Oilwater Separator Installation Sheet Set.pdf

PDF 19 MB Posted Apr 30, 2026

Attached to: Forest Grove FMS â? ? Oil / Water Separator
Solicitation number: S-24800-00016795
Issued by: Washington County, Oregon

About this file

Written by GovTribe AI · May 19, 2026

This document is a comprehensive construction drawing set for an oil-water separator installation project at the Oregon Military Department facility located at 2900 Taylor Way in Forest Grove, Oregon. The project is overseen by Mike Hankins of the Oregon Military Department and prepared by Westech Engineering, Inc. The installation drawings include a cover sheet, vicinity and location maps, site plans, grading and drainage plans, utility plans, surfacing plans, erosion control plans, and construction details. The project encompasses existing conditions assessment, demolition plans, post-developed erosion control measures, and comprehensive construction specifications. The site covers 1.46 acres with a disturbance area of 0.01 acres. The drawings are dated November 2025 and include detailed erosion and sediment control measures with a phased construction approach spanning from site preparation through project completion and cleanup.

The construction specifications require strict compliance with Oregon Standard Specifications for Construction (OSSC/ODOT/APWA) 2018 edition and are subject to approvals by the City of Forest Grove, Clean Water Services, and Washington County. Key construction requirements include subgrade compaction to 92% maximum dry density per AASHTO T-180, granular baserock conforming to OSSC Dense Graded Base Aggregate specifications, and asphalt pavement in accordance with OSSC Hot Mixed Asphalt Concrete Pavement standards. The contractor is responsible for all required testing and inspections, utility location verification, erosion control implementation, and maintenance of temporary and permanent stabilization measures. The project requires a DEQ Certified Erosion and Sediment Control Inspector and adherence to the Oregon 1200-C Permit requirements. Site soils are identified as "Aloha Silt Loam" with slight erosion hazard per Washington County soil survey. The contractor must provide maintenance bonds where required and coordinate with all utility companies and approving agencies, with notification required a minimum of 48 business hours prior to construction commencement.

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REVIEW

FOR:

DRAWINGS FOR:

OILWATER SEPARATOR

INSTALLATION

2900 TAYLOR WAY

FOREST GROVE, OR 97116

MIKE HANKINS, OREGON MILITARY, AGI

OREGON MILITARY DEPARTMENT

(971) 283-6215 Micheal.j.hankinsiz.nfg@army.mil

Call before you dig.

Know what's below.

PROJECT

LOCATION

PROJECT

LOCATION

ELEV: 166.10' NAVD 88

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PORTLAND

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ASTORIA

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TILLAMOOK

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CLACKAMAS

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MULTNOMAH

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MARION

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LANE

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LINCOLN CITY

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NEWPORT

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FLORENCE

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EUGENE

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PACIFIC OCEAN

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SALEM

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WASHINGTON

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FOREST GROVE

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SW HIGHWAY 47

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TAYLOR WAY

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SW FERN HILL RD

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12TH AVE

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15TH AVE

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14TH AVE

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13TH AVE

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KINGWOOD ST

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LARCH ST

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16TH PL

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MAPLE ST

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WESTECH ENGINEERING, INC.

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CONSULTING ENGINEERS AND PLANNERS

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AutoCAD SHX Text 3841 Fairview Industrial Dr. S.E., Suite 100, Salem, OR 97302

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COVER SHEET, VICINITY AND LOCATION MAPS, DRAWING INDEX

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OREGON MILITARY DEPARTMENT

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OILWATER SEPARATOR INSTALLATION

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VICINITY MAP

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EROSION CONTROL DETAILS

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EROSION CONTROL NOTES

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TREES - *TREENAME* DIAMETER (INCHES)/DRIP RADIUS (FEET)

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PEDESTAL

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PED

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SIGN POST

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MONUMENT FOUND

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OH LINES

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ASSY

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BUILDING

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BLDG, BLD, BLDBLD

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YPC

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YELLOW PLASTIC CAP

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AutoCAD SHX Text TEMPORARY BENCHMARK PK SET AT THE ENTRANCE TO 2900 TAYLOR WAY, APPROXIMATELY 17.5' SOUTH OF #2900 SIGN POST ELEVATIONS ARE BASED ON GPS OBSERVATION ESTABLISHED UTILIZING ODOT ORGN

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WESTECH ENGINEERING, INC.

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CONSULTING ENGINEERS AND PLANNERS

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AutoCAD SHX Text 3841 Fairview Industrial Dr. S.E., Suite 100, Salem, OR 97302

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EXISTING CONDITIONS, EROSION CONTROL, AND DEMOLITION PLAN

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OREGON MILITARY DEPARTMENT

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OILWATER SEPARATOR INSTALLATION

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WESTECH ENGINEERING, INC.

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AutoCAD SHX Text SUPPLEMENTAL WESTECH NOTES: 1. Clearing and grading erosion control measures shall be in place prior to site disturbance. All other necessary erosion Clearing and grading erosion control measures shall be in place prior to site disturbance. All other necessary erosion control measures shall be implemented prior to starting work on the portion/phase of the project to which the measures are related. Erosion control measures shall be maintained in such a manner as to ensure that sediment and sediment-laden water does not enter the drainage system, roadways, or violate applicable water quality standards. 2. The erosion control construction, maintenance, replacement and upgrading of the erosion control facilities is the The erosion control construction, maintenance, replacement and upgrading of the erosion control facilities is the responsibility of the 1200-C Permit Registrant until all construction is completed and approved, and permanent erosion control (i.e. vegetation/landscaping) is established on all disturbed areas. 3. All recommended erosion control procedures are dependent on construction methods, staging, site conditions, weather All recommended erosion control procedures are dependent on construction methods, staging, site conditions, weather and scheduling. During the construction period, erosion control facilities shall be upgraded as necessary due to unexpected storm events and to ensure that sediment and sediment laden water does not leave the site. 4. The 1200-C Permit Registrant is responsible for control of sediment transport. If an installed erosion control system The 1200-C Permit Registrant is responsible for control of sediment transport. If an installed erosion control system does not adequately contain sediment on site, then the erosion control measures shall be adjusted or supplemented by the 1200-C Permit Registrant as necessary to ensure that sediment laden water does not leave the site. Additional measures shall be provided as required to ensure that all paved areas are kept clean for the duration of the project. Additional interim measures will include, at a minimum, installation of silt fences in accordance with the details shown on the drawings. These measures shall be installed along all exposed embankments and cut slopes to prevent sediment transport. 5. All existing and newly constructed storm inlets and drains shall be protected until pavement surfaces are completed All existing and newly constructed storm inlets and drains shall be protected until pavement surfaces are completed and/or vegetation is established. 6. Erosion control facilities and sediment fences on active sites shall be inspected by the 1200-C Permit Registrant at Erosion control facilities and sediment fences on active sites shall be inspected by the 1200-C Permit Registrant at least daily during any period with measurable precipitation. Any required repairs or maintenance shall be completed immediately. The erosion control facilities on inactive sites shall be inspected and maintained by the 1200-C Permit Registrant a minimum of once a month or within 24 hours following the start of a storm event. 7. All catch basins and conveyance lines shall be cleaned prior to paving. The cleaning operation shall not flush All catch basins and conveyance lines shall be cleaned prior to paving. The cleaning operation shall not flush sediment-laden water into the downstream system. The 1200-C Permit Registrant shall remove all accumulated sediment from all impacted catch basins and storm pipes prior to acceptance by the Owner. 8. The 1200-C Permit Registrant is solely responsible for protection of all adjacent property and downstream facilities from The 1200-C Permit Registrant is solely responsible for protection of all adjacent property and downstream facilities from erosion and siltation during project construction. Any damage resulting from such erosion and siltation shall be corrected at the sole expense of the 1200-C Permit Registrant. 9. Locate any portable toilets away from waters of the state and stormwater inlets or conveyances. Position portable toilets Locate any portable toilets away from waters of the state and stormwater inlets or conveyances. Position portable toilets so they are secure and will not be tipped or knocked over. 10. The 1200-C Permit Registrant shall provide site watering as necessary to prevent wind erosion of fine-grained soils. The 1200-C Permit Registrant shall provide site watering as necessary to prevent wind erosion of fine-grained soils. 11. Unless otherwise indicated on the drawings, all temporary erosion control facilities, including sediment fences, silt sacks, Unless otherwise indicated on the drawings, all temporary erosion control facilities, including sediment fences, silt sacks, bio-bags, etc. shall be removed within 30 days after permanent landscaping/vegetation is established. 12. Sediment fences shall be constructed of continuous filter fabric to avoid use of joints. When joints are necessary, filter Sediment fences shall be constructed of continuous filter fabric to avoid use of joints. When joints are necessary, filter cloth shall be spliced together only at a support post, with a minimum 6-inch overlap, and both ends securely fastened to a post. 13. Sediment fence shall be installed per drawing details. Sediment fences shall have adequate support to contain all silt and Sediment fence shall be installed per drawing details. Sediment fences shall have adequate support to contain all silt and sediment captured. 14. The standard strength filter fabric shall be fastened securely to stitched loops installed on the upslope side of the posts, The standard strength filter fabric shall be fastened securely to stitched loops installed on the upslope side of the posts, and 6 inches of the fabric shall be extended into the trench. The fabric shall not extend more than 30 inches above the original ground surface. Filter fabric shall not be stapled to existing trees. 15. Bio-filter bags shall be clean 100 percent wood product waste. Bags shall be 18-inch x 18-inch x 30-inch, weigh Bio-filter bags shall be clean 100 percent wood product waste. Bags shall be 18-inch x 18-inch x 30-inch, weigh approximately 45 lbs., and be contained in a bag made of 1/2-inch plastic mesh. 16. Sediment barriers shall be maintained until the up-slope area has been permanently stabilized. At no time shall more Sediment barriers shall be maintained until the up-slope area has been permanently stabilized. At no time shall more than 10-inches of sediment be allowed to accumulate behind sediment fences. No more than 2 inches of sediment shall be allowed to accumulate behind bio-filter bags. Sediment shall be removed prior to reaching the above stated depths. New sediment barriers shall be installed uphill as required to control sediment transport. 17. Stabilized construction entrances shall be installed at the beginning of construction and maintained for the duration of Stabilized construction entrances shall be installed at the beginning of construction and maintained for the duration of the project. Additional measures may be required to ensure that all paved areas are kept clean for the duration of the project. 19. The entrance shall be maintained in a condition that will prevent tracking or flow of mud onto the public right-of-way The entrance shall be maintained in a condition that will prevent tracking or flow of mud onto the public right-of-way or approved access point. The entrance may require periodic top dressing as conditions demand, and repair and/or cleanout of any structures used to trap sediment. 18. The 1200-C Permit Registrant shall verify that all trucks are well sealed when transporting saturated soils from the site. The 1200-C Permit Registrant shall verify that all trucks are well sealed when transporting saturated soils from the site. Water drippage from trucks transporting saturated soils must be reduced to less than 1 gallon per hour prior to leaving the site. 20. All materials spilled, dropped, washed, or tracked from vehicles onto roadways or into storm drains must be removed All materials spilled, dropped, washed, or tracked from vehicles onto roadways or into storm drains must be removed immediately, and protection provided for downstream inlets and catch basins to ensure sediment laden water does not enter the storm drain system. 21. Temporary grass cover measures must be fully established by October 15th, or other cover measures (i.e. erosion control Temporary grass cover measures must be fully established by October 15th, or other cover measures (i.e. erosion control blankets with anchors, 3-inches minimum of straw mulch, 6 mil HDPE plastic sheet, etc.) shall be in place over all disturbed soil areas until April 30th. To establish an adequate grass stand for controlling erosion by October 15th, it is recommended that seeding and mulching occur by September 1st. Straw mulch, if used, shall not leave any bare ground visible through the straw. 22. Minimum slope protection. For slopes steeper than 3H:1V but less than 2H:1V, use Tensar/North American Green Type Minimum slope protection. For slopes steeper than 3H:1V but less than 2H:1V, use Tensar/North American Green Type S150 erosion control blanket. For slopes 2H:1V or steeper, use Tensar/North American Green Type SC150 erosion control blanket. Use a minimum of 2-inches straw mulch or Tensar/North American Green Type S150 for slopes flatter than 3H:1V. Slope protection shall be placed on all disturbed areas immediately after completion of each section of construction activity, until the erosion control seeding has been established. As an option during temporary or seasonal work stoppages, a 6-mil HDPE plastic sheet may be placed on exposed slopes. The plastic sheet shall be provided with an anchor trench at the top and bottom of the slope, and shall be sandbagged on the slopes as required to prevent damage or displacement by wind. 23. Permanent erosion control vegetation on all embankments and disturbed areas shall be re-established as soon as Permanent erosion control vegetation on all embankments and disturbed areas shall be re-established as soon as construction is completed. 24. Soil preparation. Topsoil should be prepared according to landscape plans, if available, or recommendations of grass seed Soil preparation. Topsoil should be prepared according to landscape plans, if available, or recommendations of grass seed supplier. It is recommended that slopes be textured before seeding by rack walking (i.e. driving a crawling tractor up and down the slopes to leave a pattern of cleat imprints parallel to slope contours) or other method to provide stable areas for seeds to rest. 25. When used, hydromulch shall be applied with grass seed at a rate of 2000 lbs. per acre between April 30 and June 10, When used, hydromulch shall be applied with grass seed at a rate of 2000 lbs. per acre between April 30 and June 10, or between September 1 and October 1. On slopes steeper than 10 percent, hydroseed and mulch shall be applied with a bonding agent (tackifier). Application rate and methodology to be in accordance with seed supplier recommendations. 26. When used in lieu of hydromulch, dry, loose, weed free straw used as mulch shall be applied at a rate of 4000 lbs. per When used in lieu of hydromulch, dry, loose, weed free straw used as mulch shall be applied at a rate of 4000 lbs. per acre (double the hydromulch application requirement). Anchor straw by working in by hand or with equipment (rollers, cleat trackers, etc.). Mulch shall be spread uniformly immediately following seeding. 27. When conditions are not favorable to germination and establishment of the grass seed, the seeded and mulched areas When conditions are not favorable to germination and establishment of the grass seed, the seeded and mulched areas shall be irrigated as required to establish the grass cover. 28. Seeding. Recommended erosion control grass seed mix is as follows. Dwarf grass mix (low height, low maintenance) Seeding. Recommended erosion control grass seed mix is as follows. Dwarf grass mix (low height, low maintenance) consisting of dwarf perennial ryegrass (80 % by weight), creeping red fescue (20 % by weight). Application rate shall be 100 lbs. per acre minimum. 29. Grass seed shall be fertilized at a rate of 10 lbs. per 1000 S.F with 16- 16-16 slow release type fertilizer. Development Grass seed shall be fertilized at a rate of 10 lbs. per 1000 S.F with 16- 16-16 slow release type fertilizer. Development areas within 50 feet of water bodies and wetlands must use a non-phosphorous fertilizer. 30. Prior to starting construction the 1200-C Permit Registrant shall acquire the services of a DEQ Certified Erosion and Prior to starting construction the 1200-C Permit Registrant shall acquire the services of a DEQ Certified Erosion and Sediment Control Inspector and shall submit an "Action Plan" to DEQ identifying their names, contact information, training and experience as required in Schedule A.6.b.i-ii of the 1200-C Permit 31. The 1200-C Permit Registrant shall submit "Notice of Termination" to DEQ to end the 1200-C permit coverage once all The 1200-C Permit Registrant shall submit "Notice of Termination" to DEQ to end the 1200-C permit coverage once all soil disturbance activities have been completed and final stabilization of exposed soils has occurred. 32. If there is any conflict, discrepancy, or inconsistency between the DEQ Erosion Control Standard Notes and the If there is any conflict, discrepancy, or inconsistency between the DEQ Erosion Control Standard Notes and the Supplemental Westech Notes, the DEQ Notes will control. Last Revised: 04-29-25 (for more than 1 acre)

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1. Active period 2. Inactive periods greater than fourteen (14) consecutive calendar days 3. Periods during which the site is inaccessible due to inclement weather 4. Periods during which construction activities are suspended and runoff is unlikely due to frozen conditions. 5. Periods during which construction activities are conducted and runoff is unlikely during frozen conditions.

AutoCAD SHX Text On initial date that land disturbance activities commence. Within 24 hours of any storm event, including runoff from snow melt, that results in discharge from the site. At least once every 14 days, regardless of whether stormwater runoff is occurring. The Inspector may reduce the frequency of inspections in any area of the site where the stabilization steps in Section 2.2.20 have been completed to twice per month for the first month, no less than 14 calendar days apart, then once per month. If safe, accessible and practical, inspections must occur daily at a relevant discharge point or downstream location of the receiving waterbody. Visual monitoring inspections may be temporarily suspended. Immediately resume monitoring upon thawing, or when weather conditions make discharges likely. Visual monitoring inspections may be reduced to once a month. Immediately resume monitoring upon thawing, or when weather conditions make discharges likely.

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INSPECTION FREQUENCY FOR BMP

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SEDIMENT CONTROLS:

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AutoCAD SHX Text BMP Rationale BMP Rationale A comprehensive list of available Best Management Practices (BMP) options based on DEQ's 1200-C Permit Application and ESCP Guidance Document has been reviewed to complete this Erosion and Sediment Control Plan. Some of the above listed BMPs were not chosen because they were determined to not effectively manage erosion prevention and sediment control for this project based on specific site conditions, including soil conditions, topographic constraints, accessibility to the site, and other related conditions. As the project progresses and there is a need to revise the ESCP, an Action Plan will be submitted.

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CONTROL MEASURE

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PHASE 1

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AutoCAD SHX Text Phase 1: Prior to Ground Disturbance Prior to Ground Disturbance Phase 2: After Completion of Rough Grading Phase 3: After Installation of Storm Facilities After Installation of Storm Facilities Phase 4: After Paving & Construction Phase 5: After Project Completion and CleanupAfter Project Completion and Cleanup

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AutoCAD SHX Text SOIL TYPE(S): PER WASHINGTON CO. SOIL SURVEY THE SITE SOILS INCLUDE, "ALOHA SILT LOAM" PER WASHINGTON CO. SOIL SURVEY THE SITE SOILS INCLUDE, "ALOHA SILT LOAM" EROSION HAZARD: PER WASHINGTON CO. SOIL SURVEY EROSION HAZARD RANGES FROM "SLIGHT". PER WASHINGTON CO. SOIL SURVEY EROSION HAZARD RANGES FROM "SLIGHT". SITE AREA: 1.46 Ac 1.46 Ac DISTURBANCE AREA: 0.01 Ac

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AutoCAD SHX Text DEQ EROSION CONTROL STANDARD NOTES: 1. Include a list of all personnel (by name and position) that are responsible for the design, installation and maintenance of stormwater control measures (e.g. ESCP developer, BMP installer (see Section 4.10), as well as their individual responsibilities. (Section 4.4.c.ii) 2. Visual monitoring inspection reports must be made in accordance with DEQ 1200-C permit requirements. (Section 6.5) 3. Inspection logs must be kept in accordance with DEQ’s 1200-C permit requirements. (Section 6.5.q) s 1200-C permit requirements. (Section 6.5.q) 4. Retain a copy of the ESCP and all revisions on site and make it available on request to DEQ, Agent, or the local municipality. (Section 4.7) 5. The permit registrant must implement the ESCP. Failure to implement any of the control measures or practices described in the ESCP is a violation of the permit. (Sections 4 and 4.11) 6. The ESCP must be accurate and reflect site conditions. (Section 4.8) 7. Submission of all ESCP revisions is not required. Submittal of the ESCP revisions is only under specific conditions. Submit all necessary revision to DEQ or Agent within 10 days. (Section 4.9) 8. Sequence clearing and grading to the maximum extent practical to prevent exposed inactive areas from becoming a source of erosion. (Section 2.2.2) 9. Create smooth surfaces between soil surface and erosion and sediment controls to prevent stormwater from bypassing controls and ponding. (section 2.2.3) 10. Identify, mark, and protect (by construction fencing or other means) critical riparian areas and vegetation including important trees and associated rooting zones, and vegetation areas to be preserved. Identify vegetative buffer zones between the site and sensitive areas (e.g., wetlands), and other areas to be preserved, especially in perimeter areas. (Section 2.2.1) 11. Preserve existing vegetation when practical and re-vegetate open areas. Re-vegetate open areas when practicable before and after grading or construction. Identify the type of vegetative seed mix used. (Section 2.2.5) 12. Maintain and delineate any existing natural buffer within the 50-feet of waters of the state. (Section 2.2.4) 13. Install perimeter sediment control, including storm drain inlet protection as well as all sediment basins, traps, and barriers prior to land disturbance. (Sections 2.1.3) 14. Control both peak flow rates and total stormwater volume, to minimize erosion at outlets and downstream channels and streambanks. (Sections 2.1.1. and 2.2.16) 15. Control sediment as needed along the site perimeter and at all operational internal storm drain inlets at all times during construction, both internally and at the site boundary. (Sections 2.2.6 and 2.2.13) 16. Establish concrete truck and other concrete equipment washout areas before beginning concrete work. (Section 2.2.14) 17. Apply temporary and/or permanent soil stabilization measures immediately on all disturbed areas as grading progresses. Temporary or permanent stabilizations measures are not required for areas that are intended to be left unvegetated, such as dirt access roads or utility pole pads. (Sections 2.2.20 and 2.2.21) 18. Establish material and waste storage areas, and other non-stormwater controls. (Section 2.3.7) 19. Keep waste container lids closed when not in use and close lids at the end of the business day for those containers that are actively used throughout the day. For waste containers that do not have lids, provide either (1) cover (e.g., a tarp, plastic sheeting, temporary roof) to prevent exposure of wastes to precipitation, or (2) a similarly effective means designed to prevent the discharge of pollutants (e.g., secondary containment). (Section 2.3.7) 20. Prevent tracking of sediment onto public or private roads using BMPs such as: construction entrance, graveled (or paved) exits and parking areas, gravel all unpaved roads located onsite, or use an exit tire wash. These BMPs must be in place prior to land- disturbing activities. (Section 2.2.7) 21. When trucking saturated soils from the site, either use water-tight trucks or drain loads on site. (Section 2.2.7.f) 22. Control prohibited discharges from leaving the construction site, i.e., concrete wash-out, wastewater from cleanout of stucco, paint and curing compounds. (Sections 1.5 and 2.3.9) 23. Ensure that steep slope areas where construction activities are not occurring are not disturbed. (Section 2.2.10) 24. Prevent soil compaction in areas where post-construction infiltration facilities are to be installed. (Section 2.2.12) 25. Use BMPs to prevent or minimize stormwater exposure to pollutants from spills; vehicle and equipment fueling, maintenance, and storage; other cleaning and maintenance activities; and waste handling activities. These pollutants include fuel, hydraulic fluid, and other oils from vehicles and machinery, as well as debris, fertilizer, pesticides and herbicides, paints, solvents, curing compounds and adhesives from construction operations.(Sections 2.2.15 and 2.3) 26. Provide plans for sedimentation basins that have been designed per Section 2.2.17 and stamped by an Oregon Professional Engineer. (See Section 2.2.17.a) 27. If engineered soils are used on site, a sedimentation basin/impoundment must be installed. (See Sections 2.2.17 and 2.2.18) 28. Provide a dewatering plan for accumulated water from precipitation and uncontaminated groundwater seepage due to shallow excavation activities. (See Section 2.4) 29. Implement the following BMPs when applicable: written spill prevention and response procedures, employee training on spill prevention and proper disposal procedures, spill kits in all vehicles, regular maintenance schedule for vehicles and machinery, material delivery and storage controls, training and signage, and covered storage areas for waste and supplies. (Section 2.3) 30. Use water, soil-binding agent or other dust control technique as needed to avoid wind-blown soil. (Section 2.2.9) 31. The application rate of fertilizers used to reestablish vegetation must follow manufacturer’s recommendations to minimize nutrient s recommendations to minimize nutrient releases to surface waters. Exercise caution when using time-release fertilizers within any waterway riparian zone. (Section 2.3.5) 32. If an active treatment system (for example, electro-coagulation, flocculation, filtration, etc.) for sediment or other pollutant removal is employed, submit an operation and maintenance plan (including system schematic, location of system, location of inlet, location of discharge, discharge dispersion device design, and a sampling plan and frequency) before operating the treatment system. Obtain Environmental Management Plan approval from DEQ before operating the treatment system. Operate and maintain the treatment system according to manufacturer’s specifications. (Section 1.2.9) s specifications. (Section 1.2.9) 33. Temporarily stabilize soils at the end of the shift before holidays and weekends, if needed. The registrant is responsible for ensuring that soils are stable during rain events at all times of the year. (Section 2.2) 34. As needed based on weather conditions, at the end of each workday soil stockpiles must be stabilized or covered, or other BMPs must be implemented to prevent discharges to surface waters or conveyance systems leading to surface waters. (Section 2.2.8) 35. Sediment fence: remove trapped sediment before it reaches one third of the above ground fence height and before fence removal. (Section 2.1.5.b) 36. Other sediment barriers (such as biobags): remove sediment before it reaches two inches depth above ground height and before BMP removal. (Section 2.1.5.c) 37. Catch basins: clean before retention capacity has been reduced by fifty percent. Sediment basins and sediment traps: remove trapped sediments before design capacity has been reduced by fifty percent and at completion of project. (Section 2.1.5.d) 38. Within 24 hours, significant sediment that has left the construction site, must be remediated. Investigate the cause of the sediment release and implement steps to prevent a recurrence of the discharge within the same 24 hours. Any in-stream clean-up of sediment shall be performed according to the Oregon Department of State Lands required timeframe. (Section 2.2.19.a) 39. The intentional washing of sediment into storm sewers or drainage ways must not occur. Vacuuming or dry sweeping and material pickup must be used to cleanup released sediments. (Section 2.2.19) 40. Document any portion(s) of the site where land disturbing activities have permanently ceased or will be temporarily inactive for 14 or more calendar days. (Section 6.5.f.) 41. Provide temporary stabilization for that portion of the site where construction activities cease for 14 days or more with a covering of blown straw and a tackifier, loose straw, or an adequate covering of compost mulch until work resumes on that portion of the site. (Section 2.2.20) 42. Do not remove temporary sediment control practices until permanent vegetation or other cover of exposed areas is established. Once construction is complete and the site is stabilized, all temporary erosion controls and retained soils must be removed and disposed of properly, unless needed for long term use following termination of permit coverage. (Section 2.2.21) Rev. 12/15/20 By: Blair Edwards

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WESTECH ENGINEERING, INC.

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CONSULTING ENGINEERS AND PLANNERS

AutoCAD SHX Text Phone: (503) 585-2474 Fax: (503) 585-3986

AutoCAD SHX Text 3841 Fairview Industrial Dr. S.E., Suite 100, Salem, OR 97302

AutoCAD SHX Text E-mail: westech@westech-eng.com

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EROSION CONTROL NOTES

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OREGON MILITARY DEPARTMENT

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OILWATER SEPARATOR INSTALLATION

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NOV 2025

WESTECH ENGINEERING, INC.

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CONSULTING ENGINEERS AND PLANNERS

AutoCAD SHX Text Phone: (503) 585-2474 Fax: (503) 585-3986

AutoCAD SHX Text 3841 Fairview Industrial Dr. S.E., Suite 100, Salem, OR 97302

AutoCAD SHX Text E-mail: westech@westech-eng.com

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