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2) Mesaverde, and 3) surface water related. <br />Mancos Shale Water Tvne <br />Wells and springs OW-4L, OW-8, OW-9, SP-2, and SP-3, are all high <br />in calcium and or magnesium and sulfate and in the case of OW-8, <br />bicarbonate and sulfate. with the exception of OW-8, total <br />dissolved solids range from 4000 to over 6000 mg/1. As can be seen <br />in Figure 3.3-12, these wells plot within the same area of the <br />trilinear diagram. The water chemistry of this group is typical of <br />Mancos ground water found elsewhere in Colorado. OW-10 is more <br />similar to group number 3, suggesting it is receiving water which <br />has not yet been in significant contact with the Mancos Formation. <br />Mesaverde Water Type <br />Without exception, all Mesaverde monitoring sites plot within a <br />limited area on Figure 3.3-12. All water from these sites are of <br />a sodium-bicarbonate water type. Total dissolved solids range from <br />575 to 1340 mg/1. This water type and range of concentrations are <br />very similar to analyses from the same geologic units taken from <br />other locations along this structure and stratigraphic sequence <br />(Snowmass Coal-CMLRD Application, 1982). <br />Well OW-4 does not clearly plot within any single water type. <br />However, since it is a sodium-bicarbonate water with a TDS of 920 <br />mg/1, it more closely resembles water from the Mesaverde group than <br />the surface-related group. It probably represents shallow ground <br />water which has been more extensively degraded by the colluvial <br />sediments than at other colluvial monitoring sites. This is due to <br />either longer transit time or possibly mixing with bedrock ground <br />water. <br />Surface Water Related Water Type <br />• Wells in the surface water related group represent a variety of <br />NCBC - Coal Ridge #1 3-29 ]18C/1145/900301 <br />