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ARCADIS 88L 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 di-isopropyl ether(DIPE) and 1,2-dibromoetharne(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 /> or-ESS <br /> roN� <br /> Sincerely, o qr <br /> C�. . F� <br /> ARCADIS U.S., Inc. <br /> *, No.57358 i( <br /> Dav . Lay, C.P.G. Jy Allen Just, P.E. s,l CIVIL ,e <br /> Senior Geologist Senior Engineer 0F oAOr o��d <br /> Page'. <br /> 2/3 <br /> 4'1F'i:FtiaAA9]i)1V14"v.tOc]{iNi Ne:q:vx:.t WniaN:.:% <br />