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ti � • 07 May 2002 AGE-NC Project No. 98-0466 Page 2 of 16 concerns are discussed. Details of previous site assessments were resented in AGE's Site Contamination Work Plan,dated IISeptember 2001,and Preliminary ln estigationandEvaluation Report, dated 29 Janurary 2002. 3.1. WESTERN DITCH AREA The steam cleaning areas and the western ditch area have an interrelated environmental history;the steam cleaning areas discharged water to the western ditch area(Figure 3). The primary area(SCAT) was north of the former maintenance building, immediately west of the ater tower; the secondary area(SCA2) was north and west of the Finger joints building. A series of three sumps along a drain line connected the primary steam cleaning area to the western drainage di h;the drain line may have also received waste water from the SCA2 operation. Also, runoff may have drained from the secondary steam cleaning area directly to the western drainage ditch. 3.1.1. North Steam Cleaning Area- SCA2 According to Mr. Glen Gallup, formerly of AM&M, following cessation of operations at SCAT,the steam cleaning operation was temporarily continued in the SCA2 area. This area was located along the drain line and tbree-sump system that conveyed waste water from the SCAT area to the western ditch, which again may have been utilized to dispose of waste water generated by the operation in the SCA2 area; additionally,runoff from the operation may have migrated toward the western ditch. AGE collected soil samples in the SCA2 area in December 2000 to assess for hydrocarbons and selected metals-chromium,lead,nickel, copper and zinc(Figure 3). TRF H was not detected in two shallow soil samples (one foot below surface grade)located between the former steam cleaning area and the west ditch. Detected concentrations of chromium, lead and zinc were within levels considered to be background. As part of AGE's investigation of the SCA2 area, one soil boring was advanced adjacent to the western ditch area to first encountered ground water to collect soil and grab ground water samples. Two soil samples were analyzed, one from 10 feet below surface grade i bsg) and one from 15 feet bsg, to assess the vertical extent of contamination previously encountered in sample DS1-2 during the June 2000 assessment, as discussed below. Concentrations of detec ed TRPH were not above laboratory reporting limits for either sample. Metals concentrations (chrc mium, lead and zinc)were consistent with background levels. The collected ground water sample did not contain detectable concentrations of TRPH, but did contain 0.95 mg/1 chromium, 0.17 mg I lead, and 2.07 mg/1 zinc. The ground water sample had not been filtered and the detected metals are most likely soil components in the sample. Based on the results of the December 2000 assessment, contamination Advanced GeoEnvironmental,Inc.