36
Appendix B
Appendix B
Conceptual Construction Cost Opinion
Massey Draw Site M-2
Sculpted Shotcrete Drops Glass Fiber Reinforced Concrete (GFRC) for large drop, shotcrete others
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $10,000 $10,000
Earthwork (cut and haul away) CY 3500 $12 $42,000
Large Drop structure (10')concrete SF 1200 $35 $42,000
Small drop structures (1'-2')concrete SF 600 $35 $21,000
Buried Soil Riprap CY 450 $60 $27,000
Restoration/vegetation LS 1 $8,000 $8,000
Erosion control/permits LS 1 $15,000 $15,000
Water Control LS 1 $10,000 $10,000
Survey LS 1 $4,000 $4,000
Subtotal $179,000
Contingency 25% $44,750
Total Construction $223,750
Design Engineering 15% $33,563
Environmental Permits $4,000
Grand Total $261,313
Note: Costs do not include restoration of access routes
and/or staging areas that are outside of project disturbance footprint
Glass Fiber Reinforced Concrete (GFRC) for large drop, shotcrete others
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $10,000 $10,000
Earthwork (cut and haul away) CY 3500 $12 $42,000
Large Drop structure (10') concrete SF 1200 $60 $72,000
Small drop structures (1'-2') concrete SF 600 $35 $21,000
Buried Soil Riprap CY 450 $60 $27,000
Restoration/vegetation LS 1 $8,000 $8,000
Erosion control/permits LS 1 $15,000 $15,000
Water Control LS 1 $10,000 $10,000
Survey LS 1 $4,000 $4,000
Subtotal $209,000
Contingency 25% $52,250
Total Construction $261,250
Design Engineering 15% $39,188
Environmental Permits $4,000
Grand Total $304,438
Note: Costs do not include restoration of access routes
and/or staging areas that are outside of project disturbance footprint
Muller Engineering Company - Sculpted Concrete/shotcrete Drop
Structure Summary Muller Engineering Company has designed and overseen the construction of many sculpted concrete drop structures in the last 7 years. To our knowledge, Muller Engineering Company’s Shop Creek project in 1991 was the first of its kind in the Denver metropolitan area that included soil cement placed and shaped to simulate natural eroded bedrock found in many of the front-range drainageways. Since then we have incorporated several different aspects in our designs including varied layouts, reinforced shotcrete, reinforced concrete, reinforced grout, soil cement, numerous stamping and carving techniques, glass-fiber reinforced concrete panels, color additives, post-construction staining, in-drop water and vegetative basins, and pedestrian crossings. Below is specific information on 5 projects. Grange Hall Creek Constructed in 1999-2001 for the City of Northglenn and UDFCD
Location: Fox Run Parkway north of 104th and East of railroad line (East of Irma Drive). Also located west of Colorado Boulevard. Access via Fox Run Parkway.
Awards:
Colorado Association of Stormwater and Floodplain Managers 2001 Grand Award for Engineering Excellence.
Figure 1 - Sculpted Grade Control Structure.
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Figure 2 - Pedestrian Crossing Incorporated with Grade Control Structure.
Marcy Gulch Constructed in 2000-2002 for the Highlands Ranch Metro District and UDFCD Location: In Highlands Ranch from Town Center Drive (downstream) to Broadway (upstream) Awards:
2003 American Public Works Association Project of the Year Award – Utility, Drainage and Environmental for Medium Communities Category.
2004 International Erosion Control Association’s Environmental Achievement Grand Award.
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Figure 3- Soil Cement Stepped Grade Control Structures.
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Figure 4 - Informal Social Trails Designed into the Crest of the Structures. Primary Pedestrian Crossing Located Upstream of the Structures.
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Upper Big Dry Creek Constructed in 2002-2003 for the Highlands Ranch Metro District and UDFCD Location: In Southeast Highlands Ranch from the Colorado Interstate Gas Easement to the Open Space Conservation Area (near McArthur Ranch Road).
Figure 5 - Low Flow Box Culvert and Trail Crossing Incorporated into Structure. Wetland Vegetative Basin Included Midway up Structure.
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Massey Draw Constructed in 2005 for Jefferson County, Lockheed Martin, and UDFCD in participation with the Denver Botanic Gardens, U.S. Army Corps of Engineers, and Chatfield Watershed Authority. Location: Northeast of the intersection of Wadsworth Boulevard and C-470. Awards:
Finalist for 2006 CASFM Grand Award Finalist for 2005 APWA (Colorado Chapter ) Community Award
Figure 6 – Storm Event over Shotcrete Grade Control Structure with Minimized Footprint.
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Figure 7 - Low Flow Check Dam Type Structure.
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Tallgrass Detention Pond Constructed in 2005-2006 for the East Cherry Creek Valley Water and Sanitation District. Location: Southwest of the intersection E. Hampden Avenue and Picadilly Street.
Figure 8 - 16-Foot High Shotcrete Drop Structure Incorporated with the Forebay at Entrance of Regional Detention Pond. Stained.
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Figure 9 - Side View of 16-Foot High Drop Structure. Wetland Vegetative Basins were Incorporated Mid-Level on the Structure.
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To: Ken Caryl Ranch Master Association From: Chris Kroeger / Muller Engineering Company
(modified by Carolyn Roan)
Date: 12/10/08 Project #: 08-039.01 Re: Drop Structure Aesthetics Summary Muller Engineering Company has designed and overseen the construction of many sculpted concrete/shotcrete drop structures in the last 10 years. In order to better simulate natural eroded bedrock/rock outcroppings, we typically incorporate multiple texture finishes, include staining and or concrete color additives, and locate planting pockets within the structures. The ability of a contractor however, to aesthetically construct the design will vary from one to the other. Thus, determining each contractor’s qualifications and also choosing the appropriate contractor selection process will have a direct impact on the aesthetics of the finished product. We have had the opportunity to work with contractors across the full range of artistic talent, and some contractors are definitely more talented than others with regard to sculpting, texturing, carving, and coloring of the structure. For example, most contractors are limited to using a single color additive, which is mixed with the shotcrete during batching. Others will stain the shotcrete with multiple colors after placement, which creates a more realistic finish. Companies that provide improved artistic craftsmanship will naturally be more expensive due to the additional labor that is required. Typically, the increased cost will range from a quarter to sometimes twice as much for each structure. Locally, Colorado Hardscapes and The Outdoor Living Company specialize in artistic rockwork and can create very realistic products. These companies have constructed several of our designs with high aesthetic quality, but attached to the project is higher construction costs. Usually, after our client determines the level of aesthetics that is desired, we can suggest the appropriate contractor selection process. For example, if the project requires the aesthetic quality that a company like Colorado Hardscapes or The Outdoor Living Company would provide, a non-exclusive open bid process where the low bidder is chosen will likely not work. If low cost is the main goal, the non-exclusive open bid process may be the desired method. It should be understood that regardless of the chosen contractor, all structures will effectively satisfy their primary hydraulic objective. Aesthetic quality is usually the only difference. The following project examples give an idea of various levels of aesthetics. They are arranged by cost, from lowest to highest. The lower end aesthetics would be similar to what is shown in the Massey Draw and Marcy Gulch examples (approximately $25/square foot of drop structure surface). Mid-level aesthetics would be similar to the Stroh at Cherry Creek example ($30/SF). Upper level aesthetics would be similar to Tallgrass Detention Pond and High Point
at DIA examples ($35/SF). The highest level of aesthetics would be obtained from Glass Fiber Reinforced Concrete (GFRC) Panels as shown in Lakewood County Club and Ravenna projects. These cost approximately $60/SF and allow for a more vertical/cliff appearance.
MEMORANDUM
777 S. Wadsworth Blvd. #4-100 Lakewood, Colorado 80226 303/988-4969 FAX 303/988-4939 www.mullereng.com
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Massey Draw This project includes carving and texturing. A single color was added to the shotcrete mix prior to placement.
Marcy Gulch This project includes carving and texturing. A single color was added to the shotcrete mix prior to placement.
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Stroh at Cherry Creek This project includes carving and texturing. Staining using roughly 3-4 colors was performed after the concrete cured. (On this project Muller Engineering Company worked with the contractor, Naranjo Civil Constructors, to improve carving techniques and it was the first time the contractor performed staining. The first picture was a test section prepared at the site that the contractor practiced on. The second is the constructed drop structure.)
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Tallgrass Detention Pond This project includes more detailed carving and texturing. Staining using multiple colors was performed after the shotcrete cured. The structure was constructed by Colorado Hardscapes.
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High Point at DIA This project includes more detailed carving and a blend of two different texture styles. Staining using multiple colors was performed after the shotcrete cured. The structure was constructed by The Outdoor Living Company.
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Lakewood Country Club Glass Fiber Reinforced Concrete (GFRC) Panels
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Ravenna
Glass Fiber Reinforced Concrete (GFRC) Panels
Appendix C
Conceptual Construction Cost Opinion
North Massey Draw Site NM-3
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $10,000 $10,000
Earthwork (cut)* CY 2500 $10 $25,000
Check structures SF 600 $40 $24,000
Grouted boulder edging LF 160 $100 $16,000
Buried soil riprap CY 90 $35 $3,150
24" RCP and end section LF 15 $100 $1,500
4' diameter manhole EA 1 $4,000 $4,000
Restoration/vegetation LS 1 $8,000 $8,000
Erosion control/permits LS 1 $15,000 $15,000
Water Control LS 1 $10,000 $10,000
Survey LS 1 $5,000 $5,000
Subtotal $121,650
Contingency 25% $30,413
Total Construction $152,063
Design Engineering 15% $22,809
Environmental Permits $4,000
Grand Total $178,872
Design with combination of cut and fill to achieve approx. balance in earthwork
Note: Costs do not include restoration of access routes
and/or staging areas that are outside of project disturbance footprint
Appendix D
Conceptual Construction Cost Opinion
North Massey Draw Site NM-7 and NM-9
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $20,000 $20,000
Earthwork (cut)* CY 13500 $10 $135,000
Haul off CY 1300 $5 $6,500
Drop structures-sculpted shotcrete SF 5000 $35 $175,000
Grouted boulder edging LF 300 $100 $30,000
Buried soil riprap CY 400 $35 $14,000
8'x5' CBC / headwalls/wingwalls LF 140 $825 $115,500
Berm grading LF 550 $2 $1,100
Water quality structure/pipe LS 1 $15,000 $15,000
Restoration/vegetation LS 1 $30,000 $30,000
Erosion control/permits LS 1 $20,000 $20,000
Water Control LS 1 $20,000 $20,000
Survey LS 1 $10,000 $10,000
Subtotal $592,100
Contingency 25% $148,025
Total Construction $740,125
Design Engineering/Public Process 15% $111,019
Environmental Permits $7,000
Grand Total $858,144
*Design with combination of cut and fill to limit excess cut generated
Note: Costs do not include restoration of access routes
and/or staging areas that are outside of project disturbance footprint
Appendix E
Conceptual Construction Cost Opinion
Dutch Creek Site D-7
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $10,000 $10,000
Earthwork (cut)* CY 2700 $10 $27,000
Haul off CY 2130 $5 $10,650
Drop structures-sculpted shotcrete SF 1000 $35 $35,000
Buried soil riprap CY 74 $35 $2,590
Restoration/vegetation LS 1 $8,000 $8,000
Erosion control/permits LS 1 $10,000 $10,000
Water Control LS 1 $5,000 $5,000
Survey LS 1 $5,000 $5,000
Subtotal $113,240
Contingency 25% $28,310
Total Construction $141,550
Design Engineering 15% $21,233
Environmental Permits $4,000
Grand Total $166,783
*Design with combination of cut and fill to limit excess cut generated
Note: Costs do not include restoration of access routes
and/or staging areas that are outside of project disturbance footprint
Appendix F
Conceptual Construction Estimates
for select Maintenance Sites
Site SD 4-2: More expensive culvert cleanout
Description of work: Excavate downstream channel to unbury culvert outlet (approx. 22" sediment accumulation). Length of excavation approx. 60 feet to catch
grade. Trees located in excavation zone need to be trimmed and/or removed (at least 1 removal required). Excavate 2' bottom width with 3:1 side slopes (trapezoidal)
cross section. *Assumes County will clean culvert, although it extends beyond ROW, so price for cleanout provided below.
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $2,000 $2,000
Tree removal EA 1 $300 $300
Excavation/haul off CY 30 $20 $600
Trees trim LS 1 $500 $500
Reseeding LS 1 $200 $200
Total $3,600
* Option: Culvert cleanout LS 1 $2,000
Site SD 3-1 or Site SD 2-7 : Less expensive culvert cleanout
Description of work: Excavate downstream channel to unbury culvert outlet (approx. 14" sediment accumulation). Length of excavation approx. 35 feet to catch
grade. Little to no tree removal or trimming work. Lower existing channel bottom. No need for additional bottom width shaping.
*Assumes County will clean culvert, although it extends beyond ROW, so price for cleanout provided below.
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $2,000 $2,000
Excavation/haul off CY 5 $20 $100
Reseeding LS 1 $200 $200
Total $2,300
* Option: Culvert cleanout LS 1 $2,000
Site SD 2-5 : Channel Excavation
Description of work: Widen channel away from trees and home, remove old structure in channel (flume). Reset riprap in channel bottom.
Widen to approx. 5 ' bottom width, 3' total depth, for length of approx. 85 linear feet. Due to steep longitudinal slopes, erosion blanket on all.
Item Unit Quantity Unit Cost Total
Mobilization LS 1 $2,000 $2,000
Survey LS 1 $2,000 $2,000
Excavation/haul off CY 71 $20 $1,420
Remove structure LS 1 $1,000 $1,000
Reset riprap LS 1 $500 $500
Erosion control blanket (coconut) SY 150 $5 $750
Reseeding** LS 1 $300 $300
Total $7,970
**Note: Does not include revegetation of access route to site
No grading permit required (<300 CY material)
Willow Stake Instructions Willow stake Collection: Live young stem willow stakes of the proper species shall be collected from designated or approved growing sources in the immediate area. Use extreme care to avoid damage to all remaining plants in harvest areas. Willow stakes shall be in a dormant state (Fall to early March). A maximum of 50% of the parent plants branches may be pruned for willow stakes. Collect willow stakes shall be taken from the parent plant with pruning shears. The base cut shall be angle cut, and any top cuts shall be blunt to ensure upright planting. All plant materials shall be handled with care to avoid bark stripping and trunk wood splitting. Willow stake lengths shall be 3 to 5 feet. Shrub willow stakes shall be ½ inch in diameter, maximum. Tree willow stakes shall be 1 inch in diameter, maximum. Trim all side branches and leaves. Live branch willow stakes shall be bound together securely with twine at the collection site for ease of handling and protection during transport. Live cut materials shall be protected from drying at all times. Willow stakes not installed immediately shall be kept butt end in water and stored in protected locations where they are shaded and sheltered from the wind. These shall be planted within two days of collection. Willow stakes shall be continually protected from freezing.
Live stakes shall be tamped into the ground to the approximate depth of the water table (or below channel bottom elevation if groundwater not known) and shall protrude from the ground surface 6” or less. Prepare a pilot hole by hammering #5 rebar or drilling with a 3” diameter auger in the entire depth of cutting or other approved method. The cutting shall be tapped into the hole with rubber mallets or dead blow hammers so as not to split the wood. Carpenter or sledge hammers are not acceptable staking tools. Holes shall be backfilled as necessary so that no voids remain around the cutting. Space approximately 2 feet apart.
Plant Willow Stakes: Planting operations shall be conducted under favorable weather conditions. No planting shall be undertaken when freezing temperatures are forecasted 24 hours in advance. Planting shall not be done in soil that is frozen, excessively moist, or otherwise in a condition not satisfactory for planting in accordance with accepted horticultural practice.
