ARCHIVED REPORTS_PHASE II ENVIRONMENTAL SITE ASSESSMENT

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WIGIK • Southwest, Inc. Motor blocks from vehicles as large as diesel trucks are accepted by the facility. They are required to have filters removed and a hole cut in the oil pan with oil drained out. However, even when prepared in this manner, a certain amount of residual oil and grease remains on the motor blocks. These motor blocks are piled in uncovered stockpiles. Exposure to outdoor elements (heat, precipitation) could cause the residue to drip onto the underlying soil and potentially migrate downward in the subsurface. The known and potential petroleum releases on site were identified as RECs. Borings B-3 and B-4 were located in areas that were shown as former locations of motor block stockpiles on Learner stormwater plans. Boring B-8 targeted the container storage area, B-9 targeted the AST area and B-10 targeted the equipment wash area, all areas with surficial staining. Borings B-17 and B-18 were located in areas where old vehicles were observed to be stored during the Phase I. 5.4.6 Equipment Wash Area and Disposal of Wash Water The concrete wash pad area was observed to be heavily stained and coated with oil, grease and dirt, although it had recently been swept at the time of the Phase I. At that time the collection trough contained a significant amount of a dark oily liquid and a thick coating of sludge. The sump contained a greenish-colored oily liquid. The waste water generated in this area is pumped from the sump into a large tank where the oil and water are allowed to separate. The oil is skimmed off and the water passes through two 55- gallon drums of activated charcoal. The treated water goes into a holding tank and is subsequently pumped into a tank trailer and sprayed over the site surface for dust control. During the Phase I site visit, the tank trailer, which was parked adjacent to the wash area, was noted to have a significant leak. Water was spraying from it and had formed a large puddle on the surrounding ground surface. Boring B-12 was located in the area where this puddle had been observed during the Phase I. During the Phase H ESA the tank trailer was no longer parked in this location and the soil surface was dry. The untreated waste water has been analyzed only once, in 2001, and the treated water has never been analyzed. The efficacy of the waste water treatment system has never been evaluated. The untreated wastewater is likely contaminated with oil and grease as well as a range of substances, including transmission fluid and heavy metals. Therefore, the practice of spraying the treated waste water onto the ground surface throughout the facility is considered an REC. • 704. PRI.05 10 July 21, 2008