Laserfiche WebLink
' k%j KLEINFELDER <br /> ' Monterey sand to approximately 2 feet above the top of the perforated <br /> section. The sand size selected will be compatible with the PVC slot size. <br /> o A 3-foot bentonite plug will be placed above the sand pack to provide a seal <br /> against surface water infiltration. <br /> o The remaining annular space will be filled with cement/bentonite grout to <br /> the surface. <br /> ' o Each well will be secured inside a locking well cover. <br /> ' 3.3 MONITORING WELL DEVELOPMENT AND SAMPLING <br /> All three monitoring wells will be developed after installation. Each well will be first <br /> ' sampled with a clear acrylic bailer to visually inspect the sample for a product layer or <br /> sheen. If no product layer or sheen is observed on the water samples, the wells will be <br /> ' developed with a surge-block, air-lift tool, and/or bailer. Surging along the screened <br /> interval of the well will draw the sediment from the formation into and out of the well and <br /> ' set the sand pack. The sediment-laden water will be air-lifted from the well at a rate of <br /> approximately 0.50 gallons per minute (gpm). Each well will be developed until the <br /> ' discharge water runs relatively clear of fines. Approximately 5 to 10 well volumes will be <br /> removed from each monitoring well. Water removed from the wells during development <br /> will be containerized in DOT approved 55-gallon barrels and stored on the site pending <br /> ' results of water analyses. <br /> ' After the wells have been developed, the aquifer will be allowed to equilibrate. The wells <br /> will then be purged and sampled. During purging, field parameters (pH, conductivity, and <br /> ' temperature) will be monitored to provide indications of the stabilization of the purge <br /> water. When the field parameters have stabilized, it is assumed that the water is <br /> representative of water in the formation. Samples will be collected after the field <br /> parameters have stabilized (normally requiring the removal of 5 well volumes). After <br /> ' collecting a sample, the sample bottles will be immediately sealed, labeled and placed in an <br /> iced cooler. At the end of the field day, the water samples will be delivered under chain-of- <br /> custody to a state/EPA certified analytical laboratory. <br /> 129-88-1378 5 <br />