2024-1-19_Fourmile MTB Park PlansR.pdf

PDF 10 MB Posted Jan 19, 2024

Attached to: Fourmile Mountain Bike Park (formerly known as Copper Creek Mountain Bike Park)
Solicitation number: 2024-002
Issued by: Dallas County, Iowa

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Written by GovTribe AI · Apr 10, 2025

The document is a comprehensive set of construction plans for the Fourmile Mountain Bike Park project, prepared by Snyder & Associates for Polk County Conservation in Des Moines, Iowa. The project involves constructing approximately 3.2 miles of natural surface mountain bike trails across 49.9 acres, with an estimated total trail length of 17,660 linear feet. The plans detail trail construction techniques, erosion control measures, trail features, and specific design elements including directional trails, adaptive mountain bike trails, and a gravity zone with various technical trail features such as rock gardens, rock drops, and bermed turns.

The project is located at 1601 Williams Street and includes multiple trail segments with varying difficulty levels, including directional and down-slope trails rated from low to high difficulty. The estimated project area is 2,177,527 square feet, with careful consideration given to environmental preservation, including maintaining existing vegetation and minimizing tree removal. The trail system is designed with sustainable construction methods to prevent erosion, including grade reversals, specific trail tread techniques, and strategic placement to follow natural contours. The project involves complex earthwork, rock armoring, and specialized trail building techniques, with a focus on creating a low-maintenance, environmentally sensitive mountain bike park that integrates with the existing landscape.

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Other files

File	Type	Posted
Fourmile MTB Park_Addendum No 1.pdf	PDF	Jan 19, 2024
2024-01-19_BidDocFourMileMTB.pdf	PDF	Jan 19, 2024
Fourmile MTB Park_Addendum No 2.pdf	PDF	Jan 19, 2024

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CONSTRUCTION PLANS

FOR

FOUR MILE MTB PARK

ITB NUMBER: 2024-002

1601 WILLIAMS STREET

CITY OF DES MOINES, POLK COUNTY, IOWA

SCALE: 1" = 400'

OWNER / DEVELOPER

POLK COUNTY CONSERVATION

12130 NW 128TH STREET

GRANGER, IOWA, 50109

CONTACT: ADAM FENDRICK

(515)323-5309

ENGINEER

SNYDER & ASSOCIATES

2727 SW SNYDER BLVD

ANKENY, IOWA 50023

CONTACT:

TIM WEST, PLA

(515) 964-2020

TANNER VOLK, LA IT

Office: 515.964.2020

PROJECT LOCATION

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COPPER CREEK LAKE

NE 23RD AVE.

SS ON LA

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License Expires:

June 30, 2025

TIMOTHY L.

WEST

LANDSCAPE

ARCHITECT

NO.

Timothy L. West, PLA

License Number

Pages or sheets covered by this seal:

Date

I hereby certify that the portion of this technical submission described below was prepared by me or under my direct supervision and responsible charge. I am a duly licensed Professional Landscape Architect under the laws of the State of Iowa.

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Sheet List Table Sheet Number Sheet Title

C000 TITLE SHEET

C001 PROJECT INFORMATION

C002 TRAIL CONSTRUCTION NOTES

C003 EXISTING CONDITIONS

C004 ESTIMATE REFERENCE

C100 OVERALL SITE PLAN

C101 SITE ENLARGEMENT SW

C102 SITE ENLARGEMENT NW

C103 SITE ENLARGEMENT NE

C104 SITE ENLARGEMENT SE

C105 SITE ENLARGEMENT CREEK CROSSING

C106 SITE ENLARGEMENT GRAVITY ZONE

C200 EROSION CONTROL NOTES

C201 EROSION CONTROL SW

C202 EROSION CONTROL NW

C203 EROSION CONTROL NE

C204 EROSION CONTROL SE

C300 TRAIL CONSTRUCTION DETAILS

C301 TRAIL CONSTRUCTION DETAILS

C302 GRAVITY ZONE DETAILS

C400 TRAIL SCHEDULE

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GENERAL NOTES

1. NOTIFY UTILITY PROVIDERS PRIOR TO BEGINNING ANY CONSTRUCTION

ACTIVITIES AND COORDINATE WITH UTILITY PROVIDERS AS NECESSARY

DURING CONSTRUCTION. CONTRACTOR IS RESPONSIBLE FOR

DETERMINING EXISTENCE, EXACT LOCATION, AND DEPTH OF ALL

UTILITIES. PROTECT ALL UTILITY LINES AND STRUCTURES NOT SHOWN

FOR REMOVAL OR MODIFICATION. ANY DAMAGES TO UTILITY ITEMS NOT

SHOWN FOR REMOVAL OR MODIFICATION SHALL BE REPAIRED TO THE

UTILITY OWNER'S SPECIFICATIONS AT THE CONTRACTOR'S EXPENSE.

2. CONSTRUCTION OF ALL STREET AND UTILITY IMPROVEMENTS SHALL

CONFORM TO THE URBAN STANDARD SPECIFICATIONS FOR PUBLIC

IMPROVEMENTS AND THE SOILS REPORTS PREPARED BY OTHERS.

3. LENGTH OF UTILITIES SHOWN ON PLANS ARE DIMENSIONED FROM

CENTERLINE OF STRUCTURE TO CENTERLINE OF STRUCTURE.

4. ALL TRAFFIC CONTROL SHALL BE PROVIDED IN ACCORDANCE WITH

REQUIREMENTS SET FORTH IN THE MANUAL ON UNIFORM TRAFFIC

CONTROL DEVICES (MUTCD). WHEN CONSTRUCTION ACTIVITIES

OBSTRUCT PORTIONS OF THE ROADWAY, FLAGGERS SHALL BE

PROVIDED. FLAGGERS SHALL CONFORM TO THE MUTCD IN

APPEARANCE, EQUIPMENT AND ACTIONS.

5. NOTIFY OWNER, ENGINEER, DES MOINES WATER WORKS, AND POLK

COUNTY PUBLIC WORKS AT LEAST 48 HOURS PRIOR TO BEGINNING

WORK.

6. CONSTRUCT MANHOLES AND APPURTENANCES AS WORK PROGRESSES.

BACKFILL WITH SUITABLE MATERIAL AND COMPACT TO 95% MAXIMUM

DENSITY.

7. IN THE EVENT OF A DISCREPANCY BETWEEN THE QUANTITY ESTIMATES

AND THE DETAILED PLANS, THE DETAILED PLANS SHALL GOVERN.

8. ALL FIELD TILES ENCOUNTERED DURING CONSTRUCTION SHALL BE

RECONNECTED AND NOTED ACCORDINGLY ON THE AS-BUILT

DOCUMENTS.

9. DIMENSIONS, BUILDING LOCATION, UTILITIES AND GRADING OF THIS SITE

ARE BASED ON AVAILABLE INFORMATION AT THE TIME OF DESIGN.

DEVIATIONS MAY BE NECESSARY IN THE FIELD. ANY SUCH CHANGES OR

CONFLICTS BETWEEN THIS PLAN AND FIELD CONDITIONS ARE TO BE

REPORTED TO THE ARCHITECT/ENGINEER PRIOR TO STARTING

CONSTRUCTION. THE CONTRACTOR SHALL BE RESPONSIBLE FOR

LAYOUT VERIFICATION OF ALL SITE IMPROVEMENTS PRIOR TO

CONSTRUCTION.

10. CONTRACTOR TO LOAD AND TRANSPORT ALL MATERIALS CONSIDERED

TO BE UNDESIRABLE TO BE INCORPORATED INTO THE PROJECT TO AN

APPROVED OFF-SITE WASTE SITE.

11. CONTRACTOR TO STRIP AND STOCKPILE TOPSOIL FROM ALL AREAS TO

BE CUT OR FILLED. RESPREAD TO MINIMUM 6" DEPTH TO FINISH

GRADES.

12. ALL PROPOSED CONTOURS AND SPOT ELEVATIONS SHOWN ARE

FINISHED GRADES AND/OR TOP OF PAVING SLAB (GUTTER), UNLESS

OTHERWISE NOTED.

13. THE CONTRACTOR IS RESPONSIBLE FOR CLEANING DIRT AND DEBRIS

FROM NEIGHBORING STREETS, DRIVEWAYS, AND SIDEWALKS CAUSED

BY CONSTRUCTION ACTIVITIES IN A TIMELY MANNER.

14. THE ADJUSTMENT OF ANY EXISTING UTILITY APPURTENANCES TO FINAL

GRADE IS CONSIDERED INCIDENTAL TO THE SITE WORK.

15. THE CONTRACTOR SHALL BE RESPONSIBLE FOR INSTALLING EROSION

CONTROL MEASURES AS NECESSARY. CONTRACTOR SHALL ALSO BE

RESPONSIBLE FOR MAINTAINING ANY EXISTING EROSION CONTROL

MEASURES ON SITE AT THE TIME OF CONSTRUCTION. GRADING AND

SOIL EROSION CONTROL CODE REQUIREMENTS SHALL BE MET BY

CONTRACTOR. A GRADING PERMIT IS REQUIRED FOR THIS PROJECT.

16. CONTRACTOR TO COORDINATE NATURAL GAS, ELECTRICAL, TELEPHONE

AND ANY OTHER FRANCHISE UTILITY SERVICES WITH UTILITY SERVICE

PROVIDER, POLK COUNTY, AND THE OWNER PRIOR TO CONSTRUCTION.

17. CONTRACTOR TO VERIFY ALL UTILITY CROSSINGS AND MAINTAIN

MINIMUM 18" VERTICAL AND HORIZONTAL CLEARANCE BETWEEN

UTILITIES. CONTRACTOR TO COORDINATE UTILITY ROUTING TO BUILDING

AND VERIFY CONNECTION LOCATIONS AND INVERTS PRIOR TO

CONSTRUCTION.

18. CONTRACTOR SHALL BE AN ACTIVE MEMBER IN THE PROFESSIONAL

TRAILBUILDER'S ASSOCIATION OR AN APPROVED EQUAL PRIOR TO THE

START OF CONSTRUCTION. CONTRACTOR TO PROVIDE AT LEAST TWO

REFERENCES OF PREVIOUS TRAIL PROJECTS COMPLETED WITHIN THE

PAST 3 YEARS AND SPECIFICATIONS USED.

USE

PUBLIC RECREATION AREA - MOUNTAIN BIKE PARK

PROPERTY ADDRESS

1601 WILLIAMS STREET, DES MOINES, IOWA

EXISTING ZONING

P1, WITH CONDITIONAL ZONING

PROPOSED ZONING

P1, WITH CONDITIONAL ZONING

REZONING INFORMATION

PLAN AND ZONING COMMISSION

DATE: 9/15/2022

COMMISSION ACTION: TODD GARNER MADE A MOTION TO APPROVED THE

REQUEST TO REZONE THE PROPERTY FROM “F” FLOOD DISTRICT AND “N3A”

RESIDENTIAL DISTRICT TO “P1” PUBLIC, CIVIC, AND INSTITUTIONAL DISTRICT

SUBJECT TO ALL AREAS WITHIN THE FEMA 100 YEAR FLOODPLAIN BE

DEVELOPED PURSUANT TO CHAPTER 50 OF DES MOINES MUNICIPAL CODE.

THE VOTE: 10-1 (WILL PAGE VOTED IN OPPOSITION)

CITY COUNCIL

DATE: 10/24/2022

MOTION: MOVED BY WESTERGAARD TO ADOPT, SECOND BY GATTO. MOTION

CARRIED 7-0.

ORDINANCE NO.: 16,184

ROLL CALL: 22-1666

BULK REGULATIONS

NO PARKING PROPOSED IN THE FOUR MILE MTB PARK PROJECT. SEE FOUR

MILE TRAILHEAD PROJECT.

IMPERVIOUS SURFACE

TOTAL PROJECT AREA = 2,177,527 SF (49.9 AC)

EXISTING IMPERVIOUS SURFACE = 29,721 SF

PROPOSED IMPERVIOUS SURFACE = 0 SF

TOTAL ADDED IMPERVIOUS SURFACE = 0 SF

BUILDING INFORMATION

NONE PROPOSED FOR THIS CONSTRUCTION SET.

FEMA FIRM INFORMATION

FIRM PANEL: 19153C0360F EFFECTIVE DATE: 2/1/2019

ZONE AE SPECIAL FLOOD HAZARD AREA 100 YEAR FLOOD ELEVATION: 807'

CITY OF DSM DATUM ELEVATION FOR 100 YEAR FLOOD ELEVATION: 801.50'

R18 ALL WORK IN THE CITY R.O.W. REQUIRES A RIGHT-OF-WAY PERMIT

(CHAPTER 102, ARTICLE IX, DIVISION 2, DES MOINES MUNICIPAL CODE).

S19. WATER SERVICE MUST MEET UNIFORM PLUMBING CODE (UPC) AND ALL

CITY OF DES MOINES AMENDMENTS TO UPC. DEVELOPER / CONTRACTOR TO

VERIFY PIPE MATERIAL AND REQUIREMENTS PRIOR TO CONSTRUCTION.

SURVEY NOTES

1. BUILDING LINES AND CORNERS ARE FOR USE IN PREPARING CIVIL SITE

PLAN DOCUMENTS. BUILDING CORNERS AND BUILDING LINES SHOULD

BE SPECIFICALLY VERIFIED, AS NECESSARY, PRIOR TO DESIGN FOR

CONSTRUCTION OF ANY PROPOSED EXPANSION OR CONNECTION OF

BUILDING COMPONENTS.

2. FOR CLARITY PURPOSES, SURVEY SPOT ELEVATIONS ARE NOT SHOWN

ON THIS SURVEY, BUT ARE CONTAINED WITHIN THE DIGITAL CADD FILES.

3. FOR THE PURPOSE OF THIS SURVEY, STORM SEWER, SANITARY SEWER

AND WATER MAIN LINES ARE ASSUMED TO FOLLOW A STRAIGHT LINE

FROM STRUCTURE TO STRUCTURE.

4. UTILITY SERVICE LINES TO BUILDINGS ARE APPROXIMATE ONLY. AN

INTERNAL BUILDING INVESTIGATION, EXCAVATION AND/OR SUBSURFACE

LOCATING/DESIGNATING WOULD NEED TO BE PERFORMED TO

DETERMINE THE LOCATION OF SERVICES ENTERING THE BUILDING.

UTILITY CONTACT INFORMATION

UTILITY CONTACT FOR MAPPING INFORMATION SHOWN BELOW.

G1-GAS MAIN 515-242-4224

(M57G) MID AMERICAN -GAS

Contact Name: Tim Davis Contact Phone: 515-242-4224 Contact Email: TLDavis@midamerican.com

CO1-COMMUNICATION 515-246-2252

(T15) MEDIACOM COMMUNICATIONS CORP.

Contact Name: Paul May Contact Phone: 515-246-2252 Contact Email: pmay@mediacomcc.com

FO1-FIBER OPTIC 816-275-4014

AT2) AT&T TRANSMISSION

Contact Name: Lenny Vohs Contact Phone: 816-275-4014 Contact Email: lv2121@att.com

FO2-FIBER OPTIC 701-866-7952

(CTLIA01) CENTURYLINK

Contact Name: Brandon Aman Contact Phone: 701-866-7952 Contact Email: baman@terratechllc.net

OE1-OVERHEAD ELECTRIC

(M57E) MIDAMER- ELEC 515-242-4224

Contact Name: Tim Davis Contact Phone: 515-242-4224 Contact Email: TLDavis@midamerican.com

W1-WATER MAIN 515-323-6204

(DWW) Des Moines Water Works Contact Name: Bryan Pollpeter Contact Phone: 515-323-6204 Contact Email: bpollpet@dmww.com

UTILITY QUALITY SERVICE LEVELS

QUALITY LEVELS OF UTILITIES ARE SHOWN IN THE PARENTHESES WITH THE UTILITY

TYPE AND WHEN APPLICABLE, SIZE. THE QUALITY LEVELS ARE BASED ON THE CI /

ASCE 38-02 STANDARD.

QUALITY LEVEL (D) INFORMATION IS DERIVED FROM EXISTING UTILITY RECORDS OR

ORAL RECOLLECTIONS.

QUALITY LEVEL (C) INFORMATION IS OBTAINED BY SURVEYING AND PLOTTING

VISIBLE ABOVE-GROUND UTILITY FEATURES AND USING PROFESSIONAL JUDGMENT

IN CORRELATING THIS INFORMATION WITH

QUALITY D INFORMATION.

QUALITY LEVEL (B) INFORMATION IS OBTAINED THROUGH THE APPLICATION OF

APPROPRIATE SURFACE GEOPHYSICAL METHODS TO DETERMINE THE EXISTENCE

AND APPROXIMATE HORIZONTAL POSITION OF SUBSURFACE UTILITIES.

QUALITY LEVEL (A) IS HORIZONTAL AND VERTICAL POSITION OF UNDERGROUND

UTILITIES OBTAINED BY ACTUAL EXPOSURE OR VERIFICATION OF PREVIOUSLY

EXPOSED SUBSURFACE UTILITIES, AS WELL AS THE TYPE, SIZE, CONDITION,

MATERIAL, AND OTHER CHARACTERISTICS.

UTILITY WARNING

THE UTILITIES SHOWN HAVE BEEN LOCATED FROM FIELD SURVEY

INFORMATION AND/OR RECORDS OBTAINED. THE SURVEYOR MAKES NO

GUARANTEE THAT THE UTILITIES OR SUBSURFACE FEATURES SHOWN

COMPRISE ALL SUCH ITEMS IN THE AREA, EITHER IN SERVICE OR ABANDONED.

THE SURVEYOR FURTHER DOES NOT WARRANT THAT THE UTILITIES OR

SUBSURFACE FEATURES SHOWN ARE IN THE EXACT LOCATION INDICATED

EXCEPT WHERE NOTED AS QUALITY LEVEL A.

SNYDER CONTROL POINTS

IOWA SOUTH STATE PLANE COORDINATE SYSTEM

NAD83(2011)(EPOCH 2010.00) IARTN DERIVED - US SURVEY FEET

CP1 N=587564.10 E=1631659.1 Z=830.947

CUT X BOC NE QUAD WILSON AVE & E 42nd ST. @ CURB DROP

(AS SHOWN ON SURVEY)

CP2 N=586723.114 E=1631322.995 Z=802.568

CUT X N BOC WILLIAMS ST @ BOC INT, +/- 25' W OF 42nd ST, +/- 75'

S OF E JEFFERSON AVE (AS SHOWN ON SURVEY)

CP3 N=585771.93 E=1631282.722 Z=800.326

CUT X W BOC WILLIAMS ST @ BOC INT, +/- 5' S OF TRAIL, +/- 10' S

OF PARK ENTRANCE (AS SHOWN ON SURVEY)

CP4 N=587304.743 E=1633761.085 Z=850.402

CUT X W SIDE STORM STRUCTURE, +/- 25' E OF NE 45th CT, +/- 25'

S OF DRIVEWAY HOUSE #2065 (AS SHOWN ON SURVEY)

CP5 N=586303.937 E=1632969.978 Z=855.167

SET MAG NAIL CL NE 19th AVE @ END OF ROAD, IN FRONT OF

HOUSE #4405 (AS SHOWN ON SURVEY)

CP6 N=585763.597 E=1632711.761 Z=814.907

CUT X BOC SHORLINE DRIVE, +/- 10' S OF END ROAD, +/-50' N OF

INTERSECTION (AS SHOWN ON SURVEY)

BENCHMARKS

NORTH AMERICAN VERTICAL DATUM OF 1988 (NAVD88 - GEOID12A)

IARTN DERIVED - US SURVEY FEET

BM500 ELEV=803.046

NW BOLT HYD, +/- 20' E OF WILLIAMS ST, +/- 20' S OF COPPER

CREEK PARK ENTRANCE

DATE OF SURVEY

AUGUST 31st ,2023

FEATURES EXISTING PROPOSED

Spot Elevation Contour Elevation Fence (Barbed, Field, Hog) Fence (Chain Link) Fence (Wood) Fence (Silt) Tree Line Tree Stump

Deciduous Tree \\ Shrub

Coniferous Tree \\ Shrub

Communication Overhead Communication Fiber Optic Underground Electric Overhead Electric Gas Main with Size High Pressure Gas Main with Size Water Main with Size Sanitary Sewer with Size Duct Bank Test Hole Location for SUE w/ID

(*) Denotes the survey quality service level for utilities

Sanitary Manhole

Storm Sewer with Size Storm Manhole Single Storm Sewer Intake Double Storm Sewer Intake Fire Hydrant Fire Hydrant on Building Water Main Valve Water Service Valve Well Utility Pole Guy Anchor Utility Pole with Light Utility Pole with Transformer Street Light Yard Light Electric Box Electric Transformer Traffic Sign Communication Pedestal Communication Manhole Communication Handhole Fiber Optic Manhole Fiber Optic Handhole Gas Valve Gas Manhole Gas Apparatus Fence Post or Guard Post Underground Storage Tank Above Ground Storage Tank Sign Satellite Dish Mailbox Sprinkler Head Irrigation Control Valve

LEGEND

X 1225.25

X1225 1225.25

FEATURES FOUND SET

Section Corner 1/2" Rebar, Cap # 11579

(Unless Otherwise Noted) ROW Marker ROW Rail Control Point Bench Mark Platted Distance P Measured Bearing & Distance M Recorded As R Deed Distance D Calculated Distance C Minimum Protection Elevation MPE Centerline Section Line 1/4 Section Line 1/4 1/4 Section Line Easement Line

CITY GENERAL NOTES

A. THIS SITE SHALL BE MAINTAINED IN COMPLIANCE WITH ALL CITY CODE

APPLICABLE ON THE DATE OF SITE PLAN APPROVAL.

B. ALL ROOFTOP MECHANICAL EQUIPMENT MUST BE SCREENED ON ALL

SIDES WITH ARCHITECTURAL SCREENING EQUAL TO THE HEIGHT OF THE

EQUIPMENT.

C. MECHANICAL EQUIPMENT SHALL NOT BE LOCATED IN THE FRONT YARD

OR STREET SIDE YARD AND SHALL BE SCREENED FROM VIEW FROM ANY

PUBLIC WAY WITH LANDSCAPING, FENCING, OR WALLS CONSISTENT

WITH THE BUILDING DESIGN, COLORS, AND MATERIALS.

D. ANY AMENDMENTS OR CHANGES TO THE PROJECT SITE THAT DO NOT

MEET WHAT IS SHOWN ON THE SITE PLAN NEED TO BE APPROVED WITH

THE PERMIT AND DEVELOPMENT CENTER PRIOR TO

INSTALLATION/CONSTRUCTION.

E. ALL DISTURBED AREAS SHOULD BE RESTORED BY SEEDING OR

SODDING.

F. NO EXTERIOR DUMPSTER WILL BE PROVIDED ON SITE.

G. ANY WORK INVOLVING BUILDING, ELECTRICAL, MECHANICAL OR

PLUMBING SYSTEMS WILL REQUIRE A CITY PERMIT.

H. CONTRACTOR TO APPLY FOR A CITY OF DES MOINES GRADING PERMIT

PRIOR TO CONSTRUCTION.

I. DRIVEWAY APPROACH & CLOSURE WORK REQUIRES A SIDEWALK/ DRIVE

APPROACH PERMIT THROUGH CITY OF DES MOINES PRIOR TO

CONSTRUCTION.

J. ALL WORK IN THE CITY RIGHT-OF-WAY SHALL BE DONE IN ACCORDANCE

WITH SUDAS AND THE CITY OF DES MOINES GENERAL SUPPLEMENTAL

SPECIFICATIONS TO SUDAS EFFECTIVE AT THE TIME OF PLAN

APPROVAL.

K. ALL WORK IN THE CITY RIGHT-OF-WAY (INCLUDING CONSTRUCTION OF

PUBLIC SIDEWALK OR DRIVE APPROACH) REQUIRES A RIGHT-OF-WAY

PERMIT.

L. ANY EXCESS EARTH MATERIAL GENERATED FROM CONSTRUCTION

MUST BE HAULED TO THE ONSITE GRAVITY ZONE / EARTH FEATURE FOR

INCORPORATION IN TO CONSTRUCTION. THIS AREA IS LOCATED

OUTSIDE OF THE FLOOD PLAIN.

M. CONTRACTOR REQUIRED TO APPLY FOR AND OBTAIN AN NPDES

GENERAL PERMIT #2 PRIOR TO CONSTRUCTION.

N. LIGHTING MUST BE LOW GLARE CUT OFF TYPE FIXTURES TO REDUCE

THE GLARE OF LIGHT POLLUTION ON SURROUNDING PROPERTIES.

LEGAL DESCRIPTION

THE SOUTH 51.75 FEET OF LOT 11 IN REEDBURY, AN OFFICIAL PLAT, NOW

INCLUDED IN AND FORMING A PART OF THE CITY OF DES MOINES, POLK

COUNTY, IOWA; AND COMMENCING AT THE SOUTHEAST CORNER OF LOT 11

IN REEDBURY, AN OFFICIAL PLAT, THENCE SOUTH 204.25 FEET, THENCE

WEST 584.83 FEET TO THE EAST LINE OF 42ND/ ST., THENCE NORTH 204.25

FEET ALONG THE EAST LINE OF 42ND/ ST. TO A POINT IN LINE WITH THE

SOUTH LINE OF LOT 11, THENCE EAST 584.83 FEET TO THE POINT OF

BEGINNING, SAID PROPERTY BEING SITUATED IN THE NORTHWEST 1/4 OF

THE NORTHEAST 1/4 OF SECTION 33, TOWNSHIP 79 NORTH, RANGE 23 WEST

OF THE 5TH P.M., CITY OF DES MOINES, POLK COUNTY IOWA; AND THE

SOUTHWEST 1/4 OF THE NORTHEAST 1/4 OF SECTION 33, TOWNSHIP 79

NORTH, RANGE 23 WEST OF THE 5TH P.M., CITY OF DES MOINES, POLK

COUNTY, IOWA.

AND

LOTS 9-100, ELMWOOD PARK, AN OFFICIAL PLAT IN THE CITY OF DES MOINES,

POLK COUNTY, IOWA LYING EAST OF WILLIAMS CT.

AND

THE VACATED EAST 42ND/ STREET LYING EAST OF WILLIAMS ST AND

WILLIAMS CT AND PRESENTLY ESTABLISHED EAST 42N/D /STREET ALL BEING

A PART OF THE SOUTHWEST 1/4 OF THE NORTHEAST 1/4 OF SECTION 33,

TOWNSHIP 79 NORTH, RANGE 23 WEST OF THE 5TH P.M., CITY OF DES

MOINES, POLK COUNTY, IOWA.

AND

THE VACATED EAST WASHINGTON AVE LYING EAST OF WILLIAMS ST. AND

NORTH OF THE SOUTH LINE OF THE SOUTHWEST 1/4 OF THE NORTHEAST 1/4

OF SECTION 33, TOWNSHIP 79 NORTH, RANGE 23 WEST OF THE 5TH P.M.,

CITY OF DES MOINES, POLK COUNTY, IOWA.

5. UNDERGROUND PIPE MATERIALS AND SIZES ARE BASED UPON VISIBLE

EVIDENCE VIEWED FROM ACCESS MANHOLES/STRUCTURES. DUE TO THE

CONFIGURATION AND/OR CONSTRUCTION OF THE STRUCTURE, IT MAY BE

DIFFICULT TO ACCURATELY DETERMINE THE PIPE MATERIAL AND/OR SIZE.

THE SURVEYOR WILL USE THEIR JUDGMENT AND EXPERIENCE TO ATTEMPT

TO DETERMINE, BUT COMPLETE ACCURACY CANNOT BE GUARANTEED.

6. BOUNDARY LINES SHOWN ON THE EXISTING SITE SURVEY ARE TO

FACILITATE DESIGN OR CONCEPT NEEDS AND ENABLE CREATION OF SAID

CONSTRUCTION DOCUMENTS. THESE LINES DO NOT CONSTITUTE A

CERTIFIED BOUNDARY SURVEY AND MISSING MONUMENTS WILL NOT BE SET.

DESIGN ALTERNATIVE

1. WAVE REQUIREMENT TO ROUTE EXISTING UTILITIES UNDERGROUND.

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NOTES

1. Building lines and corners are for use in preparing civil site plan documents. Building corners and building lines should be specifically verified, as necessary, prior to design for construction of any proposed expansion or connection of building components.

2. For clarity purposes, survey spot elevations are not shown on this survey, but are contained within the digital CADD files.

3. For the purpose of this survey, storm sewer, sanitary sewer and water main lines are assumed to follow a straight line from structure to structure.

4. Utility service lines to buildings are approximate only. An internal building investigation, excavation and/or subsurface locating/designating would need to be performed to determine the location of services entering the building.

5. Underground pipe materials and sizes are based upon visible evidence viewed from access manholes/structures. Due to the configuration and/or construction of the structure, it may be difficult to accurately determine the pipe material and/or size. The surveyor will use their judgment and experience to attempt to determine, but complete accuracy cannot be guaranteed.

6. Boundary lines shown on the existing site survey are to facilitate design or concept needs and enable creation of said construction documents.

These lines do not constitute a certified boundary survey and missing monuments will not be set.

GENERAL TRAIL CONSTRUCTION NOTES

Description Work under this item shall include all work, materials, labor, and incidentals necessary for the contractor to provide, install, and construct the portions of natural surface trails as shown on the plans. This project includes construction of vertical undulations / features and the construction of turns as called for on the plans.

This project also includes grubbing stumps in the trail tread and flush cutting stumps in the trail corridor, see item 1.19 below for further detail. Natural surface trails will use rolling contour and lift and tilt (where required for drainage) construction methods and will have a varying frequency of rollers, berms and tabletop and rolling gap jumps as quantified in construction documents. Existing barbed wire and hog fence present on site shall be removed by contractor and shall be considered incidental to the unit rate for natural surface trails. The tread will be natural surface constructed by a contractor part of the professional trail builders association. Natural surface trails special provision shall cover all-natural surface trail bid items regardless of naming (adaptive trad. Trail, trad. trail, gravity trail, MBO trail, hiking trail, etc.).

All trail work shall be done according to the specifications and typical details included in this document. When field conditions do not pertain to specifications provided the work shall be done in accordance with the 2007 edition of the USDA trail construction and maintenance notebook, the 2007 edition of managing mountain biking, 2004 edition of the IMBA trail solutions guide, and the 2017 edition of guidelines for a quality trail experience. Refer to these publications for details and descriptions of trail maintenance and construction. Deviation from these specifications will be allowed with the permission or at the direction of the owner.

1. Trail Alignment Trail alignments have been previously flagged in the field by Owner, these flag lines represent the downhill edge of tread as well as the approved corridor. The approved corridor extends 20' on each side of original flag line. The Owner may approve adjustments to the flag line within this corridor to improve sustainability, improve the trail experience, reduce impact, and improve build efficiency. Material, such as stone, may be harvested within this corridor as long as that harvesting does not negatively impact the trail experience or stability. Trail contractor shall create an exact final alignment and location for each trail and trail feature. The alignments and locations shall meet appropriate specifications as provided in the construction documents. The alignment, location, design, and construction of each individual trail shall conform to the specifications, intent, character, and description for that specific trail as described in the construction documents. If conflicts arise in trail alignments, features, armoring, vegetation, landscaping, irrigation, and/or other items, trail contractor is required to immediately contact Owner's representative for resolution before proceeding. The trail contractor shall work with the Owner's representative to identify the need to further refine or adjust construction notes, location or types of trails or features, and make minor adjustments as soon as identified by the contractor. The trail flagging delineates the center of the approved trail corridor and desired trail alignment.

1.2 Technical Trail Features (TTF'S)

The feature location plans provide quantities and feature types but are diagrammatic and do not reflect an exact final alignment, location, or dimension for each feature. The trail contractor shall determine exact final location and dimension of all TTFS based upon final trail alignment, trail flow, character, difficulty, and surrounding terrain. It is the trail contractor's responsibility to ensure that final dimensions of TTFS (height, length, radius, width, etc.)

Flow appropriately with the speed of travel, other features and surrounding trails. TTF placements are required to include an optional line or bypass trail that provides users with an open and obvious route to avoid the TTF. Refer to details for typical detail. All manufactured TTF lengths are linear, not chord lengths. All manufactured TTF heights are from top of concrete footing or earth anchor to top of decking. All TTFS to be pre-engineered and designed. All manufactured TTFS will be sourced from insured bike park feature manufacturer and supplied by other. Feature manufacturer shall hold product liability insurance. TTFS are quantified separately in the bid form.

1.3 Turns

Turns on the trail system shall be cambered/banked/ bermed as necessary according to the specifications, drawings, intended riding experience, trail flow, trail speed, and difficulty. Turns shall be built according to the trail type and difficulty level as specified in the construction documents. Turns shall be constructed according to design and sustainability guidelines as set forth in building sweet single track. Turns shall be built with proper drainage and grade reversals before and after the turn. Construction of turns are included in the base trail cost and will not be quoted as separate units.

1.4 Vertical Undulations / Features

The trails should have vertical undulations such as rollers, jumps, grade reversals, and dips as necessary according to the specifications, drawings, intended riding experience, trail flow, trail speed, and difficulty. Construction of typical trail features that are approximately 24” or less in height are included in the base trail cost and will not be quoted as separate feature units unless specifically identified in the bid form (ex. Rollers, grade reversals, jumps <24”).

1.5 Trail Drainage

All finished tread must provide positive drainage off of the trail. The finished tread shall show no signs of erosion prior to final payment.

Drainage shall promote sheet flow off of the tread, rutting from shallow concentrated flow shall not occur on trail tread. Where necessary, trail contractor may construct shallow porous stormwater infiltration areas and swales adjacent to the trail to manage surface water drainage, provided they are constructed in an appropriate manner and do not create a hazard.

1.6 Grade Reversals (Rolling Grade Dip) / Drains

A designed grade reversal or constructed rolling grade dip shall occur at least every 100-150 feet along the trail alignment, preferably more frequently. All grade reversals must be strongly anchored to discourage short cutting. Grade reversals shall have cross slopes that promote positive drainage off trail and down slope of the tread. Cross slopes shall be twice that of the average tread cross slope (minimum 10%, maximum 20%). The grade reversal transition shall be gradual, and the feature shall cover a distance of at least 10 feet of trail. See details for additional information.

1.7 Trail Corralling

Trail contractor shall provide speed-reducing features and curves in the trail alignment to slow riders before reaching trail intersections.

Speed reducing features may include boulders, cut trees or in extreme cases fencing as obstacles. Contractor shall furnish and install landscape boulders on the trail system where necessary to help anchor the apex of turns, help define and improve intersections, prevent short-cutting, and to otherwise enhance the edge of the trail corridor where necessary. Landscape boulders shall be native rock partially buried into soil a minimum of 50% of the boulder's height below grade and per plan.

1.8 Rock Armor / Tech Trails

Rock armoring shall be installed where necessary to prevent trail erosion, harden wet tread, or provide tread texture. Rock armoring should utilize local rocks. When possible, rocks shall be harvested from the work site. Stone pitching, a form of rock armoring, shall be at least ten (10) inches deep with a minimum of seven (7) inches of the rock buried below the surface of the surrounding grade. Stones should be stable and aligned perpendicular to the direction of travel.

Each end of a pitched section shall be supported by larger “bookend” stones embedded in the ground to prevent movement of the rock armor. Surface depth variation and unavoidable obstacles shall adhere to IMBA trail difficulty rating system. Rocks shall not move.

Flagstone paving, a form of rock armoring, shall be two (2) inches to 24 inches thick and 12 inches to 48 inches wide. Voids larger than 2” shall be filled with compacted crushed stone and topped with compacted native soil, rocks shall not move. Rock armor shall be constructed such that the desirable path of travel is the tread and not the surrounding forest floor. Additional guide stones may be required if the final surface of the trail appears more rugged than the adjacent landscape. All rock embedded in the trail surface should be stable.

When used in structures, care will be taken to match rock to the immediate surroundings, grain patterns, lichen growth, etc. Excess tool marks on rocks are not acceptable. Contractor shall determine the appropriate ratio of “stone pitching” vs. “flagstone paving” for each individual trail segment.

1.9 Rock Placement at Drainage Crossings

Trail contractor shall construct a sub-base of crushed rock under the rock armor layer at drainage crossings. Possible locations include very low-lying terrain where water ponding is probable, significant water drainage crossings, or other areas expected to have very poor drainage. Rock placement must not obstruct flow above or below the drainage crossing. It should be placed in such a way that water runs through the intended channel. Refer to details. Locations for this improvement are to be flagged for the Owner's review and are outlined in the special considerations column of the trail schedule and quantified in the bid form, additional locations, while unlikely, may be determined by Owner's representative and shall be considered incidental to the unit rate for natural surface trails. If additional locations exceed 400 square feet, the contractor may submit a change order for added cost at the unit rate only after receiving written approval from the Owner's representative.

1.10 Rock Procurement

All rock armoring, rock gardens, and landscape boulders to be used in trail construction shall first be obtained from on-site stockpiles or designated areas to the extent possible. Given the lack of suitable native stone present on the site, the contractor should anticipate the need to source suitable stone elsewhere.

1.11 Boulders

Boulders used in rock armor, for TTFS or landscaping shall have a character and shape consistent with native landscape rock settings. If no native landscape rock is present, the contractor shall source boulders that are angular an irregular with properties that are positive for riding on and construction. Boulders shall be a range of sizes and shapes; minimum size is 2'W x 1.5'H x 2.5'L. To the greatest extent possible, rocks shall be placed in their final locations with the lichen or weathered side exposed.

1.12 Trail Surfacing Material

The intent of the trail surfacing material is to cover the existing soils as called for in the plan set (typically on jump lines and gravity trails) with a well-balanced surface that facilitates drainage, compacts well, and that performs reasonably in both wet and dry weather conditions.

Trail surfacing material shall be incidental to the unit rate for trail construction. All imported soil will require lab testing to meet the following requirements:

a ) Surface material shall be composed of between 65-75% clay and 35-25% sand.

b ) Material shall be natural, uncontaminated, and free of organic material, vegetation, waste, recycled concrete, asphalt, noxious weeds/seeds, and other deleterious matter.

c ) Material comprised wholly of rock aggregate, gravel, road base, crusher fines or similar is not acceptable due to unfavorable looseness, surface marbles, lack of binding, and other negative characteristics for bike riding.

d ) The trail surface material must be tested in both wet and dry conditions on the sample trail sections described in the performance specifications.

Modifications to the material may be necessary based on the sample test.

Owner's representative must approve the material before additional construction may proceed. Trail surfacing material is not incidental to the unit price for natural surface trails and is quantified and identified as a separate bid item on the bid form.

1.13 Compaction

All trail sub grades, trail treads, trail surfacing materials, backslopes, rollers, berms, fill, and terrain enhancements shall be compacted to a minimum 92% proctor and in a manner that will support the intended use.

1.14 Quantities

For all specifications that contain more or less quantities, it shall be understood and agreed that quantities listed in the specifications are estimated only and may be increased or decreased in accordance with the requirements of the Owner.

1.15 Fill Material

Fill needed for trail construction, berms, rollers, or other features may be generated during trail excavation, borrowed from surrounding landscape where appropriate, borrowed from onsite stockpiles, or imported if necessary. Fill material shall be uncontaminated and free of organic material, trash, noxious weeds/seeds, and other objects.

Fill material shall be placed, graded, and compacted by trail contractor in a manner that will support the intended use. The non-riding surfaces of berms, rollers, landscape mounds, or other terrain enhancements created by the trail contractor shall not exceed a 1:1 slope.

1.16 Backslope

Due to the erosive nature of the loess soils, the backslope of trail should be graded to a slope that limits the amount of site disturbance and does not exceed a 1:1.5 slope or until it matches the existing ground. The edge between existing ground surface and backslope shall be smooth and not impede the flow of water or provide vertical drop between the existing ground surface and backslope. Any backslope that is created by fill shall be compacted to 90% proctor.

Refer to erosion control plans for additional requirements pertaining to backslopes.

1.17 Trail Finished Condition

Finish and grading of backslope, down slope spoils, and drainage features shall leave surface that matches the texture of the surrounding forest floor. Finished tread should be compacted to 92% proctor and provide positive drainage off trail. Finished tread shall incorporate fixed natural and native roots and rocks according to specifications and dependent on trail type. Runoff shall be diverted during sheet flow prior to shallow concentrated flow. Cross slopes may vary (5% minimum, 10% maximum), including cambering of turns, but water must exit the trail in sheet flow without causing erosion of or puddling on, the trail. Locations intended to drain water from the trail shall have a minimum slope of 10%, unless authorized by the Owner's representative.

1.18 Spoils Stabilization

All excavated materials not used in the trail tread or other trail structures must be stabilized. Spoils shall not be placed in drainages, swales, ephemeral streams, wetlands, or any area known to convey water during wet weather events. When possible, spoils should be mulched with native materials to discourage erosion while native seed stocks reestablish. In areas without adequate native mulch, seed-free straw and suitable native seed may substitute. In certain circumstances, installation of formal erosion control measures may be required. It is the contractor's responsibility to conform with all local, state, and federal stormwater regulations.

1.19 Corridor Clearing

The finished trail corridor shall extend horizontally a minimum of 3.0 feet from the edge of the trail tread to both sides and shall be a minimum vertically eight (8) feet high and higher in the case of jump and flow trail types as determined to be necessary by the owner's representative. Corridor clearing shall be confined to within five (6) feet of trail alignment centerline. The natural surface trails project contractor shall be responsible for all costs associated with grubbing of stumps within the trail tread and flush cutting of stumps within trail corridor, these costs will be incidental to the unit rate for natural surface trails.

1.20 Spoils

The trail tread shall consist of mechanically compacted earth or rock.

No organic material may be within trail tread. Tread shall be mineral soil or rock. All stumps shall be excavated and removed from the trail tread. Any stumps resulting from corridor clearing should be excavated and removed. Stumps not removed in the corridor may not pose an unreasonable risk. Spoils shall be stabilized as outlined in “stabilization”. Any down slope spoils must be distributed to encourage drainage off the trail. Spoils may be distributed up slope on hillsides with a slope angle less than 30%. Spoils and disturbed areas outside of the trail tread must be stabilized with a covering of forest mulch or leaves. In areas with insufficient duff, weed-free straw may be substituted for forest materials. Excess soil shall not be distributed into drainages or adjacent to streams. Any woody debris not used in trail closure should be removed from sight of the trail or arranged to blend into the landscape.

1.21 Debris and Woody Material

Any woody debris not used in trail closure should be removed from sight of the trail or arranged to blend into the landscape. Cut and scatter all branches and brush to maximum height of 18 inches above the existing ground surface. No debris shall be left within 10 feet of trail, unless placed as anchors or stabilization. Butt-ends of any sawed limbs shall be placed facing away from trail. All branches trimmed shall be cut to a main branch or trunk to prevent stabs or “coat hangers”. Woody material such as stumps, logs, and brush shall be removed from the trail tread. Stumps less than 12” diameter at breast height (DBH) within three (3) feet of the trail tread will be removed or flush cut to existing ground surface.

1.22 Test Riding

Trail contractor shall thoroughly test ride all trails and trail features, by bike with appropriately skilled rider, to ensure the specified riding experience, design, flow, rhythm, character, difficulty, and specifications are met. Testing shall be performed during the trail alignment and trail feature location process, as well as during construction and following construction, to the extent possible and in consultation with owner's representative. Trails and features shall be modified and corrected as necessary until performance specifications are met.

1.23 Sample Trail Section

Contractor shall construct sample segments of a minimum of 50 linear feet of each trail type and 20 square feet of each armoring type as indicated in the construction plans. These sections shall contain a complete sample of the construction methods, materials, and workmanship intended for the project. The owner's representative must accept work before additional construction May proceed. Corrections shall be executed as necessary for acceptance. The accepted samples shall be retained during

Construction as a standard of work. Accepted samples shall be part of the actual trail system. Upon completion of sample, 2,500' lengths of individual trail may be constructed at a time. Owner's representative to approve 2,500' section prior to commencement of next section.

1.24 Bridges

Any required bridges shall adhere to local codes and regulations.

Design and determining exact location(s) shall be the responsibility of the selected contractor. Shop drawing shall be provided and must be approved by owner's representative. Bridges are not incidental to the unit price for natural surface trails and are quantified and identified as a separate bid item on the bid form.

1.25 Contractor Coordination

Trail contractor shall be responsible for any coordination with general contractor and subcontractors as required to complete all operations.

1.26 Missing Specification

Any specifications not addressed in these notes are to be covered by the Iowa Urban standard specifications for Public Improvements (SUDAS) 2023 Edition

Method of Measurement Natural surface trails shall be measured by the linear foot quantity, complete in the field, as listed in the proposal page without measurement thereof.

Basis of Payment Natural surface trails shall be measured as described above and shall be paid for at the contract unit price which shall be full compensation for all work, materials, tools, equipment, labor, hauling, placement, disposal, and incidentals required to complete the work as set forth in the description. Natural surface trails special provision shall cover all-natural surface trail bid items regardless of naming (adaptive trad trail, trad trail, gravity trail, MBO trail, hiking trail, etc.)

CONSTRUCTION SEQUENCE

The following construction sequence is to be used as a general guideline.

The contractor to coordinate with the Owner and submit a proposed construction sequence for review and approval prior to construction.

Stormwater and Site Preparation

1. Conduct a pre-construction meeting.

2. Check for existing utilities prior to any excavation, (Call 811)

3. lnstall temporary erosion and sediment controls.

Trails and Jump Zone Construction

4. Contractor must submit a surfacing mixture sample (1 gallon) to the engineer prior to delivery to the site.

5. lnstall necessary drainage infrastructure and rough grade dirt jump zone.

6. Fine grade dirt jumps and run ins. Install prefab wood kickers, wall rides.

Site visit and test ride required for sign off.

7. Flag locations of all skill trails features, site visit required for sign off before installation.

8. Install skills trails and bike playground features. Site visit and test ride required for sign off.

9. Grade all trail tread. Site visit and test ride required for sign off.

10. Remove remaining erosion and sediment controls only after surrounding disturbed areas have been properly stabilized.

11. Notes:

(1.) Field flagging (by Contractor) and review are required before any construction can begin on any bike park features or Skills trails. Sign off by Owner or Owner's Representative is required before construction commences.

(2.)See general notes/specifications/construction details for detailed construction requirements.

ACCESS & TRAFFIC CONTROL NOTES:

1. Contractor to submit site access plan to engineer and owner for review and approval min. 2 weeks prior to start of construction.

2. No easements or right-of-entry has been obtained by the city.

Contractor shall be responsible for obtaining right-of-entry, if required, for access to site through private property. If contractor obtains right-of-entry, agreements must be provided to city for record prior to contractor entering private property.

3. Contractor shall be responsible for all necessary traffic control required to complete the project based on their proposed site access. Traffic control plan shall be submitted to engineer and owner for review and approval min.

2 weeks prior to start of construction.

4. All closures of existing trail system shall be by orange safety fence and type ill barricade across trail closed trail segments shall have trail closed ahead signage mounted on type ii barricades at nearest trail intersections, both sides of closure, to forewarn users.

5. At minimum, one open lane of traffic in each direction shall be maintained along singing hills boulevard at all times. Singing hills boulevard shall be opened to two lanes of traffic in each direction and all traffic control removed during non-working hours.

6. Contractor to furnish and install sudas figure 8030.102 "work off of pavement with minor encroachment onto traveled way" while completing work within singing hills boulevard right of way.

7. Contractor to coordinate staging areas with city.

8. Contractor shall be responsible for restoration of all staging and site access areas

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40.80'

39.93'

PARCEL #060/09478-001-000

SW1/4 NE1/4

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- NO TREES ARE TO BE

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GENERAL NOTE

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PROJECT AREA

2,177,527 SF (49.9 AC)

FLOOD PLAIN LIMIT LINE

(100 YEAR EVENT)

E nd S

T (A

D O

E nd

WATER CROSSING

SEE FOUR MILE PARK

TRAILHEAD PLANS FOR MORE

INFORMATION. BY OTHERS.

EXISTING GRAVEL

ENTRANCE

' S

EXISTING STOCKPILE.

CONTRACTOR TO REGRADE &

COMPACT EARTH TO CONFORM TO

PROPOSED GRAVITY SOFT TRAILS

AND TECHNICAL FEATURES

12.0' min.

DOWN SLOPE

TRAIL

OPEN RAMP

FEATURE

UP SLOPE

TRAIL

ELEV.

+/- 828.00

ELEV.

+/- 827.00

SOFT TRAIL

DIRECTIONAL

UP SLOPE TRAIL

RESTROOM AREA

(N.I.C.)

C302

A C202

3814816

845 850

830 835201

204104

Future Skills Course

105Fu tu re S kil ls

Tr ail 105

+83…

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