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• Mr. Harlin Knoll San Joaquin County Public Health Services, Environmental Health Division Page 2 May 18, 1995 0.285 ppm, 0. 610 ppm, 0 . 064 ppm, 0 . 540 ppm, respectively in soil samples collected from the floor of the excavation at a depth of approximately 21 feet. TPHg, EDB, and organic lead were not detected. The excavated soil was aerated, sampled, confirmed clean and returned to the excavation pit. In October 1990, four soil borings (B-1 through B-4) were drilled at the site, and one soil boring (B-5) was drilled on the adjacent property owned by Hammertown Partners (Hammertown) . The soil borings were drilled to a depth of approximately 40 feet bgs. Benzene and ethyl benzene were detected at concentrations of 0 . 024 ppm and 0. 0062 ppm, respectively in boring B-1 at a depth of approximately 25 feet. BTEX were detected at concentrations of 0.405 ppm, 1. 33 ppm, 0 .440 ppm, and 2 . 38 ppm, respectively in boring B-2 at a depth of approximately 30 feet. BTEX were not detected an soil samples collected from the other sample intervals from borings B-1 and B--2. TPHg was not analyzed in soil samples collected from borings B-1 and B--2 . TPHg and BTEX were not detected in soil borings B-3 and B-4 . Benzene, toluene, and ethylbenzene were detected at concentrations of 0 . 068 ppm, 0 . 037 ppm, and 0. 011 ppm, respectively in soil samples collected from offsite boring B-5 at a depth of approximately 25 feet bgs. Xylene and TPHg were not detected. TPHg and BTEX were not detected in soil samples collected from the other sample intervals in boring B- 5. In April 1992 , three additional soil borings (NBH #1 through NBH #3) were drilled at the site and three additional soil borings (HBH #1 through HBH #3) were drilled on the Hammertown site. The borings were drilled to approximately 36 . 5 feet bgs. Soil samples collected from the borings were analyzed for BTEX. BTEX were not detected in borings NBH #1 through NBH #3 , HBH #1 or HBH #3 . Benzene was detected at a maximum concentration of 0 . 028 ppm at depths ranging from 26. 5 to 31. 5 feet bgs in soil samples collected from boring HBH #2 , located on the adjacent Hammertown property approximately 20 feet south of the former UST excavation. Toluene, ethylbenzene, and xylenes were detected at concentrations of 0 . 017 ppm, 0. 008 ppm, and 0 . 019 ppm, respectively in soil samples collected from boring HBH #2 . The limits of soil contamination were defined by these soil borings, except in a southerly direction on the Hammertown property.