Source Water Assessment Report -CITY OF SANDY
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SOURCE WATER
ASSESSMENT REPORT
Summary of Analysis
City of Sandy
Sandy, Oregon
Clackamas County
PWS #4100789
February 2005
Prepared By
Oregon Department of Human Services
Health Services
Drinking Water Program
And
Oregon Department of Environmental Quality
Water Quality Division
Drinking Water Protection
)~'DHs
Available in Alternate Formats by contac~i_ng the DHS DWP at (541)_~26-2587
Department of Human Services
Drinking Water Program
Springfield Field Office
444 A Street
Springfield, Oregon 97477
Dennis Nelson (for questions concerning
this report)
donelson~oregonvos, net
(541) 726-2587 ext 21
Fax (541) 726-2596
Main Office
800 NE Oregon Street, Room 611
P.O. Box 14450
Portland, Oregon 97293
(503) 731-4317
Fax: (503) 731-4077
Pendleton Field Office
700 SE Emigrant
Pendleton, OR 97801
(541) 276-8006
(541) 276-4778
Website: http://www.dhg.state'°r'us/Publichealthldwplindex'cfm
Department of Environmental Quality - Headquarters
Water. Quality Division
Drinking Water Program
811 SW 6~ Avenue
Portland, Oregon 97204 '
Julie Harvey (for assistance in developing a drinking water protection plan)' .
l~ARVEY.J~l~et~deq.state.or.~
(503) 229~5664 .
Fax (503) 229-6.124 Website: ~._S_t_ate.or.us/wq/dwp/dwphome.htm
Oregon Association of Water Utilities
12312 Silverton Rd. NE
Silverton, Oregon 97381
Mike Hayes (for assistance in developing a drinking water protection plan)
(503) 873-8353
Fax (503) 873-8538 Website: www.orednet.org/--oawu
Oregon Home*A*Syst Education Program
OSU Extension/Bioresource Engineering
Oregon State University
Corvallis, Oregon 97331-3906
Gail Glick Andrews (for outreach information concerning private wells/septic
systems)
(541) 737-6294 Website: h__t__tp3~I/wellwater.orst.edu
Department of Environmental Quality
Western Region Eugene Office
1102 Lincoln Street, Suite 210
Eugene, OR 97401.
(541) 686-7838
FAX (541) 686-7551
TTY (541 ) 687-5603
February 9, 2005
Mike Walker
City of Sandy
39250 Pioneer Blvd.
Sandy, OR 97055
Dear Mr. Walker:
The'respective Drinking Water-related Programs of the Department of Human
Services (DHS) and the Department of Environmental Quality (DEQ) are pleased
to transmit the accompanying Source Water Assessment Report for the City of
Sandy's groundwater derived Public Water Supply to you as the system's
representative. The document provides the system with a. map of the Drinking
Water Protection Area for the water system's spring, an inventory of potential
contaminant sources, a susceptibility analysis for the water system's drinking water
supply and a discussion of the potential use(s) of the report.
As mandated by the 1996 Amendments to the Safe Drinking Water Act, the report
provides the water system with the data necessary to develop a site-specific plan
for protecting the system's future drinking water resources if they choose. It is
also hoped that the report will provide sufficient information about groundwater in
the region so that the water system and County are able to make land use decisions
in a manner consistent with protecting the resource.
With respect to land use decisions, it is important to understand that the boundaries
of the drinking water protection area shown on the accompanying maps represent
our best professional judgment based on the information available to us at the time.
Although we are confident that the area delineated in fact represents the bulk of the
capture zone for the system's spring, it should be understood that, given the
uncertainties in the data used to determine the area, it is possible that some
groundwater may enter the capture zone from outside the illustrated boundaries.
DEQ-DCI
regon
Theodore R. Kulongoski, Governor
February 3, 2005
To: City of Sandy
Department of Human Services
Health ServiCes
Drinking Water Program
444 A Street
Springfield, OR 97477
(541) 726-2587 Ext.
FAX (541) 726-2596
TTY-Non Voice (503) 731-4031
From:
Amy Parmenter
DEQ Drinking Water Protection Program
Subject:
Reporting Completed Source Water Assessment in your CCR
As you are aware, the Safe Drinking Water Act requires that all community water
systems distribute a consumer confidence report to their customers by July 1 st of
each year. Questions regarding the specific requirements surrounding the CCR can
be addressed to Tom Mitchell at 503-731-4010. The purpose of this letter is to
offer you language for your CCR as related to the Source Water Assessment
program.
As part of the Source Water Assessment program, you haVe received a completed
Source Water Assessment Re_port for your drinking water source. The EPA has
indicated that if the Source Water Assessment has been completed for a water
system, the CCR must notify consumers of the availability of the rePort and the
means to obtain it. In addition, a brief summary of the Source Water Assessment
results should be included in the CCR using language provided by the Drinking
Water Program or written by the water system operator. Therefore, I have
suggested some language below for inclusion in your future reports. It is also my
understanding that you are required to supply the name of the aquifer from which
you are deriving your water which I've also included below. If you have any
questions, please feel free to contact me at 541-686-7838 ext. 278.
Suggested Statement for Consumer Confidence Report
The 1996 Amendments to the Safe Drinking Water Act require that all states
conduct Source Water Assessments for public water systems within their
"Assisting People to Become Independent, Healthy and Safe"
An Equal Opportunity Employer
IF YOU WOULD LIKE THIS IN ALTERNATE FORMAT, PLEASE CALL DENNIS NELSON AT (541) 726-2587 EXT. 21
boundaries. The assessments consist of (1) identification of the Drinking Water
Protection Area, i,e., the area at the surface that is directly above that part of the
aquifer that supplies groundwater to our well(s), (2) identification of potential
sources of pollution within the Drinking Water Protection Area, and (3)
determining the susceptibility or relative risk to the well water from those sources.
The purpose of the assessment is to provide water systems With the information
they need to develop a strategy to protect their drinking water resource if they
choose. The respective Drinking Water programs of the Departments of Human
Services and Environmental Quality have completed the assessment for our
system. A copy of the report is on file at the Water system's office.
Regarding the Source Water Assessment Report
The City of Sandy water system draws water from a shallow, unconfined, layered
volcanic aquifer in the Boring 'Lava. Assessment results indicate that the water
system would be highly sensitive to a contamination event inside the identified
Drinking Water Protection Area. The presence of a couple moderate- and' low-risk
potential contaminant sources within the protection area was confirmed through a
potential contaminant source inventory. Under a "worst case" scenario, where it is
assumed that nothing is being done to protect groundwater quality at the identified
potential contaminant sources, the assessment results indicate that the water system
would be highly susceptible to the identified moderate-risk potential contaminant
source. In addition, the assessment results indicate that, at this time, the water
system is considered susceptible to viral contamination.
SOURCE WATER
ASSESSMENT REPORT
Summary of Analysis
City of Sandy
Sandy, Oregon
Clackamas County
PWS #4! 00789
February 2005
Prepared By
Oregon Department of Human Services
Health Services
Drinking Water Program
And
Oregon Department of Environmental Quality
Water Quality Division
Drinking Water Protection
)~DHs
· On,giro
cfi Human
State of Oregon
Environmental
Quarry
Available in Alternate Formats by contacting the DHS DWP at (541) 726-258'/
TABLE OF CONTENTS
1. INTRODUCTION ....................................
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2. WATER SYSTEM BACKGROUND ..............
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2.1 LOCATION OF THE DRINKING WATER SOURCE(S) .................................................................. 2
2.2 SOURCE CONSTRucTioN ...................
2
2.3 NATURE AND CHARACTERISTICS OF THE AQUIFER ................................................................ 3
3. DELINEATION RESULTS ............................... .
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4. SENSITIVITY ANALYSIS RESULTS ...................
5. POTENTIAL CONTAMINANT SOURCE INVENTORY ................................................. 8
5.1 WITHIN SPRING RECHARGE AREA
6. SUSCEPTIBILITY OF THE DRINKING WATER SOURCE .......................................... 9
6. l AQUIFER SUSCEPTIBILITY TO POTENTIAL CONTAM[NANT SOURCES INSIDE THE DRINKING
WATER PROTECTION AREA ......................
6.2 WATER SYSTEM .................................................................................... 9
SUSCEPTIBILITY TO VIRAL CONTAMINANT SOURCES WITHIN THE SHORT-
TERM (ZONE 1) GROUNDWATER SUPPLY AREA ......................................................................... ] ]
7. CONCLUSIONS ...................
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8. RECOMMENDED USE OF THE SOURCE WATER ASSESSMENT REPORT ......... 13
APPENDIX MATERIALS .............
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City of Sandy
Source Water Assessment Report
Summary of Analysis
1. Introduction
The Source Water Assessment Program, mandated by the 1996 Amendments to the Safe
Drinking Water Act, requires 'that states provide the information needed by public water systems
to develop drinking water protection plans if they choose. That information includes the
identification of the area most critical to maintaining safe drinking water, i.e'., the Drinking
Water Protection Area, an inventory of potential sources of contamination within the Drinking
Water Protection Area, and an assessment of the relative threat that these potential sources pose
to the water system.
The intent of this report is to present our conclusions regarding the source water assessment
analysis for your water system. It is our hope that this information will be used as a basis for
reducing the risk of contamination to your water source through the development of a voluntary
Drinking Water Protection Plan (DWPP). Should you decided to proceed with the development
of a DWPP, this document can serve as the foundation for the plan. If, however, a more in depth
analysis of the local hydrogeology, water system susceptibility, and/or the water system specific
assumptions is needed to help promote the development of a DWPP, a more comprehensive'
assessment analysis can be made available to you by contacting either the DHS Project Manager
or the DHS Drinking Water Program Groundwater Coordinator.
The methodology that the Source Water Assessment results are based on is included in the
attached appendix materials under the heading, "Source Water Assessment Methodology". This
includes a discussion of the source water assessment project; groundwater basics; and the
processes involved with conducting the delineation, sensitivity analysis,' potential contaminant
source inventory, and overall water system susceptibility. Therefore, it is our intention that the
assessment results, identified in this portion of the report, be used in conjunction with the
methodology and rational presented in the appendix materials. For instance, if questions arise
regarding our conclusions with respect to a specific element of the assessment (i.e. type of
delineation used, aquifer sensitivity, springbox construction sensitivity, etc...), the methodology
that lead to our conclusions can be reviewed in the appendix materials for further clarification.
We believe public awareness is a powerful tool for protecting drinking water and that the
information provided in this report will help you increase local awareness regarding land use
activities and local drinking water quality. We have also included a "Groundwater Fact Sheet"
and a list of Oregon specific drinking water protection information and resources titled
"Drinking Water Protection in Oregon" in the appendix materials.
2. Water System Background
The City of Sandy is located in Clackamas County and.serves approximately 6,250 people
through 2,000 connections. Drinking water is supplied by one surface water source (Alder
Creek) and one groundwater source (Brownell Springs). According to DHS 'Drinking Water
Program records, both the creek and spring serve as permanent water sources. This report will
address only the groundwater source; the surface water source is addressed in a separate report.
2.1 Location of the Drinking Water Source(s)
We have located your drinking water source(s) using a Trimble GeoExplorer I1 Global
Positioning System (GPS) unit. The data has been differentially corrected to remove some of the
common positioning errors. The location of the source(s)~ with the corresponding Drinking
Water Protection Area, has been placed in a Geographic Information System (GIS) layer and
projected onto a USGS 7.5 minute topographic map that is included within this report. In order
to be consistent with the topographic map, the projection uses the NAD1927 datum. The latitude
and longitude values given on the map and below, however, reflect a projection in the more
commonly used WGS1984 datum.
Data collection specifics include:
· 150 individual measurements,
· linked to a minimum of four satellites,
· a PDOP of less than 6 (pertains to precision of measurement), and
· a signal to noise ratio of greater than 5.
The raw data was subjected to differential correction using the PATHFINDER software. The
location data for your drinking water source(s) using the WGS84 datum is as follows:
Source
Springs - Source
Latitude
45° 21' 34.6" N
________~gitude
122° 9' 14.0" W
2.2 Source Construction
The exact age of the springbox is unknown; however, according to the water system, it is likely
approximately 50 to 80 years old. In a sanitary survey conducted on 3/31/99, DHS Drinking
Water Program staff determined that there are no spring deficiencies pertaining to 'drinking water
protection. The spring construction consists of fencing, a springbox, a watertight hatch with a
screw-on lid. a diversion ditch, and a screened overflow. A bottom drain, collection piping, and
an impervious barrier were not observed.
2.3 Nature and Characteristics of the Aquifer
Based on the well report for a proximal well and Leonard and Collins' 1983 hydrogeologic
investigation of the area, the aquifer supplying the spring is composed of layered volcanics of the
Boring Lava. The well report for what appears to be the closest well to the spring within the
DWPA, CLAC 57844 (see Appendices), shows the first water-bearing zone from 60 to 90 feet
with a static water level of 40 feet. Leonard and Collins (1983) report that approximately half
the wells in the area tap shallow aquifers (less than 100 feet) in the Boring Lava. Based on
information available in the report for the proximal well and the hydrogeologic investigation, the
aquifer supplying the spring is considered to be a shallow, unconfined, layered volcanic
aquifer with a depth of less than 100 feet near the spring.
According to Leonard and Collins (1983), Brownell Spring has a discharge rate of approximately
400 gpm from the Boring Lava. The 1999 Sanitary Survey reports the discharge rate' as up to
530 gpm with a small seasonal variation and the water temperature as 8.8° C, which "varies
little". The specific conductance was not reported.
3. Delineation Results
The purpose of the Drinking Water Protection Area (DWPA) delineation is to identify the area at
the surface which overlies the critical portion of the aquifer that's supplying groundwater to the
water system's well(s) and/or spring(s). Therefore, DHS Drinking Water Program staff have
collected and reviewed data for the purpose of delineating the DWPA for your water system.
The area included in the DWPA is designed to approximate the long-term groundwater supply
for the water system, and is shown in Figure I (see appendix materials).
The scope of work for this portion of the assessment included interviewing the water system
operator, researching written reports, reviewing local well logs to help interpret geology, and
establishing a base map of the delineated area. Based on geologic characteristics, topographic
mapping was used to delineate the DWPA for the spring(s). The resulting DWPA is shown in
Figure 1 (see appendix materials). Specific information regarding the parameters used in the
delineation process including; the delineation method, estimated flow rate, and aquifer
characteristics can also be found in the appendix materials.
In most cases, three specific "Zones" have been identified for the spring(s) on the DWPA map
presented in Figure 1, (see appendix materials). The Zone 1 areas are the closest to the spring(s)
and include the surface water drainage immediately upslope from the spring(s). This area
represents the short-term water supply to the spring(s) where there is a high probability that
rainfall infiltrating into the ground within this area discharges at the spring(s) in a relatively short
time period. Therefore, it is reasonable to assume that accidents and/or high-risk land use
practices which occur within Zone 1 areas could have a negative impact on drinking water
quality.
The area(s) identified as Zone 2 represent the intermediate groundwater flow regime for the '
spring(s). These areas are surface water drainages directly adjacent to the Zone 1 areas which
drain surface water toward the same general location as the surface water captured in the Zone 1
area(s). In an unconfined aquifer, groundwater will move in the same general direction as the
slope of the land. Therefore, it is assumed that there is a potential for groundwater to move
laterally from the Zone 2 area(s) into the adjacent Zone 1 area(s) and provide a significant
amount of discharge to the spring(s).
The Zone 3 area(s) represents the origin Of the long-term groundwater flow regime or regional
recharge area for the spring(s) and thus, the long-term water supply. The Zone 3 boundaries
were identified by mapping portions of the surface water drainages that are at a higher elevation
than the spring(s) and were also in contact with Zone I and/or Zone 2. Surface water within the
Zone 3 area is typically carried away from the spring(s), however the-potential exists for the
underlying geologic structure of the area to dip (slope) back toward the spring(s) in the
subsurface thus forcing groundwater to move in a different direction than surface water. Any
groundwater moving from these areas toward the spring(s) is believed to take a longer period of
time to reach the spring(s), therefore the occurrence of a contamination event in this area is not
likely to have an immediate impact on water quality at the spring(s).
4. Sensitivity Analysis Results
After the Drinking Water Protection Area (DWPA) has been identified, aquifer susceptibility to
potential contaminant sources inside the DWPA can be evaluated. Aquifer susceptibility is
dependent on two factors, the natural environment's characteristics that permit migration of a
contaminant into the aquifer (i.e., aquifer sensitivity) and the presence, distribution, and nature of
the potential contaminant sources within the DWPA. It should be understood that the public
water system's drinking water source cannot be susceptible to contamination, even if potential
contaminant sources are present, unless the aquifer or the constructed source water intake are
sensitive to contamination. Therefore, the intent of the sensitivity analysis is to identify those
areas within the DWPA where the aquifer is most sensitive to contamination. The analysis is
based on data collected or generated during the DWPA delineation process and is designed to
meet the needs of other existing or developing programs such as Monitoring Waivers and the
Groundwater Rule.
The results of the sensitivity analysis are provided in the tables that follow. Information and
sensitivity ratings regarding the aquifer and water quality are provided in Table 4.1 while
information and sensitivity ratings regarding the springbox and its construction is provided in
Table 4.2. Clarification of the ratings are provided as comments where appropriate.
Based on this analysis; the construction of the springbox is not considered highly sensitive
to contamination; however, the natural condition of the aquifer is considered highly
sensitive because of its shallow, unconfined nature and high Infiltration Potential Score.
The age of the springbox and the presence of highly permeable soils within the DWPA
contribute to a moderate overall water system sensitivity. Sensitivity Analysis Tables follow,
beginning on the next page.
Table 4,1 A uifer Sensitivi Anal sis
·
Sensitivity
Parameter H~~ Comments
Estimated flow rate. Up to 530 gpm With a small
seasonal variation per 1999
Sanitary Survey.
Aquifer characteristics and geologic v/ Shallow, unconfined' interflow
factors controlling spring, zones of the Boring' Lava.
Overburden thickness and characteristics Unknown.
at spring outflow. ·
Fractured bedrock exposed at outflow. Unknown.
Traverse potential score, v/ Score = 3
Infiltration potential score. ~/ Score = 8
Organic chemical detections. '/ None detected.
'Inorganic chemical detections. ~/ Barium and chromium <50%
MCL. See paragraph following
Table 4.1.
Source related coliform detections, v/ None detected.
Nitrate concentrations (Drinking Water ~ 0.04 mg/L in 2002. Considered
Standard = 10 mg/L. to come from natural sources.
Number of wells within 500 ft'of spring ~ None observed.
inside DWPA.
Number of wells within 200 ft of spring v/ None observed.
inside DWPA.
Specific conductance in laS/cm. Unknown
Seasonal variations in flow, temperature, Flow: small variation.
or specific conductivity, v/ Temperature: constant.
Spec. Conduct: unknown.
Highest soil sensitivity in Protection Area. v/ Contributes to moderate aquifer
sensitivity.
Surface water within 500 ft of spring inside / None present.
DWPA.
Other: Sodium detection >20 mg/L. / No
The presence of barium and chromium (see "Inorganic Chemical Detections" in Table 4.1) at
concentrations less than 50% of the MCLs is likely due to natural sources; however, be aware
that the possibility of unnatural contributions exists.
Table 4.2 Springbox Construction Sensitivity Analysis
Sensitivity
Parameter H M L Comments
Spring construction and/or setback ~ 'None observed.
deficiencies from site visit.
~ No
Commingling of aquifers suspected.
~ Estimated-50-80 years old, per
Age of springbox, water system.
5. Potential Contaminant Source Inventory
An inventory of potential contamination sources was performed within the Drinking Water
Protection Area and the results are shown in Figure 2, (see appendix materials). The primary
intent of the inventory was to identify and locate significant potential contaminant sources of
concern. This inventory was conducted by reviewing applicable state and federal regulatory
databases and land use maps, interviewing persons knowledgeable of the area, and conducting a
windshield survey by driving through the drinking water protection area to field locate and verify
as many of the potential contaminant source activities as possible. It is important to remember
the sites and areas identified are only potential soUrces of contamination to the drinking water.
Environmental contamination is not likely to occur when contaminants are used and manag_e__d_d
5.1 Within Spring Recharge Area
The delineated spring recharge area is primarily dominated by a mix of forestry and residential
land use. Two potential contaminant soUrce locations (Reference Numbers five and six on
Figure 2 and Table 2 in the appendix) were identified in the spring recharge area and include
clearcuts and rural homes. The potential contaminant sources within the spring recharge area
all pose a relatively higher to moderate risk to the drinking water supply with the exception of
the rural homes, which present a lower risk. Area-wide potential sources such as the residential
areas and forestry areas occur throughout the drinking water protection area and are shown on
Figure 2 in the location nearest to the spring. In addition, an auto wrecker was identified located
just outside of the drinking water protection area. This potential source is included in .this
inventory because it poses a high degree of potential contamination risk.
6. Susceptibility of the Drinking Water Source
In general, Potential Contaminant Sources (PCSs) within the short-term groundwater supply area
pose a greater risk than those in the intermediate- and long-term supply areas. Also of concern is
the location and distribution of these sources with respect to high and moderately sensitive areas.
Overlaying the PCS location map (Figure 2, appendix materials) on top of the sensitivity map for
the water system provides a tool that helps determine the susceptibility of the community's
drinking water supply to contamination from each PCS (see Figure 3, appendix materials).
6.1 Aquifer Susceptibility to Potential Contaminant Sources Inside
the Drinking Water Protection Area
Table 6.1, indicates the relationship between potential contaminant source risk, aquifer
sensitivity, and estimated contaminant arrival time at the well, wellfield, and/or spring. The
community can use the PCS location numbers on the inventory map in conjunction with the
displayed aquifer sensitivity and relative risk rankings for each PCS from Table 2 (see appendix
materials) to identify the susceptibility of the drinking water source to contamination from each
PCS and take steps to reduce the risk accordingly.
We have attempted to quantify the relative susceptibility of the water system with regard to the
PCSs present in the Drinking Water Protection Area (DWPA) using Table 6.1. Across the top of
the table, each critical groundwater supply area within the DWPA (short-, intermediate-, and
long-term) is subdivided to account for areas of high, moderate, and low sensitivity that may
exist within the area. Potential contaminant source risk categories (high, moderate, and low) are
listed down the left hand side of the table. The relative aquifer susceptibility to each PCS is
demonstrated by the shading of each cell in the table. Cells that are shaded dark gray indicate a
highly-susceptible condition, light gray shaded cells indicate a moderately-susceptible condition,
and white cells indicate conditions of low susceptibility. The number in each cell indiCates the
number of potential contaminant sources that meet the conditions for that cell. Cells that do not
contain a number indicate that there are no known potential contaminant sources that meet the
conditions for the cell. Potential contaminant sources that meet the specific criteria for a cell in
Table 6.1 can be identified by reviewing Table 2 in the appendix materials. The number of
potential contaminant sources is totaled across the bottom of the table.
Table 6.1. City of Sandy Spring Susceptibility as a Function of PCS Risk and Aquifer
Sensitivity.
High Risk PCSs
Moderate Risk PCSs
Low Risk PCSs
Total PCSs
Drinking Water Protection Area
High Mod Low
!
1
2
The distribution of high, moderate, and low sensitivity areas inside the Drinking Water
Protection Area can be determined using either soil sensitivity or the mapped distribution of
Traverse Potential (TP) or Infiltration Potential (IP). In the case of the City of Sandy water
system, we have decided to rely upon the distribution of soil sensitivity since there are not
enough wells within the DWPA to make an accurate determination of the nature of the
subsurface. Therefore, the soils overlying the aquifer represent the first line of natural protection
for the aquifer.
During the potential contaminant source inventory, a total of two potential contaminant source
locations and two potential contaminant sources were identified inside the DWPA. As indicated
in the above table, both potential contaminant sources occur inside Zone 1. Of the potential
contaminant sources identified inside Zone 1, one is of moderate-risk and one is of low-risk.
Based on the analysis results shown in the relative susceptibility table, we consider the City of
Sandy to be highly susceptible to the moderate-risk potential contaminant source identified
inside Zone I (Potential contaminant Source Reference No. 5 on Figure 3, appendix materials).
Therefore we recommend that this potential contaminant source not only be addressed in
any Drinking Water Protection Plan but also in any Water System Emergency Response
Plan.
As a result of this analysis, we recommend that the water system develop a Drinking Water
Protection Plan that addresses all high- and moderate-risk potential contaminant sources within
the DWPA, beginning with. those sources which represent the greatest susceptibility risk. At a
minimum, the water system should work with representatives from those PCSs posing a
moderate- to high-susceptibility risk within the DWPA to (1) determine the level of
environmental protectiOn employed in the day-to-day operations of the facility and (2) identify
any reasonable Best Management Practices that will lead to an overall reduction of
contamination risk.
l0
6.2 Water System Susceptibility to Viral Contaminant Sources
within the Short-Term (Zone 1) Groundwater Supply Area
The DWPA identifies the short-term groundwater supply for the City of Sandy Spring, which we
consider roughly equivalent to a two-year water supply. The two-year time frame is used as a
conservative estimate of the survival time for some viruses. Based on the assessment results, the
construction of the springbox is not considered sensitive to microbial contamination; however,
the aquifer is considered sensitive to microbial contamination within the DWPA due to the
shallow, unconfined nature of the aquifer and the high Infiltration Potential Score. The
overburden thickness, the presence of fractured bedrock at the outflow, and the Specific
Conductance is unknown. Since viral contaminant sources (septic systems) have been
identified within the DWPA~ we consider the natural condition of the aquifer to be
susceptible to viral contamination. Therefore, it is in the water system's best interest to reduce
the potential for future viral contamination by complying with all Oregon Department of Human
Services setback standards related to public drinking water supply sources.
7. Conclusions
The City of Sandy water system draws water from a shallow, unconfined, layered volcanic
aquifer in the Boring Lava. Assessment results indicate that the water system would be 'highly
sensitive to a contamination event inside the identified Drinking Water Protection Area. The
presence of a couple moderate- and low-risk potential contaminant sources within the protection
area was confirmed through a potential contaminant source inventory. Under a "worst case"
scenario, where it is assumed that nothing is being done to protect groundwater quality at the
identified potential contaminant sources, the assessment results indicate that the water system
would be highly susceptible to the identified moderate-risk potential contaminant source. In
addition, the assessment results indicate that, at this time, the water system is considered
susceptible to viral contamination.
12
8. Recommended Use of the Source Water Assessment
Report
The costs associated with contaminated drinking water are high. Developing an approach to
protect that resource, such as a Drinking Water Protection Plan, can reduce the potential for
contamination of the local drinking water supply. This report contains a summary of the local
geology and springbox construction issues as they pertain to the quality of your drinking water
source. We have identified the area we believe to be most critical to preserving your water
quality (the Drinking Water Protection Area) and have identified potential sources of
contamination within that area. In addition, we provide you with recommendations, i.e., Best
Mana e~nt Practices re_ ard'm-' the _.ro .:er use and r~ces associated with some common
potential contamination sources (see appendix materials). We believe public awareness is a
powerful tool for protecting drinking water and that the information provided in this report will
help you increase local awareness regarding the relationship between land use activities and
drinking water quality. To that end, the process for developing a Drinking Water Protection Plan
can be summarized as follows:
Assessment Phase (Source Water Assessment Provided by DHS and DEQ)
· Delineate the area that serves as the source of the public water supply (Drinking Water
Protection Area (DWPA))
· Inventory the potential risks or sources of contamination within the DWPA
· Determine the areas most susceptible to contamination
Protection Phase (performed by the water system or community)
· Assemble a local Drinking Water Protection Team
· Enhance the Source Water Assessment if necessary
· Develop a plan to reduce the risk of contamination (protect the resource)
· Develop a contingency plan to address the potential loss of the drinking water supply
· Certify (optional) and implement the Drinking Water Protection Plan
The assessment phase was funded by the federal Safe Drinking Water Act. Its purpose is to
supply the water system with the information necessary to develop a Drinking Water Protection
Plan. In Oregon, development of a protection plan is voluntary.
Prior to moving into the protection phase, DEQ recommends the inventory presented in this
document be reviewed in detail to clarify the presence, location, operational practices, actual
risks, etc., of the identified facilities and land use activities. The Source Water Assessment
~WA) inventory should be regarded as a preliminary review of potential sources of
contamination within the drinking water protection area. Resources within the cormnunity
should be used to do an "enhanced inventorv" to refine this preliminary list of potential
contaminant sources. ~
It is also important to remember that not all of the inventoried activities will need to be addressed
if you choose to develop a Drinking Water Protection Plan. When developing a protection plan,
potential contaminant sources which pose little or no threat to your drinking water supply can be
screened out. For example, if any of the land use activities are conducted in a manner that
already significantly reduces the risk of a contamination release, the facility would not need 'to
re-evaluate their practices based on drinking water protection" ,,
management . One of the goals
for developing a plan based on the inventory results is to address those land use activities that do
pose high or moderate risks to your public water supply. The system should target these
facilities with greater levels of education and techniCal assistance to minimize the risk of
contamination.
Limited technical assistance is available through the DEQ and Drinking Water Program at DHS
for water systems that choose to move beyond the assessments and voluntarily develop a
Drinking Water Protection Plan. By using the results of the assessment, the water
system/community can form a Drinking Water Protection Team comprised of individuals that
have a stake in the plan's implementation.
Forming a local team to help with the development of a protection plan is very important.
Oregon's drinking water protection approach relies upon the concept of "community based
protection", as are many other water quality programs. This simply refers to the concept of
allowing local control ~d decision-making to implement the water quality protection effort.
Community-based protection is successful only with significant local citizen stakeholder
involvement. Community-based protection can draw on the knowledge and successful adaptive
practices within the area. Landowners generally know best how to achieve water resource
restoration and protection as long as a thorough explanation of the problem is provided, the
objectives to solve the problem are clearly defined, and technical assistance is available.
In community-based protection, citizens have more control and are therefore more likely to
participate in the program and be more willing to assist with the educational and outreach effort
which will make the plan successful. We recommend that the protection plan be developed so as
to minimize any burdens on individual property owners, but maximize the equity in
responsibility for reducing the risks of future contamination.
Protecting the drinking water supply in a community can also be a very effective way to
encourage all citizens to participate in issues which directly affect everyone in that community.
This often leads to more public involvement in other significant local decisions concerning
future livability issues, e.g., land use planning. In communities already developing and
·
implementing Drinking Water Protection Plans, the process has served to bring many diverse
Interests together on a common goal and strengthen the local rural and urban relationships
through communication and increased understanding. The risks and sources of water quality
problems_ are not only from industries, farmers, and managed forest, but every individual living,
commuting, and working in that area.
14
Communities/water systems interested in developing Drinking Water Protection Plans may
contact the Department of Environmental Quality (503-229-5413) or the DHS Drinking Water
Program (541-726-2587) for further,information.
Appendix Materials
References
Figures
Inventory of Potential Contaminant Sources
Well Reports and/or Source Construction Information Used 'to Determine
Local Geology
Parameters Used in Delineation Model
Groundwater Fact Sheet
BMPs for Activities Commonly found in Drinking Water Protection
Areas
Drinking Water Protection in Oregon
Source Water Assessment Methodology
Additional copies of the appendix materials are available upon written request to
the following address:
Groundwater Coordinator
Drinking Water Program
Department of Human Services
444 A Street
Springfield, OR 97477
References
Gerig, Allen J., 1985. Soil Survey of Clackamas County Area, Oregon. U.S.
Department of Agriculture and Soil Conservation Service.
Leonard, A. R. and Collins, C. A., 1983. Ground Water in the Northern Part of
Clackamas County, Oregon. Oregon Water Resources Department, Ground
Water Report No. 29.
National Oceanic and Atmospheric Administration (NOAA), 1982. Monthly Normals
of Temperature, Precipitation, and Heating and Cooling Degree Days 1951 - 80
Oregon, Climatography of the United States No. 81 (By State).
Stewart. S. and Nelson, D., 1996. Oregon Wellhead Protection Program Guidance
Manual. Oregon Department of Environmental Quality (available at
http://www.deq.state.or, us/wq/dwp/dwph°me-htm)'
Stewart, S. and Nelson, D., 1999. Oregon Source Water Assessment Plan. Oregon
Department of Environmental Quality.
17
Drinkin
City ,oflSandy Figure 1
Water Protection Area
...
Brownell S
3000 0 3000 6000 00 Feet
Drinking Water Protection Area (DWPA) 1:30,000
Local Spring Recharge Area
Topographic Mapping Method
Model Parameters
Delineation Area (mi*mi): 2.3
Usage (gal/day): 763,200
Prepared by: AP 11/4/04
Project Manager: JF RG#1867
File # 4100789
OREGON
OUADRANGL£ LOCATION
N
Spring Location: Township 2S Range 5E Section 35
Clackamas County
WGS84 Datum:
Spring 45°21"34.6,,N 122o9,14.0,,W
USGS Chen3mille' OR Quadrangle
(part 7.5' s
L \
Fig. ure 2: City. of Sandy
Potential Contam~nant Sources
Scale 1' 30,000
Drinking Water Protection Area (DWPA)
Local Spring Recharge Area
Topographic Mapping Method
4OOO
8000 Feet
Prepared by: KG 1/24/05
Project Manager: AP
Reviewed by: DN RG# 1224
File# 4100789
N
Potential Contaminant Sources(~ ~Higher Relative Risk
~] Moderate Relative Risk
/~ Low Relative Risk
Note: Sites and areas noted in this figure are
potential sources of contamination to the drinking
water identified by Oregon drinking water protection
staff. Environmental contamination is not likely to
occur when chemicals are used and managed properly.
Numbers indicate potential contaminant sources
which are explained in the Appendix.
QUADRANGLE, LOCATION
,. Figure 3:' City of Sandy
Drinking Water SoUrce Susceptibility~
(
Brown.eli
4000 ,0 4000 00 Feet
Scale 1'30,000
Drinking Water Protection Area (DWPA)
Local Spring Recharge Area
Topographic Mapping Method
Potential Contaminant Sources
(~ Higher Relative Risk
[~] Moderate Relative Risk
/~ Low Relative Risk
Sensitivity Analysis
~ High Soil Sensitivitv
,~ Medium Soil Sensitivity
'~ Low Soil Sensitivity
Note: Sites and areas noted in this figure are
potenital sources of contamination to the drinking
water as identified by Oregon Drinking Water
Protection Staff.
Environmental contamination is not likely to occur
when chemicals are used and managed properly.
N
Features or activities that are identified as high
or moderate risk that occur within an area designated as
high or moderate sensitivity pose a greater risk to drinking
water quality than those in areas of Iow sensitivity.
Numbers indicate potential contaminant sources
indexed to the Appendix.
APPENDIX C -INVENTORY OF POTENTIAL CONTAMINANT SOURCES
SANDY, CITY OF - PWS # 4100789
OREGON SOURCE WATER ASSESSMENT
Inventory Results
Table IA. Summary of Potential Contaminant Sources by Land Use for the Surface Water Source
Table lB. Summary of Potential Contaminant Sources by Land Use for the Groundwater Source
Table 2. Inventory Results - List of Potential Contaminant Sources
Notes for Tables:
were..::r~umbered seqUe~t;i:al!'~ .~;itt~: PCS refe:~e~ce ~nu;mbers ;'%J~' ~localed ::i'i~ the surface.:w~ter 'pe ~ie,~: of' the protec.don
a.r:ea: a-~d POS' ~(~;fe:re~:~ce ~numbe:rs 5~7 I.ooa:[ed. i'~ ~h'e;:grf~-d:r~:d'~'~'a:[e'r p~f(ioi~s o¢ :the. p~e(e:c~ie.n area,
Sites and areas identified in these Tables are only potential, sources of contamination to the drinking water.
Environmental contamination is not likely to occur when contaminants are used and managed properly.
Total number of sources listed in Table 1 in the DWPA may not add up to the total number of potential
contaminants sources in Table 2 because more than one 'type of potential contaminant source may be present at
any given facili~.
I f'~ ve'~:~te.¢T~' .d,~t:a.
...... · ~ 7 Col.leo~e¢ :.i~ .DS~cem:be~ '2'004:. All de[~¢~ was
Acronyms:
AST - Aboveground Storage Tank
DC - DEQ's Dry Cleaner database
DEQ - Oregon Department of Environmental Quality
DWPA - Drinking Water Protection Area
ECSI - DEQ's Environmental Cleanup Site Information database
HW IMSY - DEQ's Hazardous Waste Information Management System database
LUST - DEQ's Leaking Underground Storage Tank database
NPDES - National Pollution Discharge Elimination System
PCS- Potential Contaminant Source
PWS - Public Water System
SFM - State Fire Marshall's database of hazardous materials
SIS - DEQ's Source Information System database (includes WPCF & NPDES permits)
SWMS - DEQ's Solid Waste Management System database
UST - DEQ's Underground Storage Tank database or Underground Storage Tank
WPCF -Water Pollution Control Facility
WRD - Oregon Water Resources Division database for water rights information
12/20/2004
TABLE lA. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
SURFACE WATER SOURCE
PWS # 4100789 SANDY, CITY OF
Residential/Municipal Land Uses
Potential Contarn. ination Source Relative Total in
- Note Risk Level DWPA
Airport - Maintenance/Fueling Area
Apartments and Condominiums ._ Higher 0
Ca mpgrounds~RV Parks Lower 0
Cemeteries - Pre- 1945 - -(1) ._ --I~ower' 0
..
Drinking V~ater Treatment Plants ._ -M-oderate 0
Fire Station - . ....... Moderate 0
Fire Training Facilities -. . ......L°v~er 0
Goif Courses ........... 'Moderate 0
Housing - High Density (> 1 House/0.5 acres) Moderate' 0
Landfill/Dumps '~ Moderate 0
Lawn Care__7 .Highly Maintained Areas (1) Higher 0
Motor Pools ..... Moderate 0
__
Parks Moderate 0
Railroad Yar(~'s/Maintenance/Fueling Areas .... Moderate 0
Schools High-er' 0
Septic Systems. High Density ( > 1 system/acre) (~-) .... Lower 0
H!.gher 0
Sewer Lines - Close Proximity to PWS (1) - Higher 0
Utility Stations - Maintenance Transformer Storage
Waste Transfer/Recycling Stations Higher 0
Wastewater Treatment Plants/Collection Stations (1) Moderate 0
Other (1) Moderate 0
._
0
NOTES:
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) - Potential source of microbial contamination
(2) - Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
12/20/2004
Page 1 of 4
TABLE lA. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
SURFACE WATER SOURCE
PWS # 4100789 SANDY, CITY OF
Commercial/Industrial Land Uses Relative Total in
Potential Contamination .Sou[ce
Automobiles - Body Shops
Automobiles - Car Washes
Automobiles - Gas Stations
Automobiles - Repair Shops
.
Boat Services/Repair/Refinishing
Cement/Concrete Plants
Che'mical/Petroleum Proce_ssing-/st°rage
Dry Cleaners ..... ....
Electrical/Electronic Manufacturing
Fleet/Trucking/Bus Terminals
Food Processing
Furniture/Lumber/Parts St0~'es
Home Manufacturing
J unk/Scra p/Salvage Yards
Machine Shops ....
MedicaINet Offices
Metal Plating/Finishing/Fabrication
Mines/Gravel Pits
Office Buildings/Complexes
Parking Lots/Malls (> 50 Spaces)
Photo Processing/Printing
Plastics/Synthetics Producer
Research Laboratories _.
RV/Mini Storage
._
Wood Preserving/Treating
Wood/Pulp/Paper Processing and Mills
Other
Note
Risk Level DWPA
Higher 0
Moderate 0
Higher 0
Higher 0
Higher- 0'-
. __
Moderate 0
Highe-r,' ...... 0
Higher 0
Higher '0
Higher 0
Moderate 0
Moderate 0
.
-Higher 0
_..
._
~igher 0
Higher 0
Moderate 0
Higher 0
Higher 0
Lower 0
Higher 0
Higher 0
Higher 0
Higher 0
_.
Lower 0
Higher 0
._.
Higher 0
0
NOTES:
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)- Potential source of microbial contamination
(2) Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
12/20/2004
Page 2 of 4
TABLE lA. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
SURFACE WATER SOURCE
PWS # 4100789 SANDY, CITY OF
Agricultural/Forest Land Uses
Potential Contamination Source
Auction Lots
Boarding Stables
Confined Animal Feeding Operations (CAFOs)
._
Crops - Irrigated (inc.._.orchards, vineyards, nurseries, greenhouses)
Crops - Nonirrigated (inc. C~hristmas trees, grains, grass seed, pasture)
Farm Machinery Repair
Grazing Animals (> 5 large 'animals or equivalent]acre)
Lagoons/Liquid Wastes --
Land Application Sites -
Managed Forest Land - B~'oadcast Fertilized Areas
Managed Forest Land-- Cle--arCu~t Harvest (< 35 yrs.)
Managed Forest Land - Partial Harvest (< 10 yrs.)
Managed Forest Land - Road Density ( > 2 mi./sq, mi.)
Pesticide/FertilizedPetroleum Storage, Handling, Mixing, & Cleaning Ar
Recent Burn Areas (< 10 yrs.)
Managed Forest Lands - Status Unknown
Other
Note
(1)
(1)
(1)
(2)
(1)
(1)
Relative Total in
Risk Level DWPA
Higher 0
_
Moderate 0
Higher ..... 0
Moderate 0
__.
Lower 0
Higher -0'
Moderate 0
Higher ' 0
Moderate 0
LOwer-' '- 0
Higher 1
Moderate 0
Higher 1
Higher ..... 0
Lowe~: -0
Moderate 0
._
0
NOTES:
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) - Potential source of microbial contamination
(2) - Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
12/20/2004
Page 3 of 4
TABLE lA. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
SURFACE WATER SOURCE
PWS # 4100789 SANDY, CITY OF
Miscellaneous Land Uses
Potential Contamination Source
Above Ground Storage Tanks - Excluding Water
Channel Alterations - Heavy
Combined Sewer Outfalls
Stormwater Outfalls
Composting Facilities
Historic Gas Stations
Historic Waste Dumps/Lan(~fills
....
Homesteads - Rural- Machine Shops/Equipment Maintenance
Homesteads- Rural- Septic Systems (< 1/acre)
...
Injection/Dry Wells, Sumps - Class V UICs .........
Kennels (> 20 Pens)
Military Installations
Random Dump Sites ......
River Recreation - Heavy Use (inc. campgrounds)
Sludge Disposal Areas
Stormwater Retention Basins
Transmission Lines - Right-of-Ways
Transportation - Freeways/State Highways/Other Heavy Use Roads
Transportation- Railroads
Transportation - Right-Of-Ways - Herbicide Use Areas
Transportation - River Traffic - Heavy ...............
Transportation - Stream Crossing - Perennial- __
UST - Confirmed Leaking Tanks - DEQ List __
._
UST- Decommissioned/Inactive
UST - Nonregulated Tanks (< 1,100 gals or Large Heating Oil Tanks)
UST - Not Upgraded and/or Registered Tanks
UST - Upgraded/Registered - Active
UST - Status Unknown
Upstream Reservoirs/Dams
Wells/Abandoned Wells
Large Capacity Septic Systems (serves > 20 'People) - Class V UICs
Construction/Demolition Areas
Other: - Landslides
Relative Total in
Note Risk Level DWPA
Moderate 0
Lower 0
(1) Lower 0
_.
(1) Lower 0
(1) - Mod-~rate 0
_
Higher 0
(1) Higher 0
Higher 0
(1)(3) Lower 0
(1) Higher 0
(1) Lower 0
Higher 0
Higher 1
(1) Lower 0
(1) Moderate 0
(1) Moderate 0
Lower 0
Moderate 0
Moderate 0
Moderate 0
Lower 0
L°-We-~- 0
Higher 0
Lower 0
Higher 0
Higher 0
Lower 0
Higher 0
Lower 0
Higher 0
H) Higher 0
Moderate 0
Moderate 1
NOTES:
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) - Potential source of microbial contamination
(2) - Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
12~20~2004
Page 4 of 4
TABLE lB. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
GROUNDWATER SOURCE
PWS # 4100789 SANDY, CITY OF
Residential/Municipal Land Uses
Potential Contamination Source
Airport - Maintenance/Fueling Area
Apartments and Condominiums
cam-pgro~nds/RV Parks
Cemeteries - Pre-1945
Drinking Water Treatment Plants
Fire Station
Fire Training Facilities
Golf Courses
Housing - High Density (> 1 House/0.5 acres)
Landfill/Dumps
Lawn Care - Highly Maintained Areas
Motor Pools
Parks
Railroad Yards/Maintenance/Fueling Areas
Schools
Septic Systems - High Density ( > 1 system/acre)
Sewer Lines - Close Proximity to PWS
Utility Stations - Maintenance Transformer Storage
Waste Transfer/Recycling Stations
Wastewater Treatment Plants/Collection Stations
Other
Relative Total in
_ Note Risk Level DWPA
Higher 0
Lower 0
(1) Lower 0
Moderate 0
_ Moderate 0
__
--_.
Lower 0
__
....
..... Moderate 0
__
Moderate 0
.__
Moderate 0
(1) Higher 0
Moderate 0
Moderate 0
_
Moderate 0
_
Higher 0
Lower 0
(1) Higher 0
(1) Higher 0
Higher 0
(1) Moderate 0
(1) Moderate 0
. _ 0
NOTES:
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) - Potential source of microbial contamination
(2) -. Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
3/2 34
Page I of 4
TABLE lB. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
GROUNDWATER SOURCE
PWS # 4100789 SANDY, CITY OF
Commercial/Industrial Land Uses
Relative Total in
Potential Contamination Source
Automobiles - Body Shops
Automobiles - Car Washes
Automobiles -Ga~-'Stations
Automobiles- Repair-shops
Boat Services/Repair/Refinishing
Cement/conCrete Plants
(~hemical/Petroleum ProCessing/Storage
....
Dry Cleaners
Electrical/Electronic Manufacturing
Fleet/T-~ucking/Bus Terminals
Food Processing
Furniture/Lumber/~arts Stores
Home Manufacturing
Junk/Scrap/Salvage Yards
Machine Shops
MedicalNet Offices
Metal Plating/Finishing/Fabrication
Mines/Gravel Pits
Office Buildings/Complexes
Parking Lots/Malls (> 50 Spaces)
Photo Processing/Printing
Plastics/Synthetics Producer
Research Laboratories
RV/Mini Storage
Wood Preserving/Treating
Wood/Pulp/Paper Processing and Mills
Other
Note
Risk Level DWPA
Higher 0
Moderate 0
Higher 0
Higher 0
Higher 0
Moderate 0
'Higher" 0
_..
Higher 0
Higher 0
Higher 0
Moderate 0
Moderate 0
Higher 0
Higher 1
Higher 0
Moderate 0
Higher 0
Higher 0
Lower 0
Higher 0
Higher 0
....
Higher 0
Higher 0
Lower 0
Higher 0
Higher 0
0
NOTES:
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) - Potential source of microbial contamination
(2) - Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
12/20/2004
Page 2 of 4
TABLE lB. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
GROUNDWATER SOURCE
PWS # 4100789 SANDY, CITY OF
Agricultural/Forest Land Uses
Potential Contamination Source
- Note
Auction Lots
Boarding Stables - (1)
Confined Animal Feeding Opera-tions (CAFOs) (1-)
Crops - Irrigated (inc. orchardsi-~;~eyards,
nurseries,
greenhouses)
(2)'
Crops - Nonirrigated (inc.-c-hristmas trees, grains, grass seed, pasture)
Farm Machinery R~pair
Grazing Animals (> 5 large animals or equivalent/acre) (1)
Lagoons/Liquid wa-~tes - .--.
(1)
Land Application Sites (1~
Managed Forest L~nd. ~roadcast Fertilized Areas
Managed Forest Land - Clearcut Harvest (< 35 yrs,)- .....
Managed Forest Lar~d --~a'~tial Harvest (< 10 yrs.)
Managed Forest Land 'R~ad Density ( > 2 mi./sq, mi.)
Pesticide/Fertilizo-~Petr°~um Storage, Handling, Mixing, & Cleank~ Ar
Recent Burn Areas (< 1~ yrs.)
Managed Forest Lands --Status Unknown
Other -
__.
Relative Total in
Risk Level DWPA
Higher 0
Moderate 0
_
Higher 0
Moder~a~e 0
'Lowe[ 0
Higher 0
Moderate '0
__.
Higher 0
Modera:~e 0
--Lower-- 0'
Moderate 1
Uod~'-~te 0
Moderate 0
Higi~'r-- 0
Lower 0
Moderate 0
0
NOTES:
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 mana ged properly.
(1) - Potential source of microbial contamin ation
(2) - Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
12/20/2004
Page 3 of 4
TABLE lB. SUMMARY OF POTENTIAL CONTAMINANT SOURCES BY LAND USE FOR
GROUNDWATER SOURCE
PWS # 4100789 SANDY, CITY OF
Miscellaneous Land Uses
Relative Total in
Potential Contamination Source
Above Ground' Storage Tanks - Excluding Water
Channel Alterations - Heavy
Combined Sewer Outfalls
Stormwater Outfalls
Composting Facilities
Historic Gas Stations
. .
Historic Waste Dumps/Landfills
Homesteads - Rural- Machine-Shops/Equipment Maintenance
Homesteads - Rural - Septic SYstems (< 1/acre)
Injection/Dry Wells, SumPs - Class V UlCs
Kennels (> 20 Pens)
Military Installations
Random Dump Sites
River Recreation - Heavy Use (inc. campgrounds)
Sludge Disposal Areas
Stormwater Retention Basins
Transmission Lines- Right-of-Ways
Transportation - Freeways/State Highways/Other Heavy Use Roads
Transportation - Railroads
Transportation - Right-Of-Ways - Herbicide Use Areas
Transportation - River Traffic- Heavy
Transportation - Stream Crossing - Perennial
UST - Confirmed Leaking Tanks - DEQ' List
UST - Decommissioned/Inactive
UST - Nonregulated Tanks (< 1,100 gals or Large Heating Oil Tanks)
UST - Not Upgraded and/or Registered Tanks
UST - Upgraded/Registered - Active
UST - Status Unknown
Upstream Reservoirs/Dams
Wells/Abandoned Wells
Large Capacity Septic Systems (serves > 20 people) - Class V UICs
Construction/Demolition Areas
Other
Note Risk Level DWPA
Moderate 0
._
Lower 0
__
(1) Lower ~
....
(1) Lowe~' 0
_ _
(1) Moderate 0
Higher 0
(~) .Highe~ --0
Higher 0
(1)(3) Lower 1
H) Higher 0
(~) Lower 0
_
Higher 0
Moderate 0
(~) Lower 0
(~) Moderate 0
(1) Moderate 0
Lower. 0
Moderate 0
Moderate 0
Moderate 0
_.
Lower 0
Lower 0
Higher 0
Lower .... -0
Higher 0
Higher 0
Lower 0
Higher 0
Lower 0
Higher 0
(~) Higher 0
Moderate 0
0
NOTES:
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) - Potential source of microbial contamination
(2) - Drip irrigated crops, such as vineyards and some vegetables, are considered lower risk than spray irrigation
(3) - For groundwater public water systems, septic systems located within the 2-year time-of-travel (TOT) are
considered moderate risks.
12/20/2004
Page 4 of 4
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CLAC 57844
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STATE OF OREGON
WATER SUPPLY WELL REPORT (u r~qu~d by O~S
l~r~ctiona for ~lefing~is ~p~ n~ on ~e I~t ~a~ ~f thi~ form.
(x) o~
c~ ~'~~ - s~ 0<~ z~ ~
(3) D~LLM['rHOD:
HO~ SE~
Worded TkreMhd
M,~cri~
T.W~
(8) WELLTESTS: Minimum testing time is I hour
Flowing
Yield ll~/lldl ~)rlwdowm DFIJ] felt3 el 'rhT~e
Tcr~ocra~c ~ water_,..~'.~ Dcpth Artesian Flow Found
Liner
[]
[]
[]
START CA~ # .i 3 / 7o ~'
(9) LOCATION OF WELL by I~1 description:
County ~.~,vt~l_.~ L~tude Longitud~
smi~ 'b $ ~ I/4/K [,/.
Tax Lot ~ Lot~ Block Subdivision
Slreet A~lrcss of Well (or nearest addrets)
~sim lxessure lb. per square inch. D=*,, '
_
(11) WAi'ER BEARING ZONES:
'
Depth at which waif was tim found ~, 0
From To Estin~ted Flow
(12) WELL LOG:
Grmmd l~ev~tion
Complctcd
(unbonded) Water Well Constructm- Certification:
kie~i~ts u~l '-'-~'-"-'~'?~-'~--' :. ,-.=g .on ?atcr supply wen construction standards.
mm truorm~otl I~ ~ove ~
and belief, port~ e to the best of my knowledge
WWC Number
~igne. A _.~. D~
(bonded) Water Well Cm~ructor Certification:
~d~Y s~~ w~t ~i~ie f~ ~u~? ~ T~ li~le ~[~ ~n~s~ii.p~g.~e~~s re~~vc. Allw~
] ~.~o ~g ~s t~c u m ~im~ wi~ ~cg~ w~ su~ly wcU
ORIGINAL & FIRST COPY-WATER RESO~C~ DEPARTM~ SECOND ~PY*CONSTRU~OR THI~: COP Y-CU3~M~ '
Parameters Used in Delineation Model
Delineation Method: [] Numerical [] Hydrogeologic Mapping [] Analytic Element
[] Other: Topographic Mapping ,,.
Flow Rate (Q in gpm): ~400 gpm according to Leonard and Collins (1983},
~530 gpm according to 1999 Sanitary. Survey.
Source: [] System
[] Water Resources Dept
[] Other:_Sanitary Survey
Nature of the Aquifer:
[] Unknown
[] Semi-confined
[] Unconfined
[] Confined
Aquifer name: Layered Volcanics (Boring LaVa)
Confining Unit lithology:
Depth to Confining Unit:
Confining Unit thickness:
Depth to Aquifer:
NA
NA
NA
<100 feet
Aquifer Characteristics:
Lithology:
[] Unknown
[3 Sand
[] Gravel
[] Other:
[] Sandy Silt
[] Sand & Gravel
[] CBbbles/Gravel
[] Layered Volcanic Rocks
[] Fractured Volcanic Rocks
[] Fractured Sedimentary Rocks
Geologic Factors Controlling Spring: [] Impermeable Contact
[] Volcanic Interflow Zone
[] Fractures
[] Perched Spring
[] Other
El Unknown
Hydraulic Conductivity (Permeability): fi/day [] N/A [] Estimated from lithology [] Specific Capacity (from a nearby Well Report)
[] Published Report [] Aquifer Test
Hydraulic Gradient: [] Published Report
[] Field Measurements
Flow Direction: [] Graphical Solution
[] Model Results
[] N/A
[] Estimate
High Capacity Wells Accounted for: None