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: i Pm A-5 WELL SURVEY The elevation of the top of the well casing is surveyed relative to an established datum using a Lietz C-3 automatic level and stadia rod. A small notch is cut in the top of the well casing to mark the survey point,to ensure that this point is used for all future water level measurements. A loop originating and ending at the datum is closed to-F0.01 feet according to standard methods described by Brinker ar_d Wolfe(1977). F, A.G GROUNDWATER 5A -'LING f� The new wells are sampled no less than 24 hours after well development A.6.I Sampling Equipment Preparation All well measurement and sampling equipment are constructed of inert material whenever possi- ble. Sampling bailers are constructed of Teflon. Stainless steel submersible or airlift pumps, jFr`t surface centrifugal.pumps with dedicated polyethylene tubing,or PVC bailers are used to purge the well prior to sampling,depending on depth to water. All sampling equipment is decontami- nated in the following manner prior to introduction Tito each well: 1. 'Bailers,pumps, suspension rope and lines,and well sounding tapes are rinsed thox+oughly with.clean,fresh•watef to remove dust and dirt: 2. All equipment is cleaned with Alconox detergent and deionized inside and out. The equipment may be cleaned offsite and stored and transported in steam-cleaned and protected inert containers. Fluids used to decontaminate equipment on the site are stored with other purge water. Nitrile gloves are worn at all times during sample equipment cleaning, handling, and sample collection. 3. All equipment is thoroughly rinsed with deionized (DI) water immediately ' after cleaning. 4. All equipment is thoroughly rinsed with DI water twice before insertion into d a well. 5. Bailers and pumps are suspended on clean, DI-water-rinsed polypropylene r rope. The rope is discarded after each well _. .._1 _- A.6.2 Presampling Measurements _ Prior to purging and sampling of each well, the depth to standing water and the total depth of the well are treasured with a decontaiminated.optical interface probe. A decontaminated;clear acryl- ic bailer is then inserted into the well to just below the static water Ievel and removed to confirm the presence/absence of any floating product. These presample measurement data are recorded �. p e42/71050/nov/aa A-3 f