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WSP09923
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Last modified
1/26/2010 2:56:32 PM
Creation date
10/12/2006 4:01:35 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8102
Description
Arkansas River Basin Basic Hydrology
State
CO
Basin
Arkansas
Water Division
2
Date
1/1/1997
Author
USGS
Title
St Charles Mesa and La Junta Publications
Water Supply Pro - Doc Type
Publication
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<br /> <br />1(W34' <br /> <br />38016' <br /> <br />"2 <br /> <br />iii ..11 ill <br />;.911 <br /> <br />/ <br />/0; <br />/ ~ <br />/- /) ~ <br />o <br />" <br /> <br /> . <br /> c <br /> 0 <br />s. ~ <br />~ '0' <br /> M <br /> N )' <br />7' <br />.3 ".16 <br /> ." <br />5': <br /> <br />( <br />I <br />I <br />I <br />\ <br />\ <br />\ <br /> <br />3B014' <br /> <br />, <br />"- <br />Bessemer Dilch <br /> <br />'. <br /> <br /> <br />- <br /> <br />~DePthtowaterlessthan5faet <br />?' Depth 10 water between 5 and 10 feet <br />t... Depth 10 water between 10and 15 feet <br />JDepth to water greater than 15 feet <br />. Nilrate less Ihan 3mg/L (8wellsl <br />. Nitrate from 3 to 7 mg!L (13 wells) <br />. Nitrate between 7 and 10 mg!L (4 wells) <br />25 Wall number <br /> <br />104030' <br /> <br />. <br /> <br />-. -..- <br /> <br />...,.. -- <br /> <br />"3 <br /> <br />E'yeren Road <br />'" <br /> <br />\ <br />~ \ <br />~ \ <br />;51 <br />I <br />/ <br />/ <br />/ <br />/ <br />/ <br />/ <br /> <br />.22 <br /> <br />. <br />x <br />o <br />'" <br /> <br />2~. Gale Road <br /> <br />Silnta Fe'Oriye <br /> <br />.21 <br /> <br />. <br />c <br />. <br />~ <br />~ <br />Ii <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Hillside Road <br /> <br /> <br />.17 <br /> <br />24. <br /> <br />County Farm Road <br /> <br />. <br />c <br />:J <br />~ <br />" <br />,-M> <br /> <br />" <br />. <br /> <br />~ <br />o. <br />~ <br />;€ <br />N South Road <br /> <br />20. ,- <br /> <br />\f;.'.:f' <br />~0~" <br />/ 0~ <br />,19 <; so. <br />,-'- . StlIdy-area boundary <br /> <br /> <br />1 MILE <br />, <br />1 KilOMETER <br /> <br />Figure 3. Nitrate concentrations in wells sampled on Sl. Charles Mesa during July and August 1997. <br /> <br />. <br /> <br />presence of bacteria in the ground water may be due in <br />part to the coarseness of the subsoil material and the rate at <br />which recharging water containing bacteria, whether <br />precipitation. canal diversions, or septic-system efftuent, <br />can Ilow to the water table. The detections of total <br />coliform bacteria do not necessarily indicate that septic- <br />system effluent has degraded ground-water quality <br />because total coliform bacteria can originate from animal <br />fecal matter and soil organisms. The detections of E. coli <br />in two wells indicate degradation of the ground water by <br />fecal matter at those locations, but whether the source was <br />septic-system cfftuenl or animal waste cannot be differen- <br />tiated in these samples. <br />Caffeine was detected in one sample, which <br />contained 0.28 microgram per liter (Ilg/L) (table 2). There <br />is no USEPA maximum contaminant level for caffeine. <br />The expected maximum background concentration for <br />caffeine was set at 0.04Ilg/L, the detection limit of the <br />method of analysis (table I). The presence of caffeine in <br />the sample from well 7 may indicate septic-system <br />contamination of ground water in the vicinity of the well <br />because septic-system efftuent is the only source of <br /> <br />caffeine to the ground water. However, the single detec- <br />tion of caffeine indicates that either caffeine is not gener- <br />ally present in the ground water or, if caffeine is present, <br />concentrations are decreased through chemical or biolog- <br />ical processes. Therefore, the caffeine data do not indicate <br />widespread degradation of the ground water by septic- <br />system effluent. <br />When the concentrations of all the constituents for <br />each well are compared using the multiple-lines-of- <br />evidence approach, the data indicate that there is insuffi- <br />cient evidence to indicate a widespread presence of septic- <br />system effluent in Mesa ground water. <br />Concentrations of nitrate, MBAS, bacteria, and <br />caffeine in some ground-water samples collected from the <br />Mesa were higher than would be expected for ground <br />water that was not affected by the byproducts of human <br />practices. Detections of MBAS and caffeine indicate that <br />septic-system eftluent may be present in the ground water <br />on the Mesa. Evidence indicates that degradation of <br />ground water on the Mesa that could be associated with <br />septic-system eflluent is not widespread, but human prac- . <br />tices have affected the quality of Mesa ground water. <br /> <br />6 <br />
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