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' APPENDIX I <br /> GROUNDWATER SAMPLING PROCEDURES <br />' Groundwater monitoring wells will not be sampled until at least <br /> 72 hours after well development . Groundwater samples will be <br /> obtained using either a bladder pump, clear Teflon bailer, or <br /> dedicated polyethylene bailer. Prior to collecting samples , the <br /> sampling equipment will be thoroughly decontaminated to prevent <br />' introduction of contaminants into the well and to avoid cross- <br /> contamination. Monitoring wells will be sampled after 4 to 10 <br /> wetted casing volumes of groundwater have been evacuated and pH, <br /> electrical conductivity, and temperature have stabilized as <br />' measured with a Hydac Digital Tester If the well is emptied <br /> before 4 }o 10 well volumes are removed, the sample will be taken <br /> when the water level in the well recovers to 80% of its initial <br />' water leve' or more. Degree of turbidity will be measured and <br /> recorded in nephelometric turbidity units (NTU) . <br /> TPE will also measure the thickness of any floating product in <br /> the nonitoi2ng wells using a probe, clear Teflon, or polyethylene <br /> bailer. Ths floating product will be measured after well <br /> development but prior to the collection of groundwater samples. <br />' If floating product is present in the well , TPE will recommend to <br /> the client that product removal be commenced immediately and <br /> reported to the appropriate regulatory agency <br /> Unless specifically waived or changed by the local , prevailing <br /> regulatory agency, water samples shall be handled and preserved <br /> according to the latest EPA methods as described in the Federal <br />' Register (Volume 44 , No . 233 , Page 69544 , Table 11) for the type <br /> of analysis to be performed . <br />' MEASUREMENTS <br /> Purged Water Parameter . During purging, discharged water will be <br />' measured for the following parameters. <br /> Parameter Units of Measurement <br />' pH None <br /> Electrical Conductivity Micromhos <br /> Temperature Degrees F or C <br />' Depth to Water Feet/Tenths <br /> Volume of Water Discharged Gallons <br /> Turbidity NTU <br />' Documentation- All parameter measurements shall be documented in <br /> writing on 'CPE development logs <br /> I <br />