Laserfiche WebLink
iii iiiiiiiiiiiii iii <br />999 <br />Doc Date:12/11/2001 <br /> <br />\ 3.0 GROUND-WATER DUALITY <br /> Appendix B presents the ground-water quality data for <br /> Trapper Mine. Table 8-1 tabulates the available ground-water <br /> quality data for Trapper monitoring wells. Total dissolved <br /> solids (TDS) and field conductivity were selected as the <br /> parameters to discuss trends of major constituents. <br /> 3.1 TDS <br /> TDS is a measurement of the total dissolved minerals in <br /> water. It typically correlates well to constituents which make <br /> up the majority of the dissolved solids and therefore, is a good <br /> indicator of trends for the constituents. Conductivity is <br /> typically a good indicator of TDS and in turn a good indicator of <br /> some major constituents. The first series of pages, in Table B-1 <br />• it <br />f A <br />di <br />B <br />f <br />h <br />ll <br />t <br />th <br />TDS <br />d <br />ti <br />d <br /> v <br />y an <br />o <br />ppen <br />x <br />, <br />or eac <br />we <br />presen <br />s <br />e <br />, con <br />uc <br /> sum of major constituents (DSSUM) along with. several other <br /> parameters. DSSUM was calculated by adding the concentrations of <br /> major cations and the major anions, except for one-half of the i <br /> bicarbonate which is not added because this concentration is <br /> evaporated during the measurement of TDS. This allows a <br /> comparison of TDS and DSSUM, which is a good check on the TDS and <br /> major constituent measurements. The second series of parameters <br /> presented in Table B-1 includes values of the charge balance <br /> (BALNC) of the major constituents. BALNC is calculated as the <br /> difference of the cations to anions in meq/1 divided by their sum <br /> times 100. BALNC is also a good indicator of accuracy of major <br /> constituents and values between -10 and 10 are considered good. <br /> Figure B-1 of Appendix B presents the TDS plot for well GA1. <br />3-1 <br />