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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 to 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 level 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 monitoring wells using a probe, clear Teflon, or polyethylene <br /> bailer. The 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 59544 , 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 /> I <br /> pH None <br /> t 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 shalllbe documented in <br /> writing on TPE development' 11o6s { II <br /> I I <br /> I I I I <br /> I <br /> �r I <br /> r <br /> I I I <br /> 'I 4 FI `Ir E1I V <br /> I <br />