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Nl-lnfu na • • Project No 1232 <br /> January 28, 1999 <br /> Page 2 <br /> • <br /> page 22 of the CAP and as shown in Figure 15 of the CAP) EAI's recent experience in <br /> installation and operation of deep double screened wells used for air sparging and vapor <br /> extraction showed that installation and removal of the packer required significant efforts <br /> and did not preclude air leakage through the packer <br /> At the same time, EAI will use existing well VEW-1 A as an air sparging well by installing <br /> a packer dust below an upper screen to reduce to a minimum the ground water counter <br /> static pressure <br /> 2.0 AIR SPARGING AT NEW WELLS <br /> (Wells VEW-3 through VEW-5) <br /> EAI proposes to perform in-well sparging at wells VEW-3, VEW-4 and VEW-5 by <br /> installing a 3/4->nch sparging tube inside each well The latest ground water analytical data <br /> indicate high concentrations of dissolved hydrocarbons in ground water at these locations <br /> The CAP does not address this issue <br /> You verbally indicated in previous conversations that any changes to the County approved <br /> CAP would require the submittal of a new revised CAP In EAPs opinion, the changes <br /> outlined herein are not significant and are only refinements to improve the remedial <br /> system, and as such, do not require the submittal of a new CAP <br /> Your assistance on this matter will be greatly appreciated Please call meat 7141632-8521, <br /> ext 240 or Steven Bright at ext 224 if you have any questions or need additional <br /> information <br /> Sincerely, <br /> ENVIRONMENTAL AUDIT, INC <br /> Boris Stolin, P E <br /> Manager, Environmental Engineering <br /> BS SAB sh <br /> Attachments Figure I <br /> Cc Ed Koberste>n, Montgomery Ward (w/attachments) <br /> Mark Gilmartin, Gilmartin & LeBerthon LLP (w/attachments) <br /> BS WORD 1232CAP-ALTI <br /> ENVIRONMENTAL AUDIT,INC <br />