SOURCE WATER ASSESSMENT SUMMARY BROCHURE

CITY OF THE DALLES

PWS # 4100869 WHAT IS A SOURCE WATER ASSESSMENT? The Source Water Assessment was recently completed by the Department of Environmental Quality (DEQ) and the Oregon Department of Human Services (DHS) to identify the surface areas (and/or subsurface areas) that supply water to City of The Dalles’ public water system intake and to inventory the potential contaminant sources that may impact the water supply. WHY WAS IT COMPLETED? The Source Water Assessment was completed to provide information so that City of The Dalles’ public water system staff/operator, consumers, and community citizens can begin developing strategies to protect the source of their drinking water, and to minimize future public expenditures for drinking water treatment. The assessment was prepared under the requirements and guidelines of the Federal Safe Drinking Water Act (SDWA). WHAT AREAS ARE INCLUDED IN THE DALLES’ DRINKING WATER PROTECTION AREA? The drinking water for the City of The Dalles is supplied by three groundwater wells and two surface water intakes located on South Fork Mill Creek and Dog River. The Dalles’ public water system serves approximately 11,350 citizens. This Source Water Assessment addresses only the surface water component of The Dalles’ drinking water supply. The groundwater supply will be addressed separately. The South Fork Mill Creek and Dog River surface water intakes are located in the Mill Creek and East Fork Hood River Watersheds (respectively) in the Middle Columbia - Hood Subbasin of the Middle Columbia Basin. The streams that contribute to the South Fork Mill Creek and Dog Rivers intakes extend upstream a cumulative total of approximately 117 miles and encompass a total area of approximately 32 square miles. The combination of the geographic areas contributing to the South Fork Mill Creek and Dog Rivers intakes make-up The Dalles’ drinking water protection area. The boundaries of the Drinking Water Protection Area are illustrated on the figure attached to this summary.

WHAT ARE THE POTENTIAL SOURCES OF CONTAMINATION TO THE SURFACE WATER PORTION OF THE DALLES’ PUBLIC DRINKING WATER SUPPLY? The primary intent of this inventory was to identify and locate significant potential sources of contaminants of concern. The drinking water protection area upstream of the South Fork Mill Creek intake is primarily dominated by forestry and agricultural land uses and the protection area upstream of the Dog River intake is primarily dominated by forestlands. The potential contaminant sources identified in the protection areas include a pre-1945 cemetery, a well, non-irrigated pasture, timber clear-cut and partial harvest forest lands, an upstream dam and the Wicks Water Treatment Plant. This provides a quick look at the existing potential sources of contamination that could, if improperly managed or released, impact the water quality in the watershed. WHAT ARE THE RISKS FOR OUR SYSTEM? Seven potential contaminant sources were identified that may affect the City of The Dalles’ drinking water protection area for the surface water sources. Six of these are located in the sensitive areas and four are high- to moderate-risk sources within “sensitive areas”. The sensitive areas within The Dalles’ drinking water protection area include areas with high soil erosion potential, high runoff potential and areas within 1000’ from the river/streams. The sensitive areas are those where the potential contamination sources, if present, have a greater potential to impact the water supply. The information in this assessment provides a basis for prioritizing areas in and around our community that are most vulnerable to potential impacts and can be used by the City of The Dalles community to develop a voluntary Drinking Water Protection Plan. NEED MORE INFORMATION? City of The Dalles’ Source Water Assessment Report provides additional details on the methodology and results of this assessment. The full report is available for review at: _______________________________________ Contact the City Public Works staff if you would like additional information on these Source Water Assessment results.

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

1 UST - Confirmed Jack's Mini Market Brett Clodfelter Way The Dalles Database (2) Within the 2-yr Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ Field- TOT. for WELL improper handling of stored materials may List Observation #1 (LONE impact the drinking water supply. PINE)

UST - Lower Historic spills or leaks may impact the drinking Decommissioned/Inac water supply. tive

UST - Lower Spills or improper handling during tank filling or Upgraded/Registered product distribution may impact the drinking - Active water supply. Automobiles - Gas Higher Spills, leaks, or improper handling of fuels and Stations other materials during transportation, transfer, and storage may impact the drinking water supply.

2 Automobiles - Gas Ringer's Texaco Hwy 197E The Dalles Database (2) Within the 2-yr Higher Spills, leaks, or improper handling of fuels and Stations Field- TOT. for WELL other materials during transportation, transfer, Observation #1 (LONE and storage may impact the drinking water PINE) supply.

UST - Confirmed Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ improper handling of stored materials may List impact the drinking water supply. UST - Lower Spills or improper handling during tank filling or Upgraded/Registered product distribution may impact the drinking - Active water supply. UST - Status Higher Spills, leaks, or improper handling of stored Unknown materials may impact the drinking water supply.

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 1 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

3 UST - Not Upgraded WM Van Nuys Old Hwy 197 The Dalles Database (2) Within the 2-yr Higher Spills, leaks, or improper handling of stored and/or Registered Riverview Shell TOT. for WELL materials may impact the drinking water supply. Tanks #1 (LONE PINE)

UST - Lower Historic spills or leaks may impact the drinking Decommissioned/Inac water supply. tive

UST - Confirmed Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ improper handling of stored materials may List impact the drinking water supply. Automobiles - Gas Higher Spills, leaks, or improper handling of fuels and Stations other materials during transportation, transfer, and storage may impact the drinking water supply.

4 Utility Stations - William Gas Hwy 197 The Dalles Database (2) Within the 2-yr Higher Spills, leaks, or improper handling of chemicals Maintenance Pipelines-West NW TOT. for WELL and other materials including PCBs during Transformer Storage Natural Gas #1 (LONE transportation, use, storage and disposal may PINE) impact the drinking water supply.

5 Drinking Water Drinking Water Lone Pine Wellhead- The Dalles Database (2) Within the 2-yr Moderate Treatment chemicals and equipment Treatment Plants Treatment Plant Hwy 197 TOT. for WELL maintenance materials may impact groundwater #1 (LONE or surface water source. PINE)

6 Apartments and Columbia Shores Lone Pine Dr. The Dalles Field- Between 2-yr Lower Improper use, storage, and disposal of Condominiums Condos Observation and 5-yr TOT household and facility maintenance chemicals for WELL #1 may impact the drinking water supply. (LONE PINE) Stormwater run-off or infiltration may carry contaminants to water supply.

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 2 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

7 Campgrounds/RV Lone Pine RV Park Lone Pine Dr. The Dalles Field- Within the 2-yr Lower Leaks or spills of automotive fluids or improperly Parks Observation TOT. for WELL managed septic systems and wastewater #1 (LONE disposal may impact drinking water supply. PINE) Heavy usage along edge of waterbody may contribute to erosion, causing turbidity.

8 Golf Courses Golf Course Lone Pine Dr. The Dalles Field- Between 5-yr Moderate Over-application or improper handling of Observation and 10-yr TOT pesticides or fertilizers may impact drinking for WELL #1 water. Excessive irrigation may cause transport (LONE PINE) of contaminants to groundwater or surface water through runoff.

9 Wastewater Treatment East Side Lift Station Eastland & Fire Rd The Dalles Field- Between 5-yr Moderate Improper management of wastewater, treatment Plants/Collection Observation and 10-yr TOT chemicals, or equipment maintenance materials Stations for WELL #1 may impact drinking water supply. (LONE PINE)

10 Transportation - Hwy 84 & 197 Freeway East & West and The Dalles Field- Between 2-yr Moderate Vehicle use increases the risk for leaks or spills Freeways/State 197 North & South Observation and 5-yr TOT of fuel & other haz. materials. Road building, Highways/Other for WELL #1 maintenance & use can increase erosion/slope Heavy Use Roads (LONE PINE) failure causing turbidity. Over-application or improper handling of pesticides/fertilizers may impact water.

11 Transportation - Railroad East/West through DWPA The Dalles Field- Between 5-yr Moderate Rail transport elevates the risk for leaks/spills of Railroads Observation and 10-yr TOT fuel & other haz. materials. for WELL #1 Installation/maintenance of tracks may increase (LONE PINE) erosion & slope failure causing turbidity. Over- application/improper handling of pesticides may impact the water supply.

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 3 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

12 Wood Kerr McGee Tie Plant Rd The Dalles Database (2) Just outside Higher Spills, leaks, or improper handling of chemicals Preserving/Treating Chemical (Formerly Field- DWPA for and other materials during transportation, use, UPRR CH2M Hill Observation WELL #1 storage and disposal may impact the drinking Site) (LONE PINE) water supply. UST - Not Upgraded Higher Spills, leaks, or improper handling of stored and/or Registered materials may impact the drinking water supply. Tanks

13 Pesticide/Fertilizer/Pe UAP Northwest East 2nd St The Dalles Database (2) Just outside Higher Leaks, spills and improper handling of troleum Storage, Field- DWPA for pesticides, fertilizers and petroleum products Handling, Mixing, & Observation WELL #1 may impact drinking water source. Cleaning Areas (LONE PINE)

14 UST - Confirmed Tetzloff Residence Trevitt Dr The Dalles Database (2) Within the 2-yr Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ TOT. for WELL improper handling of stored materials may List #2 (JORDAN impact the drinking water supply. STREET)

UST - Lower Historic spills or leaks may impact the drinking Decommissioned/Inac water supply. tive

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 4 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

15 UST - Not Upgraded The Dalles Olney Rd The Dalles Database (2) Between 2-yr Higher Spills, leaks, or improper handling of stored and/or Registered Irrigation District Field- and 5-yr TOT materials may impact the drinking water supply. Tanks Observation for WELL #3 (MARKS)

UST - Confirmed Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ improper handling of stored materials may List impact the drinking water supply. UST - Lower Historic spills or leaks may impact the drinking Decommissioned/Inac water supply. tive

Utility Stations - Higher Spills, leaks, or improper handling of chemicals Maintenance and other materials including PCBs during Transformer Storage transportation, use, storage and disposal may impact the drinking water supply.

16 UST - Status Barry Residence W. Scenic Dr. The Dalles Database (2) Between 2-yr Higher Spills, leaks, or improper handling of stored Unknown Field- and 5-yr TOT materials may impact the drinking water supply. Observation for WELL #2 (JORDAN STREET)

UST - Confirmed Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ improper handling of stored materials may List impact the drinking water supply.

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 5 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

17 Schools Columbia Gorge E. Scenic Dr. The Dalles Database (2) Between 2-yr Lower Over-application or improper handling of Comm. College and 5-yr TOT cleaning products, pesticides or fertilizers used for WELL #2 on the school grounds may impact drinking (JORDAN water. Vehicle maintenance wastes may STREET) contribute contaminants.

UST - Status Higher Spills, leaks, or improper handling of stored Unknown materials may impact the drinking water supply.

UST - Confirmed Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ improper handling of stored materials may List impact the drinking water supply.

18 Drinking Water City of The Dalles- Jordan Wellhead Chemical The Dalles Database (2) Within the 2-yr Moderate Treatment chemicals and equipment Treatment Plants Drinking Water Storage Field- TOT. for WELL maintenance materials may impact groundwater Treatment Observation #2 (JORDAN or surface water source. STREET)

19 Schools The Dalles School W. 14th st The Dalles Database (2) Within the 2-yr Lower Over-application or improper handling of Dist. #12 Col. TOT. for WELL cleaning products, pesticides or fertilizers used Wright School #2 (JORDAN on the school grounds may impact drinking STREET) water. Vehicle maintenance wastes may contribute contaminants.

20 Food Processing Polehn Farms 2121 Dry Hollow Rd The Dalles Field- Between 2-yr Moderate Spills, leaks, or improper handling of chemicals Observation and 5-yr TOT and other materials during transportation, use, for WELL #2 storage and disposal may impact the drinking (JORDAN water supply. STREET)

21 Drinking Water The City of The Marks Wellhead The Dalles Database (2) Within the 2-yr Moderate Treatment chemicals and equipment Treatment Plants Dalles-Marks Field- TOT. for WELL maintenance materials may impact groundwater Wellhead Chem. Observation #3 (MARKS) or surface water source. Storage

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 6 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

22 UST - Not Upgraded Wasco County Steele Rd. (Just outside The Dalles Database (2) Just outside Higher Spills, leaks, or improper handling of stored and/or Registered Landfill DWPA) DWPA for materials may impact the drinking water supply. Tanks WELL #2 (JORDAN STREET)

Landfill/Dumps Just outside Higher Water percolating through the landfill waste DWPA for material may transport contaminants to WELL #3 groundwater or surface water supply. (MARKS)

UST - Not Upgraded Higher Spills, leaks, or improper handling of stored and/or Registered materials may impact the drinking water supply. Tanks

Landfill/Dumps Just outside Higher Water percolating through the landfill waste DWPA for material may transport contaminants to WELL #2 groundwater or surface water supply. (JORDAN STREET)

23 Parks Sorosis Park Scenic Dr. The Dalles Field- Between 2-yr Moderate Over-application or improper handling of Observation and 5-yr TOT pesticides/fertilizers may impact drinking water. for WELL #2 Excessive irrigation may cause transport of (JORDAN contaminants through runoff. Heavy use along STREET) edge of 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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 7 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

24 Pesticide/Fertilizer/Pe Irrigated Orchards Throughout DWPA The Dalles Field- Between 2-yr Higher Leaks, spills and improper handling of troleum Storage, Observation and 5-yr TOT pesticides, fertilizers and petroleum products Handling, Mixing, & for WELL #2 may impact drinking water source. Cleaning Areas (JORDAN STREET)

Crops - Irrigated (inc. Between 2-yr Moderate Over-application or improper handling of orchards, vineyards, and 5-yr TOT pesticides/fertilizers may impact drinking water. nurseries, for WELL #3 Excessive irrigation may transport contaminants greenhouses) (MARKS) or sediments to groundwater/surface water through runoff. Drip-irrigated crops are considered to be a low risk.

Crops - Irrigated (inc. Between 2-yr Moderate Over-application or improper handling of orchards, vineyards, and 5-yr TOT pesticides/fertilizers may impact drinking water. nurseries, for WELL #2 Excessive irrigation may transport contaminants greenhouses) (JORDAN or sediments to groundwater/surface water STREET) through runoff. Drip-irrigated crops are considered to be a low risk.

Pesticide/Fertilizer/Pe Between 2-yr Higher Leaks, spills and improper handling of troleum Storage, and 5-yr TOT pesticides, fertilizers and petroleum products Handling, Mixing, & for WELL #3 may impact drinking water source. Cleaning Areas (MARKS)

25 Homesteads - Rural - Rural Homestead Throughout DWPA The Dalles Field- Between 2-yr Higher Spills, leaks, or improper handling of solvents, Machine machine shop/equip Observation and 5-yr TOT fuels, and other materials or chemicals during Shops/Equipment maint. for WELL #2 transportation, use, storage and disposal may Maintenance (JORDAN impact the drinking water supply. STREET)

Homesteads - Rural - Between 2-yr Higher Spills, leaks, or improper handling of solvents, Machine and 5-yr TOT fuels, and other materials or chemicals during Shops/Equipment for WELL #3 transportation, use, storage and disposal may Maintenance (MARKS) impact the drinking water supply.

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 8 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

26 UST - Status Riess Trust HOT 15th Place The Dalles Database (2) Between 2-yr Higher Spills, leaks, or improper handling of stored Unknown Field- and 5-yr TOT materials may impact the drinking water supply. Observation for WELL #2 (JORDAN STREET)

UST - Confirmed Higher Existing contamination from spills, leaks, or Leaking Tanks - DEQ improper handling of stored materials may List impact the drinking water supply.

27 Housing - High High-density housing 2-5 yr TOT The Dalles Field- Within the 2-yr Moderate Improper use, storage, and disposal of Density (> 1 Observation TOT. for WELL household chemicals may impact the drinking House/0.5 acres) Interview #2 (JORDAN water supply. Stormwater run-off or infiltration STREET) may carry contaminants to drinking water supply.

28 Drinking Water Wicks Water Near surface water intake The Dalles Field- Just outside Moderate Treatment chemicals and equipment Treatment Plants Treatment Plant Observation DWPA for maintenance materials may impact groundwater FORK MILL or surface water source. CREEK

29 Wells/Abandoned Wicks Well The Dalles Field- Within Moderate Improperly installed or maintained wells and Wells Observation sensitive area. abandoned wells may provide a direct conduit for for FORK contamination to groundwater and drinking MILL CREEK water source.

30 Crops - Nonirrigated Non-Irrigated North of Mill Creek Falls The Dalles Interview Within Lower Over-application or improper handling of (inc. Christmas trees, Pasture sensitive area. pesticides/fertilizers may impact drinking water. grains, grass seed, for FORK Some agricultural practices may result in Throughout eastern portion of pasture) MILL CREEK excess sediments discharging to surface DWPA north of South Fork Mill Creek. SDS Lumber Co. owns the waters, but non-irrigated crops are generally pasture land. considered to be a low risk.

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 9 of 10

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100869 THE DALLES, CITY OF Reference Potential Proximity to Relative No. (See Contaminant Approximate Method for Sensitive Risk Level Figure) Source Type Name Location City Listing Areas (1) Potential Impacts Comments

31 Managed Forest Land Multiple Clearcuts The Dalles Interview Within Higher Cutting and yarding of trees may contribute to - Clearcut Harvest (< sensitive area. increased erosion, resulting in turbidity and 35 yrs.) for FORK chemical changes in drinking water supply. The clearcuts are less than 10 MILL CREEK Over-application or improper handling of acres, and are not adjacent to the stream. pesticides or fertilizers may impact drinking water source.

32 Managed Forest Land Partial Harvest The Dalles Interview Within Higher Cutting and yarding of trees may contribute to - Partial Harvest (< sensitive area. increased erosion, resulting in turbidity and 10 yrs.) for FORK chemical changes (ex: nitrates) in drinking Carefully managed for impact to MILL CREEK water supply. Over-application or improper water quality. handling of pesticides or fertilizers may impact drinking water source.

33 Upstream Crow Creek Dam Confluence of South Fork The Dalles Field- Within Moderate During major storm events, reservoirs may Reservoirs/Dams Mill Creek with Crow Creek Observation sensitive area. contribute to prolonged turbidity for downstream for FORK intakes for drinking water. Construction, MILL CREEK fluctuating water levels, and heavy waterside use can increase erosion and turbidity in reservoir/drinking water source.

34 Cemeteries - Pre- Cemetery near intersection of Suicide The Dalles Interview Within Lower Embalming fluids (for example, arsenic) and 1945 Grade Rd. and Old Mail sensitive area. decomposition by-products may impact drinking Road. for FORK water supply. MILL CREEK

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 (1) Where multiple potential contaminant sources exist at a site, the highest level of risk is (2) See Table 3 for database listings (if 5/21/2003 Page 10 of 10