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The distribution of replicaIe samples is lisled in lable 2. The type of replicate sample is based on design considerations. As data collection started, concentration ranges for general chemical constilU- enls, nutrients, organic carbon, and trace elements were determined for each site. Siles within the network were compared and Ihen categon7.ed as low, medium, or high based on measured concenlrations. Discharge ranges for each sile were defined as low (base flow), medium (flows above base to aboul 50 percent of the peak), and high (flows greater thaTI aboul 50 percent of the peak). The distribution of quality-control samples was monitored and adjusted during the data-collection phase of the project, producing a dynamic program design. Additional samples of ntedium- and high-flow conditions were needed to balance Ihe overall distribution. The dislribution of field-blank samples and information for the site sampled before the blank was processed are listed in table 3. Some field blanks were processed using equipment that had been cleaned in the office laboratory. To test the efficiency of the field cleaning protocol, additional field-blank samples should be collected following field cleaning rather than laboratory cleaning. Results of the qualily-control sampling listed in lables 2 and 3 are presented in the following sections of this report. Replicate Samples Replicate samples provide an indication of the magnitude and source of variability in s"mple results. Each type of replicate sample addresses Table 2. Distribution of replicate samples 1--, no ~ample) Concentration range 1 Discharge2 Type of Site Land General Dissolved Suspended name use chemical Nutrients organic organic Trace range for replicate elements sample sample constituents carbon carbon State Line Mixed m m rn h t Concurrent and pll~t-proce...sing sp1ir Cameo Mixed m m m h Concurrent and pOst-processing split DOlsero Mixed m m m I Sequentiul Gunnison Mixed m m m m , Pre-processing split near Grand Junctiun Gunnison Mixed m h Po:;;\-proce~sing split Tunnel reference) Gunnison at Mixed m m h Concurrent and pos[-proce~sing split 32 Road Easl Rural urban. I Concurrent and post-proce~sing split recreation h Concurrent tUld post~processillg split Gor~ Rural urban, m m m I Pre.proce......ing split recreation I Concurrent and post-processing split Uncomp~lhgre- Mining In I I m I I Pre-processing split French Mining I I I rn h I Pre-processing spli! Reed A!,'riculture h h h h m Sequel\lial Dr~ A.grku\\ure h h h h m Prt:--processing split Dry Fork Reference. h I h m Pre.processing split cp' Baker Reference, m Concurrenl and post.processing split sml'~' Sequential m Pre-processing split IConcentrnrj(lr! ~.1.'1ge~ with ie5jJ6:.t ill aii sites Within tile surface-water nelwork.] =: low. m =: medium, 11 = high. !Discharge ranges, J =: bast' now. m::: nows above base to about 50 percent of the peak. h =: flows greater than aoout 50 percent o( (he peak. .'Downslream from major reservoir system. ~Ph}"sjographic province. cp = ColorJdo PlateJu. snn = Southern Rocky Mountain. 4 Interim Results of Quality.Control Sampling of Surface Water for the Upper COlorado River National Water.Quality Assessment Study Unit, Water Years 1995-96