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TABLE 6 <br />COMPARISON OF TDS 'lALUES FOR NUCLA EAST WELLS <br />ANG SELECT NUCLA EAST PIEZOMETERS, 1986-1989 <br />Aquifer #Obs. Mean Std. Dev. Min Max Well Type <br />Overburden <br /> GW-N15,1B,18P1,21 <br /> April - Nov, 18 4099.7 2684.9 778 10,074 4" <br /> Nov. - April 11 3871.6 1578.9 2526 6,910 4" <br /> <br />CW-N31 <br />'I <br />3136.0 <br />- <br />- <br />- J <br />iS~~I (t'. V <br />2" <br /> Y'N la n <br />g~ ' 7,3~ J, <br />~ <br /> GW-M36 T~S I 2100.0 - - - 2" <br /> ~9a a+s~ ,~ sta\4~. tiv <br /> Dakota Coal <br /> CW-N14,17P1,20 <br /> April - Nov. 18 3128.3 1043.8 1824 4,456 4" <br /> Nov, - April 11 2776.7 1188.8 1514 4,550 4" <br /> G'd-N29 1 5252.0 - - - 2" <br /> GW-N30 1 1340.0 - - - 2" <br />Underbur den <br />GW-N13,16,19 <br />April - Nov. 18 1779.6 749.5 950 2,812 4" <br />Nov. - April 11 1638.2 733.2 1050 2,866 4" <br />GW-N34 1~t 1 1788.0 - - - 2" <br />N'«*J IAyM\1C1~ ~~i <br />TDS = Total Dissolved Solids (mg/1) (~' 180° <br />April - Nov.: April 14 - November 1 (irrigation season) <br />Nov. - April: November 1 - April 14 (non-irrigation season) <br />Note: This table represents statistical TDS data for Nucla East 4-inch wells and select <br />Nucla East 2-inch piezome to rs. Data for the wells includes all historic seasonal <br />TDS data from 1986 to present. Data for the piezometers includes TDS data <br />collected during special water quality 5ampli ng conducted on May 16-17, 1989. <br />Pie zometers GW-N35 and GW-N38 were also sampled during May 1989; however, their <br />analyses were rejected for this comparison due to probable deficiencies in their <br />well development and/or residual completion effects. <br />17 <br />