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10/21/2003 17:32 2098325152 WRIGHT ENVIRONMENTAL PAGE 03 <br /> Page 2 of 3 <br /> indicated that the ground water is seri-confined (under pressure),thus the water in <br /> monitoring wells may be higher than the actual ter level in the aquifer. Boring lags for <br /> B-2,B-3 and MW-3 show that the first incidence; f ground water was at 42-it to 44-ft <br /> below grade witlu statxe water level stabilizing at 'ro=d 40 feet,indit eing"the <br /> ground water is under 2 to 4 feet of head at these oorLions. The boring logs for MW-1, <br /> MW-2,B-2,B-3 and MW-3 all show sand or silt and present batwoon 45 to 50 feet <br /> (logs go only to$0-ft depth), The CPT-based or sections AA' and lata'indicate that <br /> the 50-60 ft interval oonsists of sand attd sandy/si t wilt some gravelly sand lingers. 1'ttus <br /> the saturated thiaknees to be rernediated begins the end of the silt sequence and <br /> transitions into the sand sequence immediately ow it- We believe the saturated <br /> thickness be regardod as a single unit from about j 5 feet to about 60 feet for the purpose <br /> of designing ozone injection wells. <br /> The ozone injection well will target the zona of h guest ground wet"concentrations in <br /> the soutve area. The sparge point(the trier*-pops section)will he installed at the <br /> bottom of the aquifer ducknOss to be remediated.i This design will provide proper labmW <br /> and vertical dispersion of the released ozone&M:nuwe adequate coveMc of the plume, <br /> The radius of influence(ROI)is related to injecti` n depth, soil permeability, and <br /> intercxmuacted pore eharmels present in the sub ' ace. For this site the Rpt,based on <br /> injection depth and soil type is estimated at 20 to 5 feet. Six wells are proposed whose <br /> locations are shown on Figure l. The well fletwr will thorougWy cover the onsite <br /> plume over an area aipproximately 60-ft x 60 ft x, S ft(saturated thickness). A typical <br /> well cortstrmfien deWl is shown on Figure 2.'VIS esrittrate the system will require an <br /> injection pteu=of 15-25 pounds per square i and up to 5 cubic feet per'minute of <br /> ozone per well. <br /> If you leave arty questions, please call the under <br /> s trod, �`•���:t�' "e;sr,;.4�yy�. <br /> Siomely i U,0141 U <br /> Wrigbt Eavimanxwtal Ser'vk%Inc. lxR. --Za - r' <br /> ti <br /> /John Lynch R.Magbool Qadir,PE Tnpro Solution, Inc.) <br /> presidem CH 476 <br /> Attachrnestb:Figures l and 2, Draft Crass Sections AA" and BB', boding logs fim r <br /> origitlil site investigation <br />