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ENVIRCKMENTAL SOLUTION-,4, INC. May 19, 1993 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 HUAI' ff aft Results f SQil SamplingMAY 2 5 1993 Beneath Remaining . Wastewater Lino Stockton Railyard €NVIRONMENT4 HEALTH Santa Fe Railway Company PERMIT/SERVICES Stockton. California Dear Ms. Hinson: This letter describes the field activities and results of the soil sampling beneath the remaining wastewater line at The Santa Fe Railway Company's(Santa Fe) Stockton Railyard located at the end of Diamond Street in the City of Stockton,California. The wastewater line connected track pans and an inspection pit at the former fueling facility with a 10,000-gallon underground wastewater storage tank. The fueling facility and three underground storage tanks,including the track pans and 10,000-gallon wastewater tank,were removed from the facility during October and November 1990. Results of activities related to the removal of the underground storage tanks are presented in the Tank Closure Report, Removal of Three Underground Storage Tanks, Stockton Railyard and Fueling Facility,dated December 1990. The wastewater line was pressure-tested for possible reuse following the removal of the underground tanks and associated contaminated soils in 1990. The line passed the integrity testing at 2 psi pressure, but failed at the higher 5 psi pressure. The wastewater line was left in place pending installation of an oil/water separator system in the same area. However,future site plans have changed, and the oil/water separator will no longer be installed in this area. To complete the removal activities for the former fueling facility,the soils beneath the wastewater line required sampling. The wastewater line would then require abandonment or removal based on the results of the testing. A proposal for the integrity testing of the wastewater line using a tracer gas method,then sampling the soils below where leaks in the pipe were identified,was submitted to San Joaquin County Public Health Services on May 11, 1992. However,concerns regarding the effectiveness of this method resulted in our modifying the proposed procedure. As discussed during our telephone conversation on April 5, 1993, the integrity of the wastewater line would be evaluated by collecting soil samples from approximately two feet below the bottom of the line at approximately 20 foot intervals along the length of the pipe per San Joaquin County requirements. A total of 18 soil samples were collected from below the wastewater line during the period of April 7-9, 1993. Figure 1 shows a partial plan of the site and approximate locations of the soil samples. Boring BH-1 was located approximately 28 feet north of the former 10,000 gallon wastewater tank to clear the railroad tracks and to provide a sample next to the 90°bend in the wastewater line. Boring BH-2 was located approximately 12 feet east of boring BH-1, a total of 2815 Mitchell Drive-Suite 103 -Walnut Creek, CA 94598 (510)935-3294-FAX(510)935-5412 U`{