Loading...
HomeMy WebLinkAboutFile Documents.210 S West End St.0011-2021-BCHO (22)Engineering1 - 210 S West End St- 0011-2021-BCHO Page: [1] 36x24Plan File Name: 40.Drainage Report Stamped.20210301.pdf Call out capture volume of each set of pervious pavers. Show the basin area that is routed to that specific set of pervious pavers. Follow Chapter 8 in the URMP to show volume based on gravel sub base depth and 30% void space. Deduct the area that will be pavers set on grade in the tree driplines. 40.Drainage Report Stamped.20210301.pdf (10) Page: [1] 36x24Plan File Name: 40.Drainage Report Stamped.20210301.pdf Is there a gutter or downspout along this edge of the roof? How is drainage routed to the flo-well? Page: [1] 36x24Plan File Name: 40.Drainage Report Stamped.20210301.pdf There has been reported drainage issues along this property line with runoff sheetflowing across the property line and causing issues for the neighbor. Verify that all runoff will infiltrate within the pervious paver. While using tree canopy credits is acceptable we also want to make sure any drainage issue across property lines is addressed. Page: [1] 36x24Plan File Name: 40.Drainage Report Stamped.20210301.pdf Where is this downspout routed? Is there enough paver area for it to infiltrate instead of sheet flowing across and onto the neighbors property? Page: [1] 36x24Plan File Name: 40.Drainage Report Stamped.20210301.pdf Where is this downspout routed? It does not make it to the pervious pavers or raingarden. Please address and clearly show that each downspout is routed to a BMP. Call out capture volume of each set of pervious pavers. Show the basin area that is routed to that specific set of pervious pavers. Follow Chapter 8 in the URMP to show volume based on gravel sub base depth and 30% void space. Deduct the area that will be pavers set on grade in the tree driplines. 1 Is there a gutter or downspout along this edge of the roof? How is drainage routed to the flo-well? 2 1362 19.4 3 88 13.4 Basin Area WQCV sqft cuft Title: Drainage Re v i s i o n # 21 0 S W e s t E n d S t r e e t As p e n , C o l o r a d o Job No.Drawn by: Date: File: PE:QC: 2020-474 JAK 02.17.2021 RB Sack-Linework-BM RB Da t e By : Pe r m i t S e t Pr o j e c t M i l e s t o n e : There has been reporteddrainage issues along this property line with runoff sheetflowing across the property line and causingissues for the neighbor. Verifythat all runoff will infiltrate withinthe pervious paver. While usingtree canopy credits is acceptable we also want to make sure any drainage issue across property lines is addressed. Where is this downspout routed? Is there enough paver area for it to infiltrate instead of sheet flowing across and onto the neighbors property? Where is this downspout routed? It does not make it to the pervious pavers or raingarden. Please address and clearly show that each downspout is routed to a BMP. Page: [1] 36x24Plan File Name: 40.Drainage Report Stamped.20210301.pdf Show this walkway is treated for WQCV. The landscape buffer BMP is an acceptable method. Page: [1] 36x24Plan File Name: 40.Drainage Report Stamped.20210301.pdf The drainage report states runoff will be treated by the pervious pavers and any additional runoff routed to the rain gardens. Given the elevations of this downspout that is not feasible. Show basins based on the BMP they are routed to so it can be determined the specific BMP has capacity for the tributary area. Page: 10 File Name: 40.Drainage Report Stamped.20210301.pdf Show calculations for this table. How is required and provided WQCV being calculated? Page: 10 File Name: 40.Drainage Report Stamped.20210301.pdf This column is the amount of WQCV needed after accounting for the pervious pavers and tree canopy credits. If I'm reading this correctly you are saying the extra WQCV for each basin will be routed to the raingardens in basin 6. However Basins 1 and most of 6 are not routed to the raingardens. Please address. Page: 10 File Name: 40.Drainage Report Stamped.20210301.pdf Where is the rain garden that treats a part of Basin 1? A rain garden is not shown on the plans. Is this the flow-well? Show this walkway is treated for WQCV. The landscape buffer BMP is an acceptable method. The drainage report states runoff will be treated by the pervious pavers and any additional runoff routed to the rain gardens. Given the elevations of this downspout that is not feasible. Show basins based on the BMP they are routed to so it can be determined the specific BMP has capacity for the tributary area. Input Calculation Sub Basin Basin Name Total Area Imp. Area Imperv- iousness Req'd WQCV (depth) Req'd WQCV (vol.) Decid. Area Conif. Area Perv. Paver Area Rain Garden Vol. Perv. Paver Ratio Grass Buffer Ratio Canopy Credit Perv. Paver Credit Eff. Imp. Area Eff. Imperv- iousness Eff. WQCV (depth) Net WQCV (#)(sq. ft.)(sq. ft.)(%)(in)(cu. ft.)(sq. ft.)(sq. ft.)(sq. ft.)(cu. ft.)(sq. ft.)(sq. ft.)(sq. ft.)(%)(in)(cu. ft.) 1 NE 1241 1051 85%0.188 19.4 0.0 0.00 0.0 18 2 1 0.0 0 1051 84.7%0.188 1.06 2 East 1362 1089 80%0.171 19.4 0.0 0.00 187.0 0 2 1 0.0 374 715 52.5%0.102 11.61 3 SE 1688 821 49%0.095 13.4 305.0 462.00 285.0 0 2 1 184.4 570 67 3.9%0.014 2.00 4 SW 2132 709 33%0.070 12.4 443.0 295.00 144.0 0 2 1 155.0 288 266 12.5%0.033 5.90 5 West 1516 829 55%0.106 13.5 0.0 183.00 150.0 0 2 1 54.9 300 474 31.3%0.067 8.42 6 NW 1061 676 64%0.126 11.1 0.0 154.00 99.5 37 2 1 46.2 199 431 40.6%0.082 -29.77 Total 9000 5175 58%0.8 89 748 1094 866 55.3 440 1731.0 3004 38%0.49 -0.8 Legend Show calculations for this table. How is required and provided WQCV being calculated? erv. aver atio Grass Buffer Ratio Canopy Credit Perv. Paver Credit Eff. Imp. Area Eff. Imperv- iousness Eff. WQCV (depth) Net WQCV (sq. ft.)(sq. ft.)(sq. ft.)(%)(in)(cu. ft.) 2 1 0.0 0 1051 84.7%0.188 1.06 2 1 0.0 374 715 52.5%0.102 11.61 2 1 184.4 570 67 3.9%0.014 2.00 2 1 155.0 288 266 12.5%0.033 5.90 2 1 54.9 300 474 31.3%0.067 8.42 2 1 46.2 199 431 40.6%0.082 -29.77 This column is the amount of WQCV needed after accounting for the pervious pavers and tree canopy credits. If I'm reading this correctly you are saying the extra WQCV for each basin will be routed to the raingardens in basin 6. However Basins 1 and most of 6 are not routed to the raingardens. Please address. CV Decid. Area Conif. Area Perv. Paver Area Rain Garden Vol. Perv. Paver Ratio Grass Buffer Ratio Canopy Credit Perv. Pa Cred (sq. ft.)(sq. ft.)(sq. ft.)(cu. ft.)(sq. ft.)(sq. ft 9.4 0.0 0.00 0.0 18 2 1 0.0 9.4 0.0 0.00 187.0 0 2 1 0.0 3.4 305.0 462.00 285.0 0 2 1 184.4 2.4 443.0 295.00 144.0 0 2 1 155.0 3.5 0.0 183.00 150.0 0 2 1 54.9 Where is the rain garden that treats a part of Basin 1? A rain garden is not shown on the plans. Is this the flow-well? Page: [4] C2 Site Plan File Name: 90.Civil Permit Set.20210301.pdf Show the Public Improvements on the south side of the property along Hyman Ave. Including ramps. Verify all public improvements meet City Standards. 90.Civil Permit Set.20210301.pdf (19) Page: [4] C2 Site Plan File Name: 90.Civil Permit Set.20210301.pdf The project has triggered a major engineering review. With this trigger the whole site must be brought in to compliance with all public improvement standards. This includes removing the head in parking and replacing it with parallel on street parking. Show this on the site plan. Page: [4] C2 Site Plan File Name: 90.Civil Permit Set.20210301.pdf The landscape plans call this area out as mortar set pavers. Clarify on the civil plans what areas are pervious pavers and used as a BMP and what areas are not. Page: [4] C2 Site Plan File Name: 90.Civil Permit Set.20210301.pdf Call out excavation depth for the pervious pavers in the driplines of these trees. Verify with Parks Dept the trees can withstand the proposed excavation. Page: [4] C2 Site Plan File Name: 90.Civil Permit Set.20210301.pdf Clarify which pipes are perforated underdrain pipes and which are conveyance pipes. Show the Public Improvementson the south side of theproperty along Hyman Ave.Including ramps. Verify allpublic improvements meet CityStandards. The project has triggered amajor engineering review. Withthis trigger the whole site must be brought in to compliancewith all public improvementstandards. This includesremoving the head in parkingand replacing it with parallel on street parking. Show this on thesite plan. The landscape plans call this area out as mortar set pavers. Clarify on the civil plans what areas are pervious pavers and used as a BMP and what areas are not. Call out excavation depth forthe pervious pavers in the driplines of these trees. Verify with Parks Dept the trees can withstand the proposedexcavation. Clarify which pipes are perforated underdrain pipes and which are conveyance pipes. Page: [4] C2 Site Plan File Name: 90.Civil Permit Set.20210301.pdf The sidewalk must be replaced with an ADA compliant sidewalk. The sidewalk shall be 5' in width with a 5' landscape buffer between the back of curb and edge of sidewalk. Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf Show that drainage is routed from the alley to the city gutter. What is the design of the transition? Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf Verify no excavation will take place on the neighbors property to install this curb. Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf the slope in this area exceeds 2:1, how will it be stabilized to ensure no impacts to the neighbor? Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf The curb transition needs to happen onsite so the pan is flush in the alley and a snow plow will not clip this corner. How is drainage from the east routed to the new valleypan? The infrastructure in the ROW must be a public benefit and serve the whole alley. Demonstrate this is the case. The sidewalk must be replaced with an ADA compliant sidewalk. The sidewalk shall be 5' in width with a 5' landscape buffer between the back of curb and edge of sidewalk. Show that drainage is routed from the alley to the city gutter. What is the design of the transition? Verify no excavation will take place on the neighbors property to install this curb. 21 0 S W e s t E n d S t r e e t As p e n , C o l o r a d o 8 1 6 1 1 11 8 W e s t S the slope in this area exceeds 2:1, how will it be stabilized to ensure no impacts to the neighbor? The curb transition needs to happen onsite so the pan is flush in the alley and a snow plow will not clip this corner. How is drainage from the east routed to the new valleypan? The infrastructure in the ROW must be a public benefit and serve the whole alley. Demonstrate this is the case. Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf On grade pavers do not have the pervious paver sub base to provide WQCV volume. Show extents of sub base and verify there is adequate volume within the proposed pervious pavers. Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf In the drainage report address how runoff is routed in to this lower raingarden. Show how the upper rain garden overtops into the lower raingarden. Show enough spot elevations to demonstrate the overflow route of runoff above the WQCV to the ROW. Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf What extent of grading needs to happen within the dripline of the trees to accommodate the new pervious paver patio? Call out enough existing and proposed spot elevations so that Parks Dept can verify the patio is acceptable within the driplines of the trees. Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf Show enough spot elevations to demonstrate how this pipe daylights in to the raingarden. Re v i s i o n # Jo Dr D On grade pavers do not have the pervious paver sub base toprovide WQCV volume. Show extents of sub base and verifythere is adequate volume within the proposed pervious pavers. In the drainage report address how runoff is routed in to this lower raingarden. Show how the upper rain garden overtops into the lower raingarden. Show enough spot elevations to demonstrate the overflow route of runoff above the WQCV to the ROW. What extent of grading needs tohappen within the dripline of thetrees to accommodate the newpervious paver patio? Call outenough existing and proposedspot elevations so that ParksDept can verify the patio is acceptable within the driplines of the trees. Show enough spot elevations to demonstrate how this pipe daylights in to the raingarden. Page: [5] C3 Grading Plan File Name: 90.Civil Permit Set.20210301.pdf This concrete valleypan is not a standard installation for an alley. Can the alley be repaved to a v-shaped alley to meet City alley standards? It is the goal of the Right of Way program to limit unnecessary installations in the ROW so that there are not additional constraints for future ROW needs. Why is this valleypan needed? It appears the alley drains to the north. All infrastructure in the ROW should provide a public benefit. Explain how this infrastructure serves the whole alley. Verify that the valleypan will not disrupt plowing operations. Page: [6] C4 Drainage Plan File Name: 90.Civil Permit Set.20210301.pdf Call out volume capacity of each individual BMP. Call out area that is tributary to that individual BMP. Clearly show that the BMP has adequate volume for the area that is draining to it. Page: [9] C7 Civil Details File Name: 90.Civil Permit Set.20210301.pdf Provide a spec of the sand set Tao Grey Pavers with DG gaps. Demonstrate these pavers meet the standards of the pervious pavers in Chapter 8 of the URMP. Page: [9] C7 Civil Details File Name: 90.Civil Permit Set.20210301.pdf Ful infiltration pervious pavers are called out on the plan view. Provide a detail. This concrete valleypan is not a standard installation for an alley. Can the alley be repaved to a v-shaped alley to meet City alley standards? It is the goal of the Right of Way program to limit unnecessary installations in the ROW so that there are not additional constraints for future ROW needs. Why is this valleypan needed? It appears the alley drains to the north. All infrastructure in the ROW should provide a public benefit. Explain how this infrastructure serves the whole alley. Verify that the valleypan will not disrupt plowing operations. Call out volume capacity of each individual BMP. Call out area that is tributary to that individual BMP. Clearly show that the BMP has adequate volume for the area that is draining to it. Provide a spec of the sand set Tao Grey Pavers with DG gaps. Demonstrate these pavers meet the standards of the pervious pavers in Chapter 8 of the URMP. Ful infiltration pervious pavers are called out on the plan view. Provide a detail. Page: [9] C7 Civil Details File Name: 90.Civil Permit Set.20210301.pdf Call out on the site plan where snowmelted pervious pavers are proposed. Page: [1] L1.0 File Name: 90.Landscape Plan.20210301.pdf Show raingardens and appropriate rain garden plantings on the landscape sheets. 90.Landscape Plan.20210301.pdf (6) Page: [1] L1.0 File Name: 90.Landscape Plan.20210301.pdf What is this wall? It is not shown on the Civil grading plan. Is it existing or proposed? Page: [1] L1.0 File Name: 90.Landscape Plan.20210301.pdf Civil plans call out an asphalt alley. landscape plans call out a gravel alley. Page: [1] L1.0 File Name: 90.Landscape Plan.20210301.pdf Irrigation will be needed in the new landscape buffer along West End St. Call out on the site plan where snowmelted pervious pavers are proposed. ADU B Show raingardens and appropriate rain garden plantings on the landscape sheets. GARAGE SWEDISH (NARROW) ASPENS FOR WINDOW AND SECOND STORY SCREENING SAND-SET ANTIQUE GRANITE PAVERS What is this wall? It is not shown on the Civil grading plan. Is it existing or proposed? CONCRETE GARAGE APRON TIE INTO GRAVEL ALLEY Civil plans call out an asphalt alley. landscape plans call out a gravel alley. EXCEED 30" IN HEIGHT Irrigation will be needed in the new landscape buffer along West End St. Page: [1] L1.0 File Name: 90.Landscape Plan.20210301.pdf The civil plans call out the patios as pervious pavers. The landscape plans call the patios out as sandset pavers. Please make all sheets consistent. If the patios are to be used as stormwater treatment areas sandset pavers do not meet the standards of the URMP. Please address. Page: [1] L1.0 File Name: 90.Landscape Plan.20210301.pdf Demonstrate the TAO Grey Pavers with planted gaps meet the pervious paver specs of the Urban Runoff Management Plan. SAND-SET TAO GRAY PAVERS WITH DG GAPS SHRUB SCREEN NON-IRRIGATED DG CRUSHER FINES OR HIGH AGAINST THE BASE OF TRU 50% SOIL PEP / 50% SMALL NUGGET. 10. VERIFY LOCATIONS OF PERTINEN SECTIONS. IF ANY PART OF THIS PLA CONTACT LANDSCAPE ARCHITECT F 11. ANY DISTURBANCE UNDER EXIST OF THE CITY FORESTER PRIOR TO C EXISTING TREES; NO HEAVY EQUIPM 1 - TOPSOIL OF IRRIGATED GRASSE TURF), SHRUBS, PERENNIALS, AND DEPTH OF AT LEAST 6 INCHES (6”) C LEAST 5 PERCENT (5%) ORGANIC M 2 - TREE SOIL SHOULD HAVE A MIN AND SUBSOIL LAYERS SHALL BE SA LEAST 6 INCHES (6”) AND HAVE 5 PE AND SUBSOIL SHALL HAVE AT LEAS MATTER BY WEIGHT. 3 - A MINIMUM OF FOUR (4) CUBIC Y AMENDMENT PER ONE-THOUSAND BE REQUIRED AS NECESSARY TO M SPECIFICATION. 4 - SOIL AMENDMENT ORGANIC MA CLASS II COMPOST. SOIL AND MULCH The civil plans call out the patios as pervious pavers. The landscape plans call the patios out as sandset pavers. Please make all sheets consistent. If the patios are to be used as stormwater treatment areas sandset pavers do not meet the standards of the URMP. Please address. U P MASTER MORTAR SET TAO GRAY PAVING - 110 SF SAND-SET TAO GRAY PAVERS WITH PLANTED GAPS Demonstrate the TAO Grey Pavers with planted gaps meet the pervious paver specs of the Urban Runoff Management Plan.