SITE INFORMATION AND CORRESPONDENCE

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PUBLTC HEALTH SERVICES �o .G SAN JOAQUIN COUNTY JOGI KHANNA M.D.,M.P.H. Health Officer P.O. Box 2009 (1601 East Hazelton Avenue) • Stockton,California 95201 (209) 468-3400 JAN 2 5 1991 D Carmelita Cozad ly Cozad Trailers 4907 Waterloo Road Stockton, CA 95205 RE: Cozad Trailers IN REPLY REFER TO SITE CODE: 2379 4907 E. Waterloo Stockton, CA 95205 We have completed our review of the "Initial Soil Investigation, " dated November, 1990, submitted by Gemini Petrographic Investigations. Our records show that when the 1000 gallon gasoline tank was removed from your site the tank and piping were in poor condition and there was odor evidenced in the soil. The detection limits used by the laboratory on these soil samples were not sensitive enough (1000 parts per billion (ppb) ) . Even with these detection limits xylene was detected at 5600 ppb and total petroleum hydrocarbons as gasoline (TPH-G) were detected at 200, 000 ppb in the soil samples. The resampling of the soil in the excavation in May, 1989 again detected TPH-G at 124 parts per million (ppm) (124 , 000 ppb) . The diesel tanks removed in June, 1989, were in good condition but discoloration of the soil was noted. The detection limits used by the laboratory on the soil samples from this activity again were not as sensitive as those listed in the LUFT manual. The re-excavation of the former gasoline tank location in January, 1990, confirmed TPH-G at 14 ppm in a sidewall soil sample and total petroleum hydrocarbons as diesel (TPH-D) at 39 ppm. The soil sample from the bottom of this excavation confirmed TPH-D at 11 ppm. The detection limits used by the laboratory for benzene, toluene, xylene, and ethyl benzene were again not as sensitive as those listed in the LUFT manual so a good assessment of the contamination in the soil at this site cannot be made. A Division of San Joaquin County Health Care Services 0