8277

• UCREFRP Catalog Number: 8277
• Author: Bauch, N. J. and N. E. Spahr.
• Title: Pesticides in Surface Waters of the Upper Colorado River Basin, Colorado, 1996-98.
• USFW Year: 2000.
• USFW - Doc Type: Water-Resources Investigations Report 00-4005,
• Copyright Material: NO

Table 10. Summary of pesticide occurrence and concentrations for all 44 surface-water sites sampled in the UCOL study unit, October 1996 through January 1998
and May 1998-Continued
[_>, greater than or equal to; µg/L, micrograms per liter; M12L, method reporting limit, <, less than; E, estimated; --, method reporting limit greater than detection threshold; HPLC,
high-performance liquid
chromatography]
Percentage Percentage Concentration at indicated percentile Maximum
Pesticide Number
of Number of Percentage detected detected MRL (µ9L) concentration
samples detections detected
' >0.01 >_0.05 (µ9L) 10th 25th 50th 75th 90th (µg/L)
\ - (µ9L) (µ9L)
Prometon 100 2 2.0 -- 1.0 0.018 <0.018 <0.018 <0.018 <0.018 <0.018 0.399
Bentazon 98 1 1.0 1.0 1.0 0.014 <0.014 <0.014 <0.014 <0.014 <0.014 E 2.60
Bromoxynil 99 1 1.0 1.0 1.0 0.035 <0.035 <0.035 <0.035 <0.035 <0.035 0.090
MCPB 99 1 1.0 1.0 1.0 0.035 <0.035 <0.035 <0.035 <0.14 <0.14 0.22
10.14
Oryzalin 98 1 LO 1.0 0.0 0.019 <0.019 <0.019 <0.019 <0.31 <0.31 E 0.030
10.31
Phorate 100 1 1.0 0.0 0.0 0.002 <0.002 <0.002 <0.002 <0.002 <0.002 E 0.003
Pronamide 100 1 1.0 1.0 0.0 0.003 <0.003 <0.003 <0.003 <0.003 <0.003 0.012
1 New reporting level for constituent, effective 12/15/97 (National Rater Quality Laboratory, 1998)
N
N