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f. 0 <br /> Mr Jeffrey Wong <br /> Page 5 of 7 <br /> In boring SBI, FID readings ranged from 5 parts per million (ppm) at a depth of approximately 5 <br /> feet bgs to >10,000 ppm from approximately 15 feet bgs to 55 feet bgs At 60 feet bgs the <br /> concentration of volatile constituents decreased to 8,000 ppm and further decreased to 6,000 <br /> ppm at a depth of 65 feet bgs Strong odors were reported in samples from 15 feet to 65 feet No <br /> samples were recovered from 69 to 76 feet bgs because of heaving sands Due to the <br /> malfunctioning of the FID at 80 feet bgs in boring SB1, field screening of the soil was done by <br /> using physical parameters for the remainder of the investigation Moderate to strong odors were <br /> noted in boring SB2 from 25 to 30 feet bgs Slight to moderate product odors were recorded in <br /> each of the other borings <br /> Except for several occurrences of gray mottling in borings SBI and SB2, no abnormal <br /> discolorations were noted in the soil samples collected from the site <br /> 4.2 Laboratory Analysis <br /> Soil and groundwater samples were analyzed for benzene, toluene, ethylbenzene and xylenes <br /> (BTEX) and gasoline oxygenate additives using EPA methods 8020 and 8260, respectively TPHg <br /> was analyzed using EPA method 8015 modified <br /> 4.3 Soil Analytical Results <br /> wSamples collected from SBI at 20, 30, and 45 feet bgs contained significantly elevated levels of <br /> TPHg and BTEX In the sample collected at 80 feet bgs, TPHg was not detected and benzene was <br /> measured at a concentration of 0 005 parts per million (ppm) <br /> The sample collected at 30 feet bgs from SB2 had TPHg and benzene at concentrations of 810 ppm <br /> and 0 86 ppm, respectively <br /> No TPHg or BTEX was detected in borings S133 through SB5 Gasoline oxygenate additives were <br /> not detected in the soil samples from any boring Soil analytical results are summarized in Table 2 <br /> Laboratory reports and chain of custody documentation are included in Attachment C <br /> 4.4 Groundwater Analytical Results <br /> Groundwater analytical results from NMI indicated high concentrations of TPHg and BTEX <br /> Oxygenates were not detected Analytical results of groundwater samples are summarized in Table <br /> 3 Laboratory reports and chain of custody documentation are included in Attachment C <br /> 4.5 Data from 2701 N. Wilson Way (U-Haul) <br /> Groundwater monitoring wells were installed in 1991-1995 to investigate an underground storage <br /> tank release at 2701 N Wilson Way, located approximately 150 feet northwest of the subject <br /> property One well, MW7, is located on the southeast side of Wilson Way near the driveway of the <br /> former Harry's Auto Mart Hydrocarbon odors and elevated photoionization detector (PID) <br /> datalgrounzelharryslsumrpt doe <br />