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casin <br />r1l <br /> S', the pumP May.the purg�n Y then be moved ro <br /> g progrtSS, If dte midscreen intern ,,,RIX <br /> monitoring well, ' 1equired. If a bailer is used to �EpM <br /> It will be al to complete <br /> Potential for aeration of gently lowered ' purge the <br /> ' water. Into the well to reduce the <br /> minimize differential drawdow !'urging will <br /> the filter n between the Interior oft a rate intended to <br /> materials Iinit cascading water alon <br />' casing, procedures for the well scree <br /> Section purging slow! g the gide nand <br /> A.3. Y recharging wells of the Well <br /> are discussed in <br />' A mtmmum of four well casino <br /> whichever iso a volumes or <br /> seater, will be re one saturated borehole volume <br /> of groundwater s moved to purer well <br /> I equipment. If a loWples if the well will be pur the prior to collection <br /> ed <br /> micro g flOW capacity PUMP is dedicated non-dedicated <br /> pure method described in Section A.4 may m the Well, the <br /> Purge volume• If the well goes dry before four ybe used to reduce the <br /> removed, the <br /> ng <br /> saturated procedure discussed in Section A. will be followed e The <br /> borehole volume is the volume of water in the well casing the volume of water in <br /> and packer, a caSin the filter pack. For a well with a dedicated perms <br /> casing below g volume is defined as the vol <br /> the inflated packer. ume of water i p <br /> m the well <br /> Periodic observations of turbidity <br /> and specific electrical conductance and measurements of temperature, pg <br /> equipment duringlance (SEC) will be made with field <br /> representative purging <br /> to evaluate_whether the water samples <br /> minimum of four sets of target zone. Samples will be collected when: <br /> temperature, Parameter readings have been taken; (l) a <br /> turbidity pH, and SEC reach relatively constant values and (Z) the <br /> ry has stabilized. , and the <br /> A.2 a�ZnDlino Monim <br /> The samplerwill weclean gloves appropriate <br /> ar <br /> concern while collectin gloves for the chemicals of <br /> laboratory-propg the sample. Samples will be collected directly in <br /> ared bottles from the sampling device. <br /> Each sampling episode or day should generally begin with <br /> the least suspected concentratiet ons of targcoin ounds, the Well having <br /> should generally be sampled in sequence of increasing suspected ive wells <br /> concentration. <br /> A Teflon' bailer, new disposable bailer, stainless steel positive <br /> displacement Teflon' bladder pump with Teflon' tubing <br /> submersible pump with low-flow sampling capacity or a clean electric <br /> will be used to collect <br /> the water samples for laboratory chemical analysis. <br /> SAMPLING Of GROUNDWATER MOMTORING WELLS <br /> MSC'ROTO_,IW AND WATER SUPPLY WELLS <br /> L'(T <br /> REVISION DATE:MARCH 19% Page' of 10 <br /> MW <br />