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Site Assessment Report <br /> September 24, 1997 <br /> ' three fuel dispensers each, two diesel and one unleaded. Three underground tanks that <br /> appear to be 10,000 gallons each support the facility. The property owner reports that <br /> ' these tanks were replaced in 1986 with state-of-the-art tanks to include double wall <br /> containment and alarm sensors. On the east edge, running parallel to the islands, is a <br /> ' commercial truck scale which was constructed in 1946. This scale is approximately 80% <br /> covered by the overhead canopy and is 11 feet wide by 70 feet long (see photo 6). <br /> 1 Limited inspection of the scale showed that it is constructed within a concrete retaining <br /> vault at a depth of 4 feet (see photo 7). Adjacent to the scale is the scale house that is <br /> ' partially cover by the overhead canopy. The scale appeared to be in working order; <br /> however, it was not in operation during Amherst's inspection. <br /> From Amherst's visual inspection, the majority of the surface contamination noted was <br /> ' diesel and was concentrated around pump island #2. The concrete decking in the area <br /> surrounding both islands is severely cracked and in one area, adjacent to pump island <br /> #2, the slab was broken and subsided on one side (see photo 8 and 9). Visual <br /> inspection of the cracks in the area of island #2 showed that, in many cases, the cracks <br /> have expanded to a point that, once the debris and surface dirt are removed, the <br /> ' underlying soils maybe exposed. <br /> At no time during the inspection did Amherst observe the reported traffic-generated <br /> hydraulic effect of free diesel from beneath the concrete. <br /> 1 <br /> The drawing enclosed shows the areas of diesel staining on the concrete apron in and <br /> ' around the fueling islands. A large area around the north end of island #2 appears to <br /> have had greater surface staining given the residual fuel left in the cracks and expansion <br /> ' joints in the concrete apron. This area may have been the location of the spill that <br /> prompted the call to the Health Department. <br /> One primary area of concern was noted during this inspection. A portion of the concrete <br /> apron has subsided (see photo 9 and drawing) in the reported spill area and subsurface <br /> ' soils beneath the concrete are most likely impacted with diesel due to the spill. <br /> i <br /> 3 <br />