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k4 KLEINFELDER <br /> SURVEY <br /> The elevation of the top of the PVC casings is usually surveyed and tied into permanent <br /> markers, if readily available Survey is to 01 foot for the "x" and "y" coordinates and 01 <br /> foot for the "z" coordinate. <br /> MONITORING WELL DEVELOPMENT AND SAMPLING <br /> Monitoring wells are developed after installation. Each well is first sampled with a clear <br /> acrylic bailer to visually inspect for hydrocarbon layer or sheen If no product layer or <br /> sheen is observed on the water, the well is developed by surging and pumping. Surging <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 /> 1 clear 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 .0- <br /> h' 1 (P'3 4JOiy <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 /> ' To prevent cross-contamination between wells, all developing and sampling equipment is <br /> thoroughly washed in a alcanox solution and rinsed in distilled water or steam cleaned <br /> li prior to use in the next monitoring well <br /> 121-88-1108 <br />