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0 0 <br />ARCADIS BBL Ms. Victoria McCartney <br />August 31, 2007 <br />February 1998, and have typically ranged between approximately 18 to 24 feet below <br />grade since 1999. Therefore the current screen length of 10 feet, and screen interval <br />of 17 to 27 feet below grade is appropriate for the purpose stated above. <br />It is unclear what specific field data will be used and how it will be utilized to <br />achieve the desired investigation objectives when installing these wells. <br />Depth to water level measurements will be taken from the existing monitoring well <br />network to approximate the depth to the water table on the day of well installation. <br />Soil lithology observed in the deep soil boring will also be reviewed prior to well <br />installation to assess the soil unit to be screened in the shallow wells, and determine <br />an appropriate separation of the base of the screen, and the sand unit commonly <br />observed at 30 feet below grade. <br />...EDH directs that groundwater samples collected from the new wells also be <br />analyzed for df -isopropyl ether (DIPE) and 1,2-dibromoethane (EDB) during the <br />initial sampling event. <br />The initial round of groundwater samples collected from the four proposed monitoring <br />well clusters will be analyzed for DIPE and EDB in addition to the list of analytes in <br />the Work Plan, as requested by the County. If DIPE and EDB are not detected <br />during the initial groundwater sampling event, these compounds will be omitted from <br />the analyte list for future sampling events for all monitoring wells as per the County's <br />comment letter. <br />If you have any questions or comments regarding the contents of this letter, please <br />contact either David Evans of ARCADIS BBL at 916.857.0124 extension 226 or by e- <br />mail at david.evans@arcadis-us.com or David Lay of ARCADIS BBL at <br />315.671.9197 or by e-mail at David.Lay@arcadis-us.com. <br />Sincerely, <br />n �- <br />ARCADIS U.S., Inc. <br />( No.57358 <br />David W. Lay, C.P.G. Allen Just, P.E. s rL"3 f IL <br />Senior Geologist r <br />CI <br />9 Senior Engineer a'eo� _', O,a <br />Page: <br />cn.,ummn9 xusan annxn oecu�nncew,.,ea� 213 <br />