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). H. KLEINFELDER & ASSOCIATES <br /> ' o A 3—foot bentonite plug will be placed above the sand pack to <br /> provide a seal against surface water infiltration. <br /> ' o The remaining annular space will be filled with cement/bentonite <br /> ' grout to the surface utilizing a tremy system. <br /> o The well will be secured inside a cement utility box set flush to <br /> the ground surface. <br /> 3.4 MONITORING WELL DEVELOPMENT AND SAMPLING PROCEDURES <br /> ' The monitoring well will be developed several days after installation. <br /> The well will be inspected first with a clear acrylic bailer to visually <br /> ' check for any product layer or sheen. If not product layer or sheen is <br /> observed, the well will be developed with a surge block/air lift <br /> ' development tool. Surging with the tool along the screened interval of <br /> the well will draw the sediment from the formation into and out of the <br /> well and set the sand pack. The sediment laden water will be air lifted <br /> ' from the well at a rate of approximately 0.75 gallons per minute (GPM) . <br /> This process will continue until the discharge water runs relatively clear <br /> ' and free of appreciable fines. We anticipate approximately 5 to 10 well <br /> volumes will be removed during the development process. After the well <br /> ' has been developed, the formation will be allowed to stabilize for <br /> approximately one week prior to any sampling. <br /> The depth to the static water level will be measured prior to purging and <br /> ' sampling with a submersible pump. Field parameters (pH, conductivity, <br /> temperature) will be measured and recorded periodically during purging. <br /> Samples will be collected after the field parameters have stabilized and <br /> at least five well volumes have been purged. After collecting a sample, <br /> the sample bottles will be immediately sealed, appropriately labeled, and <br /> placed in an iced cooler. The water samples will be delivered to a DOHS <br /> certified analytical laboratory under chain—of—custody at the conclusion <br /> of the field day. <br /> To prevent cross—contamination, all developing and sampling equipment will <br /> be steam—cleaned prior to use in each monitoring well. <br /> 51-87-413 6 <br />