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Wells that do not have extremely slow recharge rates will be purged and sampled as described <br />below. Purging will be conducted in a manner that, to the extent practical, removes all the "old" <br />water in the well so it is replaced by fresh ground water from outside the well installation. <br />Samples for laboratory analysis will be collected only after a minimum of three water-column <br />volumes have been purged. If water is not present in the well following purging, then the <br />sampler shall wait 7 days and attempt to resample. If there is insufficient water in the well after <br />the third attempt, the well shall be deemed dry for that sampling period. <br />A and C Pits <br />A and C Pits will continue to be sampled biweekly until the installation of Well 1. Following the <br />installation of Well 1, both pits will be sampled quarterly. If four consecutive quarters yield <br />results below the MCL, then sampling frequency will be reduced to annual. If annual samples <br />yield results above MCL, quarterly sampling will resume. Sampling will be discontinued in A <br />Pit once 4 consecutive annual samples yield results below MCL. Sampling in C-Pit will <br />continue until closure. If there is no accumulation of water in C-Pit to sample, CEMEX will <br />record and report this information in the quarterly report. Furthermore, CEMEX will monitor the <br />water level in C-Pit weekly and presence of wildlife in C-Pit daily. Daily wildlife monitoring <br />shall continue until the surface area of the C-Pit accumulation water is less than 3 acres. <br />Dakota Aquifer Sampling <br />CEMEX will sample the Hall Well (Permit # 24324-A) for 4 consecutive quarters in order to <br />provide regional groundwater information on the Dakota aquifer. <br />Reportine <br />CEMEX will submit all data collected from this sampling and analysis plan to the DMG for <br />review no later than 34 days after the end of each calendar quarter. Attached to this report shall <br />be copies of analysis reports and summaries of all observations. <br />