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CA ARNG Field Quality Assurance Project Plan <br /> • Sample truck; <br /> • Teflon®sample bailer,point source check valve and flow control bottom emptying assembly; <br /> • Plastic buckets;and <br /> a Hand reel with Teflon®coated stainless steel line or disposable monofilament line. <br /> Portable Submersible Pump Pre-Sampling Procedures <br /> 9.1.5.6 Prior to initiating well purging,all sampling equipment that may come in contact with well <br /> water are decontaminated following the procedure described in Section 9.3 of this field QAPP. Once <br /> decontamination is complete, the following steps are followed prior to purging the well. <br /> 1. Measure static water level in the well casing to determine the minimum volume of water needed to <br /> be purged from the well prior to collection of groundwater samples.Water level measurements are <br /> measured to the nearest 0.01 foot using an electronic water level sounder.Water levels are recorded <br /> on the groundwater sampling data sheet. <br /> 2. Position the purge pump reel system over the wellhead(hard hats are required for all work involving <br /> overhead equipment). <br /> 3. Attach the control converter box to the pump and power supply,and start the generator. <br /> 4. Attach a garden hose to the Port-a-Reel and place it opposite the wastewater container. To prevent <br /> siphoning, make sure that hose is not submerged in water in the wastewater container. <br /> 5. Attach the power cable to the plug on the power cable reel. Plug the power cable into the generator. <br /> 6. Remove a minimum of three times the volume of water initially standing in the well casing during <br /> purging of the well using a submersible pump; purge volume is calculated as follows: <br /> Minimum Purge Volume(gallons)—3 x V (Equation 16) <br /> V=3.142 L x 7.48 gallons/ft3; <br /> V=One wetted casing volume(gallons); <br /> R=Inside radius of casing(feet); and <br /> L=Height of water column in well(feet). <br /> The following formula can be used: <br /> Minimum purge volume=(total depth—water level)x(gallons per feet)'x 3 (Equation 17) <br /> 'Depends on casing diameter: <br /> for 2-inch well—0.163 <br /> for 4-inch well—0.65 <br /> for 6-inch well— 1.46 <br /> field QAPP.DOC 9-5 May 2000 <br />