HomeMy WebLinkAbout1411 Crystal Lake Road Drainage Mitigation Memo 2021-12-15To: Devin Gardiner, Pinon Sage Landscape Architects
From: Jesse Swann, PE
Date: 12-%-20 1
Re: 1411 Crystal Lake Road Drainage & Water Quality Mitigation Memo
SE Job #31228.01
Sopris Engineering has prepared this drainage/water quality mitigation memo in support of the construction of a pool located at
14r1�1 �Cry-�sptal make Road in Aspen, yT�his letter outlines the ye�xisting condition a#s well as the proposed storm -water mitigation to
a
treat stormwater minoii geneerat-eIV fro i 1MI3iG pool aiddition. C"-II V Grading, Aatei Ctuality Mi fi U ErV0i IE Vlfntri3� t€Si1 has
been provided as an attachment for illustrative support.
Existing Conditions
The area of focus for this study includes the area south of the existing impervious patio on the south side of the existing
residence. Woody Creek Engineering prepared Civil documents , date Mash 1, 2018, for the property, to include design
drawings and a Major Grading and Drainage Report, in support of the constructed residence. Sopris Engineering prepared the
Grading and Drainage As Built Survey for these recent improvements. The Grading and Drainage Certificate was submitted to
the City as part of a Temporary Certificate of Occupancy dated May 19th, 2021 and updated in support of a final Certificate of
Occupancy dated July 2, 2021.
The exi4t ng grog Ana cover within the area of stud consists of landscape lathm area, as illustrated in Figure 1 below. Currently,
stormwater runoff generated from the proposed pool area generally flows to the south over well vegetated ground cover with
slopes ranging between 10%-15% and ultimately discharges into the Roaring Fork River.
Figure 1: Existing Poo/ Patio and Lawn Area
A subsoil study prepared by l-t-P Kumar G®otechnical Engineering, dated June 2 , 2017 was prepared in support of the
recently constructed residence. Boring logs provided within the report indicate the soils in the area consist of approximately 6"
of topsoil overlying medium dense to dense, silty sand, gravel and cobbles with probably boulders. This geotechnical study
included a percolation test which indicates perc rates of approximately 4 to 8 minutes per inch (15 to 7.5 inches per hour).
502 Main Street Suite A3 Carbondale, CO 81623 • (970) 704-0311 Fax (970) 704-0313
civil consultants
Proposed Improvements
The proposed improvements associated with this project primarily include the construction of a new pool on the south side of
the existing impervious patio and construction of an at grade bioretention cell to treat the increased impervious area for a total
estimated amount of disturbance of 1,550 sf. A slight modification to an existing bioretention cell near the base of the existing
patio steps is required to accommodate the proposed pool area. Additionally, the integratiE3n of the short landscape rock wall
south of the proposed pool will facilitate the proposed bioretention cell while ensuring the proposed construction does not
encroach within the 15-ft top of slope setback to the south.
Post Basin-1 is a developed conditions design drainage basin primarily associated with the proposed pool and the proposed
water quality treatment bioretention cell (BRC-1) south of the pool. BRC-1 is designed to collect and retain the required water
aauality capture volume for II'e tributary impervious runoff, consistent will',, Section 8.5.3.1 of the URMP, The design of BRC-1
included an underdrain system with an impervious liner and perforated underdrain given its proximity to the proposed pool
foundation. The perforated underdrain is designed to collect and route the filtered runoff to the hillside south of the proposed
improvements, with the underdrain pipe daylighting to surface above the top of slope setback. Storm events generating runoff
in excess of the water quality capture volume will simply overtop the proposed boulder landscape wall, which acts as a level
spreader_ Runoff will then sheet flow across vegetated ground cover towards the Roaring Fork River, consistent with existing
drainage patterns. Please see .he BRC summary table below for design info3rrnatio; �.
EX Basin-1 is a developed conditions design drainage basin primarily associated with the existing spa patio and the modified
existing bioretention cell area. Runoff generated by the impervious pool area is designed to sheet flow directly to the modified
existing bioretention cell (EX-BRC) directly to the south, near the base of the existing spa patio stairs. Modifications to the
existing bioretention cell are to be made in kind with the existing methods and materials approved with the original Woody
Creep Engineering design. Minor modifications will be made to the overall shape and design depth to ensure the water quality
capture volume is provide for the tributary impervious runoff, consistent with Section 8.5.3.1 of the iURMP. Storm events
generating runoff in excess of the water quality capture volume will overtop the bioretention cell edge, sheet flows across the
well vegetated hillside to the south, and ultimately discharges to the Roaring Fork River consistent with existing drainage
patterns. Please see the BRC summary table below for design information.
Table 1 — BRC Design Summary
i BRC j
ID
Area
(SF)
1 %
impery
WQCV
(in)
WQtCV
(d)
Footprint
(5f)
Depth
(ft)
WQCV
Provided (d)
EX BRC
417
81%
1 0,17
5.9
25
1 0.3
7.5
POST 1
1000
81%
1 0.17
14.2
80
1 0.25
20
The overarching approach of theme proposed c}jiviil improvements(p�a}re to provide
�a)watterj{jq�up�ality treatment
},deesign for�the
;ape YfI %Ali pout area that i0 consistent >t��ith the r-.V-,pis in�piG}5ke1%X, in tt iG Lr}i�tnill �i`�L 4t12y Cr�BGk Lng}t 4G GrYni� Uecitgn
}}4t
prepared in support of the existing residence. All proposed water quality improvements additionally comply with the City's
standards for development set forth in the Urban Runoff Management Plan.
A copy of the Grading, Water Quality & Erosion Control Plan has been attached to this letter for reference. If you have any
questions or need any additional information, please call (970; 70 -0311.
Sincerely,
I,tiY O lL 7
Jesse K. Swann, PE 4' g
Sopris Engineering, LLC
Encl: Grading & Erosion Control Plan
502 Main Street Suite A3 Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
E
i civil consultants 21
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T O P O F S L O P E
D E F I N E D B Y
G A R Y B E A C H E N V I R 0 M E N T A L &
C I T Y O F A S P E N E N G I N E E R I N G
D E P A R T M E N T
F I E L D L O C A T E D
S E P T E M B E R 2 0 , 2 0 1 6
1
5
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T O P O F S L O P E
1 5 .0 ' S E T B A C K L I N E
MEAN HIGH WATER LINE
DEFINED BY GARY BEACH
ENVIR0MENTAL
FIELD LOCATED JULY 21, 2016
(EDGE OF SLOPE ANALYSIS)WETLANDS DELINEATION
DEFINED BY GARY BEACH
ENVIR0MENTAL
FIELD LOCATED JULY 21, 2016
F I R M M A P Z O N E X
W I T H I N 0 .2 % A N N U A L C H A N C E F L O O D P L A I N
F I R M M A P Z O N E A E
EXISTING PATIO
SF
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F
SF
SF
SF
S F
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7981
7983
7982
7981
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7983
79817980
79
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79
79
7983
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7 9 8 1
7 9 8 0
7 9 7 9
7978
EXISTINGBOULDER (TYP)
EXISTING STORMWATERDRY WELL
PROPOSED POOL; RE. TOPOOL PLANS BY OTHERS
REMOVE EXISTINGRETAINING WALL
PROPOSED RAIN GARDEN(BRC-1); RE. TO SUMMARY SIZINGTABLE & DETAIL SHT. C-2.0
EX. TRENCH DRAIN TO BE PROTECTED OR REPLACEDIN KIND IF DAMAGED DURING CONSTRUCTION
CONTRACTOR TO SURVEY IN TOP OF SLOPE& INSTALL SILT FENCE (RE. TO DETAIL SHT.
C-2.0) TO CONTROL SEDIMENT TRANSPORT& TO ESTABLISH LIMITS OF DISTURBANCE
APPROX.LIMITS OFDISTURBANCE(1,550± sf)
REPLACE EX. STEPS INKIND IF DAMAGEDDURING CONSTRUCTION
1
1
2
2
3
3
4
4
5
5
EX-BASIN 1; RE. TO BASIN & WQCVSUMMARY TABLE SHT C-2.0
EX-BRCCONTRACTOR TO PROTECT EXISTING RAINGARDEN AND RE-SHAPE TO ACCOMMODATEFINAL SITE CONDITIONS & ENSURE REQ'DWQCV IS PROVIDE; RE. TO BRC SIZING TABLESHT. C-2.0
POST-BASIN 1AREA: 1,000 sfREQ. WQVC:
1411 CRYSTAL LAKE ROAD
>
>>>
EXISTING PATIO
PERFORATED UNDERDRAIN W/CLEANOUTS & SLD. GRATES
SOLID UNDERDRAINW/ RODENT SCREENINV: 7980.2±
FG: 82.25
FL: 82.28 FL: 82.28
TW: 82.50
FL: 82.40FL: 82.40
FL: 82.31 FL: 82.91
FL: 82.00
TC: 83.66
TC: 83.66
TW: 82.50TW: 82.50
TW: 82.50
TW: 82.50
BW: 81.18
BW: 81.00
BW: 80.72BW: 80.78
BW: 81.04BW: 80.73BW: 80.85
BW: 81.01
BW: 81.32
S F
INSTALL SEDIMENTCONTROL LOG
SECTION 1 - 1
7976
7978
7980
7982
7984
7986
7988
7976
7980
7984
7988
0 100-10
SECTION 2 - 2
7976
7978
7980
7982
7984
7986
7988
7976
7980
7984
7988
0 100-10
SECTION 3 - 3
7974
7976
7978
7980
7982
7984
7986
7988
7974
7976
7980
7984
7988
0 100-10
SECTION 4 - 4
7976
7978
7980
7982
7984
7986
7988
7976
7980
7984
7988
0 100-10
SECTION 5 - 5
7976
7978
7980
7982
7984
7986
7988
7976
7980
7984
7988
00-10
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PROPOSEDPOOLEX.PATIO
PROPOSEDPOOLEX.PATIOTC: 7983.66
TW: 7982.50
TC: 7983.66
FL: 7982.32
TC: 7983.66
FG: 7982.25
TC: 7983.66
FL: 7982.29
TC: 7983.66
FL: 7982.40
TW: 7982.53
TW: 7982.50
TW: 7982.50
TW: 7982.50
EX. TRENCH DRAIN TO BE PROTECTEDOR REPLACED IN KIND IF DAMAGEDDURING CONSTRUCTION (TYP)
BW: 7981.12
15
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-
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T
B
A
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K
15
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15
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BW: 7981.01
BW: 7980.72
BW: 7980.95SURVEY TOP OF SLOPE SETBACK ANDINSTALL SILT FENCE FOR SEDIMENTCONTROL & TO DELINEATE LIMITS OFALLOWABLE DISTURBANCE (TYP)
PROPOSEDPOOL
SECTION SCALEHORZ: 1" =5'VERT: 1"=5'
SECTION SCALEHORZ: 1" =5'VERT: 1"=5'
SECTION SCALEHORZ: 1" =5'VERT: 1"=5'
SECTION SCALEHORZ: 1" =5'VERT: 1"=5'
SECTION SCALEHORZ: 1" =5'VERT: 1"=5'
PROPOSEDPOOLEX.PLANTER
EX.PATIOPROPOSEDPOOL
6" MAX.
OPRIS ES NGINEERING, LLC.
CIVIL CONSULTANTS
31228.01JOB NO.
DATE:12-15-2021
502 MAIN STREETCARBONDALE, CO 81623(970) 704-0311FAX: (970)-704-0313
DATE REVISION
C-1.0
DRAWING NO.
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GRADING, WATER
QUALITY & EROSIONCONTROL PLAN
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1 inch = ft.( IN FEET )
GRAPHIC SCALE
010 10 20
10
405
MEMBER UTILITIESFOR THE MARKING OF UNDERGROUNDBEFORE YOU DIG, GRADE, OR EXCAVATECALL 2-BUSINESS DAYS IN ADVANCE
Know what's
R
GENERAL NOTES:
1.EXISTING CONTOURS ILLUSTRATED HEREIN ARE AT 1 FT INTERVALS & PREPARED BY SOPRIS ENGINEERING.
2.PROPOSED CONTOURS ARE AT 1 FT INTERVALS.
3.ALL SPOT ELEVATIONS AND GRADING CONCEPTS SHALL BE FIELD VERIFIED PRIOR TO CONSTRUCTION. ANY DEVIATIONS SHALL BECOORDINATED WITH THE ENGINEER OF RECORD AND LANDSCAPE ARCHITECT.
4.THIS PROPERTY IS SITUATED IN ZONE "X" (AREA DETERMINED TO BE OUTSIDE THE 500-YEAR FLOOD PLAIN) AS SHOWN ON THE FLOODINSURANCE RATE MAP PREPARED BY F.E.M.A. FOR PITKIN COUNTY COLORADO, COMMUNITY-PANEL NUMBER 08097C0366E, EFFECTIVEDATE: AUG. 15, 2019.
5.THE CONTRACTOR MUST IMPLEMENT BEST MANAGEMENT PRACTICES (BMP's) TO MINIMIZE THE TRANSPORTATION OF SEDIMENT BEYONDTHE LIMITS OF DISTURBANCE.
6.NO SITE DISTURBANCE IS PERMITTED WITHIN THE 15-FT TOP OF SLOPE SETBACK. CONTRACTOR IS REQUIRED TO CONTAIN ALL WORKOUTSIDE THE TOP OF SLOPE SETBACK.
7.CONTRACTOR SHALL PROTECT ALL EXISTING TREES THAT ARE TO REMAIN. A TREE PROTECTION PLAN MUST BE APPROVED BY CITY PARKSDEPARTMENT AND LANDSCAPE ARCHITECT PRIOR TO COMMENCING CONSTRUCTION.
8.THE UTILITIES AS SHOWN, MAY NOT REPRESENT ACTUAL FIELD CONDITIONS. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO CONTACTALL UTILITY COMPANIES FOR FIELD LOCATIONS OF UTILITIES PRIOR TO CONSTRUCTION.
DRAINAGE DIRECTION/SLOPE
SPOT ELEVATION
EXAMPLE: FINAL GRADE @ 8001.60' =
BW = BOTTOM OF WALLFG = FINISHED GRADEFL = FLOW LINEME = MATCH EXISTINGTW = TOP OF WALL
XX:XX.XX'
2.0%
FG:01.60'
SPOT ELEVATION LEGEND
VICINITY MAPSCALE: 1" = 200'
PROPOSED CONTOUR
PROPOSED CONTOUR INTERVAL7900
EXISTING MINOR CONTOUR (1' INTERVAL)
EXISTING MAJOR CONTOUR (5' INTERVAL)8005
PROPOSED SEDIMENT CONTROL LOGSCL
PROPOSED LIMIT OF DISTURBANCELOD
8000
LEGEND
TITLE PROPERTY DESCRIPTION
PARCEL I
A parcel of land situated in the NE 1/4 of Section 18, Township 10 South, Range 84 West, of the 6th Principal Meridian, Pitkin
County, Colorado and lying entirely within the Riverside Placer MS 3905 AM and being more fully described as follows:
Beginning at a point on the Southerly bank of the Roaring Fork River, said point also being on Line 8-9 of said
RiversidePlacer, whence corner 9 of said Riverside Placer bears South 242.86 feet; thence North 249.19 feet along said line
8-9; thence East 125.00 feet; thence S 28°30'00" E 132.58 feet; thence S 15°13'00" W 137.22 feet to a point on the
centerline of said Roaring Fork River; thence West 2.54 feet along said centerline; thence S 89°53'46" W 149.71 feet to the
point of beginning.
NOTE: SCALE OF DRAWING
REDUCED FOR ATTACHMENT
TO REPORT
30 MIL GEOMEMBRANE LINER BOLTEDTO EXISTING CONCRETE STEMWALL ORBY PRE-APPROVED FASTENING METHOD
FILTER FABRIC; RE. TO TABLE AFOR SPECIFICATIONS
8" MIN CDOT #3 OR #4AGGREGATE OR APPROVED EQUAL
BRC LANDSCAPING; RE. TOLANDSCAPE PLANS
PROPOSED POOL DECK, BY OTHERS.RE: POOL DRAWINGS
2-FT TALL MAX. LANDSCAPE BOULDERCONTAINMENT WALL, TYP. BRIDGEBOULDER WALL OVER DRAIN PIPE; RE.TO DETAIL THIS SHT.
4" PERFORATED RIGID PVC UNDERDRAIN @0.5% SLOPE . CONTECH A200 OR APPROVEDEQUAL. TRANSITION TO SOLID PIPE PRIOR TOEXITING LINED BASIN. INSTALL RODENTSCREEN AT OUTFALL
4" PVC UNDERDRAIN TO DAYLIGHTTO SURFACE ABOVE TOP OF SLOPESETBACK LINE. INSTALL RODENTSCREEN AT OUTFALL
EXISTING LAWN, TYP.
BRC FINISHED GRADE. SEE PLAN VIEW
18" GROW MEDIA;RE. TO SPEC THISSHT.
GEOMEMBRANE LINER; RE.TO TABLE B FORSPECIFICATIONS
OPRIS ES NGINEERING, LLC.
CIVIL CONSULTANTS
31228.01JOB NO.
DATE:12-15-2021
502 MAIN STREETCARBONDALE, CO 81623(970) 704-0311FAX: (970)-704-0313
DATE REVISION
C-2.0
DRAWING NO.
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DETAILS
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MEMBER UTILITIESFOR THE MARKING OF UNDERGROUNDBEFORE YOU DIG, GRADE, OR EXCAVATECALL 2-BUSINESS DAYS IN ADVANCE
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TABLE A: GEOTEXTILE SEPARATOR FABRIC SEPCIFICATIONS
RAIN GARDEN (BIO-RETENTION CELL) NOTES:
1.RAIN GARDENS SHALL BE INSTALLED IN ACCORDANCE WITH SECTION 8.5.3 OF THE CITY'S URBAN RUNOFF MANAGEMENT PLAN.2.BIORETENTION GROW MEDIA SPECIFICATIONS (BY VOL.)
·PROVIDE, AS A MINIMUM, 18-INCH LAYER OF WELL MIXED SAND AND SOIL (70% SAND AND 30% COMBINATION OF
TOPSOIL AND LARGE ORGANIC MATTER BY VOLUME WITH LESS THAN 5% OF THE MIXED MEDIA PASSING THE 200 SEIVE).
·THE MEDIA MUST INFILTRATE AT LEAST 2IN/HR
·MAINTAIN TOP SURFACE FLAT
·MEDIA SHALL BE DELIVERED FULLY MIXED IN A DRUM MIXER UNLESS ONSITE MIXING MEANS AND METHODS AREAPPROVED BY CITY ENGINEERING.
·MAINTAIN MAX. 3:1 SIDE SLOPES OR INSTALL SMALL BOULDERS/WALLS.
·GEOTECH SHALL CONFIRM PERMEABILITY OF EXISTING SUB GRADE TO CONFIRM WHETHER AN UNDERDRAIN IS REQUIRED.
·THE GROW MEDIA SHALL BE MOISTENED & LEVELED WITH LITTLE OR NO COMPACTION.
3.WRAP ALL SEPARATOR FABRIC TO TOE OF SOIL, ATTACHED FIRMLY TO TRENCH SIDES. (SEE TABLE FOR SPECIFICATIONS)4.CONTRACTOR SHALL REMOVE EXISTING TOPSOIL AND UNDERLYING SOILS AND REPLACE WITH GROW MEDIA AND FILTERMATERIAL AS ILLUSTRATED.5.REMOVE & STOCKPILE TOPSOIL, SCARIFY BOTTOM OF EXCAVATION PRIOR TO PLACING SEPARATOR FABRIC.6.CONTRACTOR TO PROTECT WATER QUALITY BASINS FROM SEDIMENT CONTAMINATION DURING CONSTRUCTION ACTIVITY.
SCALE: N.T.S.
BRC-1 TYPICAL DETAIL CLASS C FILTER MATERIAL
SPECIFICATIONS
NOTES:1.GEOMEMBRANE LINER ONLY REQUIRED WHEN ANUNDERDRAIN IS REQUIRED FOR BIORETENTION CELLS.2.INSTALL GEOMEMBRANE LINER FOR ENTIRE BIO-RETENTIONCELL AREA AND ATTACH TO CONCRETE AS ILLUSTRATED TOESTABLISH A COMPLETELY LINED BIO-RETENTION CELL.3.PROVIDE SLACK IN LINER PLACEMENT TO ENSURE PROPERINSTALLATION AND BACKFILL WITHOUT DAMAGE.4.CORNER SEAMS TO BE WELDED IN FIELD5.BACKFILL AND UNDERDRAIN SYSTEM NOT SHOWN; RE.TYPICAL BIO-RETENTION CELL SECTION DETAIL
BUTYL TAC TAPE
14" x 2" STAINLESS STEEL ORGALVANIZED STEEL BATTEN BAROR PRE-APPROVED EQUAL
3/8" x 3" STAINLESS STEEL
ANCHOR BOLT, NUT &WASHER AT 12" O.C.
30 MIL (MIN.) PVC GEOMEMBRANE; EXTEND LINER UP SIDEWALLS A MAX. OF 12-INCHES FROM BOTTOM ENSURING THATNO PORTION OF LINER OR BATTEN BAR IS EXPOSED AFTERPLACING FILTER MATERIAL AND DECORATIVE AGGREGATE
POOL WALL
TOP OF GROW MEDIA
SCALE: N.T.S.
GEOMEMBRANE LINER TO CONCRETE CONNECTION DETAIL
6" MAX.
(1
2
"
MI
N
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)
2' TO
3'
1/2H (12" MIN)
FABRIC MATERIAL (ANCHORED IN TRENCH)
H
SILT FENCE INSTALLATION
-NTS-
4"
4"
1/
2
H
H
(MAXIMUM)
-NTS-
FLOW
BACKFILL
TRENCH
JURISDICTION
NOTE:
POST ANCHORED TO
15'
SECTION
COMPACTED
4"x4"
OR AS DIRECTED BY LOCALLANDSCAPING IS COMPLETED,SHALL BE MAINTAINED UNTILEROSION CONTROL MEASURES
S F SILT FENCE DETAIL
FERNCO CLAMP OR APPROVEDEQUAL
EXAMPLE OF AN ANGLEDPIPE BOOT ON A SLOPE
TABLE B: GEOMEMBRANE LINER SPECIFICATIONS
BRC SUMARY TABLEBOND PIPE BOOT SKIRT TOGEOMEMBRANE LINER PERMANUFACTURER'SRECOMMENDATIONS
PREFABRICATED OR FIELDFABRICATED PIPE BOOT
EXTEND BOOT SUFFICIENTTO INSTALL CLAMPS
SOLID GASKETTED SDR-35UNDERDRAIN PIPE PERFORATEDUNDERDRAIN PIPE
SEDIMENT CONTROL LOG INSTALLATION NOTES SEDIMENT CONTROL LOG MAINTENANCE NOTES
A A
SECTION A - A
USE TWO STAKES 1 1/2 ' x 1 1/2 " x SUFFICIENTLENGTH TOEMBED AT LEAST 12" INTO SOIL AT EACH END OFLOG
USE A STAKE EVERY 24" AT ALTERNATE 90 DEGREEORIENTATION THROUGHOUT THE SEDIMENTATIONLOG.
SEDIMENTATION LOG - 12" MIN. DIAMETER
STAKE AT 90 DEG.TO EACH OTHER
WETLANDS OR FEATURESREQUIRING PROTECTION
(NOT TO SCALE)
1.SEE PLAN VIEW FOR: LOCATION OF SEDIMENT CONTROL LOG.2.SEDIMENT CONTROL LOGS SHALL BE INSTALLED PRIOR TO ANYLAND DISTURBING ACTIVITIES.3.SEDIMENT CONTROL LOGS SHALL CONSIST OF STRAW, COMPOST,EXCELSIOR OR COCONUT FIBER.4.NOT FOR USE IN CONCENTRATED FLOW AREAS.5.THE SEDIMENT CONTROL LOGS SHALL BE TRENCHED INTO THEGROUND A MINIMUM OF 2-INCHES.
1.THE SWMP MANAGER SHALL INSPECT SEDIMENT CONTROL LOGS DAILY, DURING AND AFTERANY STORM EVENT & MAKE REPAIRS OR CLEANOUT UPSTREAM SEDIMENT AS NECESSARY.2.SEDIMENT ACCUMULATED UPSTREAM OF SEDIMENT CONTROL LOGS SHALL BE REMOVED
WHEN THE UPSTREAM DEPTH IS WITHIN 12 THE HEIGHT OF THE CREST OF LOG.3.SEDIMENT CONTROL LOGS SHALL BE REMOVED AT THE END OF CONSTRUCTION, ONCE PROPERVEGETATION HAS BEEN ESTABLISHED. IF ANY DISTURBED AREA EXISTS AFTER REMOVAL ITSHALL BE COVERED WITH TOPSOIL AND REVEGETATED/STABILIZED IN A MANNER APPROVED BYTHE LOCAL JURISDICTION.SEDIMENT CONTROL LOG
SCALE: N.T.S.
GEOMEMBRANE LINER PIPE PENETRATION DETAIL
SCH. 80 SOLID DRAIN PIPE W/RODENT SCREEN AT OUTFALL
8" MIN.
BRIDGE BOULDERS OVER STORM PIPETO PREVENT CRUSHING. DO NOT PLACEBOULDERS DIRECTLY ON TOP OF PIPE.
PIPE BEDDING
FINISHED GRADE
SCALE: N.T.S.
BOULDER WALL BRIDGE DETAIL