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KLE/NFELDER <br /> �Bri9Ft RaPIe.Pi9Ft5olu0on= <br /> • The wells are secured in a locking stovepipe. The well heads may be <br /> enclosed in a cement utility box set flush to the ground surface located in a <br /> traffic area. <br /> A-3.2 Monitoring Well Development and Sampling <br /> The wells are developed to reduce the effects of drilling on the formation and to <br /> increase the effective hydraulic radius of the well. <br /> Monitoring wells are generally developed 24 to 48 hours after installation to allow the <br /> grout to set. Each well is first sampled with a clear acrylic bailer to visually inspect for <br /> hydrocarbon layer or sheen. If no product layer or sheen is observed on the water, the <br /> well is developed by surging, pumping, or bailing. Surging along the screened interval of <br /> the well is performed to draw the sediment from the formation into the filter pack and <br /> the well and to set the sand pack. The sediment laden water is purged from the well at <br /> a rate of between 0.75 to 10 gallons per minute (gpm) depending on recharge rate and <br /> casing size. Development continues until the discharge runs relatively clear of fines. <br /> • Approximately 5 to 10 well volumes are generally removed from each monitoring well. <br /> Discharge water is stored in 55-gallon drums and left on site for later discharge or <br /> disposal by the client, depending on laboratory results. <br /> After the wells are developed, the aquifer is allowed to equilibrate for at least 24 to 48 <br /> hours. The wells can then be purged and sampled. Purging and sampling may be <br /> accomplished with Teflon bladder pumps and/or bailers. During the purging of the wells, <br /> field parameters (pH, conductivity, and temperature) are monitored. Samples are <br /> collected after the field parameters have stabilized (normally requiring the removal of <br /> three to five well volumes). Water sampling containers are supplied and prepared by <br /> the laboratory. These sample containers are immediately sealed after sample collection <br /> and placed in an iced cooler. At the end of the day, the water samples are delivered <br /> under chain-of-custody to an analytical laboratory certified by the state for the planned <br /> chemical analysis. <br /> A-3.3 Sample Handling <br /> After labeling, the sample is immediately stored in an iced cooler for transport to the <br /> • analytical laboratory. The label includes Kleinfelder's name, job number, the date and <br /> 117226.E02/ST012R0696 Page A-5 September 14, 2012 <br /> Copyright 2012 Kleinfelder <br />