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CHRONOLOGY <br /> 5154 HOGAN LANE, LODI <br /> 05/08/86 A 350 gallon diesel UST and a 550 gallon gasoline UST were <br /> removed. The soil sample results for BTEX were non detect but <br /> the detection limits were 1 ppm. Lead was evidenced at 23 ppm. <br /> The UST excavations were filled. <br /> 11/24/92 The UST areas were again excavated and the soil was sampled. <br /> There was no odor or discoloration noted to the soil in the area of <br /> the former diesel UST and the results of the soil sample were non <br /> detect at .005 ppm for BTEX , 2.5 ppm for TPH-gas and 5 ppm for <br /> TPH-diesel. The former gasoline UST area was noted to have <br /> odor and discoloration to the soil and the soil sample results <br /> evidenced contamination. Lead analysis was non detect at 5 ppm. <br /> The soil was placed back in the excavations. <br /> 09/21/95 The gasoline UST area had 40 cubic yards of soil excavated from <br /> it. The excavation was 10'X10' and 11 feet deep. Soil samples <br /> were collected from the 4 sidewalls and the bottom of the <br /> excavation. All samples evidenced contamination. 22 cubic yards <br /> of soil that appeared contaminated was left in a stockpile. The <br /> remaining 18 cubic yards appeared clean and was used to fill the <br /> excavation with other clean material. The stockpiled soil was <br /> sampled and the results indicated low levels of contamination. <br /> 12/13-14/95 4 soil probes were advanced to 40 feet below surface grade. P1 <br /> was in the former gasoline UST location. Soil samples from this <br /> probe evidenced very low levels of contamination. P2, P3 and P4 <br /> were east of the UST area and within 20 feet of the area. All the <br /> soil samples were non detect. <br /> 05/07/98 One soil probe was advanced 10 feet west of the gasoline UST <br /> area to 40 feet below surface grade. The soil results were non <br /> detect. A water sample was collected from the domestic well and <br /> the results were non detect. Depth to groundwater is about 60 feet <br /> below grade. <br /> 06/19/98 PHS/EHD received a Site Assessment Report in which the <br /> consultant recommended site closure. <br /> 11/24/98 PHS/EHD concurs with site closure recommendation. <br />