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PART C <br />GROUND -WATER SAMPLING PROCEDURES <br />Permit Section 4.8.5.2 presents Trapper's ground -water monitoring program. Table 4.8 -13a shows the <br />ground -water monitoring schedule, while Table 4.8 -13 lists the ground -water quality parameters to be <br />monitored. The following discussion provides the guidelines to be followed to obtain required ground -water <br />information. <br />Water -Level Measurements <br />A. The static water level for all wells will be measured prior to sampling with the exception of <br />well GD -1(2) because this well is pumped routinely for operational use. Static water -level <br />readings are converted to feet above mean sea level by using the elevation of the <br />measuring point. <br />B. Some of the wells at the Trapper site are flowing wells. The shut -in static pressure is used <br />to obtain the static water -level elevation for these sites. The pressure is converted into <br />feet of water above the measuring point and added to the measuring point elevation to <br />obtain the static water -level elevation. <br />Monitoring <br />A. Site measurements of temperature, pH and specific conductance (SPCO) are taken at <br />each site during the sampling of the well. Since these measurements are taken at the well <br />head there is no holding time for sample analysis. The field parameters that were <br />measured just prior to collecting the sample are used along with laboratory analysis for a <br />particular well. <br />B. A pump volume of a minimum of three casing volumes will be produced from each well <br />except in poor producing wells where samples are taken after the field parameters are <br />stable. If bail samples have to be used, the bailer will be rinsed with distilled water, <br />samples will be collected from the casing perforated interval and the first bail volume will be <br />discarded. <br />C. After field measurements are taken and the proper volume of water is produced from the <br />well, samples are taken from the discharge stream. The samples obtained for lab analysis <br />parameters are outlined in Table 4.8 -13. <br />Samples are refrigerated until shipped to the lab. During shipment, samples are iced and <br />held in coolers. In order to meet the recommended EPA holding times, samples must be <br />received within 24 hours of the time that the samples were taken. <br />Guidelines, as outlined by the lab, are followed as to the number of bottles to be filled, <br />samples to be preserved, storage, etc. Chain of Custody forms, provided by the lab, are <br />filled out and handling instructions are followed. <br />III. Monitoring Equipment <br />See Appendix Q, XXXI, Part A for discussion of the monitoring equipment to be used. <br />IV. Sampling Schedule <br />The wells at the Trapper site will be sampled for water quality parameters during the second and <br />third quarter of each year. Water levels will be measured on a quarterly basis. Only static water <br />levels are done during the first and fourth quarters. <br />GCR 11/12 <br />[Permit Revisions \TR- 110\APP -Q31] <br />�,,, IR W3 <br />