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1 <br /> KLEINFELDER <br /> ' along the screened interval of the well is performed to draw the sediment from the <br /> formation into and out of the well, and to set the sand pack. The sediment laden water is <br /> airlifted from the well at a rate of between 0.75 and 10 gallons per minute (gpm) depending <br /> on recharge rate and casing size Development continues until the discharge runs relatively <br /> tclear of fines Approximately 5 to 10 well volumes are generally removed from each <br /> monitoring well. Discharge water is stored in 55-gallon drums and left onsite for later <br /> ' discharge or disposal, depending on laboratory results <br /> ' After the wells are developed, the aquifer is allowed to equilibrate for 24-48 hours The <br /> wells can then be purged and sampled During the purging of the wells, field parameters <br /> (pH, conductivity, and temperature) are monitored. Samples are collected after the field <br /> parameters have stabilized (normally requiring the removal of five well volumes). Water <br /> sampling containers are supplied by and prepared by the laboratory These <br /> sample containers are immediately sealed after sample collection and placed in an iced <br /> cooler. At the end of the day, the water samples are delivered under chain-of-custody to an <br /> ' analytical laboratory certified by the state for the planned chemical analysis <br /> M To prevent cross-contamination between wells, all developing and sampling equipment is <br /> thoroughly washed in a tnsodium phosphate solution and rinsed in distilled water or steam <br /> cleaned prior to use in the next monitoring well. <br /> 1 <br /> SOIL CUTTINGS AND WATER DISPOSAL <br /> Drill cuttings, development water, and purge water are placed in 55-gallon drums and left <br /> onsite for disposal by the owner Kleinfelder will coordinate disposal of soil and water with <br /> ' contractors after chemical analysis results are available <br /> ' 145-88-2013 <br />