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MR should force water in and out of the screened interval. Repeat the surge/swab at least 10 times at each 2-foot interval. Then swab the next two-foot screened interval. Follow each round of surging by purging. — Purging: Following each round of surging of the screened interval, the well shall be purged of water. Be sure to lower the bailer to the bottom of the well in order to"grab"the silts and clays that have settled to the bottom of the well. If a well has a large portion of fines, then the purging may be performed only using a bailer, since silts and clays can cause malfunction in the pumps. • eened interval, water must g present over the entire Please note, to develop the entire scr length of screen. In wells with little water or with very poor recharge, distilled water may be t of the watery added mull to ensure st be documented,and the waternbe ng used well. houuld be sampled fwater is added, or the of presence of contaminants. • screened interval has been adequately swabbed and Continue the process until the entire purge water is relatively clear of fine material. Contain all purge water in the drums or other containers provided. Denote the date, time and origin of the water on the containers. Include calculation of the volume of water removed from each well and observations of the presence of sediments and color/odor of water, etc., in the logbook and on the forms provided. • el readings from the point of survey mark, or from the Obtain final depth to groundwater lev North side of the top of the PVC casing, if not point of survey mark is present. Readings will be measured to the nearest 0.01 foot. Denote time and readings in logbook and on forms provided. • Conduct final decontamination procedures of any field equipment that is not disposable. • Close and secure each well upon completion of field activities. Ensure that all water storage containers are closed and secured and that the site is clean. GHD SOP MW Install&Dev 6 of 6 Rev 2114