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Ground-Water Well Development <br /> Well development of a newly installed well shall begin 24 to 48 hours after the well is <br /> winstalled to allow cement to harden sufficiently. The well is cleared of disturbed sediment <br /> and water before water samples are collected. All well development tools are thoroughly <br /> ols may be either a stainless steel,teflon,or PVC <br /> cleaned prior to use. Well development to <br /> bailer, hand pumps or submersible pumps. Surging may be required to remove loose <br /> sediments. For complete development,the wells will be pumped until the discharge is clear <br /> or the turbidity has not noticeably changed within one half hour. A pH and conductivity <br /> meter may be utilized to determine if the groundwater parameters have stabilized. <br /> (:round-water aam lin <br /> W Prior to sampling,the wells are sounded to determine product levels,water levels,and total <br /> -water moni <br /> volume of water. Each ground toring well is purged of at least 3 well volumes <br /> of water using a mechanical or hand-operated pump, or bailer. Conductivity, pH, and <br /> temperature are generally measured during the purging procedure to verify that these <br /> characteristics are stable prior to sampling. Stable in this situation is three consecutive <br /> readings within 15% of each other.If the wells are emptied before three well volumes are <br /> removed, the sample shall be taken when the water level in the well recovers to at least <br /> 80¢/0 of its initial water level. <br /> Samples are then taken immediately after purging using a teflon bailer and transferred into <br /> 40 milliliter (ml) glass vials with Teflon septum lids using a collection procedure that <br /> precludes air from entering the 40 ml sample vials and prevent the release of volatile <br />