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` 7 Imo+ GEOLOGY Stauffer Stauffer Chemical Company DEPARTMENT 1391 South 49th Street Cahtornba 44804 r Tel, 415)231.1244 Aorll 28. 1987 Ms. Laurie Cotutle. R.S. i - -JAY " r.ti y y San Joaquin Local Health District P. 0. Box 2009 Stockton! California Dear Ms. Cotul las EUVii;C'•,ttXTAL HEALTH FERIABIBERV#CES Attached is a copy of the laboratory report "Analysis of Soil Samples Collected 3/30/87 at Stockton Ragu plant". The reportCresents the data from the chemical analysis of soil samples collected from 3 soil borings taken at Ragu Foods' Stockton. California facility. The soil borings were made as a part of a subsurface investigation of potential leakage from underground storage tanks. The tanks were removed in May 1986. t Analysis of soil samples collected at the time of tank removal Indicated the presence of diesel, chlorinated benzenes. and other benzene, related compounds. The results of the sampling program of 3/30/87 Indicate that high levels of diesel and low levels of benzene. toluene. xylene, and ethylbemene remain under the tank site. With the exception of one sample, soils adjacent to the site were found to be free of hydrocarbon residue. No chlorinated benezenes were detected in any of the soil samples. The sampling program performed on 3/30/87 consisted of the collection of soil samples from 3 Uorings penetrating to a depth of 30 feet. One boring was mode t directly under the tank site and 2 borings were made 10 feet distant. The locations of the borings and the tank site is shown in Figure l of the attached report. In the boring made directiy under the tank site. samples were collected every 2.5 ft. starting at a depth of 15 feet. The area had been excavated to a depth of 14 feet during the previous work. Diesel was found in the soil at concentrations of 140000 to 61000 ug/g (mircograms per gram). See Table I of the attacned report. With the exception of one sample. no diesel residue was found in the other 2 borings, The one exception was the detection of 20-30 uq/4 diesel at the 10-foot level in boring R-3. Minor amounts of aromatic volatile organics were found under the former tank site. Compounds detected included benzene (I ug/g), toluene (0.5 to 3.7 ug/g). xylene (0.4 to 22 ug/g) and ethylbenzene (0.7 to 4.4 ug/g). None of these aromatic compounds were detected in the 2 soil borings adjacent to the site. No chlorobenzene or dichlorobenzenes were detected in soil samples at a detection limit of 0.1 ug/g. The quality assurance procedures that were incorporated into the current analytical program show that had chlorinated benzenes been present. they would have been detected. It is felt that the reported detection of chlorinated benzene In the previous worts was the resralt of the rniss-identification of analytes.