5000 Acres Initiative at PCC Sylvania in Portland OR

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Project Contacts PROJECT ORIGINATOR AND FISCAL SPONSOR Brian Wegener, Advocacy & Communications Manager Tualatin Riverkeepers 675 SW Hazelbrook Rd, Tualatin, OR 97062 brian@tualatinriverkeepers.

edu (97) 722-4226 FUNDING PARTNER Avis Newell, TMDL Basin Coordinator, Tualatin Subbasin Oregon Department of Environmental Quality (DEQ) 2020 SW 4th Avenue, Suite 400, Portland, OR 9720 newell.

1 Project Contacts PROJECT ORIGINATOR AND FISCAL SPONSOR Brian Wegener, Advocacy & Communications Manager Tualatin Riverkeepers 675 SW Hazelbrook Rd, Tualatin, OR (503) COLLEGE LIASON Dieterich Steinmetz, MD, Dean of Science & Engineering Portland Community College, Sylvania Campus 2000 SW 49th Avenue, Portland, OR 9729 (97) FUNDING PARTNER Avis Newell, TMDL Basin Coordinator, Tualatin Subbasin Oregon Department of Environmental Quality (DEQ) 2020 SW 4th Avenue, Suite 400, Portland, OR 9720 (503) TECHNICAL PROJECT MANAGER & SUSTAINABILITY CONSULTANT Maria Cahill, Principal & Sustainable Site Specialist 224 SE Woodward Street, Portland, OR (503) CIVIL ENGINEER John Howorth, P.E., Principal Engineer 3J Consulting, Inc SW Canyon Road,, Suite 245, Beaverton, OR (503) GEOTECHNICAL ENGINEER John Cunningham, P.E., Principal Engineer Alder Geotechnical Services, LLC 390 NE 0th Avenue, Portland, OR 9722 (503) PAVEMENT REMOVAL PARTNER Josh Cabot, Volunteer Depave (97) CONTRACTOR To be determined Stormwater Management Data PROJECT ADDRESS: PCC SYLVANIA CAMPUS 2000 SW 49th AVE, PORTLAND, OR 9729 PROJECT TYPE: VOLUNTARY DEMONSTRATION RETROFIT BRIEF DESCRIPTION: INFILTRATION TREE WELL ESTIMATED DRAINAGE AREA MANAGED: 99 SF PARKING LOT 754 SF SIDEWALK 65 SF <50% GRASS COVER, HSG C 285 SF WOODS, GOOD, HSG C ESTIMATED INFILTRATION AREA: 408 SF FIELD TESTED INFILTRATION RATE AND DESIGN RATE: INCH/HOUR Project Description THIS PROJECT DEMONSTRATES A NOVEL ASSEMBLY OF TIME-TESTED MATERIALS TO INCORPORATE HEALTHY TREES INTO PARKING LOTS WITHOUT LOSING PARKING SPACES. THIS ASSEMBLY IS NOVEL BECAUSE IN MANY PREVIOUS PROJECTS WHERE STRUCTURAL SOIL HAS BEEN USED:. TREES HAVE BEEN PLACED IN ISLANDS ALONGSIDE PARKING SPACES OR IN ISLANDS BETWEEN DRIVING LANES (EXAMPLE: NAITO PARKWAY). 2. TREES ARE THE FOCUS WITH LITTLE TO NO REGARD FOR STORMWATER MANAGEMENT OPPORTUNITIES VIA INFILTRATION. TYPICALLLY, NATIVE SOILS ARE EXCAVATED TO A DEPTH OF 3 FEET, THE BOTTOM OF THE TRENCH IS HEAVILY COMPACTED, AND THE TRENCH IS BACKFILLED WITH STRUCTURAL TREE SOIL. FOR OUR PROJECT, A GEOTECHNICAL ENGINEER HAS BEEN ENGAGED TO RECOMMEND A PAVEMENT SECTION, BASED ON LABORATORY TESTING AND FIELD INVESTIGATION THAT WILL SUPPORT VEHICULAR LOADS, ON A WET, UNCOMPACTED NATIVE SOIL CONDITION, WHICH WILL REDUCE RUNOFF THROUGH INFILTRATION. WE WANT TO STUDY IF:. SHEET FLOW RUNOFF FROM ABOVE THE TREE WELL ASSEMBLY WILL FLOW INTO A 4-FOOT WIDE PLANTER STRIP AND SPREAD THROUGHOUT A SUBSURFACE FOOT WIDE TRENCH TO INFILTRATE INTO THE NATIVE SUBSOIL. 3. WITH ADEQUATE SOIL VOLUME IN A 2-FOOT WIDE TRENCH, TREE CANOPY WILL BE SIMILAR FOR ALL THREE TREES, EVEN THOUGH ONE TREE IS LOCATED COMPLETELY IN NATIVE SOIL IN THE PLANTER. 4. WATER QUALITY IS IMPROVED FROM THIS MODEST DRAINAGE AREA. Sheet List SC0.0 SC.0 SC2.0 SC3.0 SC4.0 SC5. SC5.2 COVER SHEET CONDITIONS SITE PLAN GRADING AND EROSION PREVENTION & SEDIMENT CONTROL PLAN UTILITY PLAN DETAILS DETAILS PROJECT LOCATION Location Map NTS SC0.0: COVER SHEET

Notes. PER CONVERSATION WITH JOHN GWALTNEY-BEAUMONT, AN ARBORIST AND STAFF AT PCC SYLVANIA, THESE SHRUBS/ARBORESCENT TREES ARE AMELANCHIERS AND CAN HOST RUST. JOHN WOULD PREFER IF THESE WERE REMOVED.

2 Notes. PER CONVERSATION WITH JOHN GWALTNEY-BEAUMONT, AN ARBORIST AND STAFF AT PCC SYLVANIA, THESE SHRUBS/ARBORESCENT TREES ARE AMELANCHIERS AND CAN HOST RUST. JOHN WOULD PREFER IF THESE WERE REMOVED. 2. FENCE OFF AREAS AS NEEDED. DO NOT STOCKPILE MATERIALS UNDER TREE CANOPY/DRIPLINES. SEE SHEET SC3.0 GRADING PLAN FOR STOCKPILE LOCATIONS. 3. INFORMATION USED FOR DESIGN WAS DRAFTED FROM AERIAL PHOTOGRAPHY FROM 4. CONTOUR DATA IS FOR GENERAL INFORMATION ONLY. THE SITE HAS NOT BE SURVEYED. CONTRACTOR TO FIELD VERIFY ALL ELEVATIONS. TREES AND LANDSCAPE AREAS TO BE PROTECTED, TYP SEE NOTE 2 CURB TO BE PROTECTED CATCH BASIN INLET L STREET PAVEMENT MARKINGS LOT 0 SHRUBS/ARBORESCENT TREES TO BE REMOVED, SEE NOTE CONTOUR SEE NOTE 3 CURB TO BE REMOVED " = 60' 0 30' 60' As Built Excerpt - Lot 0 " = 60' " = 20' 0 0' 20' CURB TO BE PROTECTED, TYP. Existing Conditions " = 20' SIDEWALK TO BE PROTECTED SC.0: CONDITIONS

3 Tree Well Construction Sequence. SAWCUT AND REMOVE 2' WIDE NIC SWATH OF ASPHALT PAVEMENT AND BASE ROCK CENTERED 6' ON THE PAINTED LINE WHERE PARKING SPACES MEET HEAD TO HEAD. 2. EXCAVATE ADDITIONAL DEPTH AS SHOWN IN DETAILS (27" MINIMUM, BUT DEPENDS ON ASPHALT DEPTH & GRADES). 3. FINE GRADE THESE AREAS AS SHOWN ON DETAILS. 4. STOCKPILE NATIVE SOIL MATERIALS AWAY FROM STORM DRAINS USING APPROPRIATE EROSION PREVENTION & SEDIMENT CONTROL MEASURES SUCH AS COMPOST SOCK OR WATTLE AT THE BASE. COVER WITH JUTE FABRIC AS NEEDED TO PROTECT AGAINST WIND EROSION. DO NOT SUBSTITUTE PLASTIC SHEETING. 5. AMEND STOCKPILED SOILS: HAND SPREAD PERMAMATRIX AT A RATE OF 50 LB/500 SF OF AREA AND GEOHUMUS AT A RATE OF LB/000 SF (BOTH FROM SUNMARK ENVIRONMENTAL OR EQUIVALENT ) OVER THE TOP OF THE NATIVE SOIL STOCKPILE. SPREAD COMPOST (CLACKAMAS COMPOST PRODUCTS "PREMIUM MULCH OR EQUIVALENT) OVER STOCKPILE IN A VOLUME THAT WHEN ROTOTILLED OR SHOVELED TOGETHER WILL YEILD A MIX OF PART COMPOST TO 2 PARTS SOIL. 6. INSTALL CATCH BASIN AND PERFORATED PIPE (OUTLET MONITORING ASSEMBLY )PER DETAILS 2/SC5. AND /SC AMEND SOILS AT THE BOTTOM OF THE WIDE PLANTING TRENCH: ROTOTILL OR LOOSEN WITH SHOVEL TO A DEPTH OF 2". PLACE 3" OF COMPOST AND ROTOTILL OR SHOVEL MIX INTO SOIL TO A DEPTH OF 8". 8. ROTOTILL COMPACTED SOILS BENEATH PROPOSED WIDE ASPHALT PAVEMENT TO LOOSEN THEM. 9. PROTECT AGAINST CLOGGING. IF TRENCH OR STOCKPILED SOILS WILL BE EXPOSED TO ANY RAINFALL, COVER THEM WITH JUTE FABRIC UNTIL THE NEXT STEP IS IMPLEMENTED. 0. REMOVE JUTE FABRIC/CLOGGING PROTECTION FROM BOTTOM, AND PLACE FIRST 8" LIFT OF STRUCTURAL SOIL IN AREAS SHOWN ON SITE PLAN AND DETAILS.. PLACE FIRST 8" LIFT OF COMPOST AMENDED NATIVE SOIL IN PLANTING STRIP. 2. LIGHTLY COMPACT STRUCTURAL SOIL PER SPECIFICATIONS. DO NOT OVER COMPACT. 3. LIGHTLY BOOT COMPACT AREA OF AMENDED NATIVE SOIL. 4. PLACE SECOND 8" LIFT OF STRUCTURAL SOIL OVER PREVIOUS LIFT. 5. PLACE SECOND 8" LIFT OF COMPOST AMENDED NATIVE SOIL OVER PREVIOUS LIFT. 6. LIGHTLY COMPACT STRUCTURAL SOIL PER Tree Well Construction Sequence (cont.) 6. LIGHTLY COMPACT STRUCTURAL SOIL PER SPECIFICATIONS. DO NOT OVER COMPACT. 7. LIGHTLY BOOT COMPACT AREA OF AMENDED NATIVE SOIL. 8. PLACE FINAL LIFT OF STRUCTURAL SOIL OVER PREVIOUS LIFT TO DEPTH NEEDED SO THAT THE DEPTH OF PROPOSED ASPHALT WILL EQUAL THE AND CAN BE INSTALLED TO MEET AND MATCH GRADES. 9. PLACE FINAL LIFT OF COMPOST AMENDED NATIVE SOIL OVER PREVIOUS LIFT TO WITHIN 3.25" OF FINISH GRADE. 20. LIGHTLY COMPACT STRUCTURAL SOIL PER SPECIFICATIONS. DO NOT OVER COMPACT. 2. LIGHTLY BOOT COMPACT AREA OF AMENDED NATIVE SOIL. 22. PLACE IMPERVIOUS ASPHALT IN AREAS SHOWN NIC ON PLANS AND DETAILS. 23. PLACE 3" OF CRUSHED ROCK MULCH IN PLANTING STRIP. 25. CONSTRUCT LEVEL SPREADER OVERFLOW PER PLAN AND 2/SC5/ PLANT TREES IN OCTOBER. NIC Legend Notes PAVEMENT: ASPHALT PAVEMENT OVER STRUCTURAL SOIL, SEE NOTE 2 PLANTING STRIP: ROCK MULCH OVER AMENDED PLANTING SOIL. PROPOSED TREES INSIDE AND OUT OF THE NIC TREE WELL WILL BE DETERMINED AT THE TIME OF PLANTING IN THE FALL, BUT SHALL BE ONE OF THE FOLLOWING: A. Pseudotsuga menziesii B. Pseudotsuga menziesii var glauca C. Tsuga heterophylla vs mertensiana D. Thuja plicata Fastigiata 2. EXCEPT AS SHOWN, THE DIMENSION AND ARRANGEMENT OF PARKING SPACES AND AISLES SHALL NOT CHANGE FROM. 3. STRIPING OVER PROPOSED ASPHALT AREAS TO NIC MATCH IN STYLE, COLOR, AND MATERIAL. L STREET " = 20' 0 0' 20' PROPOSED NATIVE CONIFEROUS TREE, 5-6 FEET HIGH, SEE NOTE, TYP EQUAL EQUAL ALIGN TRUNK ALIGN TRUNK LEVEL SPREADER PER DETAIL 2/SC5.2 Site Plan " = 20' 7' 2' 2' 6' 8' 2' 6' CONCRETE WHEEL STOP, TYP EXTENT OF STRUCTURAL TREE SOIL AREA SC2.0: SITE PLAN LOT 0 FINAL PAVED DEPTH FINAL PARKING DEPTH = 2' OVERHANG, EACH SIDE 2'

4 Legend SLOPE = FINAL, PROPOSED SLOPE BIOBAG INLET PROTECTION FOR NEXT DOWNHILL BIOBAG (AT INTERSECTION) WATTLES, OVERLAP EDGES AT LEAST 2" AT ENDS, STAKE DOWN IN LANDSCAPE AREAS BIOBAG INLET PROTECTION SWEEP PAVEMENT CLEAN AT THE END OF EVERY WORK DAY NATIVE SOIL STOCKPILE, SEE NOTE 2 Notes JUTE FABRIC, SEE NOTES 2 AND 3. FINISH GRADES IN PAVEMENT AREAS SHALL BE RESTORED TO GRADES. 2. STOCKPILE NATIVE SOIL TO A MAXIMUM HEIGHT OF 3 FEET, ON TARPS; COVER WITH JUTE FABRIC WHEN NOT IN USE. 3. USE JUTE FABRIC DURING CONSTRUCTION AND/OR OVERNIGHT TO PROTECT THE BOTTOM OF TRENCH FROM EXPOSURE TO RAIN, SINCE THIS CAN CLOG THE FACILITY. 4. REFER TO CITY OF PORTLAND TITLE 0 CODE FOR EROSION PREVENTION AND SEDIMENT CONTROL REQUIREMENTS, INCLUDING THAT NO VISIBLE SEDIMENT SHALL LEAVE THE SITE. 5. THE CONTRACTOR IS RESPONSIBLE FOR LOCATING ALL UTILITIES BEFORE DIGGING. L STREET TARP TO PROTECT PAVEMENT, TYP FINISH GRADE IN PLANTING STRIP = GRADE MINUS /4 INCH LEVEL SPREADER.TO REDUCE EROSION FROM WEIR OVERFLOWS, BUILD ALONG CONTOUR SO THAT THE CENTERLINE SLOPE = COMPOST AMENDMENT STOCKPILE " = 20' 0 0' 20' Grading & Erosion Prevention & Sediment Control Plan " = 20' SC3.0: GRADING & EP&SC PLAN

5 0 5' 0' " = 0' 3' W x 6" D x 5' L LEVEL SPREADER TO MANAGE WEIR OVERFLOW PER DETAIL 2/SC LF 8" DIA HDPE SOLID PIPE, PARTIALLY PERFORATED PER DETAIL 2/SC5. AND /SC5.2. CAP END. D D' C' C B' B A' A INSTALL THIS WHEEL STOP SLIGHTLY OFF-CENTER OF PARKING SPACE TO ALLOW ACCESS INTO CATCH BASIN FOR MONITORING PURPOSES LOT 0 OUTLET SAMPLING ACCESS: 2'X2' CONCRETE CATCH BASIN WITH SOLID LID AND 8" DEEP SUMP PER DETAIL 2/SC5.. ORDER OR FIELD CUT A 3" TALL WEIR SLOT ON WEST SIDE FOR OVERFLOW INTO LEVEL SPREADER PER DETAIL 2/SC4.0. RIM EL = FLUSH WITH ADJACENT ASPHALT PAVEMENT (ASSUMED ELEVATION: 00.00) IE OUT (W, WEIR SLOT) = IE IN (S, 8" PERFORATE PIPE) = Utility Plan " = 0' COMPACTED DURING INSTALLATION OF UTILITIES. TO ENSURE THAT THE BOTTOM OF THE FACILITY IS NOT Notes UTILITIES SHALL BE LOCATED BEFORE DIGGING BEGINS. SOME EQUIPMENT HAS BEEN INCLUDED FOR WATER QUALITY MONITORING. REFER TO CONSTRUCTION SEQUENCE ON SC2.0 SITE PLAN WEIR SLOT OUTLET DRAINS TO LEVEL SPREADER IN LANDSCAPE ISLAND NOTES:. SEE OTHER DETAILS AND PLANS FOR INFORMATION ON CONFIGURATION AND SPECIFICATIONS FOR CATCH BASIN ELEMENTS OTHER THAN THE WEIR OUTLET. Catch Basin Wier Outlet NTS SC4.0: UTILITY PLAN ASPHALT PAVEMENT PLANTER STRIP

6 3" CRUSHED /4"x0 ROCK MULCH (VALLEY LANDSCAPE CENTER OR EQUIVALENT (503) ). DEPRESSED NO MORE THAN /4" BELOW ADJACENT PAVEMENT EDGES 6"W X 6"H X 6'L CONCRETE WHEEL STOP SECURED WITH REBAR, TYP IMPERVIOUS PAVEMENT & BASE ROCK TO BE LEFT UNDISTURBED, TYP 45 MIL EPDM IMPERMEABLE BARRIER (FOUND AT ROOFING SUPPLY COMPANIES) PLACED TO A DEPTH OF AT LEAST 6" BELOW BOTTOM OF BASE ROCK, ALL SIDES THAT ABUT IMPERVIOUS PAVEMENT, SEE NOTE NOTES:. IMPERMEABLE BARRIER INSTALLED TO PROTECT IMPERVIOUS PAVEMENT FROM WATER DAMAGE DUE TO UNDERCUTTING FROM STORMWATER IN TREE WELL. OVERLAP ENDS 8" MINIMUM. IMPERVIOUS PAVEMENT TO BE LEFT UNDISTURBED PAVE- MENT 8" MAX, TYP PLANTER STRIP PAVE- MENT STRUCTURAL SOIL, BENEATH ALL FINAL AREAS OF ASPHALT, TYP. LINE OF STRUCTURAL SOIL LIFTS DURING SOIL PLACEMENT Infiltration Tree Well - Section A-A' /4" = ' PROPOSED TREE IN LANDSCAPE ISLAND 3" CRUSHED /4"x0 ROCK MULCH (VALLEY LANDSCAPE CENTER OR EQUIVALENT (503) ). DEPRESSED NO MORE THAN /4" BELOW ADJACENT PAVEMENT EDGES STRUCTURAL SOIL, BENEATH ALL FINAL AREAS OF ASPHALT, TYP. 2'X2' CONCRETE CATCH BASIN INLET WITH SOLID LID AND 8" SUMP EXTEND PIPE INTO CATCH BASIN FOR WATER QUALITY SAMPLING PAVEMENT LINE OF STRUCTURAL SOIL LIFTS DURING SOIL PLACEMENT 24" MIN PLANTER STRIP PAVEMENT NIC PROPOSED TREE IN PLANTER STRIP ASPHALT TO BE RE-INSTALLED TO MATCH ASPHALT DEPTH OR A MINIMUM DEPTH OF 3", TYP. DIRECTION OF RUNOFF FLOW BOTTOM OF TREE WELL, SLOPE = IN THE NORTH-SOUTH DIRECTION 2H:V ANGLE OF REPOSE OF STRUCTURAL SOIL OF 8" LIFTS COMPOST AMENDED NATIVE SOIL, SEE CONSTRUCTION SEQUENCE UNCOMPACTED NATIVE SOIL IMPERVIOUS ASPHALT TO BE PROTECTED DIRECTION OF RUNOFF FLOW BOTTOM OF TREE WELL, SLOPE = IN THE NORTH-SOUTH DIRECTION IMPERMEABLE LINER PER DETAIL 2/SC5.2 2H:V ANGLE OF REPOSE OF STRUCTURAL SOIL OF 8" LIFTS COMPOST AMENDED NATIVE SOIL, SEE CONSTRUCTION SEQUENCE Outlet Monitoring Assembly - Section B-B' /4" = ' 0.25' ASPHALT TO BE RE-INSTALLED TO MATCH ASPHALT DEPTH OR A MINIMUM DEPTH OF 3", TYP LF 8" DIA HDPE SOLID PIPE WITH SLOTS FIELD CUT ON TOP HALF ONLY, S = , WITH END CAP, SURROUNDED BY SAME OPEN-GRADED (I.E. ALL THE SAME SIZE) CRUSHED ROCK USED IN PLANTER STRIP Compost Specifications COMPOST SHALL BE SUPPLIED BY A U.S. COMPOST COUNCIL SEAL OF TESTING ASSURED (STA) PROGRAM SUPPLIER (CLACKAMAS COMPOST PRODUCTS "PREMIUM GARDEN MULCH" OR EQUIVALENT). REVIEW THE MOST RECENT TESTING RESULTS TO CONFIRM THAT THE COMPOST BEING SUPPLIED MEETS THE FOLLOWING SPECIFICATIONS: a. ORGANIC MATTER CONTENT BETWEEN 45% AND 65% AS DETERMINED BY LOSS OF IGNITION TEST METHOD. b. PH BETWEEN 5.5 AND 8.0. c. CARBON:NITROGEN RATIO BETWEEN 20: AND 25: FOR MOST LANDSCAPES EXCEPT A CN RATIO OF 30: TO 35: IS PREFERRED FOR NATIVE WOODY PLANTINGS. d. MAXIMUM ELECTRICAL CONDUCTIVITY OF 6 MMHOS/CM. e. MOISTURE CONTENT RANGE BETWEEN 35 AND 50%. f. NO VIABLE WEED SEEDS. g. MANUFACTURED INERT MATERIAL (PLASTIC, CONCRETE, CERAMICS, ETC.) SHOULD BE LESS THAN % ON A DRY WEIGHT OR VOLUME BASIS (AS REQUIRED BY WAC ). h. METALS SHOULD NOT BE IN EXCESS OF LIMITS IN THE FOLLOWING TABLE: METAL ARSENIC CADMIUM COPPER LIMIT (MG/KG DRY WEIGHT) 20 PPM 0 PPM 750 PPM LEAD 50 PPM MERCURY 8 PPM MOLYBDENUM 9 PPM NICKEL 20 PPM SELENIUM 8 PPM ZINC 400 PPM SC5.: DETAILS

7 NIC TREES LOCATED TO ALIGN WITH PARKING SPACE PAVEMENT MARKINGS PER SC2.0 SITE PLAN 3" CRUSHED ROCK MULCH. DEPRESSED NO MORE THAN /4" BELOW ADJACENT PAVEMENT EDGES CONCRETE WHEEL STOPS, TYP BOTTOM OF TREE WELL, SLOPES WITH GRADES IN THE EAST-WEST DIRECTION IMPERVIOUS PAVEMENT AND BASE ROCK TO BE PROTECTED LANDSCAPED PARKING ISLAND CURB TO BE REMOVED GRADE SOIL UP TO EDGE OF TREE WELL SC MIL EPDM IMPERMEABLE LINER (FOUND AT ROOFING SUPPLY COMPANIES) AROUND BOTTOM AND SIDES OF TRENCH AND AS SHOWN TO MINIMIZE GROUNDWATER INTRUSION IN TRENCH 8.25 LF 8" DIA HDPE SOLID PIPE WITH WATERTIGHT CAP INSTALLED ON END. S = FIELD CUT SLOTS ON TOP HALF ONLY. SURROUND WITH SAME OPEN-GRADED (I.E. ALL THE SAME SIZE) CRUSHED ROCK USED IN PLANTER STRIP UNCOMPACTED NATIVE SOIL COMPOST AMENDED NATIVE SOIL, SEE CONSTRUCTION SEQUENCE LINE OF SOIL LIFTS DURING SOIL PLACEMENT, SEE CONSTRUCTION SEQUENCE Inlet Sampling Assembly & Infiltration Tree Well Longitudinal Section C-C' /4" = ' 45 MIL EPDM IMPERMEABLE BARRIER (FOUND AT ROOFING SUPPLY COMPANIES) PLACED TO A DEPTH OF AT LEAST 6" BELOW BOTTOM OF BASE ROCK, ALL SIDES THAT ABUT IMPERVIOUS PAVEMENT. OVERLAP ENDS 8" MINIMUM. PROPOSED ELEVATIONS ON EITHER SIDE OF LEVEL SPREADER TO BE EQUAL 3' 4" 3H:V SIDE SLOPES, MAX, TYP GRADE UNDISTURBED NATIVE SOIL 4-6" DEPTH OF 2-3" DIAMETER ANGULAR ROCK, SEE NOTE NOTES:. TO ARMOR LEVEL SPREADER AND TO REDUCE MAINTENANCE FROM RE-PLACING ROCKS AND WEEDING, AMENDED NATIVE SOIL AND NATIVE PLANTS MAY BE SUBSTITUTED FOR ANGULAR ROCK. Level Spreader, Section D-D' NTS CENTERLINE = LOW POINT = SAME ELEVATION ALONG ENTIRE LENGTH, TO BE CENTERED ON WEIR SLOT FROM PROPOSED CATCH BASIN GEOTEXTILE FABRIC SC5.2: DETAILS

ABBREVIATIONS. Dwg LID of 1. Abbreviations

ABBREVIATIONS. Dwg LID of 1. Abbreviations ABBREVIATIONS DIA DIAMETER EL ELEVATION FT2 SQUARE FOOT GAL/MIN GALLONS PER MINUTE H HORIZONTAL HDPE HIGH DENSITY POLYETHYLENE HMAC HOT MIX ASPHALT CONCRETE IE INVERT ELEVATION MAX MAXIMUM NO. NUMBER ODEQ