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SECTIOMTW® 9110 lackgrounC groundwater samples due to the recent construction of the maintenance building, these wells were located in the footprint of the building Groundwater concentrations of TPH g, TPH-d, BTEX and MTBE were not above the laboratory detection limits in groundwater monitoring wells MW-16 and MW-25 during 1998 TPH-d were detected in the following rime monitoring wells MW-9, MW-11, MW-13, NM-14, MVI-24, VW-1, VM-1, VM-2, and MW-26 TPH-g were detected in the following seven monitoring wells MW-12, MW-13, MW-14, MW-20, VW-1, VM-1, and VM-2 BTEX were detected in seven MW-12, MW-13, MW-14, MW-19,VW-1, VM 2, and MW-26 MTBE was detected in one well,VW-1, using EPA Method 8020 In summary, 21 groundwater monitoring wells have been installed at the Shop 10 site over the last 12 years Ten of the groundwater monitoring wells are currently located on site and are umcluded in the current groundwater monitoring program Eleven of the groundwater monitoring wells have been abandoned A total of 153 groundwater samples have been collected and analyzed (through the August 1998 groundwater sampling event) for TPH-g and BTEX A total of 127 groundwater samples have been analyzed for TPH-d and a total of 110 groundwater samples have been analyzed for MTBE At the Shop 10 site, a total of 241 soil samples were collected and analyzed for TPH-g and BTEX, and a total of 76 soil samples were analyzed for TPH-d Results of soil and groundwater analytical results are summarized in Table 2-1 and 2-2, respectively The frequency of concentrations of TPI-g, TPH d, BTEX, and MTBE detected above laboratory reporting limits in groundwater are shown in Table 2-3 MTBE has been analyzed for by EPA Method 8020 for 110 groundwater samples and was detected above the laboratory reporting lints in 18 groundwater samples Twelve of the same groundwater samples were analyzed for MTBE using the gas chromatograph/mass spectrometry method EPA Method 8260 and was not detected above laboratory detection limits ' The frequency of concentrations of TPH-g, TPH d, and BTEX detected above laboratory reporting limits in soil are shown in Table 2-4 TPH-g were detected in 18 percent of the soil samples analyzed Benzene was detected in 27% of the soil samples analyzed MTBE was analyzed for in soil samples collected from soil borings VM-1,VM-2, MW-25, and MW-26 in 1996 and was not detected above the laboratory detection limit of 0 0005 mg/kg in all soil samples tested r � ® T%1987W79009NA%STOCKTOMREPORTLSHOREM DOG18-FE8-Wa73008NA%%A 2-7