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Last modified
1/26/2010 2:19:19 PM
Creation date
10/12/2006 1:10:30 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8273.300
Description
Colorado River Basin Salinity Control - Federal Agency Reports - USGS
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1997
Author
USGS
Title
Interim Results of Quality-Control Sampling of Surface Water for the Upper Colorado River National Water - Quality Assessment Study Unit - Water Years 1995-96
Water Supply Pro - Doc Type
Report/Study
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<br />Table 1. Water-quality monitoring sites in the Upper Colorado River study unit <br /> <br />o <br />-..l <br />en <br />00 <br /> <br />Site number <br />in figure 1 <br />I <br /> <br />Site <br />name <br />Coluwdo Ri....er near Colorado-Utah State line <br />Colorado River near Cameo <br />Colorado River near Dotsero <br />Gunnison River near Grand Junclion <br />Gunni5.on River below Gunnison Tunnel <br />Gunnison River at County Road 32 <br />East River below Cement Creek. <br />Gore Creek at mouth <br />Uncompahgre RIVt'.T near Ridgway <br />French Gulch near Breckenridge <br />Reed Wash near Mack <br />Dry Creek al Begonia Road <br />Dry Fork al upper station near DeBcque <br />Colorado River below Baker Gulch <br /> <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />II <br />12 <br />\3 <br />14 <br /> <br />Purpose and Scope <br /> <br />The objectives of this report are to (I) describe <br />what factors were considered in the initial quality- <br />assurance sample design; (2) present and describe <br />quality-control data for water years 1995-96; <br />(3) analyze the quality-control data for systematic <br />problems that can be resolved in water year 1997; <br />and (4) provide insight into operalion of the network <br />for the remainder of the dala-collection phase of the <br />VeOL study unil. <br />Several types of quality-control samples were <br />collected during water years 1995-96 and included <br />pre-processing split replicates, concurrent replicates, <br />sequential replicales, post-processing split replicates, <br />and field blanks. Pre-processing splil-replicate <br />samples are samples in which twice Ihe normal <br />volume of water is collected and then split into two <br />unique samples before processing. Concurrenl- <br />replicate samples are samples that are collected using <br />two sampling teams or two sets of sampling equip- <br />ment at the same time. Sequential-replicate samples <br />are collected sequentially: first one sample is collected <br />and then a replicate is collected. Posl-processing split <br />replicates are samples thai are split after all processing <br />has been com pIe led but prior to shipment to the labo- <br />ratory for analysis. A field blank is a sample prepared <br />using blank water (water that is free of the analytes of <br />interest), which is passed through all of the sampling <br />and processing equipment. <br /> <br />Site name used <br />in this report <br />Stale Line <br />Cameo <br />Dotsero <br />Gunnison near Grand Junction <br />Gunnison Tunnel <br />Gunnison at 32 Road <br />East <br />Gore <br />Uncompahgre <br />French <br />Reed <br />Dry <br />Dry Fork <br />Baker <br /> <br />USGS 618110n <br />identifier <br />09163500 <br />09095500 <br />09070500 <br />09152500 <br />09 i 28000 <br />383103106594200 <br />09112200 <br />09066510 <br />09146200 <br />09046530 <br />09153290 <br />09149480 <br />09095300 <br />09010500 <br /> <br />Acknowledgments <br /> <br />The authors would like to express thanks <br />to Jeff Foster, Dave Hartle, and Dennis Smits for <br />dala colleclion and processing. Dave Mueller and <br />Terry Schertz provided exceptional technical review <br />of the manuscript. Thanks also are extended to <br />Joy Monson (manuscript and layout), Sharon Powers <br />(illustrations), and Hyla Strickland (editorial review). <br /> <br />QUALITY-CONTROL <br />SAMPLING PROGRAM <br /> <br />When surface-water sampling began in the <br />tlCOL network, limited information was available <br />to design Ihe quality-control sampling program. <br />In the initial and continuously developing quality- <br />control design, several factors were considered, which <br />included streamflow. expected constituent concentra- <br />tions, basin characteristics, land use. and whether vari- <br />ability or bias would be important at a site. Variabilily <br />is the degree of random error in independent measure- <br />ments of the same quantily. Replicate samples test for <br />variability, which could be important at sites that have <br />high constituent concentrations. Bias is the systematic <br />error inherent in a method. Blank samples test for bias, <br />which could be more imponant at sites having low <br />constituent concentrations. <br /> <br />QUALITY-CONTROL SAMPLING PROGRAM 3 <br />
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