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' gTound water c0ded off site, and some residual sorbed soil Contamination <br /> mmainod on sew. There was no evidence of free-phase product on the site greater <br /> than a slight sheen in the existing monitor wells before the start of the <br /> invcsbga.tion. The depth to ground water at the site is approximately 1.5 in below <br />' ground surface and the soils at the site are primarily composed of alluvial sands, <br /> silts, and clays (GRAM, Inc. 1995), <br />' Yrvduct Dia ipdon. The product selected for use in prov�dL.ng oxygen to the site <br /> was ORC*. ORCO is a patented solid form of magnesium peroxide that releases <br /> oxygen when hydrated. The product is delivered from the manufacturer in nylon <br /> `filter socks.' Each filter sock is composed of a tight weave polyester and contains <br /> a 1-1 mixture of ORCO and #90 silica sand and weighs 5.7 kg (Regenesis, 1995). <br />' FULL-SCALE SYSTEM <br /> As a result of the pilot study, GRAM, Inc., in conjunction with Regenesis <br /> Bioremediation Products, designed and installed a full-scale oxygen distribution <br />' system to use ORC*. The purpose of the full-scale system was to evaluate the <br /> effectiveness of a full-scale application of ORC* and, if possible, to prevent future <br /> off-site rmgradon of dissolved phase aont-amu don The full-scale system consists <br />' of 20 6-inch PVC ORC� source wells installed to form two permeable barriers <br /> The location of overhead power lines prevented the installation of one continuous <br /> bamer at the south-eastern most area of the plume A long bamer, consisting of <br />' 15 source wells, and a slightly off-set shorter barrier, consisting of 4 source wells, <br /> were irLstaved The source well used fur the pilot study is part of the long barrier. <br /> Additional source wells were installed dunng March 1995 The layout of the full- <br /> scale system is shown in Figure 1 <br />' E OR uO ue 410ao Ar lrq lea r7o kse !w 170 aD <br /> !� m <br /> 130-r.vwft$-11 5-WOOO �e <br /> G <br /> NM-0-am .. <br /> U <br /> 25Wtw WAS&1 i-Il • <br /> no, r a a ` OQO <br /> no Oo00000ADO <br />' X « p Olt lrov Y11 •' <br /> • Y.�e Jw� <br /> ®fl.l=Mr 4Rt� Rpl Y.0 <br /> Q <br /> Z W Ja4 < lrJa ! QG 0 !M ! <br /> Fasting,X-OW M1ws]ra Std PLdne eoorr*WM Srawn <br /> FIGURE 1. Shell North-Main Detailed Site Map <br /> '0 <br /> S0 d d6Z = 90 66- 17t -tea❑ <br />