Flint Creek TMDL Study
This document constitutes the Sampling and Analysis Plan (SAP) for the completion of a nutrient and metals source assessments and loading estimates for the listed streams in the Flint Creek TMDL planning area (TPA). This SAP falls under project guidance provided in the Flint Creek TMDL Project plan CO2-TMDL-01. Flint Creek is located in the Pend Oreille River Basin (Accounting Unit 170102). The creek is a tributary of the Clark Fork River and drains an area of approximately 500 square miles. The watershed is located in the Middle Rockies Level III Ecoregion. Flint Creek drains from Georgetown Lake to the Clark Fork River near Drummond. The TMDL planning area includes portions of Granite and Deer Lodge counties and two valleys: The Philipsburg and Drummond valleys. These valleys are separated by a narrow bedrock canyon. Flow in Flint Creek is augmented by inter-basin diversion from East Fork Rock Creek. Upper and Lower Flint, South Fork Lower Willow, Barnes, NF Douglas, Boulder, Camp, Douglas (near Philipsburg) and Fred Burr Creeks are identified for various metals related impairments on Montana’s 2006 impaired waters list (Figure 1). Metals sources include natural, historic mining activities and a couple active mines. Barnes, Lower Flint, NF Douglas, Smart and Douglas Creek (near Hall) are identified for various metals related impairments on Montana’s 2006 impaired waters list (Figure 1). Nutrient sources include natural, mining and various agricultural related sources.
The objective of this sampling plan is to collect chemistry and chlorophyll data, in conjunction with field parameters, that will be used for the following:
• Verification of nutrient and metals impairment conditions on 303(d) listed tributaries in the Flint Creek TMDL Planning Area to aid in TMDL development decisions
• Quantification of nutrient and metals loads associated with specific land use categories in the Flint Creek TMDL Planning Area to assist in TMDL nutrient and metals load allocations
Water Quality monitoring was completed during 2007 and 2008. This effort builds upon the prior data set from the past two years. In order to meet the above objectives, nutrient and metals conditions will be determined by extensive water quality sampling in the listed tributaries within the Flint Creek watershed. Synoptic surveys for nitrogen and phosphorus compounds in the water column will be performed at each of the selected sample sites during two sampling events: one in spring and one in summer of 2009 (Table 2, Appendix A). Chlorophyll a sampling will be competed in conjunction with nutrient sampling during the summer sampling effort. Synoptic surveys for key metals concentrations in the water column will be performed at each of the selected sample sites during both spring and summer 2009. Total suspended solids will be collected at all sample sites where water column parameters are collected. Physical parameters (i.e. water temperature, dissolved oxygen, pH, and conductivity) will be collected with a field meter at all sites. The contractor and DEQ will review available results of the spring sampling prior to the low flow sampling effort and adaptively manage sampling efforts for low flow monitoring.
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