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7 I L E I t 4 p , L XjF-=� P t <br /> KLEI NFELDER <br /> � 10 <br /> August $ 1988 �� D <br /> File 24-1132-20 195 <br /> tAF-ALTH <br /> Mr David Carls <br /> NTA1- <br /> ES <br /> San Joaquin Local Health District �SERVI� <br /> P 0 Box 2009 <br /> Stockton, CA 95201 <br /> RE. Response to Comments Made on the Jordan Real Estate Proposal <br /> Dear Dave <br /> In response the Jordan Real Estate proposal, I mments you made am subnrutour ttt�ing thisletter lw�ch addresses your <br /> hone conversation <br /> regarding <br /> concerns <br /> 1 EDB Sampling - Since earlier sampling detected no EDBs and EDBs are <br /> listed as an optional parameter for soil sampling in the June 2, 1988, <br /> document Regional Board Staff Recommendations for Initial Evaluation <br /> and Investiggation of Underground Tanks,"we, do not feel that comprehensive <br /> EDB sampling iss to test thew ter sIn amplesonse tfrom the tour wo do ngr dientuest that we st for <br /> wells <br /> EDBs, we propose o <br /> for EDBs. <br /> 2 High Moisture Content - Appendix A, Klennfelder Field Procedures, is a <br /> general description of field procedures used by Kleinfelder staff. Since this is <br /> + a general description, not a of the techniques listed will necessarily be used <br /> in every investiggation. Usingg high moisture content as a criteria for selecting <br /> soil samples will not be employi diatdthJordan <br /> tsite <br /> if om aislandfill orue s useful <br /> surface <br /> in situations where there is q g <br /> impoundment <br /> 3 Well Development and Sampplingg - You were concerned that we proposed to <br /> pull samples from the wells 24 to Regional hours <br /> fer Quahtyter oConhol Board <br /> mentioned that Gary Johnson at the <br /> recommended that two weeks elapse between an development <br /> evelopmateriam hat may <br /> sampling Monitoring wells are developed pro remove the well lumen During <br /> hinder the free flow of ground waterg <br /> development, pressure waves are used to dislodge the blocking maternal <br /> These pressurwaves may <br /> watert the concentration of affectedby these wavesocannileot be used fanics or <br /> therefore, the volume of <br /> sampling. <br /> In his book "Ground Water and Wells;' F.G. Dnscoll states that filter packs <br /> for wells should be no thicker than 8 inches because the strong pressure <br /> waves generated during development do not travel much further than 8 <br /> inches If we conservatively assume that the ground water within a 1 foot <br /> radius of the well is affected by the pressure waves and cannot be used for <br /> sampling, we can look at how that volume of water can be avoided. <br />