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1 11 SEMCESB�I� ��AI�PU =. s <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer ��cr,�oa��i• <br /> 445 N. San Joaquin Street * P. O. Box 388 • Stockton, CA 95201-0388 <br /> 209/468-3420 <br /> FRANK YONESHIGE C (OPY <br /> VAN DEN BERGH FOODS INC <br /> P O BOX 9200 JAN 10 199 5D <br /> STOCKTON CA 95208 <br /> RE: Ragu Foods SITE CODE: 22073 <br /> 1400 Waterloo Road <br /> Stockton CA 95205 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has <br /> completed review of the "Interim Corrective Action Plan" dated November 1994 and <br /> prepared by IT Corporation. PHS/EHD has the following comments for your consideration. <br /> The Plan proposed to re-excavate up to 200 cubic yards of contaminated soil after the <br /> removal o€14 feet of soil used to backfill the tank pit in 1986. The Plan indicated that once <br /> the backM was removed,five soil samples would be collected from the bottom and sidewalls <br /> and analyzed on site by a mobile laboratory. The Plan further indicated that based on <br /> analytical, visual, olfactory and field screening with a photoionization detector (PID) the <br /> excavation would continue to a depth of 20 feet below grade. The Plan proposed that a <br /> maximum of five additional soil samples would be collected to assess the effectiveness of the <br /> excavation to remove soil contamination which presents a threat to groundwater quality. <br /> The Plan suggested that if field conditions warranted additional excavation would be <br /> recommended. <br /> PHS/EHD has evaluated historical soil data and evidence exists to suggest that soil above <br /> 14 feet is contaminated, soil boring B1 at 10 feet detected contamination of 23,000 ppm <br /> TPH-diesel and 1,400 ppm TPH-gas. In order to verify that the soil removed during the <br /> excavation is "clean", confirmation sampling will be required in addition to the <br /> characterization sampling of the contaminated stockpile for disposal requirements. Also, <br /> please note that the major contaminant, TPH-diesel, is considered a semi-volatile and PMs <br /> have limited capabilities to detect its presence. <br /> Based on historical soil data, additional excavation would further induce the residual stml <br /> contamination which poses a threat to groundwater. Significant soilcontamination was also <br /> evidenced in soil boring B1 below 20 feet: at 30 feet of 19,000 ppm TPH-diesel, at 40 feet <br /> of 6,400 ppm TPH-diesel, and at 50 feet 3,700 ppm TPH-diesel. Soil contamination was <br /> evidenced in the soil boring which was converted into monitoring well, MW4, at depths <br /> greater than 50 feet. <br /> A Division of San Joaquin County Health Care Services <br /> Site Mitigation Unit Supervisor <br /> MMI1400WATE <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Linus Farias, FT Corporation <br />