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Home My WebLink About16.0 Grading and Drainage ReportEXHIBIT 15 Grading and Drainage Report Steiner Minor Subdivision BUI#17022.02 Minor Subdivision Application December 19, 2019 Grading & Drainage Plan Civil Engineering Surveying & Weyond • ,s6Wa rlee nlimi The Drainage Plan is provided in accordance with Article IV Section 4-203.E of the Garfield County Unified Land Use and Development Code and follows the outline provided therein. El. Site Map: The purpose of this document is to provide a basic engineered analysis for grading and drainage on the proposed Steiner Minor Subdivision in Garfield County, Colorado. The 25.67 Ac. property is owned by Orchard Creek Ranch, LLC and was previously developed with an ADU/barn/small apple orchard and a single-family residence. The ADU/barn/orchard area also contains other minor agricultural buildings. The intent of the subdivision is to separate the two existing uses onto individual parcels of land. As an individual parcel, the ADU/barn/orchard lot (Lot A:1) would also allow for a future single-family residence to be constructed. Canyon Creek flows along the eastern boundary of the property. The property does not contain any other waterbodies, hydrologic features, intermittent water features or wetlands that might be adversely impacted by proposed subdivision of land. According to the Garfield County FEMA Floodplain Mapping database, the Canyon Creek Floodplain is represented under Preliminary Map #08045C1130E and is well below the existing structures (attached). Please see Sheet C.1 for the existing improvements and proposed lot configuration. E2. Drainage Structures: The only existing drainage structures on the property are roadside ditches, culverts under driveways and minor drainage swales constructed to direct runoff around the buildings. The property is rural and does not contain any stormwater detention facilities. Since the property is already developed, no additional stormwater facilities are necessary for the proposed division of land. The location of a future residence on the ADU/barn/orchard lot (Lot A:1) is unknown at this time. Therefore, the need for stormwater mitigation of that residence will need to be addressed at the time of building permit application. E3. Topography: In general, The site slopes from west to east at 9%-14%. 1-foot contours are represented on Sheet C.1. E4. Grading Plan: As discussed, the property is already developed and no additional improvements are proposed at this time. Please see Sheet C.1 for the existing grading. E5. Soil Stockpile and Snow Storage Area: As discussed, the property is already developed and no additional subdivision improvements are proposed with this division of land which would require soil stockpiles. The location of a future residence on the ADU/barn/orchard lot (Lot A:1) is unknown at this time. Therefore, the need for soils stockpiles for that residence will need to be addressed at the time of building permit application. Snow storage currently exists along the edges of the driveways and is anticipated to be the same for the future residence. Page 1 923 Cooper Avenue, Ste. 201 I Glenwood Springs, CO 81601 I 970.945.5252 I www.bu-inc.com E6. Drainage Plan: As discussed, the property is already developed and no additional subdivision improvements are proposed with this division of land. The location of a future residence on the ADU/barn/orchard lot (Lot A:1) is unknown at this time. Therefore, the need for drainage improvements for that residence will need to be addressed at the time of building permit application. E7. Equipment Storage: As discussed, the property is already developed and no additional subdivision improvements are proposed with this division of land. The barn, associated agricultural buildings and parking areas are currently used to store agricultural equipment and materials. The location of a future residence on the ADU/barn/orchard lot (Lot A:1) is unknown at this time. Therefore, the need for equipment and material storage for that residence will need to be addressed at the time of building permit application. E8. Temporary Roads: No temporary roads are proposed with this application. E9. Areas of Steep Slope: Steep slopes exist along the banks of Canyon Creek and below Canyon Creek Road (CR #137), but no additional development is proposed in those areas. E10. Construction Schedule: This application does not require the construction of any additional infrastructure until the future residence is located on the ADU/barn/orchard lot (Lot A:1). Therefore, the construction schedule for that residence will need to be addressed at the time of building permit application. Ell. Permanent Stabilization: Since there is no additional infrastructure proposed with this division of land, no additional permanent stabilization is necessary. E12. Erosion Control Measures: Since there is no additional infrastructure proposed with this division of land, no additional erosion control measures are necessary. E13. Estimated Cost: As discussed, the property is already developed and no additional subdivision improvements are proposed with this division of land. Therefore, no cost estimates are necessary. E14. Calculations: As discussed, the property is already developed and no additional subdivision improvements are proposed with this division of land. Thus, no stormwater calculations or analyses are necessary at this time. The location of a future residence on the ADU/barn/orchard lot (Lot A:1) is unknown. Therefore, the need for stormwater calculations or analyses for that residence will need to be addressed at the time of building permit application. Historically, stormwater runoff from the site sheet and shallow flowed from west to east into Canyon Creek. This pattern will not be changed by the proposed division of land. Existing site vegetation consists of pasture fields, the orchard, lawn grasses, ornamental trees/shrubs and native trees/shrubs. Impervious areas include roofs, patios and drives/parking. Adjacent properties similar rural properties with single-family residences. Page 2 923 Cooper Avenue, Ste. 201 I Glenwood Springs, CO 81601 I 970.945.5252 I www.bu-inc.com E15. Neighboring Areas: The site is neighbored by rural single-family residences east and west, a historic school house to the north and Highway 6 to the south. E16. Stormwater Management: Under the existing condition, runoff sheet/shallow flows across the site from west to east and then discharges onto Canyon Creek. This will not be changed by the proposed division of land. The location of a future residence on the ADU/barn/orchard lot (Lot A:1) is unknown. Therefore, the need for stormwater management for that residence will need to be addressed at the time of building permit application E17. Stormwater Management Plan: The proposed division of land does not require an application with the CDPHE. E18. Reclamation, Revegetation and Soil Plan: As discussed, the property is already developed and no additional subdivision improvements are proposed with this division of land. Therefore, no reclamation, revegetation or soil plan is necessary. E19. Hydraulic Calculation: The proposed division of land does not contain any new channels or pipelines which would require hydraulic calculations. E20. Maintenance Requirements: As discussed, the property is already developed and no additional subdivision improvements are proposed with this division of land. Therefore, maintenance requirements are required beyond what is typical for a rural residential property. E21. Spill Prevention Control and Countermeasures Plan: Fuel and/or hazardous liquid storage are not proposed on the site. E22. Additional Information or Detail: None. E22. Signatures: Prepared by: Deric J. Walter, PE Boundaries Unlimited Inc. Acknowledged by: Orchard Creek Ranch, LLC Owner/Applicant Attachments • FEMA Floodplain Map Page 3 _ , - te. 201 I Glenwood Springs, CO 81601 I 970.945.5252 I www.bu-inc.com t 'r DENVER • . . ••••• 0r••••••• ••••••• ...• • • • .... •••••.it •••• ::l: • •• • • •• .�. •.• •••• -•••• ••• • •.e• •...o- .••••;:• •••••• • • • • • •••• • • • • • • • •' .•••• .••• •. • • • • • • • • • • •. • . 13or Civil Engineering Surveying A. & Beyond cc. 923 Cooper Avenue Suite 201 Glenwood Springs, CO 81601 tele: 970.945.5252 fax: 970.384.2833 Scale: 11I =500 Date: 12/191/9 Proj #: 17022.02 File: lema-map. dwg 1' �111 PANEL 1130E IIIIII Q FIRM V� rt•.i FLOOD INSURANCE RATE MAP , ) GARFIELD COUNTY, COLORADO A AND INCORPORATED AREAS PANEL 1130 OF 2075 CON (SEE MAP INDEX FOR FIRM PANEL LAYOUT) CONTAINS: COMMUNITY NR @EE PANFI SUFFIX I th azo GARFIELD COUNTY 080205 1130 E CD \6201 Q0\ III® 07 Notice to User: The Map Number shown below should be used when placing map orders; the Community Number shown above should be used on insurance applications for the subject community. r. OEQA T MAP NUMBER ®• z 08045C1130E . o � EFFECTIVE DATE `�PtgND H illl Federal Emergency Management Agency Scale: 1" = 500' Orchard Creek Ranch, LLC Garfield County, Colorado Steiner Minor Subdivision Floodplain Map