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i GEOLOGY .illi Stauffer Chemical Company DEPARTMENT 1:i91 South 491h SlrC011 1 Hichmond,Cahfolnia 94804 I Tei.(415)231-1244 April 2B. 1987 Ms. Laurie Gotulla, R.5. i, } San Joaquin Local Health District J p. 0. Box 2009 Stockton, California rir'1+iEtG'•'t-�TAt klEIil..Tk't Dear Ms. Cotulla: 9:FrjPdi7/,5ER`lICES Attached is a copy of the laboratory report "Analys':s Of 50il Samples Collected FM 3/30/B7 at Stockton Ragu Plant". The report presents 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 aepart f aTsubsurface tanks investire gatied on Of potential e6 leakage from underground storage tank removal lin Mated the Analysis of soil samples collected at. the tine of presence of diesel , chlorinated benzenes,3/30/87and other b ezthat ene rhigh edievem of dy The results of the sampling Program diesel and low levels of benzene, toluene, xylene,soitlseadjabcenteto theasiterder the tank site. With the exception of one sample, 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 borings penetrating to a depth of 30 feet. One boring was made directly under the tank site and 2 borings were made l0 feet distant. The locations of the borings and the tank site is shown in Figure 1 of the attached report. In the boring made directly under the tank site, samPles were collected every 2.5 Ft. starting at a depth of 35 feet. The area had been excavated to a depth ous work. Diesel was found in the soil at of 14 feet during the previOf concentrations of 140000 to hle0epc�� go�m'ofconeasample,ms per gram). me nodieselresiidueablelwas the attached report. With t found in the other 2 borings. The one exception was the detection of 20-30 ug/B diesel at the l0-foot level in boring R-3. ank Minor amounts of aromatic volatile organics were foundounderluene heSfto�3i.7tug/g)+ site. Compounds detected included benzene (1 to 4.4 ug/g). None of these xylene (0.4 to 22 ug/g) and ethylbenzene (0.7 to 4. aromatic compounds were detected in the 2 soil borings adjacent to the site. re in soil t a No chlorobenzene or dichlorobenhenqualees ty assurancisamples a epro eduresthatwere -- — ----.. - ---------detection im_it Of 0-1 ug/9• --- - incorporated into the current analytical--program-show-that--had.-ch.lorinate_._.______ benzenes been Present. they would have been detected. It is felt that the reported detection of chlorinated benzene In the previous work was the result of the miss-identification of analytes.