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• NATURAL SPRING MONITORING <br />Two natural springs, SWl and SW2, located over previously ittined areas itt the Southwest Mining District <br />required monitoring during 1999. Quarterly flow, field parameter, and water quality samples are required for <br />these sites. All required monitoring was completed during 1999. Tables 62 and 63 provide summaries of data <br />collected at these sites during the year. No unusual water quality characteristics are apparent. No Flow at site <br />SWI was observed during 1999. SWI Flows typically occurred throughout the year prior to mining. SW2 <br />exhibited flows through the spring and summer of the 1999 Water Year. SW2 flows were historically sporadic <br />during the period prior [o mining. TCC will continue to monitor these locations. <br />One natural spring (20-1 A) located in the vicinity of proposed future underground mining areas required semi- <br />annual flow/field parameter attd water quality sampling during 1999. Monitoring requirements were met at this <br />site in 1999. No flows were recorded during 1999. Monitoring at the site was initiated in 1987 and flows have <br />historically been minor (see Figure 122). Conductivities historically exhibited by the spring are presented as <br />Figure 123. A statistical water quality summary for [he site is presented as Table 57a. <br />SPOIL SPRING MONITORING <br />• Two spoil spring sites, 7 and the 303 series, require monitoring under the approved program at TCC. Spoil <br />spring 7 is monitored in accordance with the approved spoil spring monitoring program. The spoil spring <br />monitoring program was initiated in 1986 and is conducted annually. In accordance with the approved plan, [he <br />annual mine wide survey is conducted during May with springs measured for Flow and field parameters. If a <br />spring is discharging at or above 3~ gallons per minute, i[ is monitored for the next year in accordance with the <br />monitoring plan. <br />During the 1999 Water Year, spoil spring 7 flow was not measured in excess of 35 gpm and consequently <br />additional monitoring requirements were not triggered. Quarterly Flow and field parameter data along with semi- <br />annual water quality sampling is required from this site in addition [o the spoil spring monitoring requirements. <br />As no flow was observed at this location during the 1999 Water Year, no measurements or parameters could be <br />obtained. 1999 Water Year data for this site is presented as Table 58. A statistical water qualit}• sutnmary for [he <br />site is presented as Table i8a. <br />The 303 series spoil springs require monitoring on asemi-annual basis for flows, field parameters, and water <br />quality samples. Water quality samples for these sites, historically, have been obtained from composite site 87-I. <br />Tables ~9 through 61 provide summaries of the 1999 Water Year data collected at each 303 series spoil spring. <br />Table 59a provides a period of record statistical summary of collected data at site composite 87-I. Figure 124 <br />provides a graphical representation of period of record field conductivity for spoil spring 303-1. <br />• <br />-10 <br />