SOURCE WATER ASSESSMENTSUMMARY BROCHURE

OCEANSIDE WATER DISTRICTPWS # 4100585

WHAT IS A SOURCE WATER ASSESSMENT?The Source Water Assessment was recentlycompleted by the Department of EnvironmentalQuality (DEQ) and the Oregon Health Division(OHD) to identify the surface areas (and/orsubsurface areas) that supply water to OceansideWater District’s public water system intake andto inventory the potential contaminant sourcesthat may impact the water supply.

WHY WAS IT COMPLETED?The Source Water Assessment was completed toprovide information so that Oceanside WaterDistrict’s public water system staff/operator,consumers, and community citizens can begindeveloping strategies to protect the source oftheir drinking water, and to minimize futurepublic expenditures for drinking watertreatment. The assessment was prepared underthe requirements and guidelines of the FederalSafe Drinking Water Act (SDWA).

WHAT AREAS ARE INCLUDED IN OCEANSIDEWATER DISTRICT’S DRINKING WATERPROTECTION AREA?The drinking water for Oceanside Water Districtis supplied by an intake on the Short Creek.This public water system serves approximately350 citizens. The intake is located in theNetarts Bay/Sand Lake/Neskowin CreekWatershed in the Wilson-Trask-Nestucca Sub-Basin of the Northern Oregon Coast Basin. Thegeographic area providing water to Oceanside’sintake (the drinking water protection area)extends upstream approximately 4.5 miles in aneasterly direction and encompasses a total areaof approximately 2 square miles. Theboundaries of the Drinking Water ProtectionArea are illustrated on the figure attached to thissummary.

WHAT ARE THE POTENTIAL SOURCES OFCONTAMINATION TO OCEANSIDE WATERDISTRICT’S PUBLIC DRINKING WATERSUPPLY?The primary intent of this inventory was toidentify and locate significant potential sourcesof contaminants of concern. The delineateddrinking water protection area is exclusivelydominated by managed forest lands. Thepotential sources of contamination identifiedwithin Oceanside’s drinking water protectionarea include the managed forest lands whichoccur throughout the protection area, anypesticide/herbicide/fertilizer or petroleumstorage/handling or mixing area(s), and potentialactivities associated with a caretaker’s facility.This provides a quick look at the existingpotential sources of contamination that could, ifimproperly managed or released, impact thewater quality in the watershed.

WHAT ARE THE RISKS FOR OUR SYSTEM?The entire Oceanside drinking water protectionarea is identified as being sensitive tocontamination based on the presence of soilsidentified to have high soil erosion potential.The sensitive areas are those where the potentialcontamination sources, if present, have a greaterpotential to impact the water supply. Both of thepotential contaminant sources identified in theprotection area are located within sensitive areasand pose a relatively higher to moderate risk tothe drinking water supply. The information inthis assessment provides a basis for prioritizingareas in and around our community that are mostvulnerable to potential impacts and can be usedby the Oceanside Water District community todevelop a voluntary Drinking Water ProtectionPlan.

NEED MORE INFORMATION?Oceanside Water District’s Source WaterAssessment Report provides additional detailson the methodology and results of thisassessment. The full report is available forreview at:_______________________________________Contact the Oceanside Water District staff if youwould like additional information on theseSource Water Assessment results.

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100585 OCEANSIDE WATER DISTRICT 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 Managed Forest Managed Forest All of the DWPA Oceanside Field- Within Higher Cutting and yarding of trees may Land - Clearcut Lands - Shiloh Observation sensitive contribute to increased erosion, resulting in Harvest (< 35 yrs.) Forest Enterprises Interview turbidity and chemical changes in drinking Clear cuts are scattered throughout DWPA and are of water supply. Over-application or improper widely varied ages. Much of handling of pesticides or fertilizers may region located beyond public impact drinking water source. access, but was viewed from a distance. PWS interview further illustrated ownership extent.

Managed Forest Moderate Over-application or improper handling of Land - Broadcast pesticides or fertilizers may impact the Fertilized Areas drinking water source. Clear cuts are scattered throughout DWPA and are of widely varied ages. Much of region located beyond public access, but was viewed from a distance. PWS interview further illustrated ownership extent.

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 2

TABLE 2. INVENTORY RESULTS - LIST OF POTENTIAL CONTAMINANT SOURCES PWS# 4100585 OCEANSIDE WATER DISTRICT 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

2 Homesteads - Rural Caretaker's Ridge summit in Oceanside Field- Within Lower If not properly sited, designed, installed, - Septic Systems residence - Shiloh northeast section of DWPA Observation sensitive and maintained, septic systems can (< 1/acre) Forest Enterprises Interview impact drinking water. Use of drain No visual observation of site - site location is based on cleaners and dumping household hazardous wastes can result in groundwater Ownership based in Chicago, IL. Site comprised of local operations station and caretaker's residence.

Homesteads - Rural Higher Spills, leaks, or improper handling of - Machine solvents, fuels, and other materials or Shops/Equipment chemicals during transportation, use, No visual observation of site - Maintenance storage and disposal may impact the site location is based on drinking water supply. Ownership based in Chicago, IL. Site comprised of local operations station and caretaker's residence.

Pesticide/Fertilizer/ Higher Leaks, spills and improper handling of Petroleum Storage, pesticides, fertilizers and petroleum Handling, Mixing, & products may impact drinking water No visual observation of site - Cleaning Areas site location is based on Ownership based in Chicago, IL. Site comprised of local operations station and caretaker's residence.

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 2 of 2