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TABLE II GROUNDWATER SAMPLE ANALYSES (12-31-92 ) SAMPLE LOCATION/CONCENTRATION MW-6 MW-7 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13 EW-1 (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) B ND 0. 5 55 . 0 39 .0 0. 3 ND ND ND 1. 4 T ND 0. 5 15 . 0 10. 0 ND ND ND ND 0. 3 E 1.4 ND 30 . 0 44. 0 ND ND ND ND 2. 3 X 1.6 ND 15 .0 46. 0 ND ND ND ND 3 . 3 TPH-G 78 .0 50 .0 1580.0 1600. 0 ND ND ND ND 70 .0 NOTE: ND Represents none detected ' 3.0 GROUNDWATER FLOW DIRECTION Site groundwater elevations and flow direction were determined based on water level measurements taken from ' monitoring wells 6 , 7, 8, 9, 10, 11, 12 , 13 and EW-1, December 31, 1992 (Table 12) . Monitoring wells 1, 2 , 3 , 4 and 5 were dry, therefore, no measurements were obtainable. ' Based on these measurements, the groundwater flow direction was determined to be in a Southerly direction. A Kriging program was used to generate a groundwater gradient map, which has been included as Figure 3 . TABLE 12 GROUND WATER ELEVATION 14EASUREMENTS (12-31-92 ) Reference Point Depth To Groundwater Date Well# Elevations Water Elevation ' 12-31-92 MW-6 52.99' 58 . 59' -5.60 12-31-92 MW-7 53 .90' 59 . 94' -6.04 ' 12-31-92 MW-8 53 .68' 59 . 74' -6.06 12-31-92 MW-9 53 .54' 59 . 71' -6.17 12-31-92 MW-10 53 . 21° • 58 . 92' -5 .71 12-31-92 MW-11 52 .95' 59 . 34' -6 . 39 ' 12-31-92 MW-12 53 . 35' 60 . 22' -6 .87 12-31-92 MW-13 53 . 36' 60 . 37' -7 .01 12-31-92 EW-1 53 . 21' 59. 17' -5.96 4.0 QUALITY ASSURANCE/QUALITY CONTROL Monitoring wells 6 through 13 were purged and sampled using a new, sanitary, disposable bailer at all sampling points. Extraction well EW-1 was purged with a 4" electric submersible pump and sampled using a new, sanitary, disposable bailer. The depth to water was measured prior to sampling each Imonitoring well. Each well was then purged of a minimum of STE Project No. 4001 Page 7