epc planning & community eng-ms20001-r1-fdr-redlines … · 2020. 2. 4. ·...

ENG-MS20001-R1-FDR-redlines Summary_Markup Summary

Subject: EPC ENG ApprovalPage Index: 1Date: 2/3/2020 1:33:30 PMAuthor: dsdriceColor: Layer: Space: Page Label: 1

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MS-20-001

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Subject: CalloutPage Index: 4Date: 2/3/2020 9:33:15 PMAuthor: dsdriceColor: Layer: Space: Page Label: 4

incomplete


Add DCM update

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Subject: Cloud+Page Index: 5Date: 2/3/2020 9:36:32 PMAuthor: dsdriceColor: Layer: Space: Page Label: 5

2019

17

02/03/2020 1:33:24 PM

EPC Planning & CommunityDevelopment Department

Engineering Review

[email protected]

(719) 520-7877

No. 031901 No. SF-19-___

MS-20-001

is a fully at the Business

ne. The property is currently an t Quarter of Section 1, Township orado. The project will include

s Meadows Drive, which is a fullyf approximately 140 feet at the

y platted as Lot 1, Latigo Business t Grass Meadows Drive.

incomplete

ge Plan, Bent Grass Subdivision,” revised D

Design Group, “Falcon Drainage Basin Pla

/NRCS, “Custom Soil Resource Report for 19.

EXISTING DRAINAGE CONDITION

isting site topography generally slopes dowge of 1-4 percent. According to the Soil Sonservation Service (SCS), on-site soils ar

Add DCM update

a Manual, Volumes 1 and 2,” revised May, 2014.

s, LLC, “Preliminary Drainage Report for Bent ne, 2014.

,” revised November, 1991.

ual,” revised December 13, 2016.

Number 08041C0553G, December 7, 2018.

rainage Report and Erosion Control Plan, Latigo ember 30, 2004.

r Development Drainage Plan and Preliminary vised December 18, 2006.

2019


See comment letter.

6 (1)


Address who is anticipated to construct theimprovements.

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Pond WU is currently not functioning properly andis not FSD.


proposed WQCV facilities

Subject: HighlightPage Index: 8Date: 2/3/2020 9:45:16 PMAuthor: dsdriceColor: Layer: Space: Page Label: 8

8 (2)


Clarify DBPS recommended improvements andwhat Bent Grass Residential proposes toconstruct.

with protective slopes to age swales and a private ge channel on the east ted locations, collecting el.

age across the Phase 1 e 13) located in the rivate Storm Sewer A1 and Storm Sewer A2

See comment letter.

y Channel downstream of this site. As such, on-site flows from the proposed g Subdivision are relatively small in comparison to the total flows in the West ry Channel.

ng to the Falcon DBPS, proposed regional channel improvements include re-hing a natural cross section and implementing a series of Rock Cross Vanes for ontrol (see Matrix Sheet 6-11, Appendix D). In conjunction with subdivision this site will pay drainage basin fees towards the recommended regional drainage improvements.

ogic calculations for the site are detailed in the attached spreadsheets (Appendix peak flows are identified on Figures EX1 and D1 (Appendix E).

tractor will be required to implement standard best management practices for control during construction.

DRAINAGE PLANNING FOUR STEP PROCESS

County Drainage Criteria require drainage planning to include a Four Step for receiving water protection that focuses on reducing runoff volumes, treating er quality capture volume (WQCV), stabilizing drainageways, and implementing m source controls.

d in DCM Volume 2, the Four Step Process is applicable to all new and re-

Address who is anticipated to construct the improvements.

mancave\admin\Drainage\FDR-Deyoung-1219.doc 4

oy Runoff Reduction Practices mize Impacts: The existing drainage channel area crossing the east side of operty will be preserved as a drainage easement. No development is sed in the easterly part of the property, which will minimize developed ge impacts.

ize Drainageways alcon Basin West Tributary Channel flows south across the east side of this ty. This site will pay Drainage Basin Fees as the applicable cost share

ds the drainage channel improvements recommended in the Falcon Drainage Planning Study.

de Water Quality Capture Volume (WQCV) eveloped site will drain southeasterly to the existing downstream Regional tion Pond WU, which provides stormwater detention and water quality tion. The regional detention pond will capture and slowly release the V over a 40-hour design release period.

Pond WU is currently not functioningproperly and is not FSD.

-1219.doc 4

Volume (WQCV) heasterly to the existing downstream Regional des stormwater detention and water quality n pond will capture and slowly release the ease period.

proposed WQCVfacilities

Z:\031901.hammers-mancave\admin\Drainage\FDR-Deyoung-1219.doc 5

VI. STORMWATER DETENTION AND WATER QUALITY The proposed drainage and grading plan for the site conveys developed drainage southeasterly across the site to the existing Falcon Basin West Tributary Drainage Channel, which flows south to Regional Detention Pond WU. The existing Regional Detention Pond WU is located at the northwest corner of Meridian Road and US Highway 24. According to the 2015 “Falcon Drainage Basin Planning Study” (DBPS) by Matrix Design Group, the existing regional detention pond has a capacity of 39.5 acre-feet and provides the required stormwater detention and water quality mitigation for this site. Clarify DBPS recommended improvements and whatBent Grass Residential proposes to construct.


$4,232

9 (4)



Subtract tract area.


$30,807


59 (9)


11.14 ac

ac.) @ ($29,622/ac.) = $329,98

ac.) @ ($4,069/ac.) = $ 45,32

with the proposed “Mancave” storage remain consistent with existing condi

$4,232

on Drainage Basin is subject to an El Paso County 2019 ,622 per impervious acre, and a bridge fee of $4,069 per uired drainage and bridge fees are due at the time of recording

unty Engineering Criteria Manual Section 3.13a, the required bdivision plats are assessed based upon the new impervious en previously paid. As such, the required basin fees are eveloped impervious area calculation for this site.

d bridge fees are calculated as follows:

17.173 acres vious Area: 11.14 acres rea: 11.14 acres

(11.14 ac.) @ ($29,622/ac.) = $329,989.08

(11.14 ac.) @ ($4,069/ac.) = $ 45,328.66

patterns associated with the proposed “Mancave” storage

Subtract tract area.

1 1 1

c.) @ ($29,622/ac.) = $

c.) @ ($4,069/ac.) = $

$30,807







BLD

G. G

BLD

G.

GB

BLD

G.

G


Ultimate (for information only)


Tract __

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Ultimate (forinformation only)

Tract __





Subject: Length MeasurementPage Index: 60Date: 2/3/2020 6:15:21 PMAuthor: dsdriceColor: Layer: Space: Page Label: 60

108.90 ft


110.59 ft

108.90 ft

110.59 ft


121.44 ft

121.44 ft

epc planning & community eng-ms20001-r1-fdr-redlines … · 2020. 2. 4. ·...

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