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Baseline Hydrologic Monitoring Plan — Hansen Project 42 <br />Table 14. Groundwater Monitoring Frequency <br />QUARTER <br />MONTHS <br />WATER <br />WATER <br />LEVELS <br />QUALITY <br />January <br />1 st Qtr (Winter) <br />February <br />✓ <br />✓ <br />March <br />April <br />2nd Qtr (Spring) <br />May <br />✓ <br />✓ <br />June <br />July <br />3rd Qtr (Summer) <br />August <br />✓ <br />✓ <br />September <br />October <br />4th Qtr (Fall) <br />November <br />✓ <br />✓ <br />December <br />4.5 Groundwater Monitoring Procedures <br />Groundwater sample collection, sample handling, laboratory analysis, and field data collection are <br />conducted in accordance with strict environmental protocols for water quality sampling. SOPS for baseline <br />water quality monitoring have been developed in accordance with best practices for ensuring precision, <br />accuracy, reliability, and repeatability of the data collected. <br />All instruments will be decontaminated and calibrated according to manufactures specifications at the <br />frequency specified in the QAPP (Appendix G). Calibration procedures are provided in Appendix A. <br />Sample collection containers and filtration receptacles will be thoroughly decontaminated prior to use at <br />each well according to decontamination procedures provided in in Appendix B and ASTM specification D <br />5008 -90. <br />A general site inspection will be performed upon arrival at each monitoring well and comments regarding <br />site conditions will be recorded on the field sampling sheet. Depth to water will be measured to the nearest <br />one - hundredth of a foot from the top of the well- casing using an electrical water level sounder, before <br />purging and sampling the well. The water level sounder should be cleaned with an environmental grade <br />detergent (Alquinox®, Liquinox®, or equivalent) before entering the field. All parts of the sounder that <br />will contact groundwater should be rinsed with distilled water before placement in the well. <br />Groundwater purging and sampling are performed according to the SOPs provided in Appendix F. <br />Monitoring wells will be sampled using either conventional purge techniques (i.e. PVC, steel, or teflon <br />bailer), low -flow micropurging techniques (e.g., dedicated bladder pumps), or passive sampling techniques <br />(e.g. Hydrasleeve®, etc.) For conventional purging, a minimum of three well volumes will be purged <br />before collecting the sample. The pH, specific conductance, and temperature of discharged water will be <br />monitored during purging and recorded on the field sampling record. Well purging will be sufficient when <br />at least three volumes have been purged, the water is clear without visible turbidity, and successive <br />measurements for field parameters vary by less than 10 percent. For very low volume wells, the wells may <br />be pumped or bailed dry and allowed to recover overnight before collecting the sample. In this case, <br />purging of a minimum of three well volumes would not be required. Dedicated sampling pumps and low <br />flow (micro - purge) sampling methods or no -purge passive sampling methods may also be used to collect <br />groundwater samples. Protocols for low flow sampling and passive sampling are also provided in <br />Appendix F. <br />4153A.140129 Whetstone Associates <br />