City of Cottage Grove (PWS #4100236)
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SOURCE WATER ASSESSMENT WHAT ARE THE POTENTIAL SOURCES OF SUMMARY BROCHURE CONTAMINATION TO CITY OF COTTAGE GROVE’S PUBLIC DRINKING WATER SUPPLY? The primary intent of this inventory was to CITY OF COTTAGE GROVE identify and locate significant potential sources PWS # 4100236 of contaminants of concern. The delineated drinking water protection area is primarily WHAT IS A SOURCE WATER ASSESSMENT? dominated managed forest land uses in the upper The Source Water Assessment was recently reaches and by residential and limited completed by the Department of Environmental commercial development along the main rivers, Quality (DEQ) and the Oregon Health Division creeks and Dorena Lake. The potential (OHD) to identify the surface areas (and/or contaminant sources identified in the watershed subsurface areas) that supply water to City of include managed forest lands, campgrounds and Cottage Grove’s public water system intake and recreational areas, nurseries, quarries, several to inventory the potential contaminant sources parks, residential areas with septic systems and that may impact the water supply. wells, gas stations (currently active and historic), a former mill, and the drinking water treatment WHY WAS IT COMPLETED? plants. This provides a quick look at the existing The Source Water Assessment was completed to potential sources of contamination that could, if provide information so that City of Cottage improperly managed or released, impact the Grove’s public water system staff/operator, water quality in the watershed. consumers, and community citizens can begin developing strategies to protect the source of WHAT ARE THE RISKS FOR OUR SYSTEM? their drinking water, and to minimize future A total of 45 potential contaminant sources were public expenditures for drinking water identified in City of Cottage Grove’s drinking treatment. The assessment was prepared under water protection area. All of these are located in the requirements and guidelines of the Federal the sensitive areas and 43 are high- to moderate- Safe Drinking Water Act (SDWA). risk sources within “sensitive areas”. The sensitive areas within the City of Cottage Grove WHAT AREAS ARE INCLUDED IN CITY OF drinking water protection area include areas with COTTAGE GROVE’S DRINKING WATER high soil permeability, high soil erosion PROTECTION AREA? potential, high runoff potential and areas within The drinking water for the City of Cottage 1000’ from the river/streams. The sensitive areas Grove is supplied by surface water intakes are those where the potential contamination located on Row River, Prather Creek, and sources, if present, have a greater potential to Laying Creeks and by a supplemental impact the water supply. The information in this groundwater well. This public water system assessment provides a basis for prioritizing areas serves approximately 8,500 citizens. The in and around our community that are most combination of the geographic areas vulnerable to potential impacts and can be used contributing to the Row River, Prather Creek, by the City of Cottage Grove community to and Laying Creeks intakes make-up Cottage develop a voluntary Drinking Water Protection Grove’s drinking water protection area for Plan. surface water sources. A separate brochure will be provided identifying the protection area for NEED MORE INFORMATION? the groundwater supply. The intakes are located City of Cottage Grove’s Source Water in the Lower Row River and Laying Creek Assessment Report provides additional details Watersheds of the Coast Fork Willamette Sub- on the methodology and results of this Basin of the Willamette Basin. The streams that assessment. The full report is available for contribute to the intakes extend upstream a review at: cumulative total of approximately 34 miles and _______________________________________ encompass a total area of approximately 371 Contact the City Public Works staff if you square miles. The boundaries of the Drinking would like additional information on City of Water Protection Area are illustrated on the Cottage Grove’s Source Water Assessment figure attached to this summary. results. TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100236 COTTAGE GROVE, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Name Location City Listing Areas (1) Potential Impacts Comments Type 1 Housing - High Dorena Lake South side of Row River Cottage Database (2) Within Moderate Improper use, storage, and disposal of Density (> 1 Mobile Home Park Rd., ~2km below Dorena Grove Field- sensitive household chemicals may impact the House/0.5 acres) Lake dam Observation area. for drinking water supply. Stormwater run-off ROW RIVER or infiltration may carry contaminants to (I.G.) drinking water supply. Large Capacity Moderate If not properly sited, designed, installed, Septic Systems and maintained, septic systems can (serves > 20 impact drinking water. people) - Class V UICs 2 Campgrounds/RV Schwarz North of Shore View Rd. Cottage Database (2) Within Moderate Leaks or spills of automotive fluids or Parks Campground (US just below dam Grove Field- sensitive improperly managed septic systems and Army CoE) Observation area. for wastewater disposal may impact drinking Interview ROW RIVER water supply. Heavy usage along edge of (I.G.) waterbody may contribute to erosion, causing turbidity. 3 River Recreation - Baker Bay Park South side of Dorena Cottage Field- Within Moderate Inadequate disposal of human wastes may Heavy Use (inc. Reservoir Grove Observation sensitive contribute bacteria and nutrients to the campgrounds) Interview area. for drinking water supply. Heavy use may Heavily used recreation site ROW RIVER contribute to streambank erosion causing with boat launch and marina. No (I.G.) turbidity. Fuel spills and emissions may apparent fueling. also contribute to contamination. Other marina/boat Moderate The impacts of this potential contaminant launch source will be addressed during the enhanced inventory. Heavily used recreation site with boat launch and marina. No apparent fueling. Campgrounds/RV Moderate Leaks or spills of automotive fluids or Parks improperly managed septic systems and wastewater disposal may impact drinking Heavily used recreation site with boat launch and marina. No water supply. Heavy usage along edge of apparent fueling. waterbody may contribute to erosion, causing turbidity. Note: Sites and areas identified in this Table are only potential sources of contamination to the drinking water. Environmental contamination is not likely to occur when contaminants are used and managed properly. (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is used. (2) See Table 3 for database listings (if necessary). 2/14/2003 Page 1 of 15 TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100236 COTTAGE GROVE, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Name Location City Listing Areas (1) Potential Impacts Comments Type 4 Crops - Nonirrigated Dorena Tree Shore View Rd., between Cottage Database (2) Within Lower Over-application or improper handling of (inc. Christmas Improvement Schwarz and Baker Bay Grove Field- sensitive pesticides/fertilizers may impact drinking trees, grains, grass Center Observation area. for water. Some agricultural practices may Forestry research facility. seed, pasture) (USFS/BLM) Interview ROW RIVER result in excess sediments discharging to (I.G.) surface waters, but non-irrigated crops are generally considered to be a low risk. 5 Campgrounds/RV Happy Eagle Shore View Rd. at Cottage Field- Within Moderate Leaks or spills of automotive fluids or Parks Lodge, RV Park, approximately mile post Grove Observation sensitive improperly managed septic systems and and Resort area. for wastewater disposal may impact drinking Unknown wastewater ROW RIVER water supply. Heavy usage along edge of treatment/disposal. (I.G.) waterbody may contribute to erosion, causing turbidity. 6 Campgrounds/RV Grove Christian Shore View Rd. at Dorena Cottage Field- Within Moderate Leaks or spills of automotive fluids or Parks Service Camp Covered Bridge Grove Observation sensitive improperly managed septic systems and Interview area. for wastewater disposal may impact drinking Unknown wastewater treatment ROW RIVER water supply. Heavy usage along edge of and disposal. (I.G.) waterbody may contribute to erosion, causing turbidity. 7 Historic Gas Unknown private Approx. mile post 9.3 on Cottage Field- Within Higher Historic spills, leaks, or improper handling Stations residence Row River Rd. Grove Observation sensitive of solvents and petroleum products may Interview area. for impact the drinking water supply. Property part of abandoned gas ROW RIVER Abandoned underground storage tanks station. Owner runs a small (I.G.) metal smithing business. UST - Status Moderate Spills, leaks, or improper handling of stored Unknown materials may impact the drinking water supply. Property part of abandoned gas station. Owner runs a small metal smithing business. Metal Higher Spills, leaks, or improper handling of Plating/Finishing/Fa solvents, metals, and other chemicals brication during transportation, use, storage and Property part of abandoned gas station. Owner runs a small disposal may impact the drinking water metal smithing business. Note: Sites and areas identified in this Table are only potential sources of contamination