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Groundwater Sampling SOP <br /> Revision No 0 <br /> Date January 01, 1995 <br /> Page 2 of 5 <br /> • Alconox and tap water wash, <br /> • Tap water rinse, <br /> rise {the equipment shall be thoroughly wetted with <br /> Reagent Grade Methanol n <br /> Methanol), <br /> • Analyte-free water rinse, <br /> • Air dry <br /> WATER LEVEL MEASUREMENTS : in or <br /> A complete round of water level measurements must be collected prior to any purg g <br /> sampling activities Water level measurements, <br /> waterlevel measurements shall <br /> an <br /> nic water level indicator, <br /> pos <br /> sible ogio <br /> should be taken to the nearest 0 01 foot <br /> be taken on the North Side of the monitoring well at the top of the casing, unless a <br /> measurement point has been previously established <br /> PURGING STATIC WATER <br /> All information concerning the purging of static water including calculations must be <br /> recorded for each well The type of equipment used to purge the well must be <br /> described in the logbook If a pump is utilized information concerning the pump type <br /> and flow-rate must be included in the logbook <br /> When a bailer is used for purging and/or sampling activities it must be lowered gently <br /> into the well such that the formatio�e Sys are le notib�ncreased by improper as little as le It is <br /> purging <br /> very important that the turbidity of p <br /> and/or sampling techniques <br /> A minimum of three well volumes of the standing water column will be purged from <br /> the well prior to the collection of samples Monitoring well purging will continue <br /> until groundwater temperature, pH, and specific conductance has stabilized for three <br /> measurements each following the removal of one well volume If five well volumes <br /> are removed then, only one set of water quality measurements is required on the final <br /> purge volume No more than five wells volumes shall be removed during purging <br /> activities Over purging the well may result in the collection of non-representative <br /> groundwater samples <br /> If the well does not recover quickly enough to permit removal <br /> em d tel following <br /> of three well <br /> volumes, the well will be pumped or bailed dry and sampledy <br /> sufficient recovery Generally, bailing the stainless steelo <br /> adequate <br /> Tefln bailer orthe l <br /> be <br /> performed utilizing a properly decontaminated <br /> appropriate pump <br /> CAGWSOP DOC <br />