The Cost of Capping a Solid Waste Site with Asphalt

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ENVIRON International Corporation

2003

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Abstract

This paper presents the actual costs for the permitting and construction of a recently completed

asphalt cap project in San Diego, California. Auto-shredder material and burn ash (ash) were

deposited in an area of approximately 1.1 acres (site) within two contiguous parcels of land. The site

was part of a former salvage yard, which operated at the site and at the property to the south

between approximately 1968 and 1977. The salvage operations consisted of shredding automobiles,

major household and industrial appliances, and other scrap; salvaging their recyclable metal

content; and landfilling the remaining material on-site. The ash, which originated from a local

municipal landfill with burn dump operations, was deposited at the site in the late 1980s.

Following the completion of remedial investigations and a feasibility study, a remedy was selected

for the site, which consisted of leaving the ash and the auto-shredder material in place and

constructing an asphalt cap over them. The primary purpose of the asphalt cap is to prevent

erosion of the ash and the auto-shredder material from the site. Further, the asphalt cap

substantially reduces infiltration of surface water into the ground water.

Four quarters of ground water monitoring were performed following the construction of the asphalt

cap. In February 2003, the County of San Diego Solid Waste Local Enforcement Agency issued a

“no further action” letter for the site. At about the same time, oversight responsibility for the long-

term maintenance of this closed solid waste site was transferred from the County of San Diego

Solid Waste Local Enforcement Agency to the City of San Diego Solid Waste Local Enforcement

Agency.