ARCHIVED REPORTS_XR0012617 - Laserfiche WebLink

Home Browse Search

1 610 A.5 WELL SURVEY Tile 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 an,i ending at the datum is closed to±0.01 feet according to standard methods described by Brinker and Wolfe(1977). A.6 GROUNDWATER SAMPLING The new wells are sampled no less than 24 hours after well development. A.6.1 Sampl:r.b Equipment Preparation All well measurement and sampling equipment are constricted of inert material whenever possi- ble. Sampling bailers are constructed of Teflon. Stainless steel submersible or airlift pumps, 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 into each well: I. Bailers, pumps, suspension rope and lines, and well sounding tapes are rinsed thoroughly with clean,fresh water 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 a well. 5. Bailers and pumps are suspended on clean, DI-water-rinsed polypropylene rope. The rope is discarded after tach well. A-3 .3N73942tn•y91f.j.