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<br />Maitland Arroyo SW-1 T27S, R67W, Sec 36, SW#, NW# <br />Tributary to Maitland SW-2 T27S, R67W, Sec 36, NW#, SW# <br />Arroyo <br />Maitland Arroyo SW-3 T27S, R67W, Sec 25, SE#, SE# <br />Gordon Arroyo SW-4 T27S, R67W, Sec 25, NW#, NW# <br />Gordon Arroyo SW-5 T27S, R67W, Sec 25, NW#, NW# <br />As previously mentioned, during the 20 months of monitoring, no <br />surface flows have been observed in either of the arroyos (Table 1). In addition, <br />only one low flow event wes recorded on the crest gage stations over the <br />monitoring period. <br />GROUND WATER HYDROLOGY <br />Piezometer depths and locations were chosen to obtain an appreciation <br />of natural ground water conditions in a variety of water-bearing units to evaluate <br />• the degree of connection between the abandoned and flooded underground mines <br />and to permit a sampling of representative ground waters for chemical analysis. <br />Most installations were located along the western mining limit thereby allowing <br />long term monitoring of the ground water flow system and the effects of the <br />proposed mining activities. <br />Methods <br />A total of 46 sealed piezometers were installed at 22 sites throughout <br />the permit area in order to further monitor and evaluate ground water flow and <br />chemistry. Depths and locations of all piezometers are summarized in Table 2 and <br />shown on Figure 1. Each piezometer consists of a one-inch ID PVC pipe installed in <br />a 4-3/4 inch diameter drillhole. The lowest 10 feet of the PVC pipe was slotted <br />and a cap placed on the bottom. A coarse sand pack of approximately 10 to 15 feet <br />in length wes placed around the piezometer tip and a seal of bentonite pellets <br />• <br />-4- <br />