«JULY 2009 EXECUTIVE SUMMARY 1.0 INTRODUCTION 2.0 THE DELINEATION REPORT 3.0 SUSCEPTIBILITY ANALYSIS AND DETERMINATION 4.0 MANAGEMENT PLAN ...»
DRINKING WATER SOURCE PROTECTION PLAN
CENTRAL UTAH WATER CONSERVANCY DISTRICT
ASHLEY VALLEY WATER TREATMENT PLANT
Red Fleet Reservoir Watershed
2.0 THE DELINEATION REPORT
3.0 SUSCEPTIBILITY ANALYSIS AND DETERMINATION
4.0 MANAGEMENT PLAN TO CONTROL EXISTING POTENTIALCONTAMINATION SOURCES
5.0 MANAGEMENT PLAN TO CONTROL FUTURE POTENTIALCONTAMINATION SOURCES
6.0 IMPLEMENTATION SCHEDULE
7.0 RESOURCE EVALUATION
8.0 RECORD KEEPING
9.0 PUBLIC NOTIFICATION
10.0 CONTINGENCY PLAN
Figure 2. Red Fleet Reservoir Delineation Zones.
Appendix 1: Potential Contamination Source Survey.
Figure 3. UST / LUST Sites.
Appendix 2: Public Notification
3.Tr.A02.Z9.205.Drinking Water Source Protection Red Fleet Reservoir Watershed Source Protection Plan
1.1 System Information CUWCD has prepared this SPP for the purpose of protecting the raw water quality of CUWCD=s drinking water source by identifying and managing potential sources of contamination and threatening activities that occur within the watershed area. This assessment is for the Red Fleet Reservoir watershed that provides water to the CUWCD, Ashley Valley Water Treatment Plant (AVWTP) a Public Water Supplier, at 3550 North 2500 West, Vernal, Utah 84078.
AVWTP is a direct filtration water treatment plant with a design capacity of 18 MGD. The plant currently treats an average of 2.8 MGD for 9,000 customers in Vernal City and Uintah Water Conservancy District. Information on "tap" water quality is available in CUWCD Public Water Supplier=s Consumer Confidence Report that can be obtained by calling 435-789-0421.
1.2 Source Information The water source of Red Fleet Reservoir, source number 01, is classified by the State of Utah as a surface water source. This source is generally a seasonal supply (April 15 - June 15) to replace the Ashley Spring source when water quality is less desirable for treatment.
1.3 Source Protection Area The Red Fleet Reservoir watershed area is 60,850 acres in Uintah county (Figure 2). Big Brush Creek is the primary stream in the watershed which is impounded by Red Fleet Dam creating Red Fleet Reservoir. The dam is operated by Uintah Water Conservancy District for agricultural and M & I purposes in Ashley Valley. The reservoir has a surface area of 520 acres (holding 26,020 ac-ft). It is managed by Utah State Division of Parks and Recreation which maintains camping, boat launching, and recreation facilities. Approximately 65% percent of the watershed is within Ashley National Forest. Camping and other recreation activities take place within the boundaries of the watershed. Other uses include phosphate mining upstream of Red Fleet Reservoir. One major highway (U-191) crosses Big Brush Creek above Red Fleet Reservoir.
2.0 THE DELINEATION REPORT
2.1 Source Protection Zones For surface water sources, the entire watershed area that contributes water to the source is considered to be the area of concern. The watershed is further broken down into three zones, with Zone 1 being the closest to the intake (the area of most concern) and Zones 2 and 4 corresponding to areas further away and of lower concern (Figure 2).
2.2 Zone 1 Zone 1 for the Red Fleet Reservoir source, starts at Red Fleet dam and follows the creek channel northwesterly through the reservoir and extends 2 mile wide from the high water mark laterally to the extent of fifteen miles including all tributaries flowing into this creek. For detailed view of this zone refer to Figure 2.
Introduction The Central Utah Water Conservancy District (CUWCD) is completing assessments of potential contamination threats to the raw water quality of its public drinking water sources as required by the 1996 Safe Drinking Water Act and by R309-600 and 605 of the State of Utah Drinking Water regulations. CUWCD has prepared this Source Water Assessment Public Summary to provide information to its customers regarding local and State efforts to protect the raw water quality of CUWCD=s drinking water source. This assessment is for the watershed that provides water to the CUWCD Public Water Supplier. The assessment is of source (river, lake, reservoir water) rather than tap water. Information on "tap" water quality is available in CUWCD Public Water Supplier Consumer Confidence Report that can be obtained by calling 435-789-0421
What is the Source of Your Drinking Water?
The source of the water for the CUWCD is the Ashley Spring and Red Fleet Reservoir. An average of 2.8 MGD is treated each day. The water system serves a population of approximately 9,000 customers. The location of CUWCD=s water supply intake is at Ashley Spring and Red Fleet Dam. The boundaries of each watershed and location of intakes are shown in Figures 1.and
2. The total watershed area is 201,611 acres, and covers parts of Uintah County (Figures 1 & 2).
Dry Fork and Ashley Creeks are the largest streams in the Ashley Spring watershed and are fed by numerous smaller tributaries. Most of the watershed is within the Ashley National Forest boundary with land use and water quality impacts addressed through the Forest Management Plan. Approximately 85% percent of the watershed is forested. Camping and other recreation activities take place within the boundaries of the watershed. A 60-acre area of private ground is used for summer residential uses.
Big Brush Creek is the main stream in the Red Fleet watershed. About 70% of this watershed is within Ashley National Forest with camping, recreation, and other associated Forest activities.
The remaining area consists of the State Park (Red Fleet) with water related recreation and camping and also the Simplot Fertilizer Phosphate plant.
Water Quality and Water Treatment Information
Water withdrawn from Ashley Spring and Red Fleet Reservoir is treated by Ashley Valley Water Treatment Plant (AVWTP) prior to distribution to customers. This plant uses a coagulation, flocculation, and direct filtration process with the addition of chlorine for final disinfection. The water quality testing performed by CUWCD concluded that results of the tap water sampling done in 2001 were acceptable.
Evaluation of Significant Potential Sources of Contamination
This assessment evaluates contaminants that may enter the water before treatment. The contaminants addressed in this assessment include those regulated under the federal Safe Drinking Water Act as well as those that CUWCD has determined may present a concern to health. Each significant potential source of contamination has been analyzed and given a qualitative susceptibility rating according to its potential to impact the water supply.
Potential Impact to Source Water Quality Untreated sewage discharges, nitrogen and phosphorus fertilizer, and pathogens (bacteria, virus, Giardia, and Cryptosporidium).
Concerning the contaminants indicated above, both treated and untreated sewage discharges into the watershed may be significant sources of waterborne pathogens (disease causing organisms).
A concern remains about Cryptosporidium and Giardia since these pathogens cause intestinal diseases which can be very serious for people with a weakened immune system, those undergoing chemotherapy or dialysis, transplant patients, and people with Crohn=s disease or HIV infection.
Giardia and Cryptosporidium pathogens have not been found in Ashley Spring and Cryptosporidium has not been found in Red Fleet Reservoir. But it is probably that these pathogens could be found in the future. The increase of these pathogens is probably attributable to failed septic systems, and fecal matter from farm animals and perhaps wildlife close to or entering the waterways. Levels of these pathogens appear to increase in stream water following a heavy precipitation event.
Filtration removes about 99% of such pathogens before water reaches the tap. A combination of direct filtration and chlorine disinfection at CUWCD=s Ashley Valley Water Treatment Plant removes and/or destroys most of these pathogens.
In terms of nutrient contaminants in the watershed, elevated levels of nitrates were linked to fertilizer applications during reseeding projects tried in the watershed. This led to an agreement with the Forest Service to not use fertilizer in reseeding projects within the watershed in the future.
The impact of hazardous materials within the watershed or as a result of spills is minimal to the Public Water Supply. Stored materials are regulated under state and federal agencies and are identified by permit or site numbers. In the case of spills, notification through emergency response planning should provide adequate protection to the water supply.
Ongoing Watershed Protection Activities State and federal agencies regulate direct discharge of regulated contaminants in this watershed.
Other volunteer and government agencies are working cooperatively to address contamination within the watershed.
Source Water Protection Needs Based on the evaluation that was completed as part of this Source Water Assessment, CUWCD has determined that existing state and local programs should provide adequate protection of these drinking water sources. Special attention is needed to reduce levels of pathogens in stream water. Emphasis should be placed on improving detection and treatment of pathogens such as Cryptosporidium. Better understanding of the risks associated with Cryptosporidium may result in the need to enhance protection (or treatment).
How to Obtain Additional Information This Source Water Assessment Public Summary was completed in July, 2009. Individuals interested in learning more about this water system and watershed can contact Ashley Valley Water Treatment Plant at 435-789-0421.