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�. 55-gallon drums or other water storage facility • Well Development Forms �- 5. Procedure After completion of monitoring well installation, and no sooner than 48 hours following w- emplacement of the well seals, the well shall be developed as described below. Prior to insertion in any well, all equipment will either be decontaminated or will be deemed clean, or previously un-used,by the manufacturer. • Open all monitoring wells at the site and allow to equilibrate approximately 15 minutes. Denote time and visual observations regarding well access, condition, security, etc. in logbook. • Obtain initial depth to groundwater level readings from the point of survey mark, or from the 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. • Obtain depth to casing bottom for each well. Readings will be measured to the nearest 0.01-foot. Denote readings in logbook, and compare with boring log information. • Calculate the volume of standing water in each monitoring well. Denote the volume calculated for each well in logbook and/or on forms provided. • Alternate surging/swabbing of the screened interval and purging of the water: w.. — Surging/Swabbing: Using either a surge block, the purge pump, or a heavy bailer, swab the screened portion of the well by lowering the surge equipment to the bottom of the well, rapidly raising and Iowering the equipment in 2-foot intervals �- in a plunger-like fashion. This 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 w. bailer, since silts and clays can cause malfunction in the pumps. • Please note, to develop the entire screened interval,water must be present over LW the entire length of screen. In wells with little water or with very poor recharge, distilled water may be added to the well to ensure adequate development of the well. If water is added, the volume of water added must be documented, and the water being used should be sampled for the presence of contaminants. ti.. SOP MW Development 2 January 2004 L.