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• Drilling of one soil boring (B-1 to 81.5 feet) and one monitoring well (MW-4 to <br /> 95 feet) by a Remediation Services, Inc. (RSI) subsidiary, BSK & Associates <br /> (BSK), in October 1992. <br /> • Drilling of four soil borings (B-101 to 75 feet, B-102 to 75 feet, B-103 to 75.5 <br /> feet, and B-104 to 75 feet) by BSK in February 1993. <br /> • Installation of two monitoring wells (MW-5 to 90 feet and MW-6 to 89 feet) by <br /> BSK in December 1993. <br /> • Excavation of approximately 330 cubic yards of petroleum-impacted soil from <br /> the former UST pit and vicinity by IT in May 1995. A vapor observation point <br /> was constructed at the base of the excavation. The excavation was subsequently <br /> backfilled with clean imported fill material and capped <br /> • Drilling of two soil borings to 64.5 feet (SB-1 and SB-2) by IT in August 1995. <br /> • Quarterly groundwater monitoring by BSK and IT since October 1992. <br /> 1.3 Project Objectives <br /> Historically, TPH as diesel has been detected sporadically in groundwater sampled from <br /> monitoring wells at the site. When detected, concentrations have been low, ranging between <br /> 60 gg/L and 210 gg/L (the method detection limit is 50 gg/L). By increasing the oxygen <br /> content in the groundwater, studies have shown that the biodegradation rates of aliphatic and <br /> aromatic,hydrocarbons can be significantly enhanced (McAllister and Chiang, 1994; Smyth, <br /> 1995; Cozzarelli et al., 1994). <br /> This work plan proposes to increase the dissolved oxygen content in the groundwater at the <br /> site, and thereby enhance the intrinsic biodegradation of the TPH as diesel. <br /> 1.4 Scope of Work <br /> The scope of work described in this plan includes implementation and evaluation of a passive <br /> remediation method using an oxygen enhancer. Magnesium peroxide (Mg02) has been <br /> selected as the material that will increase the dissolved oxygen in the saturated zone. This <br /> compound has been shown to increase the oxygen content of groundwater at many sites while <br /> preserving the groundwater quality. A commercially available product, "Oxygen Release <br /> Compound" (ORC'� contains Mg02 in one-foot long self contained cylindrical permeable <br /> containers termed "filter socks." When exposed to moisture (groundwater at this site), the <br /> MZJa7-10-96JVDBF196-0017 2 <br />