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1 a. <br />' ! s A s 8 8! <br />' ORC's Time-Release Feature: How It Works <br />' ORC is a proprietary formulation of magnesium peroxide intercalated with food-grade phosphate Tlais gives it the <br /> time-release properties that are critical in a passive,low-cost oxygen application system The term "intercalation"is a terin <br /> used here to describe the permeation of phosphates Into the crystalline structure of magnesium peroxide This inhibits <br />' transmission of water into the stricture, which creates the extended oxygen release The concentration and manner in <br /> which the phosphate is reacted and permeated within the crystal is critical in creating a product that is well suited to the <br /> needs of subsurface bioremediation <br /> Phosphate intercalation also prevents "oxygen lock-up" As water reacts with un-intercalated magnesium peroxide, a <br /> cement-like coating of magnesium hydroxide forms, which prevents water from penetrating deeper into the crystal to <br /> release all of the available oxygen ORC's phosphate intercalation keeps the crystal "open"and prevents tins problem <br /> 1 <br />' ORC Applications <br /> ORC is manufactured as a powder that when mixed with water forms a slurry for injection via direct-push equipment <br /> (Photo A), or the slurry may be used to backfill augered bore holes ORC powder is available in "filter socks",a string of <br />' ORC socks is lowered into a well through the length of the contaminated saturated zone where contact with ground- <br /> water releases the oxygen (Photo B) When depleted, the socks are replaced with new socks as necessary <br />'. 0RC1. applications are ea5�, fle-able, <br /> and may be designed to ni£et aA4 '34 4a q r F�vx <br /> 3{�rr{ /Yv�3•� 4i ry"ii '^`vw.,w.xn <br /> ,yo- :`i r¢�;T'i,4,�. ¢'i'}s',,•,'•'<4 f'r" <br /> o.'�.y Y; ,i�'.� .R ""w`"""a <br /> variety of rcinediafton objectives, Yi f ry F�xm <br /> sic { O.J�,0'r" <br /> Y�`rjir � • <br /> �•F�F A <br /> rvrmcr <br /> Underground <br /> 1 Source Treatment StUrabcTdnk •K ~ • {z x � Y F { # $ j <br /> Y Y• <br /> ORC slurry may be g r f r # <br /> applied by injection <br /> r <br /> in and around the con- <br /> tarninant source area to <br /> collapse the plume by <br /> remediating its source � 4k � ��•• _ � ,� "4''' <br /> t.omt��,�,,� �y �� ,{ # <br /> 2 Oxygen Barrier ;Y'A t- � 4t .,Yr `.,e$ :{7 40 <br /> OAC applications can be configured <br /> v r y <br /> to form a permeable"oxygen barrier gt,btn n <br /> edge <br /> f a migrating <br /> plume anleading <br /> o <br /> d tooavavoid potential doling adient " 6 „ t Photo B <br /> risk and liability <br /> 3 Excavated Tank Treatment 4 Localized Plume Remediation (not shown) <br />' ORC may be applied across the floor of an ekcavation Isolated areas of residual contamination can often <br /> . to eliminate over-excavation in pursuit of residual tont- preNent site closure ORC provides a low-cost, <br /> arninants and to create a zone of reniedial activity passive system to significantly accelerate natural <br /> which can manage new contaminant influx attenuation and achieve cost-eETective site closure <br /> GeoProbe,is.r mgmtemd rrLei mmk of Keir Lngineeun g Au <br />