grading erosion and sediment control report for solar - exhibit g - gesc report.pdf · i hereby...

Grading Erosion and Sediment Control Report For

Sundance, LLC Elbert County, CO

Elbert County Case No. ___-___

Prepared For:

Cypress Creek Renewables 3250 Ocean Park Boulevard Suite 355

Santa Monica, CA 90405 Telephone: 303-881-3087

By:

RINA Consulting 705 South Main Street Suite 260

Plymouth, MI 48170 Telephone: 734-634-4088

August 11, 2017

CERTIFICATION STATEMENTS

I. OWNER/DEVELOPER’S STATEMENT:

I hereby certify that the Grading, Erosion, and Sediment Control measures for Sundance Solar, LLC shall be constructed according to the design presented in this document. I understand that additional erosion control, sediment control and water quality enhancing measures may be required of the owner and his or her agents due to unforeseen pollutant discharges or if the submitted plan does not function as intended. The requirements of the plan shall be the obligation of the land owner and/or his successors or heirs; until such time as the plan is properly completed, modified or voided.

Owner or Authorized Agent:

Authorized Signature:

II. ENGINEER’S STATEMENT:

I hereby attest that this Grading, Erosion, and Sediment Control (GESC) document for Sundance Solar, LLC has been prepared by me or under my direct supervision, and to the best of my knowledge and ability has been prepared in accordance with the current version of the Elbert County Construction Standards & Specifications.

Registered Professional Engineer:

State of Colorado Number:

Affix Seal with Date:

Table of Contents

PAGE

GESC REPORT

I. PROJECT DESCRIPTION............................................................................................................. 4 II. EXISTING SITE CONDITIONS ................................................................................................... 4 III. ADJACENT AREAS ...................................................................................................................... 4 IV. SOILS ............................................................................................................................................. 5 V. EARTHWORK AREAS AND VOLUMES ................................................................................... 5 VI. EROSION AND SEDIMENT CONTROL MEASURES .............................................................. 5 VII. TIMING/PHASING SCHEDULE .................................................................................................. 6 VIII. PERMANENT STABILIZATION ................................................................................................. 6 IX. STORMWATER MANAGEMENT CONSIDERATIONS ........................................................... 7 X. MAINTENANCE ........................................................................................................................... 7 XI. OPINION OF PROBABLE COST FOR INSTALLATION OF BMPS ......................................... 7 XII. CALCULATIONS ......................................................................................................................... 7

TABLE OF APPENDICES

APPENDIX A – MAPS & SOIL INFORMATION

Project Location Map FEMA FIRM Map NRCS Soil Information

APPENDIX B – SUPPORTING DOCUMENTS

Engineer’s Cost Estimate for Soil Erosion & Sediment Control BMPs Elbert County Standard Seed Mix Information Impervious Area & Runoff Coefficient Calculations GESC Plans

PROJECT DESCRIPTION

This Grading, Erosion, and Sediment Control (GESC) Report provides remediation for site disturbance resulting from the development of Sundance, LLC. The intent is to obtain a grading and GESC permit to perform the construction operations associated the development of the site. The project is a proposed 75 megawatt community-owned solar facility incorporating a tracker system on approximately 606 acres, within parcels containing 915 acres in Elbert County Colorado. The site is located at southeast corner of Kiowa-Bennett Road and County Road 154 in Kiowa, Colorado, and includes a portion of the south half of Township 7 South, Range 63, West of the 6th Principal Meridian, located within Sections 27, 28, 29 & 33. The site is currently undeveloped agricultural land. Pre-existing drainage patterns will not change throughout the construction of the project. The racking support structure for the tracker system will be mounted on I-beams driven into the ground. The existing ground will not be manipulated to construct the solar system. There will be short gravel access roads that will be constructed to provide access into the solar facilities. A total of approximately 4.7 acres (0.8% of the solar facility area) is proposed to be disturbed during the construction of the project. The project site is located at the southeast corner of the intersection of Kiowa-Bennett Road and County Road 154 in Elbert County. The Elbert County Assessor’s records identifies the pieces of land within the project site as the following parcel ID numbers: 7327200027, 7321400259 & 7327200027. A Project Location Map for the site can be found in Appendix A. EXISTING SITE CONDITIONS

The solar facility area is currently undeveloped and has naturally occurring slopes typically primarily below 10 percent and is covered with native vegetation. Additional detail of the slopes within the solar facility area (within the security fence limits) are listed below. 0 to 5 Percent Slopes = 51.4% of the solar facility area 5 to 10 Percent Slopes = 41.8% of the solar facility area 10 to 15 Percent Slopes = 5.0% of the disturbed area Greater than 15 Percent Slopes = 1.8% of the disturbed area The project areas primarily sheet drain to the west and north except for the portion of land east of Creek 45 Road, which drainage to the east. The site is tributary to Kiowa Creek to the west and Wolf Creek to the east. The site is not located in the 100-year flood boundary based on the FEMA flood insurance rate maps (FIRM). A copy of the FIRM maps, panel 08039C0300C (dated March 17, 2011) can be found in Appendix A. ADJACENT AREAS

The subject properties are adjacent to primarily undeveloped land except for a few residential properties and the existing Intermountain Rural Electric Association substation located on County Road 154. Refer to the Project Location Map included within Appendix A. SOILS

The hydrologic soil characteristics of the watershed areas were obtained from USDA National Resources Conservation Service (NRCS), and available Geographical Information Systems (GIS). The primary soil types are listed below and supporting NRCS soil information for the soil types and names, mapping unit, permeability, hydrologic soil group, texture, etc. is provided in Appendix A.

EARTHWORK AREAS AND VOLUMES

The existing drainage patterns for the proposed site will not change. Grading will be limited to the proposed access roads, any underground utilities, and erosion and sediment control practices. The grading activities for Sundance Solar, LLC will disturb approximately 4.7 acres, and no cuts or fills are proposed as the proposed development will maintain the existing grades and site drainage. The total acreage of the proposed project is approximately 606 acres. EROSION AND SEDIMENT CONTROL MEASURES

Several erosion and sediment control measures are being implemented as part of the proposed soil disturbance activities for Sundance Solar, LLC. The structural erosion and sediment control practices for the site include the use of silt fences, vehicle tracking, and staging areas. Non-structural erosion and sediment control practices for the site include seeding and mulching of all disturbed areas. Installation of the erosion control measures shall conform to the Elbert County Roadway Construction Standards & Specifications, the Elbert County Detail Sheets and Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual. The contractor will be responsible for maintaining the erosion and sediment control measures, and repairing or replacing one or all of the items if they should fail to function as intended. The contractor shall be required to inspect and maintain all erosion and sediment control facilities per Elbert County and UDFCD requirements. Refer to the Grading, Erosion and Sediment Control plans for Sundance Solar, LLC for the location, installation, and maintenance of all proposed grading and erosion control measures. Repairs and clean out of BMP’s are required as necessary. More frequent inspections and repairs shall be required during winter conditions due to freeze/thaw problems. Daily inspections of silt fences and vehicle tracking control are also required. SILT FENCE

Silt fence barriers will be installed adjacent to disturbed areas and surrounding the proposed solar field area, to catch sediment being carried in stormwater flow. Silt fences will be staked into place at no more than 15 foot increments, with the stakes on the down-slope side of the fence fabric. The silt fence shall be 2 to 3 feet in height above grade

Symbol Description Hydrologic Group

5 Bresser sandy loam, 0 to 4 percent slopes B

6 Bresser sandy loam, cool, 5 to 9 percent slopes B

9 Bresser-Truckton sandy loam, 8 to 25 percent slopes B

32 Nunn clay loam, 0 to 4 percent slopes C

41 Truckton sandy loam, 4 to 8 percent slopes B

43 Weld loam, 0 to 4 percent slopes B

with the stakes buried below ground ½ the height of the silt fence above grade (12 inches minimum). The toe of the fence will be buried under soil or gravel to keep sediments from being washed under the silt fencing. Silt Fences shall be inspected daily and following any storm event, maintained and repaired as necessary, and any silt collected shall be removed and reused in site grading activities. VEHICLE TRACKING CONTROL

Vehicle tracking control facilities shall be installed at each entrance/exit from the site to remove loose soil from construction equipment tires, and to prevent the accumulation of soils onto existing streets adjacent to the site. The control pads will be minimum 20-foot-wide by 50-foot-long and will consist of minimum 1-1/2” crushed rock, at a depth of 6” minimum. It shall be the responsibility of the contractor to inspected daily and following storm events, and remove any soil that is tracked onto the existing streets daily. CONCRETE WASHOUT AREA

A concrete washout is a shallow excavation on-site area with a small perimeter berm to isolate concrete truck washout operations. The location of the Concrete Washout Area will be near the construction entrance for the site, and inspected weekly and following storm events, whichever is more frequent. SEEDING AND MULCHING

Seeding shall be applied to all disturbed areas after all grading activities have ended. A proper seed mix shall be used for the site. Refer to the Elbert County standard seed mix information provided in Appendix B. If newly seeded areas need to be temporarily protected, a cover of mulch can provide protection for areas that will not require temporary vegetation. All areas that have been seeded must be mulched. The mulch shall be anchored by mechanical crimps. TIMING/PHASING SCHEDULE

Prior to the commencement of construction, all erosion and sediment control practices outlined on the GESC plans will be installed. This would include the installation of silt fence, vehicle tracking control, concrete washout areas and the stabilized staging areas. All other erosion and sediment control practices will be installed as required after construction has begun. BMP’s associated with the final GESC plan will be installed as part of final site construction. This includes seeding and mulching as required. A chain link fence will be constructed as an initial/interim practice, and shall act as a construction fence. However, the fence shall remain in place for the life of the project for security measures. The anticipated construction of the project will commence on June 2018 until approximately June 2019, for a total of 12 months. After construction has been completed and proper vegetation has been established in accordance with the GESC plans, any temporary BMPs shown to be removed on the GESC plans shall be removed. This is at the discretion of the GESC Inspector. The remaining BMPs shall remain in place until vegetation is established for the site. Initial BMP’s will be installed prior to the start of grading operations. Interim BMP’s will be installed after utility construction prior to site paving. Final BMP’s will be installed after all site construction is completed. PERMANENT STABILIZATION

All disturbed areas on-site without hardscape will be seeded and mulched with permanent seed mix or landscape per the plan. Application of the approved seed mix will be performed by the approved methods in the Elbert County Roadway Construction Standards & Specifications and the Elbert County Detail Sheets. All seeded areas shall be mulched after seeding on the same day.

STORMWATER MANAGEMENT CONSIDERATIONS

Runoff will travel through the site by following the existing drainage patterns. Stormwater runoff velocities during construction shall be controlled in all areas of disturbed soils. Measures such as silt fence surrounding the project site and located down slope of disturbed areas adjacent to existing water areas on-site are provided to control velocities of stormwater runoff and prevent silt from construction activities from traveling offsite or into the on-site water areas. MAINTENANCE

The GESC Manager shall plan, install and maintain all erosion control measures as indicated on the GESC plan as necessary to prevent sediment deposition off-site. The GESC Manager is responsible for cleanup of sediment or construction debris tracked onto adjacent paved areas. Paved areas including streets are to be kept clean throughout build-out and shall be cleaned with a street sweeper or a similar device at first notice of accidental tracking or at the discretion of the GESC inspector. All erosion and sediment control measures will be cleaned and repaired as outlined in the standard notes and details, which can be found on the GESC plans. No special maintenance requirements are needed at this time. OPINION OF PROBABLE COST FOR INSTALLATION OF BMPS

The estimated cost for the soil erosion and sediment control BMPs is $103,305.00. A cost estimate spreadsheet is included in Appendix B. CALCULATIONS

Per the UDFCD Manual, the runoff coefficients of the existing (historical) and proposed conditions of the subject parcels were calculated. The existing (historical) conditions has a 100-yr storm Runoff Coefficient (CH) of 0.20. The proposed conditions will result in in a 100-yr storm Runoff Coefficient (CD) of 0.2008. The proposed solar facility will result in an increase in the 100-yr storm Runoff Coefficient of 0.0008. Based on this minor increase, permanent stormwater BMP’s such as stormwater detention facilities have not been designed for this site. Refer to the Runoff Coefficient Calculations in Appendix B for further detailed impervious area calculations.

Appendix A Project Location Map

FEMA FIRM Map NRCS Soil Information

RINA Consulting 705 S Main St., Suite 260 Plymouth, MI 48170

Sundance Solar - Kiowa, CO Final GESC Report

Image courtesy of USGS Earthstar Geographics SIO © 2017 Microsoft Corporation

PROPOSED SUBSTATION

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5 Bresser sandy loam, 0 to 4percent slopes

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Totals for Area of Interest 946.6 100.0%

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Soi

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cale

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r lar

ger.

Dat

e(s)

aer

ial i

mag

es w

ere

phot

ogra

phed

: A

pr 1

5, 2

011—

Sep

22, 2

011

The

orth

opho

to o

r oth

er b

ase

map

on

whi

ch th

e so

il lin

es w

ere

com

pile

d an

d di

gitiz

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diffe

rs fr

om th

e ba

ckgr

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ery

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e m

aps.

As

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Soi

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epor

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Table—Drainage Class

Drainage Class— Summary by Map Unit — Elbert County, Colorado, Western Part (CO623)

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

5 Bresser sandy loam, 0 to4 percent slopes

Well drained 177.9 18.8%

6 Bresser sandy loam,cool, 5 to 9 percentslopes


9 Bresser-Truckton sandyloams, 8 to 25 percentslopes


32 Nunn clay loam, 0 to 4percent slopes


41 Truckton sandy loam, 4to 8 percent slopes


43 Weld loam, 0 to 4percent slopes



Rating Options—Drainage Class

Aggregation Method: Dominant Condition

Component Percent Cutoff: None Specified

Tie-break Rule: Higher

Hydrologic Soil Group

Hydrologic soil groups are based on estimates of runoff potential. Soils areassigned to one of four groups according to the rate of water infiltration when thesoils are not protected by vegetation, are thoroughly wet, and receive precipitationfrom long-duration storms.

The soils in the United States are assigned to four groups (A, B, C, and D) andthree dual classes (A/D, B/D, and C/D). The groups are defined as follows:

Group A. Soils having a high infiltration rate (low runoff potential) when thoroughlywet. These consist mainly of deep, well drained to excessively drained sands orgravelly sands. These soils have a high rate of water transmission.

Group B. Soils having a moderate infiltration rate when thoroughly wet. Theseconsist chiefly of moderately deep or deep, moderately well drained or well drainedsoils that have moderately fine texture to moderately coarse texture. These soilshave a moderate rate of water transmission.




Group C. Soils having a slow infiltration rate when thoroughly wet. These consistchiefly of soils having a layer that impedes the downward movement of water orsoils of moderately fine texture or fine texture. These soils have a slow rate of watertransmission.

Group D. Soils having a very slow infiltration rate (high runoff potential) whenthoroughly wet. These consist chiefly of clays that have a high shrink-swellpotential, soils that have a high water table, soils that have a claypan or clay layer ator near the surface, and soils that are shallow over nearly impervious material.These soils have a very slow rate of water transmission.

If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter isfor drained areas and the second is for undrained areas. Only the soils that in theirnatural condition are in group D are assigned to dual classes.




Cus

tom

Soi

l Res

ourc

e R

epor

tM

ap—

Hyd

rolo

gic

Soi

l Gro

up

43608004361200436160043620004362400436280043632004363600

43608004361200436160043620004362400436280043632004363600

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6500

5469

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5477

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8100

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5469

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5477

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8100

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8900

5493

0054

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39° 2

5' 1

7'' N

104° 28' 28'' W39

° 2

5' 1

7'' N

104° 25' 18'' W

39° 2

3' 4

2'' N

104° 28' 28'' W

39° 2

3' 4

2'' N

104° 25' 18'' W

N

Map

pro

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Web

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orne

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: WGS

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MA

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RM

ATIO

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Are

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(AO

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Soils So

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B B/D

C C/D

D Not

rate

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Soil

Rat

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sA A

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B B/D

C C/D

D Not

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Rat

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/D

B B/D

C C/D

D Not

rate

d or

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ava

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Wat

er F

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Stre

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and

Can

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Tran

spor

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Inte

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ighw

ays

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Rou

tes

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or R

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ped

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et fo

r map

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ts.

Sou

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of M

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ion

12, S

ep 2

3, 2

016

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l map

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ts a

re la

bele

d (a

s sp

ace

allo

ws)

for m

ap s

cale

s1:

50,0

00 o

r lar

ger.

Dat

e(s)

aer

ial i

mag

es w

ere

phot

ogra

phed

: A

pr 1

5, 2

011—

Sep

22, 2

011

The

orth

opho

to o

r oth

er b

ase

map

on

whi

ch th

e so

il lin

es w

ere

com

pile

d an

d di

gitiz

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roba

bly

diffe

rs fr

om th

e ba

ckgr

ound

imag

ery

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laye

d on

thes

e m

aps.

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a re

sult,

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e m

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of m

ap u

nit b

ound

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iden

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Cus

tom

Soi

l Res

ourc

e R

epor

t



Table—Hydrologic Soil Group

Hydrologic Soil Group— Summary by Map Unit — Elbert County, Colorado, Western Part (CO623)



B 177.9 18.8%


B 476.5 50.3%


B 150.3 15.9%


C 20.8 2.2%


B 79.3 8.4%


C 41.9 4.4%





Cus

tom

Soi

l Res

ourc

e R

epor

tM

ap—

K F

acto

r, W

hole

Soi

l

43608004361200436160043620004362400436280043632004363600

43608004361200436160043620004362400436280043632004363600

5453

0054

5700

5461

0054

6500

5469

0054

7300

5477

0054

8100

5485

0054

8900

5493

0054

9700

5453

0054

5700

5461

0054

6500

5469

0054

7300

5477

0054

8100

5485

0054

8900

5493

0054

9700

39° 2

5' 1

7'' N

104° 28' 28'' W39

° 2

5' 1

7'' N

104° 25' 18'' W

39° 2

3' 4

2'' N

104° 28' 28'' W

39° 2

3' 4

2'' N

104° 25' 18'' W

N

Map

pro

ject

ion:

Web

Mer

cato

r C

orne

r coo

rdin

ates

: WGS

84

Edge

tics

: UTM

Zon

e 13

N W

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010

0020

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030

060

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Map

Sca

le: 1

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700

if pr

inte

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ape

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x 8

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shee

t.



MA

P LE

GEN

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AP

INFO

RM

ATIO

N

Are

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Inte

rest

(AO

I)A

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of In

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Soils So

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2

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s.0

2

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d or

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Poin

ts.0

2

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.43

.49

.55

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Not

rate

d or

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ilabl

e

Wat

er F

eatu

res

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ams

and

Can

als

Tran

spor

tatio

nR

ails

Inte

rsta

te H

ighw

ays

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Rou

tes

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or R

oads

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l Roa

ds

Bac

kgro

und A

eria

l Pho

togr

aphy

The

soil

surv

eys

that

com

pris

e yo

ur A

OI w

ere

map

ped

at1:

24,0

00.

Ple

ase

rely

on

the

bar s

cale

on

each

map

she

et fo

r map

mea

sure

men

ts.

Sou

rce

of M

ap:

Nat

ural

Res

ourc

es C

onse

rvat

ion

Ser

vice

Web

Soi

l Sur

vey

UR

L:C

oord

inat

e S

yste

m:

Web

Mer

cato

r (E

PS

G:3

857)

Map

s fro

m th

e W

eb S

oil S

urve

y ar

e ba

sed

on th

e W

eb M

erca

tor

proj

ectio

n, w

hich

pre

serv

es d

irect

ion

and

shap

e bu

t dis

torts

dist

ance

and

are

a. A

pro

ject

ion

that

pre

serv

es a

rea,

suc

h as

the

Alb

ers

equa

l-are

a co

nic

proj

ectio

n, s

houl

d be

use

d if

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eac

cura

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alcu

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DA

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tifie

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on d

ate(

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sted

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l Sur

vey

Are

a:

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ount

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olor

ado,

Wes

tern

Par

tS

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Dat

a:

Vers

ion

12, S

ep 2

3, 2

016

Soi

l map

uni

ts a

re la

bele

d (a

s sp

ace

allo

ws)

for m

ap s

cale

s1:

50,0

00 o

r lar

ger.

Dat

e(s)

aer

ial i

mag

es w

ere

phot

ogra

phed

: A

pr 1

5, 2

011—

Sep

22, 2

011

The

orth

opho

to o

r oth

er b

ase

map

on

whi

ch th

e so

il lin

es w

ere

com

pile

d an

d di

gitiz

ed p

roba

bly

diffe

rs fr

om th

e ba

ckgr

ound

imag

ery

disp

laye

d on

thes

e m

aps.

As

a re

sult,

som

e m

inor

shift

ing

of m

ap u

nit b

ound

arie

s m

ay b

e ev

iden

t.

Cus

tom

Soi

l Res

ourc

e R

epor

t



Table—K Factor, Whole Soil

K Factor, Whole Soil— Summary by Map Unit — Elbert County, Colorado, Western Part (CO623)



.17 177.9 18.8%


.15 476.5 50.3%


.17 150.3 15.9%


.28 20.8 2.2%


.24 79.3 8.4%


.24 41.9 4.4%





Appendix B Engineer’s Cost Estimate for Soil Erosion & Sediment Control BMPs

Elbert County Standard Seed Mix Information Runoff Coefficient Calculations

GESC Plans



Project: Computed: KMKClient: Checked: JJHLocation: Date: August 8, 2017

Check Dam CD LF 24.00$ -$ Construction Fence CF LF 2.00$ -$ Concrete Washout Area CWA EA 2,500.00$ 3 7,500.00$ Diversion Ditch DD LF 1.60$ -$ Inlet Protection IP EA 200.00$ -$ Sediment Basin SB AC 1,000.00$ -$ Sediment Trap ST EA 600.00$ -$ Seeding and Mulching SM AC 1,500.00$ 4.7 7,050.00$ Stabilized Staging Area SSA SY 2.00$ 7,500 15,000.00$ Silt Fence SF LF 1.50$ 47,170 70,755.00$ Vehicle Tracking Control VTC EA 1,000.00$ 3 3,000.00$ Straw Bale Barrier STB LF 2.00$ -$

Total Cost of BMPs = 103,305.00$

Sundance Solar, LLCCypress Creek RenewablesKiowa, Elbert County, CO

INSTALLATION UNIT COST

UNITSPLAN IDBMP DESCRIPTION BMP QUANTITY BMP COST

Engineers Cost Estimate for Soil Erosion & Sediment Control BMPs



Proj

ect:

Sund

ance

Sol

ar, L

LCCo

mpu

ted:

KMK

Clie

nt:

CCR

Chec

ked:

JJH

Loca

tion:

Kiow

a, E

lber

t Cou

nty,

CO

Date

:Au

gust

8, 2

017

Parc

elTo

tal P

arce

l Are

aGr

avel

Gree

nbel

ts, A

gric

ultu

ral

Impe

rvio

us A

rea*

Impe

rvio

us A

rea*

Impe

rvio

us A

rea

per A

cre*

(Acr

es)

(Acr

es)

(Acr

es)

(acr

e)(A

cre

per A

cre)

A31

4.05

0.0

314.

12.

00%

6.28

0.02

0B

286.

040.

028

6.0

2.00

%5.

720.

020

C31

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0.0

315.

22.

00%

6.30

0.02

0TO

TAL

OR

AVG.

915.

270.

091

5.3

2.00

%18

.31

0.02

0

Incr

ease

inPa

rcel

Tota

l Par

cel A

rea

Grav

elCo

ncre

te P

ads

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rete

Pad

sSo

lar A

rray

Pan

els

I-Bea

ms

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ms

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nbel

ts, A

gric

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ral

Impe

rvio

us A

rea*

Impe

rvio

us A

rea*

Impe

rvio

us A

rea

per A

cre*

Impe

rvio

us A

rea

(Acr

es)

(Sft

)(S

ft)

(Sft

)(A

cres

)(a

cre)

(Acr

e pe

r Acr

e)(A

cre

per A

cre)

A31

4.05

7,78

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3,50

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6,89

715

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02.

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5.77

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Cons

truc

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dard

s & S

peci

ficat

ions

, Sec

tion

611.

05.

Pave

d =

100%

, Gra

vel =

40%

Impe

rvio

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reen

belts

, Agr

icul

tura

l = 2

% Im

perv

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oric

al F

low

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effic

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2-yr

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(C)



grading erosion and sediment control report for solar - exhibit g - gesc report.pdf · i hereby...

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