SITE INFORMATION AND CORRESPONDENCE

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134 South Sutter Page 2 PHS/EHD staff observed the uncovered tanks on October 4, 1988 and noted odors and stained soil around the top of the tanks. These former tanks were located approximately 20 feet east of Sutter Street and 250 feet south of Market Street. Concrete Waste Oil/Water Separator Sump On October 7, 1988, the City of Stockton uncovered another UST and requested a PHS/EHD inspector to be on site to witness soil sampling. The soil sample collected (#16964) at 8.5 feet below ground surface (bgs) indicated elevated levels of xylene (.34 ppm) and lead (43 ppm). This tank was located approximately 75 feet east of Sutter Street and 250 feet south of Market Street. The site was referred to the Central Valley Regional Water Quality Control Board (CVRWQCB) on January 20, 1989 based on documented soil contamination. The 1991/1992 State Water Resources Control Board contract which PHS/EHD entered into, authorized PHS/EHD to oversee the investigation and clean-up of all petroleum related contamination associated with UST. Tank #3 On October 31, 1988, one 500 gallon UST was removed and sampled under PHS/EHD inspection. The soil sample (#18149) was collected at 9 feet bgs and no contamination was detected; however slightly higher than normal detection limits were used. The tank was located approximately 75 feet east of Sutter Street and 5 feet south of Market Street. Tank #4 On February 10, 1989, a liquid sample of the contents of this 1,200 gallon tank was collected and analyzed. The contents were subsequently reported as 46 percent diesel by weight and the remainder primarily water but a copy of the analytical results were not provided. Please submit a copy of the analytical results of the tank's contents. On February 23, 1989, the tank was removed and two soil samples (#31034 and #31035) were collected at 8.5 feet bgs. Odor and discoloration of the soil was noted by PHS/EHD staff in both areas sampled. The laboratory analysis detected soil contamination in sample, 31035, of 110 ppm hydrocarbons in the range of C13 to C28. The lab quantitated the sample results based upon a diesel standard. The detection Iimits for TPH were elevated, 25 ppm instead of 1 ppm; also the detection limits for BTEX were highly elevated, 50 ppm for BTE and 100 ppm for X. The tank was located approximately 125 feet east of Sutter Street and 5 feet south of Market Street. On March 10, 1989, the area where sample 31035 was collected, was excavated to approximately 14 feet bgs and 20 cubic yards of contaminated soil removed. Two soil samples [#22926 (bottom sample at 14 feet bgs) and #22927 (north sidewall at 13.5 feet bgs)] were collected from the excavation. PHS/EHD staff observed definite hydrocarbon odors and soil discoloration which was not sampled. Those present at the time of sampling were informed that the contamination would be documented and that re- sampling could be necessary. I I