MAINTENANCE ELIGIBILITY PROGRAM (MEP) MHFD Referral Review Comments For Internal MHFD Use Only. MEP ID: 107050 & 104969 Submittal ID: 10004152 MEP Phase: Referral Date: January 17, 2020 To: Crystal Carlow Via email RE: MHFD Referral Review Comments Project Name: Brantner Gulch at Creekside and Creekside (128 th & Quebec) Location: 128 th Ave and Quebec St Drainageway: Brantner Gulch, Plains Tributary This letter is in response to the request for our comments concerning the referenced project. We have reviewed this proposal only as it relates to maintenance eligibility of major drainage features, in this case: - Plains Tributary - Local storm drain outfalls to Brantner Gulch and Plains Tributary - Quebec Street Brantner Gulch crossing improvements Documents were received for two separate MEP projects with this submittal – the channel improvements, Brantner Gulch at Creekside (MEP #107050), and the development-associated improvements, Creekside (128 th & Quebec) (MEP #104969). Comments will be provided separately for each. We have the following comments to offer on Otak’s project Brantner Gulch at Creekside (MEP # 107050): 1) Please define the different concrete cap details and the extents to which these details are applied more explicitly. It is not clear on the plans. Please review the redlines (pages 4 and 5) following this letter. We have the following comments to offer on Ware Malcomb’s project Creekside (128 th & Quebec) (MEP # 104969): 1) Drainage Report: There is a paragraph on page 47 that references grouted boulder rundowns. This is not a technique being used in the design. Please revise this paragraph and update according to the actual improvements needed/designed. 2) Drainage Report: A comment response to a previous comment states that revisions to the culvert appendix were made and a summary sheet was added to provide clarification. The summary is appreciated, but the hydraulic calculations following the summary do not match the descriptions provided for any of the culverts in the summary table. Further clarification is needed.
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MAINTENANCE ELIGIBILITY PROGRAM (MEP) MHFD Referral Review Comments
For Internal MHFD Use Only. MEP ID: 107050 & 104969
Submittal ID: 10004152 MEP Phase: Referral
Date: January 17, 2020 To: Crystal Carlow
Via email RE: MHFD Referral Review Comments
Project Name: Brantner Gulch at Creekside and Creekside (128th & Quebec) Location: 128th Ave and Quebec St
Drainageway: Brantner Gulch, Plains Tributary
This letter is in response to the request for our comments concerning the referenced project. We have reviewed this proposal only as it relates to maintenance eligibility of major drainage features, in this case:
- Plains Tributary - Local storm drain outfalls to Brantner Gulch and Plains Tributary - Quebec Street Brantner Gulch crossing improvements
Documents were received for two separate MEP projects with this submittal – the channel improvements, Brantner Gulch at Creekside (MEP #107050), and the development-associated improvements, Creekside (128th & Quebec) (MEP #104969). Comments will be provided separately for each.
We have the following comments to offer on Otak’s project Brantner Gulch at Creekside (MEP # 107050): 1) Please define the different concrete cap details and the extents to which these details are applied
more explicitly. It is not clear on the plans. Please review the redlines (pages 4 and 5) following this letter.
We have the following comments to offer on Ware Malcomb’s project Creekside (128th & Quebec) (MEP # 104969):
1) Drainage Report: There is a paragraph on page 47 that references grouted boulder rundowns. This is not a technique being used in the design. Please revise this paragraph and update according to the actual improvements needed/designed.
2) Drainage Report: A comment response to a previous comment states that revisions to the culvertappendix were made and a summary sheet was added to provide clarification. The summary isappreciated, but the hydraulic calculations following the summary do not match the descriptionsprovided for any of the culverts in the summary table. Further clarification is needed.
Project Name: Brantner Gulch at Creekside and Creekside (128th & Quebec) Mile High Flood Control District (MHFD) MEP Referral Review Comments MEP ID: 107050 & 104969/10004152
Date: 1/17/20
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3) Drainage Report: Please revisit the Brantner Gulch Box Culvert worksheet (page 139). Flow, inverts, dimensions, etc. don’t make sense. The pipe has in inverse slope in the worksheet.
4) Drainage Report: The riprap protection calculated for pond outfalls appears to assume a 100-yr WSE in the receiving channel. This assumption is not guaranteed and can result in inadequate protection. The District recommends placing riprap protection to the toe of the bank at outfalls, especially for Plains Tributary culverts and for pond spillways.
5) Construction Plans, PD01: Thank you for specifying a thickened edge along the trail at the
emergency spillway. However, a detail should be added to specify how to construct the thickened edge. Depth dimension is not sufficient.
6) Construction Plans, PD02: Please clean up the stilling basin profile detail to more accurately depict
the difference in elevations between the sill and FES invert
7) Construction Plans, PD08: The outlet pipe from Pond C2 is quite steep. Please consider decreasing the pipe slope by lower the inlet elevation with a deeper outlet structure.
8) Construction Plans: It appears some embankments have been adjusted per the previous
comment, but other embankments remain the same and have heights in excess of 8’. Please verify that all embankments have been reviewed, and that consultation with the State Engineers Office of Dam Safety was contacted for review and classification.
9) Construction Plans, CH01: Stilling basin sill should be 1’ lower than pipe/crest invert. Current
design has a 0.4’ difference.
10) Construction Plans, CH04: Thank you for adding soil riprap protection at the connection between Plains Tributary and Brantner Gulch. Please show the extents of the soil riprap protection in profile, and provide dimensions or some other indication of where the soil riprap will be placed. Please ensure that the entire connection between Plains Tributary and Brantner is protected from erosion.
details, and wingwall details. Please include the appropriate CDOT Headwall details for box culverts. The M standard provided on DT17 for headwalls is not appropriate for the culvert on BC01.
12) Construction Plans, TR03: Provide FES details for Trail Crossings 1 and 2. Box culvert crossings
have simple section views, and reference structural plans for more detailed information. Where are structural plans?
13) Construction Plans, TR04: Show culvert crossings on Plains Tributary Regional Trail.
Project Name: Brantner Gulch at Creekside and Creekside (128th & Quebec) Mile High Flood Control District (MHFD) MEP Referral Review Comments MEP ID: 107050 & 104969/10004152
Date: 1/17/20
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14) Construction Plans, UPP29: A previous comment asked for restoration information for an open cut sanitary sewer construction. The response indicated that restoration would be per wetland permit requirements. That is not a sufficient response. If restoration work is required, information as to how that restoration will be completed must be provided on this sheet or a separate, landscaping/restoration sheet.
15) Construction Plans, DT15: Please add USDCM Figure 9-29 to the plans.
16) Construction Plans: The District recommends placing riprap protection to the toe of the bank at outfalls, especially for Plains Tributary culverts and for pond spillways.
We appreciate the opportunity to review this proposal. Please feel free to contact me with any questions or concerns. Sincerely,
Teresa Patterson, P.E., CFM Project Manager, Watershed Services Mile High Flood District
A
D3
SCULPTED CONCRETE DROP PROFILE (TYP.)
NOT TO SCALE
A
B
C
D
B
D3
SCULPTED CONCRETE DROP CREST DETAIL , A-A (TYP.)
NOT TO SCALE
D
C
D4
WEEP DRAIN TYP.
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D
D3
SCULPTED CONCRETE SILL END DETAIL, B-B (TYP.)
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WOODBURYCORPORATION
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SHEETPILE PZ 22 OR EQUIVALENT
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12" SCULPTED CONCRETE
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SCULPTED CONCRETE
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REBAR CONNECTED TO DROP (SCULPTED) REBAR GRID
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DROP CREST
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Z:1 DROP FACE SLOPE, AVG.
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REPRESENTATIVE STEP REINFORCEMENT. REPLICATE THROUGHOUT STRUCTURE AT EACH STEP.
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TOE
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UPSTREAM CHANNEL INVERT ELEVATION
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RIPRAP - SIZING IN TABLE THIS SHEET
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REFER TO DETAIL B ON THIS SHEET FOR CUTOFF WALL CROSS SECTION
PZ-22 SHEET PILE CUTOFF WITH SEALANT- EXTEND TO ELEVATION D IN TABLE BELOW.
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SHEET PILE CUTOFF CAP EXTENDS 5 - 10 FT MIN. BEYOND 10-YR WATER SURFACE
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SHEET PILE SECTIONS
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REFER TO DETAIL D ON SHEET D4 FOR EDGE D4 FOR EDGE FOR EDGE WALL DETAIL (TYP.)
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Q10
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AVG. SLOPE 2:1 (MAX)
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PROPOSED SECTION
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SCULPTED CONCRETE
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Q2
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SOIL
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NOTES: 1.CHICKEN WIRE SHALL BE PLACED ALONG THE UPSLOPE FACE OF SPLICE BARS TO CHICKEN WIRE SHALL BE PLACED ALONG THE UPSLOPE FACE OF SPLICE BARS TO HOLD CONCRETE AT STEP FACE DURING PLACEMENT. 2.THE CONTRACTOR WILL WORK WITH THE ENGINEER TO CREATE A SCULPTED THE CONTRACTOR WILL WORK WITH THE ENGINEER TO CREATE A SCULPTED CONCRETE SHAPE WITH IRREGULAR STEPS AND WIDTHS SUCH THAT IT RESEMBLES THE EXISTING BEDROCK OUTCROPS AT THE SITE AND APPEARS NATURAL. 3.CONTRACTOR SHALL WORK WITH THE ENGINEER TO CREATE CONCRETE COLORS CONTRACTOR SHALL WORK WITH THE ENGINEER TO CREATE CONCRETE COLORS RESEMBLING THE EXISTING BEDROCK OUTCROPS AT THE SITE BY ADDING PIGMENT AND STAINING TO THE CONCRETE. 4.CONTRACTOR SHALL WORK WITH THE ENGINEER TO FINISH THE CONCRETE SUCH CONTRACTOR SHALL WORK WITH THE ENGINEER TO FINISH THE CONCRETE SUCH THAT IT RESEMBLES THE EXISTING BEDROCK OUTCROPS AT THE SITE. THE TECHNIQUES MAY INCLUDE, BUT ARE NOT LIMITED TO, TROWELING, SCULPTING, CARVING, STAMPING AND TOP DRESSING WITH SAND OR GRAVEL. 5.CONTRACTOR SHALL COMPLETE A TEST PANEL (10' X 10') TO PRACTICE THE CONTRACTOR SHALL COMPLETE A TEST PANEL (10' X 10') TO PRACTICE THE OVERALL FORM AND FINISHING DETAILS OF THE SCULPTED CONCRETE TO ENSURE A CONSISTENT VISION FOR THE STRUCTURES. 6.CONCRETE SHALL BE POWER WASHED TO REMOVE FROM RELEASE AGENT, DIRT CONCRETE SHALL BE POWER WASHED TO REMOVE FROM RELEASE AGENT, DIRT AND DEBRIS. 7.REBAR SHALL BE EPOXY COATED PER MILE HIGH FLOOD DISTRICT STANDARD REBAR SHALL BE EPOXY COATED PER MILE HIGH FLOOD DISTRICT STANDARD SPECIFICATIONS
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NOTE: INSTALL WEEP DRAINS FOR DROPS AND WALLS 5' AND GREATER AT 10' O.C. AT ELEVATIONS AND LOCATIONS SHOWN ON THE DRAWINGS
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3" MIN DIAMETER PVC (NON-PERFORATED) PIPE EVERY 10' 0.C. MAY BE ADJUSTED DUE TO BOULDER LOCATIONS
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FILTER FABRIC W/ CLAMP AT END OF PIPE
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STAINLESS STEEL HOSE CLAMP
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WEEP DRAIN
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PROTECT WHILE GROUTING. TRIM END OF PIPE FLUSH WITH TOP OF GROUT TO MINIMIZE PROTRUSION
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AVG. SLOPE 3:1
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SCULPTED CONCRETE
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1:1
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RIPRAP
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Date
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Drawing No.
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C Otak, Inc. 2015
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Checked
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Drawn
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Design
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Initial Issue Date:
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REVISION COMMENTS
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DATE
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BY
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NO.
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Project No.
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Sheet No.
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PREPARED FOR:
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SCULPTED CONCRETE DROP DETAIL 1
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BRANTNER GULCH AT CREEKSIDE
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STABILIZATION PROJECT
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THORNTON, CO
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FINAL DESIGN - NOT FOR CONSTRUCTION
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032738
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D3
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KP/JEA
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KP/AN
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BM
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11/21/19
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EXAMPLE PHOTO: SCULPTED CONCRETE DROP
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REACH
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SHEET NUMBER
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DROP CREST STA. [A]
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CREST EL. (FT) [A]
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TOE STA. [B]
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TOE EL. (FT) [B]
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BOTTOM OF SHEETPILE EL. (FT) [D]
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SLOPE (Z)
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SILL STA. [C]
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SILL El. (FT) [C]
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La (FT)
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Lf (FT)
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STILLING BASIN LENGTH - Lb (FT)
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STILLING BASIN DEPTH - Db (FT)
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HEIGHT DROP - Hd (FT)
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RIPRAP SIZING
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LAKEVIEW
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D3.7
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1+07
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5087.90
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0+84
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5082.70
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5076.70
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4H:1V
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0+68
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5084.70
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2.50
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23.00
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16.00
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2.00
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3.20
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TYPE L
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LAKEVIEW
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D3.6
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2+67
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5092.61
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2+40
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5086.50
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5080.50
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4H:1V
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2+22
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5088.53
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2.50
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27.00
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18.00
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2.03
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4.08
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TYPE L
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LAKEVIEW
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D3.5
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3+42
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5094.89
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3+27
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5091.80
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5085.80
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5H:1V
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3+10
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5092.76
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2.50
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15.00
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17.00
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0.96
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2.13
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TYPE L
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BRANTNER
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D3.8
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36+25
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5093.40
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35+69
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5087.80
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5081.80
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10H:1V
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35+56
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5088.80
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2.50
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56.00
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13.00
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1.00
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4.60
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TYPE H
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371 Centennial Parkway
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Louisville, Colorado 80027
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Suite 210
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Phone: 303-444-2073
mschutte
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Referenced detail doesn't show connection to sculpted drop. Either create separate detail for this connection or add needed dimensions to this detail.
B
D4
REBAR PLACEMENT
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D
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SCULPTED CONCRETE EDGE WALL DETAIL (TYP.)
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D4
SCULPTED CONCRETE DROP PLAN (TYP.)
NOT TO SCALE
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A
A
C
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REBAR PLACEMENT FOR CONCRETE CAP (TYP.)
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WOODBURYCORPORATION
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#4 REBAR AT 12" O.C., E.W.
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#4 BAR AT 12" O.C., E.W.
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FINAL GRADE
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BOTTOM EDGE OF WALL
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EDGE WALL TO BE NEAR VERTICAL
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SCULPTED CONCRETE DROP STRUCTURE
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1. DETAIL APPLIES TO THE PERIMETER OF THE ENTIRE STRUCTURE 2. SEE THE REBAR PLACEMENT DETAIL FOR CLEARANCE FROM TOP AND BOTTOM OF THE STRUCTURE
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NOTES:
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SCULPTED CONCRETE
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END SILL
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RIPRAP
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FLOW
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DROP FACE
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STILLING BASIN
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SHEET PILE CUTOFF WALL
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RIPRAP APPROACH
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SOIL RIPRAP TREATMENT FOR AREAS OUTSIDE OF THE 5'MIN - 10' MAX BEYOND 10-YEAR EXTENTS PER ENGINEER DIRECTION
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SHEET PILE
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#4, 24" O.C. (SPOT WELD OR DRILL THROUGH)
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1/2" CHAMFER TYP
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6" (OPTIONAL COVER BEYOND LOW FLOW CHANNEL
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#4, 12" O.C. EACH WAY
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Date
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Drawing No.
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C Otak, Inc. 2015
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Checked
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Drawn
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Design
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Initial Issue Date:
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REVISION COMMENTS
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DATE
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BY
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NO.
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Project No.
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Sheet No.
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PREPARED FOR:
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SCULPTED CONCRETE DROP DETAIL 2
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BRANTNER GULCH AT CREEKSIDE
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STABILIZATION PROJECT
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THORNTON, CO
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FINAL DESIGN - NOT FOR CONSTRUCTION
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032738
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D4
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KP/JEA
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KP/AN
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BM
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11/21/19
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371 Centennial Parkway
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Louisville, Colorado 80027
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Suite 210
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Phone: 303-444-2073
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Reference appropriate detail for concrete cap outside of sculpted drop connection.
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Reference appropriate detail for concrete cap outside of sculpted drop connection.
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Reference appropriate detail for concrete cap where connected to sculpted drop.
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Provide second detail for Concrete Cap with connection to sculpted drop or provide the information needed on detail A/D3.
