTAL HEALTH PERMIT/',-: Project No. 90-822 Ms.Diane Hinson Supervising Environmental Health Specialist San Joaquin County Public Health Services P.O. Box 2009 1601 E. Hazelton Avenue Stockton, California 95201 MLQr-k:plan for Investigation and Closure of Remaining Fill Ling Stockton Railyard and Fueling Facility Santa Fe Railway CQ-m-J29nY Dear Ms. Hinson: Per our telephone conversation on April 29, 1992,we are submitting this workplan for the investigation and.closure of the remaining fill line for the former 10,000-gallon wastewater Wk at .the Santa Fe Railway Company railyard in Stockton. Figure 1 shows the approximate location of the remaining fill line. The fill line is located adjacent to the main track leading into the trailer on .flat car/container on flat car(TOFC/COFC)portion of the yard,and is also the scale track used in weighing the trains. As such, shutting down the track for the length of time needed to remove the fill line would significantly disrupt activities at the railyard. In addition, sampling below the fill line every 20 feet along the entire length of the line would be time consuming and may also disrupt site activities if a backhoe or drill rig were used to collect the soil samples. In light of the above concerns,we propose to evaluate the potential presence of leaks in the fill line, investigate the potential presence of petroleum hydrocarbons should leaks be found, and close the fill line in place. To accomplish the above tasks,the following activities would be completed: • Evaluate the potential vresence of leaks in the fill line by filling the line with pressurized gas containing either helium or other trace chemicals, and monitoring the length of the line for the presence of the gas. Leaks in the fill line would be identified by the presence of elevated levels of the trace chemical in the soils adjacent to or above the line. • Once the location(s)of potential leaks are identified, soil gas samples could be collected from each of the leaks to evaluate the potential presence of petroleum hydrocarbons in the soils adjacent to the former fill line and may help reduce the number of location(s)requiring sampling. • The former fill line would then be closed in place by pressure grouting with a cement grout. • Soil samples would be collected from the location(s)of potential leaks identified above. The horizontal and vertical.extent of petroleum hydrocarbons in the soils would be determined by collecting soil samples from the area adjacent to the potential leaks. The soil samples would be 2815 Mitchell Drive -Suite 103 -Walnut Creek, CA 94598 (510)935-3294-FAX (510)935-5412