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these properties, and a significant percentage of these releases will display contaminant levels above applicable state regulatory standards. 'Therefore, sonic form of envirotnnental cleanup will be required for many of these properties. Due to the physical characteristics(particularly its density being greater than water)and the health-based risks associated with PCE, this contaminant and its degradation products have proven to be difficult and expensive to remediate. The case study documented herein involves a typical strip center property contaminated by a PCE release fi-orn a small dry cleaning operation located in Arlington, Texas. hr our professional experience, the release history, subsurface conditions, contaminant types and concentrations at this site are typical of these properties in Texas as well as other states. Hydrogen Release Compound(IIRC)developed by Regencsis offers a viable option for the remediation of groundwater at these PCE contamuiated sites. Contamurant concentration and gcochemical data clearly indicates that the injection of I-1 RC at the subject dry cleaner facility greatly accelerated the reductive dechlorination of PCIS and its degradation products and has allowed the site to achieve a Conditional Certificate of Completion fro» the Texas Natural Resource Co1lSeCVati011 Commission ('I'NRCC) Voluntary Cleanup P'rogr'am. SITE CIlARACTERISTICS Site Background and History. The site is located in Arlington, 'Texas and is approximately 7 acres and contains two one-story multi-tenant strip shopping centers constructed in 1979. A former dry cleaner was situated in the small suite shown in figure 1 and conducted dry cleaning operations on site between approximately 1982 and 1992. Phase 1 and 11 Environmental Site Assessments were conducted at the site in 1996, and the site was admitted into the TNRCC Voluntary Cleanup Program in November of 1996. A release of an unlalown amount of chlorinated solvents (apparently PCE) had occurred at the dry cleaners and had affected soil and groundwater beneath the site. Based Oil tine results of these investigations, PCE and degradation products (trichloroethylene Cl'CE), cis-1,2,-dichloroethylenc(cis-DCE),trans-1,2--DCE(trans-DCE), and vinyl chloride (VC)] were identified as the chemicals of concern (COCs) for the subsequent Site Investigation Report(SIR)and Conceptual Frivironnlental Assessment Model (CLAM; i.e., health-based risk assessment) required by the Voluntary Cleanup Program. The STR and CEAM were completed in 1996 and 1997,respectively. The SIR has documented the installation of 1 I groundwater monitoring wells and l3 soil borings at the site. The CF.AM was prepared to identify potential human health risks associated with the historic release and idcntifrect potential receptors (constnretion workers and on site commercial workers) and exposure pathways (inhalation of vapors and dermal contact with perched groundwater). The CEAM also established site target cleanup concentrations ['or soil and groundwater. Site target concentrations for groundwater are, as follows:PCL- (500 ug(L),TCE(500 ug/L),cis-DCE(7,000 ug/L),VC(200 ug/L).