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TMWRF Water Quality Analytical Procedures

This document summarizes the analytical methods used by TMWRF over the past 20 years.

Truckee River miles

This document lists the TMWRF River collection sites and river miles from Mogul to Nixon.

Pyramid Lake Paiute Indian Tribe Nonpoint Source Assessment and Management Plan

Load Duration Curve Methodology for Assessment and TMDL Development Nevada Division of Environmental Protection

The major streams in Nevada have had TMDLs (Total Maximum Daily Loads) established for several years. However for some of these streams, the TMDLs are expressed as an average daily load based upon average long term flow conditions. These TMDLs have been dubbed as "bare bones" TMDLs due to the simplicity of the calculation and their lack of usefulness. While these TMDLs seem to satisfy the requirements of the Clean Water Act, they have contributed little to any watershed/waterbody assessment and restoration plans. These types of TMDLs do little to characterize the problems the TMDLs are intended to address. Without adequate characterizations, appropriate solutions cannot be identified and implemented.

Evaluation of Groundwater and Solute Transport in the Fernley – Wadsworth Area

The Truckee River Water Quality Agreement of 1997 settled longstanding litigation between the Pyramid Lake Paiute Tribe (PLPT) and the U.S. Environmental Protection Agency (EPA), State of Nevada and the Cities of Reno and Sparks (“Cities”), respectively. A key element of this agreement was a commitment by the Cities and the Department of the Interior to spend up to $24 million to purchase Truckee River water rights from downstream of Sparks. Water would subsequently be sorted in upper basin reservoirs for release under low-flow conditions to help the Cities meet water quality objectives, particularly those related to nutrients and dissolved oxygen. It was further anticipated that a reduction in irrigated agriculture within the Fernley area would result in an associated decrease in high total dissolved solids (TDS) groundwater discharge to the river, helping to mitigate salinity loading to Pyramid Lake.

A hydrogeologic investigation was undertaken to characterize the groundwater system in the Fernley Basin and to determine the TDS loading to the Truckee River between the towns of Wadsworth and Nixon. A groundwater flow and transport model was constructed to integrate all of the available data and to predict the potential loadings under various management alternatives.

Biological Condition Index Development for the Lower Truckee River and Eastern Sierra Nevada Rivers: Fish Assemblage

Written By

Robert M. Hughes and Thomas R. Whittier
Department of Fisheries and Wildlife
Oregon State University
200 SW 35th Street
Corvallis, Oregon 97333
Gregg A. Lomnicky
Dynamac Corporation
200 SW 35th Street
Corvallis, Oregon 97333

Prepared For
Pyramid Lake Paiute Tribe
Nevada Division of Environmental Protection
April 2005
We developed a fish assemblage IBI for western Nevada rivers and applied it to the Truckee River. Available state and federal fish assemblage data from the Carson, Walker, and upper Truckee rivers were analyzed to select and score metrics. Selected metrics included number of native species, % sculpin individuals, % mountain whitefish individuals, evidence of sculpin and whitefish reproduction, % cutthroat trout individuals, % sensitive individuals, % mountain sucker individuals, % omnivorous individuals, % highly tolerant individuals, % alien individuals, and % external anomalies. Metrics were scored continuously from 0-1 and the IBI was scored from 0-10 by summing the metrics. Those metrics and scoring criteria were then applied to existing fish assemblage data for the lower Truckee River. The IBI declined from the Nevada border to Wadsworth, with sharp declines at river miles 57 (Oxbow), 69 (Mustang), and 87 (Painted Rock). Revisits to the same sites indicated that IBI scores may vary by 1.0 as a result of temporal and sampling variation. We consider median IBI scores >7.5 as acceptable, 5.0-7.4 as marginally damaged, and <5.0 as damaged. However, these are only guidelines and 2.0 changes in IBI scores over space or time are probably biologically significant.

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