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1 29 January 2002 r AGE-NC Project No. 98-0466 Page 5 of 25 r04 May 2001. The unattached map (Figure 5-1), apparently copied from a report, was among materials reviewed for this report. r 2.2. STEAM CLEANING AND WESTERN DITCH AREAS rThe two steam cleaning areas and the western ditch have an interrelated vironmental history.Both 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)vater tower, the secondary r area(SCA2)was north and west of the Finger joints building. A series o three sumps along a drain line connected the primary steam cleaning area to the western drainage di ch;the drain line may have r also received waste water from the SCA2 operation. Also, runoff mzLy have drained from the secondary steam cleaning area directly to the western drainage ditch. r2.2.1. South Steam Cleaning Area- SCAI Kleinfelder (1992) reported that SCAT was assessed through a soil s ling program and that elevated hydrocarbon concentrations were not detected by the assess nt. The 1992 Kleinfelder report did not contain details of the investigation. AGE does not have a copy of the primary report rof the investigation. AGE collected soil samples in the SCAT area in December 2000 to assess for hydrocarbons and selected metals. Four shallow soil samples (0.5 to 2 et bsg) contained TRPH r concentrations ranging from 40 mg/kg to 360 mg/kg, which appeaj to be slightly elevated. Concentrations of chromium in the four samples were within background levels. One sample, HA3-6", contained concentrations of lead and zinc that exceed Califo is background levels at r 235 mg/kg and 262 mg/kg, respectively. Lead and zinc in the other three samples were within background levels common for California soils (Kearney Foundation, 996). Figure 3 shows the AGE sampling localities in the area: Table 7 shows the analytical data cbtained by AGE from the r soil samples. The TRPH concentrations were characterized by the labor ory as being in the motor oil hydrocarbon range;the elevated lead and zinc concentrations may be due to runoff fromthe steam cleaning area and appear to have a limited areal extent. r 2.2.2. North Steam Cleaning Area- SCA2 rAccording to Mr. Glen Gallup of AM&M, following cessation of oper ions at SCAT, the steam cleaning operation was temporarily continued in the SCA2 area. This aj ea was located along the rdrain line and three-sump system that conveyed waste water from the 1,CAl area to the western • ditch, which again may have been utilized to dispose of waste water gen-rated by the operation in the SCA2 area; additionally,runoff from the operation may have migrated toward the western ditch. r Advanced CceEnvlranmentA Inc. r