Report (5) s r;vo c, ��3
voS-c Sw //572-1p/
CleanWaterr Services
Our commilmcnt is clear. CWS File Numberl5-002570
Service Provider Letter 15-002570
This form and the attached conditions will serve as your Service Provider Letter in accordance
with Clean Water Services Design and Construction Standards (R&O 07-20).
Jurisdiction: Tigard Review Type: No Impact
Site Address 14059 SW 119th PL SPL Issue Date: September 22,2015
I Location: Tigard, OR 97224 SPL Expiration Date: September 21, 2017
Applicant Information: Owner Information:
Name Name
Company ATRIUM HOMES Company ATRIUM HOMES
15020 SW 149TH AVE 15020 SW 149TH AVE
Address Address
PORTLAND OR 97224 PORTLAND OR 97224
Phone/Fax Phone/Fax
E-mail: E-mail:
Tax lot ID Development Activity
2S110BB00100 Building and Garage
Pre-Development Site Conditions: Post Development Site Conditions:
Sensitive Area Present: I I On-Site X Off-Site Sensitive Area Present: n On-Site n Off-Site
Vegetated Corridor Width: Variable Vegetated Corridor Width: Variable
Vegetated Corridor Condition: Degraded
Enhancement of Remaining
Vegetated Corridor Required: 1 5 I Square Footage to be enhanced: 6,749
Encroachments into Pre-Development Vegetated Corridor:
Type and location of Encroachment: Square Footage:
None 0
Mitigation Requirements:
Type/Location Sq. Ft./Ratio/Cost
No Mitigation Required 0
X Conditions Attached 1 i I Development Figures Attached(2) ❑Planting Plan Attached nGeotech Report Required
This Service Provider Letter does NOT eliminate the need to evaluate and protect water quality
sensitive areas if they are subsequently discovered on your property.
Page 1 of 5
r
CWS File Number 15-002570
In order to comply with Clean Water Services water quality protection
requirements the project must comply with the following conditions:
1. No structures, development, construction activities, gardens, lawns, application of chemicals,
uncontained areas of hazardous materials as defined by Oregon Department of Environmental
Quality, pet wastes, dumping of materials of any kind, or other activities shall be permitted
within the sensitive area or Vegetated Corridor which may negatively impact water quality,
except those allowed in R&O 07-20, Chapter 3.
2. Prior to any site clearing, grading or construction the Vegetated Corridor and water quality
sensitive areas shall be surveyed, staked, and temporarily fenced per approved plan. During
construction the Vegetated Corridor shall remain fenced and undisturbed except as allowed by
R&O 07-20, Section 3.06.1 and per approved plans.
3. Prior to any activity within the sensitive area,the applicant shall gain authorization for
the project from the Oregon Department of State Lands (DSL) and US Army Corps of
Engineers (USAGE). The applicant shall provide Clean Water Services or its designee
(appropriate city)with copies of all DSL and USACE project authorization permits.
4. An approved Oregon Department of Forestry Notification is required for one or more trees
harvested for sale, trade, or barter, on any non-federal lands within the State of Oregon.
5. Prior to ground disturbance an erosion control permit is required. Appropriate Best
Management Practices (BMP's)for Erosion Control, in accordance with Clean Water
Services' Erosion Prevention and Sediment Control Planning and Design Manual,shall
be used prior to, during, and following earth disturbing activities.
6. Prior to construction, a Stormwater Connection Permit from Clean Water Services or its
designee is required pursuant to Ordinance 27, Section 4.B.
7. Activities located within the 100-year floodplain shall comply with R&O 07-20, Section 5.10.
8. Removal of native, woody vegetation shall be limited to the greatest extent practicable.
9. Should final development plans differ significantly from those submitted for review by
Clean Water Services,the applicant shall provide updated drawings, and if necessary,
obtain a revised Service Provider Letter.
SPECIAL CONDITIONS
10. The Vegetated Corridor width for sensitive areas within the project site shall be a minimum of
50 feet wide, as measured horizontally from the delineated boundary of the sensitive area.
11. For Vegetated Corridors up to 50 feet wide, the applicant shall enhance the entire Vegetated
Corridor to meet or exceed good corridor condition as defined in R&O 07-20, Section 3.14.2,
Table 3-3.
12. Prior to any site clearing, grading or construction, the applicant shall provide Clean Water
Services with a Vegetated Corridor enhancement/restoration plan. Enhancement/restoration of
the Vegetated Corridor shall be provided in accordance with R&O 07-20, Appendix A.
13. Prior to installation of plant materials, all invasive vegetation within the Vegetated Corridor shall
be removed per methods described in Clean Water Services' Integrated Pest Management
Plan. During removal of invasive vegetation care shall be taken to minimize impacts to existing
native tree and shrub species.
14. Clean Water Services shall be notified 72 hours prior to the start and completion of
enhancement/restoration activities. Enhancement/restoration activities shall comply with the
guidelines provided in Landscape Requirements (R&0 07-20, Appendix A).
15. Maintenance and monitoring requirements shall comply with R&O 07-20, Section 2.11.2.
If at any time during the warranty period the landscaping falls below the 80%survival
level,the owner shall reinstall all deficient planting at the next appropriate planting
opportunity and the two year maintenance period shall begin again from the date of
replanting.
Page 2 of 5
•
CWS File Number 15-002570 1
16. Performance assurances for the Vegetated Corridor shall comply with R&O 07-20,
Section 2.06.2.
17. Clean Water Services may require an easement over the Vegetated Corridor conveying
storm and surface water management to Clean Water Services or the City that would
prevent the owner of the Vegetated Corridor from activities and uses inconsistent with
the purpose of the corridor and any easements therein.
FINAL PLANS
18. Final construction plans shall include landscape plans. In the details section of the plans,
a description of the methods for removal and control of exotic species, location, distribution,
condition and size of plantings, existing plants and trees to be preserved, and installation
methods for plant materials is required. Plantings shall be tagged for dormant season
identification and shall remain on plant material after planting for monitoring purposes.
19. A Maintenance Plan shall be included on final plans including methods, responsible party
contact information, and dates (minimum two times per year, by June 1 and September 30).
20. Final construction plans shall clearly depict the location and dimensions of the sensitive
area and the Vegetated Corridor(indicating good, marginal, or degraded condition).
Sensitive area boundaries shall be marked in the field.
This Service Provider Letter is not valid unless CWS-approved site plan is attached.
Please call (503) 681-3653 with any questions.
Amber Wierck
Environmental Plan Review
Attachments(2)
Page 3 of 5