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Ms. Lori Duncan & Mr. NuelOnderson December 14, 2006 <br />Page 3 <br />■ Existing water level data generally indicate a nonplanar water surface and are suspected to be erroneous <br />due to either survey or transcription errors. <br />■ Some past modification has been done on one or more wells. <br />■ Subsidence or other factors have affected the wells. <br />Evaluate In -Situ Remediation of the Silty Shallow Saturated Zone (~20-40 feet bgs) <br />Shaw recommends evaluating remediation of the finer -grained portion of the impacted saturated zone (from <br />the water table to approximately 40 feet bgs) by the following: <br />■ Direct chemical oxidation <br />■ Stimulated biodegradation <br />Evaluate In -Situ Remediation of the Sandy Intermediate Saturated Zone (-40-65 feet bgs) <br />Shaw recommends evaluating the costs and effectiveness of remediating the sandy portion of the impacted <br />saturated zone (approximately 40-65 feet bgs) by the following: <br />• Groundwater extraction and treatment <br />■ Sparging of air, ozone, or other gaseous fluid <br />■ Direct chemical oxidation <br />■ Stimulated biodegradation <br />Evaluate Current Human Health Risk <br />Shaw recommends evaluating the risk to human health presented by the potential inhalation of fuel <br />constituent vapors from the unsaturated zone. <br />(End of response) <br />Should you have any questions or comments, please contact the undersigned at your earliest convenience. <br />Sincerely, <br />SHAW ENVIRONMERTAL, I <br />Dan Wynne, P.G., C.E.G., C.H.G. <br />Project Manager <br />KA120221 Don Rodgers\Ltrs\Fecommendatlons.dw Shaw Environmental, Inc. <br />