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KLEINFELDER <br /> O S-f0 _ S .__ t <br /> surface waw <br /> o The remaining a filled to the` surface with tremmied <br /> cement/bentonite grout to the surface*: <br /> o 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 increase <br /> 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 well <br /> is developed by surging, pumping, or bailing. Surging along the screened interval of the <br /> well is performed to draw the sediment from the formation into the filter pack and the well <br /> and to set the sand pack. The sediment laden water is purged from the well at a rate of <br /> between 0.75 to 10 gallons per minute (gpm) depending on recharge rate and casing size. <br /> Development continues until the discharge runs relatively clear of fines. Approximately 5 <br /> to 10 well volumes are generally removed from each monitoring well. Discharge water is <br /> sto S5-gallon drums and left oA-Mffiffiiwdischarge or disposal by the client, <br /> depe n 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 the <br /> laboratory. These sample containers are immediately sealed after sample collection and <br /> placed in an iced cooler. At the end of the day, the water samples are delivered under <br />