HomeMy WebLinkAbout1.0 ApplicationOctober 16, 2019
APPLICATION FOR A DEVELOPMENT PERMIT
FOR CONSTRUCTION ACTIVITIES PROPOSED WITHIN THE
FLOOD FRINGE ASSOCIATED WITH PLACEMENT OF A
MANUFACTURED OFFICE BUILDING ON A PARCEL AT,
25028 HWY 6 & 24 RIFLE COLORADO
BEING WITHIN THE 100 -YEAR FLOODPLAIN -FLOOD FRINGE
Representatives:
Application Report:
Sopris Engineering LLC
502 Main Street, Suite A3
Carbondale, Colorado. 81623
970.704.0311
Paul Rutledge
Design Engineer
Mark S. Beckler PLS
Project Manager
Applicant:
William T. Lee (DBA Central Aggregates, Inc.)
PO Box 1877,
Rifle, Colorado. 81650
970.625.3598
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
Page 2
APPLICATION FOR A DEVELOPMENT PERMIT
TABLE OF CONTENTS
1. Application Narrative
Appendices
A. Application Form and Payment Agreement Form (Pending)
B. Letter of Authorization for Sopris Engineering LLC
C. Warranty Deed confirming Applicant's Ownership
D. Applicant's Title Policy identifying Mineral Rights (Pending)
E. List of Property Owners within 200 feet of parcel
F. Vicinity Map - three mile radius of subject property
G. Site Plan showing Existing and Proposed Improvements
H. Holding Tank Septic Design
I. Stamped Tie Down Anchor System documentation
J. Floodplain Exhibits
K. Elevation Survey (dated 3/15/2019) — Bookcliff Survey Services, Inc.
L. FEMA Elevation Certificate for Construction (Office Building)
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
Page 3
APPLICATION FOR A DEVELOPMENT PERMIT
FOR PLACEMENT OF A MANUFACTURED OFFICE BUILDING
ON A PARCEL OF LAND LOCATED IN THE FLOOD FRINGE
WITHIN THE 100 -YEAR FLOODPLAIN
Property Owner
Property Location:
William T. Lee (DBA Central Aggregates, Inc.)
PO Box 1877, Rifle,
Colorado. 81650
970.625.3598
The subject property is a metes and bounds described parcel located in
Section 17, Township 6 South, Range 93 West of the 6th P.M. in Garfield
County. Garfield County parcel No. 217717100044. (Subject Parcel)
Request for Approval: (a) A Development Permit for proposed construction within a portion of
the Subject Parcel that is located within the delineated flood fringe (Zone
AE).
(b) Approval of construction in accordance with Garfield County's
Regulations regarding Development Permits and work in a flood plain.
SUMMARY OF REQUESTS
The applicant is requesting a Development Permit in order to position a new manufactured
building to function as an administrative office. The office will be staffed by five persons during
the typical hours of operation of 7:00 am and 5:00 pm Monday to Friday with occasional
occupation outside of normal business hours. The applicant requests the County's approval to
perform the necessary improvements within the delineated flood fringe on the Subject Parcel.
The work in the floodplain will involve permanent placement of a single story 1,440 ft2
manufactured office building (Office) and construction of; an Onsite Wastewater Treatment
System (OWTS), utility services, employee/customer parking area (eight vehicles) and
associated minor drainage re -grading within the proposed development envelope. All work in the
floodplain will be performed within the limits of the established FEMA Zone AE flood fringe
and above the existing river channel top of bank, at an existing grade higher than the established
Base Flood Elevation (BFE). No work is proposed within the established FEMA floodway. The
finish floor grade of the proposed Office will be more than one foot, as required, above the 100 -
year BFE of 5283.5'. The structure will be raised above existing grade on an engineered support
and anchoring system typical for manufactured building construction. The proposed construction
does not involve the placement of any structures or materials that will adversely affect the
existing flood hydrology or impact any sensitive area. Utility trenches will be restored to original
grade and compacted. No construction or other work activities will be performed in the floodway
therefore the existing floodway will be maintained with 0 -rise of flood levels and velocities. All
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
Page 4
disturbed area on the site and within the flood fringe area will be stabilized and returned to
existing conditions. Best management erosion control practices shall be in place and maintained
as needed.
EXISTING CONDITIONS AND FLOODPLAIN
The Subject Parcel is a 33.99 acre active gravel pit designated within Rural Zoning as
Manufacturing/Processing Land per Garfield County Assessor. The 6,000 ft2 proposed
development envelope (Site) is within a re-claimed portion of the Subject Parcel outside of
County setbacks. The Site's topography is flat, void of vegetation and unencumbered by ditches
or wetlands. City of Rifle water and electricity are currently supplied to buildings adjacent to the
proposed Office site.
The site elevations and the FEMA FIRM mapping elevations on the attached site plan and the
attached construction flood certificate are referenced to the NGVD 29 vertical datum in
relationship to the current published FIRM map and FEMA statute. For consistency all
elevations shown in this report are adjusted to NGVD 29 using a vertical adjustment of -3.917
feet from NAVD 88 elevations per National Geodetic Survey VERTCON data for the specific
site. As required by Section 4-203-0 — 1. Floodplain Specific Site Plan elevations are shown in
NAVD 88 as well as NGVD 29 vertical Datum.
The proposed development within the flood fringe will occur to the North and outside of the
floodway as defined by the established FEMA Floodplain line through the subject property.
The 100 -year BFE at the most upstream point of the proposed Office is at an elevation of 5283.5'
(extrapolated from published FIRM BFE data). The proposed single story office building's finish
floor elevation is designed to be 36 inches above the existing grade of 5286.7' (resulting in a
design finished floor elevation of 5289.7').
The floodplain information has been derived from the FEMA FIRM map, Community -Panel
Number; 080205 1353 B, Index Date 12/15/1977 Revised 1/3/1986.
The Regulations with respect to the floodplain require a Floodplain Development Permit for
improvements and uses within the floodplain in accordance with Section 4-109 of the Land Use
and Development Code. The Applicant's proposed construction and uses are inside of the flood
fringe (Zone AE). The construction activities will be completed with appropriate flood proof
construction including the stabilization of any placed fill as applicable by definition under the
Floodplain Regulations Section 3-301.
OVERLAY DISTRICT REGULATIONS
Section 3-301, FLOODPLAIN OVERLAY REGULATIONS.
All proposed improvements and uses described, in the summary of requests above, are permitted
in accordance with Table 3-301 Floodplain Overlay Use Restrictions Table. These specifically
include construction of permanent structures, sewage treatment facilities, underground utility
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
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services, parking areas, driveways, storage yards, etc. easily moved and not subject to flood
damage, that do not require asphalt paving.
In accordance with Section 3-301 General Standards (B5) and Specific Standards (C4 a -b) the
proposed structure will be installed using methods and practices which minimize flood damage
and meet or exceed State and local anchoring requirements for resisting Zone 1 wind forces. The
Office will be anchored on a permanent chassis, placed upon engineer approved piers 36 inches
above ground level, utilizing engineered tie downs, earth augers and practices as depicted in the
Professional Engineer stamped "Engineered Tie Down System Design and General Notes" The
specified Minute Man MMA -650 (50 inch) earth auger anchor tie down system is engineered for
FEMA Flood Hazard Zones A, AE & AH. Office access will be via engineered metal stairs and
ADA approved ramp both equipped with code compliant railing systems.
It is understood the constructed foundation system must be inspected by the County's Building
Official prior to delivery of the structure and all aspects of building installation will be in
accordance with the Housing and Urban Development (HUD) Part 3285—Model Manufactured
Home Installation Standards (current as of September 23, 2019) and County Building
Codes.
The proposed Office building shall meet or exceed all required manufactured home certification
requirements pursuant to the "National Manufactured Housing Construction and Safety
Standards Act of 1974". Additionally, the building design will be in compliance with all Federal
and State standards including but not limited to; construction, safety, wind zone, heating and
insulation.
Minor site re -grading will be performed to ensure positive drainage directing surface water away
from the structure, protecting against erosion of foundation supports and to prevent water build-
up under the building. A minimum of one-half inch per foot fall from the foundation for the first
ten feet will be applied per HUD's Part 3285—Model Manufactured Home Installation
Standards
The proposed Office will connect to the available City of Rifle water and electric service, under
the existing service agreements, and constructed according to code and regulation.
The proposed new OWTS holding tank will be anchored and sealed to resist infiltration and
buoyancy forces.
To insure no infiltration of ground or surface waters into the OWTS, the holding tank will be
installed in accordance with manufacturers' recommendations utilizing a watertight concrete
tank with watertight ribbed PVC risers and sealed lids, covered with traffic rated access risers,
iron rings and covers. The tank will be anchored to provide buoyancy compensation during time
of elevated ground water. The OWTS design calls for installation of a liquid level alarm to light
and sound at 75% tank capacity. All pipes shall consist of specified materials and tested to be
waterproof so that no water infiltrates the system. All sewer pipe material should be gasketed
SRD-26 pipe.
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
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The level topography and open nature of the proposed site and surroundings does not require
engineering or earthwork for driveway improvements to the Site or the Subject Parcel's existing
access. The proposed construction and minor re -grading within the flood fringe will not be
affected by floodwaters or cause adverse changes in flood patterns downstream since the existing
grades are higher than the BFE. No geo hazards or wetlands have been identified on the
developed site. No hydrologic condition has been identified that requires USACE determination
or permitting.
SUMMARY
The applicable maps identify that the improvements are within the 100 -year delineated flood
fringe. The construction in the established flood fringe (Zone AE) activities are limited to a
single story 1,440 ft2 manufactured office building, an OWTS holding tank, utility services,
parking area and minor grading within the proposed development envelope. The proposed
construction includes an engineered tie down and pier system, placement of the structure typical
for manufactured home construction and minor re -grading associated to assure positive drainage
within the flood fringe only. Utility trenches will be restored to original grade and compacted.
All utility service improvements will be installed in sealed conduits underground. The finished
construction will be designed and constructed with materials that are resistant to flood damage.
No construction activities are proposed that will restrict or otherwise adversely impact the
current flood flow conditions. No storage or disposal of any hazardous materials is proposed
within the floodplain.
Section 4-109 - DEVELOPMENT IN THE 100 -YEAR FLOODPLAIN
This section of the Land Use and Development Code permits construction as discussed herein.
Because the proposed improvements are impacted by the 100 -year flood plain, Applicants
acknowledge and herein address the applicable review criteria associated with Sub -sections A, B
and C and Table 4-102 considering Development In The 100 -Year Floodplain to be granted by
Decision.
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
Page 7
Section 4-109(C) REVIEW CRITERIA
With consideration of the Elevation Certificate and Bookcliff Survey (documents attached) the
existing grades at the proposed site are in excess of three feet above the effective BFEs.
Therefore it is our conclusion that no risk will result from the proposed development. More
specifically, the relevant factors of sub section C are addressed here.
1. Proposed improvements lie within an open area with no possibility of endangerment to
life or property. Ample area allows for the flow of potential floodwaters. The site is flat
and erosion risk is low.
2. The proposed Office structure shall be placed on an engineered tie down system at an
elevation well in excess of one foot above the BFE. The associated grading will be
constructed to deflect any potential stormwater to its natural path and protect the
anchoring system.
3. The remaining portion of the Subject Parcel and the adjacent land to the west, down
gradient of the proposed development envelope, are both part of an active gravel pit, that
includes a pond situated within the 100 year floodplain fringe. This pond potentially may
serve to attenuate large storm flow runoff. Contents of the Office shall be contained
within the structure. No materials or unanchored elements are included in the proposed
design.
4. All proposed improvements are compatible with Floodplain Overlay Regulations 3-301.
The proposed 1,440 ft2 Office structure will be situated within the 33.99 acre active
gravel pit open for business during similar hours.
5. The current emergency vehicle access to the Subject Property and the proposed Office is
maintained via US Highways 6 & 24 along the north border of the property and a granted
crossing permit across the D.R.G.W. Railroad. The parcel is flat and open allowing for
ample turn -around area to accommodate large emergency vehicles.
6. Proposed improvements require underground connection to existing utility services. All
utility service improvements will be installed in sealed conduits underground and
backfilled with Aggregate Base Course compacted to 95% relative compaction to insure
resistance to potential storm or flood disturbance.
7. The stream reach within the vicinity of the Site lies within a broad floodplain. The
proximate area has no development other than the gravel pit and is dominated by vacant
lands vegetated with trees, shrubs and open grass areas. The adjacent area to the south of
proposed development envelope, within the right bank flood fringe, is vegetated with
minimal sloped terrain with established drainage paths that will serve to drain and
attenuate excess storm or flood waters. The entire Subject Parcel consists of pervious
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
Page 8
gravel and all existing and proposed grades on the site are above the BI -'E profile. The
onsite soils are alluvial with high capacity for infiltration of surface water. Therefore no
active stormwater management infrastructure is required
Based on the site conditions summarized above, the height and velocities of potential
backwater flood flows is minimal and is not expected to increase as a result of the
proposed improvements. With respect to the existing vegetation, shallow topography
above the BFE we do not expect any concern with wave action or erosion from receding
flood backwater. Due to the large and relatively flat flood fringe area relative to the
floodway the rate of rise and potential for sediment transport is expected to be low and
insignificant in terms of the overall width of the flood zones. Therefore we do not believe
that the items in Section 4-109, C-7 are applicable to this project.
8. No waterfront facility is applicable to the proposed improvements.
9. The delineated locations of the proposed site improvements have been determined to be
appropriate based on the existing conditions with respect to survey topography. The
layout and proposed grading maintains drainage flow paths with respect to the floodplain
and will not affect conveyance of storm and flood waters.
10. All proposed Office building construction and uses are consistent with use in the flood
fringe as specified in the Garfield County Land Use and Development Code.
Section 4-201 APPLICATION MATERIALS
The construction within the floodplain on the proposed Site will be designed and constructed in
compliance with the applicable provisions of Table 4-201, Application Submittal Requirements.
General application materials are included with this report. A Vicinity Map with three mile
radius from the Subject property, an existing and proposed conditions Site Plan overview and
Detail, a FEMA FIRM overlay are attached following this report and identified in the
Application's Table of Contents.
Section 4-203 — DESCRIPTION OF SUBMITTAL REQUIREMENTS
This report and the Exhibit mapping sheets were prepared by Sopris Engineering based on our
review of the relevant flood conditions and the documents provided by other consultants as listed
here.
Subject Property Elevation Survey (dated 3/15/2019) — Bookcliff Survey Services, Inc.;
Stamped Tie Down Anchor System. Design & General Notes - Minuteman Anchors Inc.
All supporting documents pursuant to the applicable Section 4 -203 -Sub -sections are addressed
within this report and or included as Appendices hereafter. Any additional requirements of
Section 4-203 Sub -sections deemed applicable will be submitted as needed for the site specific
conditions prior to building permit application.
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
Page 9
Section 4-203-E GRADING AND DRAINAGE PLAN
The following narrative further describes activities that will be implemented on site associated
with stabilization and best management practices. Detailed plans addressing all applicable code
requirements will be prepared and submitted for building permit application.
Topographic mapping indicates that the Site will not receive storm water from up -gradient
offsite sources due to existing flow paths, neighboring topography and established vegetation.
During construction, any runoff will be controlled and attenuated on the site by direct infiltration
into the ground and temporary retention in surface depressions. Potential erosion and
sedimentation from disturbed areas will be controlled by installation of strategically placed silt
fencing and wattles (erosion logs) where necessary. These measures in conjunction with material
storage and management will ensure little to no potential risk during a storm or flood event.
Recovery of disturbed areas will be completed after construction activity.
The following material storage and management practices are to be implemented at the Site:
• Adequate garbage, construction waste, and sanitary waste handling, and disposal
facilities are provided to keep the Site clear of potential pollutants and pollutant sources..
• Materials and wastes no longer required for the construction will be removed from the
Site and properly disposed.
• Potential pollutants and pollutant sources are handled in such a way as to minimize
contamination risk.
• Chemicals and petroleum products stored on-site and outside will be covered, placed in
secondary containment, secured chemical storage lockers, and protected from accidental release
on designated areas above and outside of the flood fringe zone area.
Section 4-203-N —1. b, i & j WASTEWATER MANAGEMENT AND SYSTEM PLAN
An Onsite Wastewater Treatment System (OWTS) is proposed for the proposed Office, and is
being designed by Sopris Engineering.
The proposed OWTS will consist of a 2,000 gallon concrete septic tank with sealed risers and
lids and equipped with a 75% capacity liquid level alarm. The system will be a closed non -
discharging system that will serve as a holding tank that will be periodically pumped as needed.
Therefore the system does not include an absorption field or require a soils test.
Section 4-203-0 — 1. FLOODPLAIN ANALYSIS
All the listed items in Sub -section (1) a -i are addressed in this report, the FIRM Overlay exhibit
maps and the Elevation Certificate for Construction.
In summary, the elevations shown here are based on NGVD 29 vertical datum unless stated
otherwise. The 100 -year BFE at the most upstream point associated with the structure within the
flood fringe is at an approximate elevation of 5283.5'.
Applicant: Central Aggregates Inc.
SE Job No. 19038.02
October 16, 2019
Page 10
The upstream point BFE was extrapolated from the BIi'Es published in FEMA FIRM Panel
0802051353 B Index Date 12/15/1977 Revised Date 01/03/1986. Vertical datum NGVD 29.
Existing grade at the Site is 5286.7, per Bookcliff 2019 survey (5290.6' NAVD 88*).
The proposed Office building is designed to be raised 36 inches above existing grade with a
design finish floor elevation of 5289.7' 6.2' above the BFE and greater than the minimum
required one foot above the BFE.
*NAVD 88 elevations were adjusted to NGVD 29 using a conversion of -3.917 per NGS
VERTCON.
APPENDICES
The following documents are appended hereto:
A. Application Form and Payment Agreement Form (Pending)
B. Letter of Authorization for Sopris Engineering LLC
C. Warranty Deed confirming Applicant's Ownership
D. Applicant's Title Policy identifying Mineral Rights (Pending)
E. List of Property Owners within 200 feet of parcel
F. Vicinity Map - three mile radius of subject property
G. Site Plan showing Existing and Proposed Improvements
H. Holding Tank Septic Design
I. Stamped Tie Down Anchor System documentation
J. Floodplain Exhibits
K. Elevation Survey (dated 3/15/2019) — Bookcliff Survey Services, Inc.
L. FEMA Elevation Certificate for Construction (Office Building)
Garfield County
Community Development Department
108 8t" Street, Suite 401
Glenwood Springs, CO 81601
(970) 945-8212
www.garfield-county.com
LAND USE CHANGE PERMIT
APPLICATION FORM
TYPE OF APPLICATION
Owner/Applicant
Name: C NT(Z fL Oa -6 e-rgiET Phone: ( /70 62S- 3 S` e
Administrative Review
" Development in 100 -Year Floodplain
E-mail: ri Cr lecreek5 ►1eQ 5Mgi 1. eaM
Limited Impact Review
0 Development in 100 -Year Floodplain Variance
Mailing Address: Sn Z t1fh4/ sr
Major Impact Review
Q Code Text Amendment
Amendments to an Approved LUCP
0 Rezoning
QZone District PUD ❑PUD Amendment
LIR EMIR SUP
Physical/Street Address: 25—"2E3 14/W 7 4 24 Qit t f Co
Minor Temporary Housing Facility
Administrative Interpretation
Zone District: Property Size (acres): 3311 kr-
Vacation of a County Road/Public ROW
Appeal of Administrative Interpretation
Location and Extent Review
Areas and Activities of State Interest
Comprehensive Plan Amendment'
DAccommodation Pursuant to Fair Housing Act
Pipeline Development
Variance
Time Extension (also check type of original application)
INVOLVED PARTIES
Owner/Applicant
Name: C NT(Z fL Oa -6 e-rgiET Phone: ( /70 62S- 3 S` e
Mailing Address: Po 6X I g 7 7
City: %ZIfLF State: Zip Code: 8(6Sn
E-mail: ri Cr lecreek5 ►1eQ 5Mgi 1. eaM
Representative (Authorization Required)
Name: S. Arcata_ C Phone: ( q70) 70* eigll
Mailing Address: Sn Z t1fh4/ sr
City: et4e 40Al Atz.4 State: Zip Code: e/b o7
nl beckier € Sd rii(e n M
E-mail: � ,S' C7
PROJECT NAME AND LOCATION
Project Name:
Assessor's Parcel Number: 2/ 7 7 - 17 I- O O- O 44 4
Physical/Street Address: 25—"2E3 14/W 7 4 24 Qit t f Co
Legal Description: Mei 14 60.4a1=4 DCSe/W/10d (/Tv4 mi
SeLr7nd/ /7 76 S - izi3 a a< 6 7' P M .
Zone District: Property Size (acres): 3311 kr-