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• Tubing -- One-foot of silicone tubing (disposable) across the peristaltic pump is preferred to optimize ' pump performance, and polyethylene drop tubing (dedicated to well). Drop tubing can be inserted into.the • silicone tubing. Three sizes are available: Size 15 silicone 0.19 ID/0.17 x 0.25 poly, Size 24 silicone 0.25 IDI 0.25 x 0.375 poly, Size 36 silicone 0.38 ID/0.375 x 0.5 ID poly. 'M • Power Source—Rechargeable battery pack or car battery is preferred. If a fuel-powered generator is used, it must be placed downwind of the sampling area. • Flow measurement device—flow meter or graduated cylinder and watch with a second had. • Multi-Parameter meter with flow-through-cell (FTC)—Parameters which must be monitored are pH, ORP, eH, DO,turbidity, and T. Daily calibration must take place throughout the sampling event. • Decontamination Supplies (non-dedicated) — Distilled water, tap water, sprayer, buckets, brushes, non- phosphate detergent. • Sample bottles,vials, sample preservation supplies, labels,chain-of-custody(COC) forms. • Approved Health& Safety Plan, Workplan, and Field Sampling Plan to provide direction of work. • Well construction data and water quality data from previous sampling event. • Well keys and site map of well locations. • Groundwater sampling logs and calculator. ' • In-line filters, if needed (dissolved metals). • Ferrous Iron sample kit(Hatch Kit), if ferrous iron is to be sampled. • Poly sheeting that may be placed on the ground around the wellhead. ' • PPE as specified in the Site Health& Safety Plan. • Air monitoring equipment as specified in the Site Health & Safety Plan. • Tool Box. ,' • Drums for purge water. • Refer to Field Checklist for Check/Check Procedures for field supplies that may not be listed here. MPURGING AND SAMPLING PROCEDURES Pre-Sampling Activities (Non-Dedicated/Dedicated) 1. Sampling locations must begin at the monitoring well with the least contamination. 2. Check and record the condition of the wellhead for damage or tampering. If ground conditions warrant, lay out the sheeting to encircle the wellhead to minimize the likelihood of contamination of sampling or purging equipment. Place equipment on the sheeting. 3. Unlock the wellhead. Before proceeding, record location, time, date and other infonnation in the groundwater sampling log. 4. Remove inner casing cap. 5. Monitor the headspace for VOCs with a Photo ionization detector (PID) or Flame ionization detector (FID) supplied with the proper lamp, and record in the sample log. 6. Measure depth to water to nearest 0.01 feet. Measure twice for confirmation. Measurements should ' be within 0.01 feet or remeasure. DO NOT MEASURE TOTAL DEPTH AT THIS TIME. 7. Check the previous sample log for well depth. Use the information to calculate the volume of the water in the monitoring well or the volume of one casing. Record this information on the groundwater-sampling log. Pug and Sampling Activities Tubing will be dedicated to each well. Tubing will be cut to reach midway in the screened interval or to the zone of known contamination when tubing is connected to the pump. It will either remain in the hole at the appropriate depth (if disconnected from a peristaltic pump at the surface) or pulled out with the non-dedicated submersible pump, disconnected, reinserted and hung back in the hole at the appropriate depth, or coiled and stored in a zippered plastic bag labeled with site and well I.D. for the next sampling event. 1. Non-dedicated submersible system — Slowly (so as not to disturb sediment or stir up the water in the well) lower the pump and tubing down into the monitoring well until the location of the pump intake is set at a pre-determined location within the screen interval. Refer to the construction diagram to �' 2