Opal Group Inc.

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Hi-Yield CERCLA/VCP Remediation

Voluntary Purchasing Group, Inc.

Commerce, TX

Opal personnel assisted the law firm of Guida, Slavich and Flores, P.C. in the evaluation of a facility that was initially listed as a Texas State Superfund (CERCLA) site. On the basis of the evaluation, which showed that millions of dollars could be saved by changing the mandated remedy, Opal personnel assisted the law firm in renegotiation of a Consent Order to perform a Voluntary Cleanup Program (VCP) to clean up residential properties, remove contaminated sediments from an adjacent streambed and cap/encapsulate the former fertilizer/pesticide manufacturing facility. The State of Texas also concluded that the soils of over 98 residential properties and more than 3,000 lineal feet of sediments in adjacent Sayle Creek were contaminated with elevated levels of arsenic originating from the contaminated property itself. Rather than excavation and off-site disposal of all contaminated soils as originally proposed by the regulatory agencies, Opal personnel negotiated the construction of an on-site repository over the contaminated facility. This served to simultaneously mitigate impacts from the manufacturing facility property and resulted in an $8 million savings for the Potentially Responsible Party, (PRP). Opal personnel investigated, designed and constructed the renegotiated remedy. Contaminated soils from the residential properties and surrounding area were then consolidated within the newly constructed six-acre repository. The repository was lined and capped with a 20-mil High Density Polyethylene (HDPE) synthetic liner, clay buffer and revegetated topsoil. Negotiations were also held with each of more than 98 residential property owners for the total excavation of more than 38,000 cubic yards (yd3) of arsenic-contaminated soils from their yards. These materials were carefully removed and transported and consolidated in the newly constructed repository. All yards were backfilled and landscaped to original or better conditions. Concurrently, more than 3,000 lineal feet of Sayle Creek's heavily vegetated banks were cleared by Opal's personnel. An average of six to twelve inches of contaminated sediments from the stream bottom and banks were removed and similarly transported to the repository, dried, mixed and compacted with other affected soils. Finally, a 2,100-foot long, 30-foot deep, slurry wall was installed around the perimeter of the repository and keyed into competent shale to reduce ground water flow below the repository and further impacts to near-surface ground water.

Services/Disciplines/Materials: Arsenic, Cap, CERCLA, Design/Build, Liner, PRP, Repository, Residential Soils, Sediments, Slurry Wall