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s <br /> 3 r v <br /> e <br /> , 11 <br /> y _ � Stackkon,Calsfarnsa -� <br /> FoMer 76 Station No 6991, y <br /> Annual status Repot impacted soil was <br /> ozone Mlcrosparge`System h ard5 of 'potentially roduct lilies <br /> cub y dis eraser island's and P depth of 21 <br /> Se tember 2 2003 roxiinately�200 to a deo <br /> total of aprpiarlhwest and Southeasit was o,erexcavated <br /> 'F overex tedfd `` beneath the In addition, the USTP <br /> Ole ,from of the west UST <br /> inunediately north <br /> feet bgs laced into <br /> System Overview, <br /> acro 5pargmg� b � V Associates, wasp air is , <br /> Ozone M' - manufactured Y process where'ozone to dally <br /> ' ar itlg System, is a P ou specialty <br /> ozone rnicrosp g done Microsparging Per minute) <br /> S arg ber 19 2 6 cubic feet <br /> The C- p on <br /> December 204at lover flaw rates � " boles" As these irticzobuoxidized within <br /> operation oundwater create"microbe are rapidly _ <br /> introduced into the ante comp ds <br /> ers to (VO <br /> acro orous plastic sp g ° { through <br /> designed m p the dissolved volatile organic the tliirteen'(SWe The <br /> the Column of water, ection between ten of Figure 2) <br /> le the ozone/air Injection not being used) mutes <br /> is design to cycle Sp-10 are currently between 5 and 15 n' <br /> for betty <br /> The system 1, SP-3, and Dint 16 times per day, rocess <br /> Dints (Sp" each p evaluation p <br /> SP-13) sFarge p set to cycle through ed as part of the system <br /> be van hed to 3/4-�tnchblank <br /> schedule is currentlyclThe schedule can ar e points attar orous <br /> P, point per Y diameter ozone sp g 0-inch long irticrop <br /> 2-inch diam Composed of 3 etween <br /> CO with prints are �bottom of the boring� <br /> wells are .fie ozone spargefrom th int The two feet of` <br /> The sparge VC casing pular space <br /> Schedule 80 P sand is placed in the of each sparge watez in the bonng7 <br /> Lonestar#2116 arc)to 1 5 feet above the top <br /> plastic surf hydrated by the ground <br /> 40 and bS feet below °ted is filled with berttanitez5 sealed with neat cement <br /> ace in each boring ozone <br /> annular-space above the sandl� pace z Q panel includes an <br /> and the remainder of the annular y unistriit fsan1e Tit p able timer/controller <br /> Panel is mounted on a and a progra , Dint has a dedicated <br /> � os arge control padded oxygen' generator F1ach spargep - <br /> The ozone micr P ressor, the „ HDpE tubing for added protection <br /> Ml - air comp to the panel by 318 conveyance piping <br /> < generator, e connected VC <br /> -Sparge pointswas pulled through Schedule 80 F <br /> line The tubing r monitoring ' <br /> of selected giouiid�vater <br /> ater Sampling ling ling and <br /> Oronndw periodic same 7 ,Were selected for same <br /> effectiveness, p 16 and VW-7, r operation, <br /> while `�W-7 has <br /> 1n order to evaluate system site Wells " stem began p MW_7,was sampled <br /> been performed at the onthly basis since the system 2002, derground <br /> v�iells has on aYm of 2�2 Prior to 3uly <br /> ' MW_16 has been sampledto July adient of the <br /> - onthly basis starting e both located dow, <br /> gr one o f influence of one or <br /> led on a m 16 and VW ent area and oasts since August <br /> been Sam <br /> a monthly Wells Mw bath within the treatment led on a qualterly <br /> ' basis y are Appendix A <br /> e tanks (UsTs) W-16 and `7 have been sampled <br /> is attached as <br /> storag Wells M ontonngwell netw <br /> more sparge points ling data for them _ <br /> 1999 1iistoncal same µ <br /> y <br /> 2 <br /> 1Q0124 08 <br /> l—� <br />