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' 6 010 vwafTechn ws Inc Page 4 Monitoring Well Installation Work Plan J M Equipment Co Project No 5072 November 6,2000 ' above the 0 020 inch screened interval A two-foot granular bentonite transition seal will be installed and hydrated A surface seal will be achieved by pumping a neat cement grout (augmented with < 4% bentonite) via a tremie tube The well will be secured with a locking watertight cap encased in flush mounted traffic rated well box After the well sealing materials have set (>24 hours) the well will be developed (using ' mechanical surging and pumping methods) until a clear stream of water is obtained The well will be purged and ground water samples collected no sooner than 48 hours after well development All development and purge water will be containerized in 55 gallon DOT approved containers and stored on site until their disposition can be arranged A licensed land surveyor will survey the top of casing measuring point for the well into an official benchmark or arbitrary plane ' 2.2 Ground water Sampling Procedure The ground water in the new well will be sampled no sooner than 48 hours after well ' development and from there after on a quarterly basis The following is a procedure for the sampling of ground water from the well Before sampling is attempted the well will be sounded for depth to water and then a clear disposable bailer will be used to determine if floating product is present The well will be purged of at least 3 well volumes of stagnant water using a Waterra pump, submersible pump or a stainless steel bailer Purging will continue until the temperature, conductivity, and pH of the ground water has stabilized (<10% variation between three readings) indicating that formation water representative of aquifer conditions is entering the well These water quality parameters are measured at intervals of each well volume purged In addition, the parameters of dissolved oxygen (DO) and oxidation-reduction potential (ORP) will be measured and recorded ' A stainless steel or disposable plastic bailer will be used to collect each sample Care will be taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to the VOA vial and glass amber liter bottles Once the sample container is filled and ' capped, the bottle will be inverted, tapped, and checked for headspace bubbles The sample container is identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory ' All non-disposable sampling equipment is decontaminated using a steam cleaner before and between uses Disposable gloves will be used by the technician to collect all samples and will be changed with each sampling event Bailer blanks for each sample, along with a field ' blank (prepared from water provided by the sample technician poured into a VOA vial on site), will accompany the samples to the laboratory and serve as checks against cross contamination ' A chain of custody document, listing all samples collected, accompanies the samples from field to laboratory, thereby providing a means to track their movement and insure their integrity All water purged from each monitoring well and not used as a sample, will be placed in a 55 igallon DOT approved container, properly labeled and stored on site