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r <br />i <br />Mr. Michael Walton <br />Walton Engineering <br />March 20, 1998 <br />Laboratory analytical results of the soil sample composites collected from the soil stockpile indicated <br />that elevated concentrations of TPI -Ig and BTEX compounds and/or TPI -Id were detected in all four <br />of the soil sample composites (Table 2). Total lead was detected at concentrations slightly greater <br />than the reporting limit of the laboratory method in all four soil sample composites (Table 2). <br />TABLE 2 <br />LABORATORY RESULTS OF SOIL SAMPLE ANALYSES <br />OVEREXCAVATION AND SOIL STOCKPILE <br />3300 WEST LANE, STOCKTON, CALIFORNIA <br />In <br />Overexcavation <br />S-19-E1n <1.0 <0.005 <0.005 <0.005 <0.010 <br />29 <br />na <br />S-17-E1w <1.0 <0.005 <0.005 <0.005 <0.010 <br /><1.0 <br />na <br />S-24-E1b 1.4 <0.005 <0.005 <0.005 0.011 <br />230 <br />na <br />Soil Stockpiles <br />SP 1 a -d 2.4 0.0087 0.290 0.130 0.950 <br />na <br />21 <br />SPle-h 1.3 <0.005 0.023 0.0096 0.140 <br />na <br />8.8 <br />SP2a-d 9.3 0.0071 0.110 0.120 0.930 <br />780 <br />11 <br />SP2e-h 65 <0.050 0.120 1.20 3.60 <br />14,000 <br />12 <br />Laboratory results of soil samples are reported in milligrams/kilogram (parts per million) <br />TPHg = Total Petroleum Hydrocarbons in the range of gasoline <br />TPHd = Total Petroleum Hydrocarbons in the range of diesel fuel <br />< = Less than the laboratory method reporting limit <br />na = not analyzed <br />117 klei .Xy [IM <br />In November of 1997, the Regional Water Quality Control Board issued a mandate requiring that <br />environmental samples collected from underground storage tank sites be analyzed for five prominent <br />gasoline oxygenates and that this analytical data would be a criteria necessary for site closure. The <br />representative from SJCEHD requested, therefore, that all of the soil samples collected from beneath <br />underground storage tanks and fuel dispenser islands at the site be analyzed for the five oxygenates. <br />These five compounds include di -isopropyl ether (dIPE), ethyl t -butyl ether (EtBE), methyl t -butyl <br />ether (MtBE), t -amyl methyl ether (tAME), and t -butyl alcohol (tBA). <br />A total of thirteen soil samples collected from the site were analyzed for the five oxygenates. Only <br />the soil samples collected from beneath the northern ends of the fuel dispensers contained elevated <br />concentrations of gasoline oxygenates. The soil sample collected from approximately 4 feet below <br />ground surface at sample location FD 1 contained 2.5 ppm tBA and 0.11 ppm MtBE; the soil sample <br />GRA YLAND ENVIRONMENTAL <br />Grayland 022-160.trr 6 <br />