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MAS 18. 19 8 i [!, SAI( c�84 <br /> i <br /> Regenesis internet site at l ttp://twvw.regenesisxom). At the McMuIlin site we propose to inject ORC <br /> manufactured by Regenesise both in the saturated zone and in the unsaturated zone to enhance aerobic <br /> 1] biodegradation of the petr0eum hydrocarbons and achieve so=e reduction(See Figure 2 for a <br /> conceptual layout of the remedy). <br /> RegenesisV QAC is composed of magnesium peroxide(MgOo. When Mg0 2 reacts with water, oxygen <br /> verts to a Mg(OH)j(i.e.,milk of rnagnesia)cement. T <br /> is released and the MgOz conhe 7eleased oxygen is <br /> used by existing aerobic pr,Kroleum degrading bactxria to biodegrade the petroleum hydrocarbons present <br /> in the subsurface. Regene ise claims that their ORC product is not toxic and is environmentally safe <br /> (See Technical Bulletins acid MSDS in Appendix Q. <br /> PURPOSE <br /> The purpose of this workp;,an is to provide a methodology for applying an ORC injection strategy to this <br /> site,and for monitoring the effectiveness of the technology at degrading petroleum hydrocarbons in the <br /> unsaturated and saturated i;ones. The workplan includes a description of the proposed ORC remediation <br /> system(including the loeai:ion of the ORC injeetiea points),a monitoring plan,a description of the <br /> proposed project report fbimr at,and an implemention schedule. Field methods proposed are detailed in <br /> Appendix A. A Health and Safety Plan prepared for the field work proposed in this workplan is included <br /> in Appendix B. <br /> BACKGROUND i <br /> Three previous site investigations have been performed at the McMuIlin Oras Dehydrator Station <br /> (Figire 3). The earliest site investigation was performed in November 1992 and consisted of driIling and <br /> sampling nine soil borings i(MC-BI through MC-B9)within and adjacent to the gas dehydrator station <br /> facility(PG&E 1993). Soil samples were collected and analyzed for petroleum hydrocarbons and BTEX <br /> compounds;groundwater samples were not collected. In April 1997,four additional soil borings (19-B 1 <br /> through 19-B4)were advanced and sampled with the boundaries of the site and soil and groundwater <br /> samples were collected f=orm each borehole(HLA 1997). The borings were drilled adjacent to equipment <br /> where there was a potentia,�i for chemical releases. The purpose of the April 1997 assessment was to <br /> determine if soil and/or greiundwater was impacted at the site. The most recent site investigation, <br /> performed in November acid December of I997,included drilling and sampling 8 soil borings within the <br /> site and on adjacent properties(B-6 through R-13), and installing four groundwater piezometers(PZ-1 <br /> through PZ-4)and four grcundwater monitoring wells(MW-1 through MW-4)(C IA Hill,personal <br /> 402_331-98 63.doc 1.3 <br /> i <br />