WSP05652

• 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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CONTENTS

Abstract..................................................................................,.. ...................,........................................................................ I
Inuoduction......,..... .."..............................."........."..................... ...".....................".."......"............."....... .._................_.......".."... I
Pu rpose and Scope........................................................................................................................................... ............ }
Ac know IedgmenL' ................................................................................,........ .............................,............................... }
Quality-Control Sampling Program................................... ..................................... ............................................................. }

Repl icate Samples.......................................................................................... ............................................................. 4
Pre-Processing Split Replicates .......................................................... ...................... ....................................... 6
Comparison of General Chemical Constituents ........................ ..............". .........,................................. 6
Comparison of NUlrients and Organic Carbon ........................................................................................ 9
Comparison of Trace Elenlcnts ......... .." .... ...... .,..... .... ..... ." ......" ......." ............ ............ ....... .......... ....... ..... 12
Concurrent and Sequential Replicales .... ............ ..... ..... ....... ............... ...... ........ ......... ............ ........ .............. ..... 15
Comparison of General Chemical Constituents. ......................." ........................................ .................. 15
Comparison of Nutrients and Organic Carbon ......................... ...................... ................ ......."............. 20
Post-Processing Split Replicates................................ ....................... ................ .......................................... 24
Comparison of General Chemic.1 Constituents ...................... ........................................................... 25
Comparison of Nutrients and Organic Carbon ......................." .............................................................. 28
Field Blanks... ............ ........ ......... .......... ....... ........... . ..... ..... .......... ..... "................. ............ ............ .......... ............ } I
General Chemical Constituents .. ............ ..... ..... ..... . ..... ............ ,.. ...... .. .......... ...... ... .......... ..... ..... ....... ............ 31
Nutrients and Organic Carbon .........................,................................................................................................. 32

Conclusions.... ..... ........ ..... ........... ....... ....... ........ .... ........ ...... ... ...... . ............ .... ............. ..... ......... .......... ............ ........ ..... ......... 34
References Cited ........ ................ ........................................... ........................................................................................}4

FIGURES

I. Map showing location of sampling sites...................... ........................ . .......................... .......................... 2
2-5. Graphs showing:
2. Distribution of collection of pre-processing split-replicate samples. 1995-96................................................ 6
J. Disrriburion of collection of concurrenl- and sequential-replicate samples, 1995-96..................................... 15
4. Distribution of collection of post-processing split-replicate samples, 1995-96.............................................. 25
5. Distribution of collection of field blanks, 1995-96 ........................................................ ................................ 32

TABLES
I. Water-quality monitoring sites in the Upper Colorado River study unit ............................................................... 3

2. Distribution of replicate samples....., ..... ....... .............. ....... ........ ..... ." .......... ......... .......... ..... ....... ..... ..... ....... ............ 4
3. Distribution of field-blank samples ................. ............ .............................................. ...................... 5
4. Comparison of en\'ironm~n(aJ and pre~processing split-replicate samples for general
c henliciJ I constituents.................................................................................................................... .......................... 7
5. Summary of differences between environmental and pre-processing split-replicate samples
for general chenucal constituents ............ ........ ......... ..... ... ......... ... .. .... ..... .... . .... ....... ............ .......... ...... 9
6. Comparisons of environmental and pre-processing split-replicate samples for nutrients and
organic carbon...............................,.......................... _...........,.................................................................................. 10
7. Summary of differences between environmental and pre-processing split-replicate samples
for nutrients and organic carbon.. ........................ ............................................................................ ..................... 12
8. Comparison of envirorUllenral and pre-processing split-replicate samples for trace elements ............................... 13
9. Comparison of environmental and concurrent- and sequenlial-replicate samples for general

chemical constituents .... ,. ....... ..... ... .............. ........ ......... .......... ............ .......... .......... ......... .......... . ... ....... ......... 16
10. Summary of differences between environmental and concurrenl-replic.He samples for general
chemical constituents ......... ......... ............ ,........ .... .... .......... ... ......... ........... ...... ............ ............ .. .......... ............ 20
11. Comparison of environmental and concurrent- and sequential-replicate samples for nutrients
and organic carbon ................. .................................... .................................. ..................................,........ ::! I

CONTENTS III