Plant_Establishment_Plan.pdf

1-Yr Plant Establishment Plan” - Page 1 of 6

1-YR PLANT ESTABLISHMENT PLAN

Project Name: Munger Rd Bridge #1005 & 2001 (224008) Primary Contractor: (Name) Landscape Contractor: (Name) Landscape Contractor Contact: (Name, Phone #) Plan Duration Period: 1-year following substantial completion.

The purpose of the Plant Establishment Plan (Plan) is to specify required management activities to be performed in ACHD-owned green stormwater facilities during the vegetation establishment period. For the purpose of this plan the vegetation establishment period will consist of at least one complete growing season (April – September). If vegetation is installed during the growing season, the Plan duration will be extended until September 30 of the following year. Management objectives are as follows: the promotion of desirable vegetation, weed removal, and erosion control. The Contractor shall not use fertilizer, pesticides, and/or herbicides of any kind in the stormwater facilities. Care shall be taken during all activities to protect desirable vegetation and to prevent damage to the green stormwater infrastructure (GSI) facilities. It is the Contractor’s responsibility to correctly identify desirable versus undesirable plant species. All questions and/or comments can be directed to the ACHD Construction Coordinator.

The following Green Stormwater Infrastructure (GSI) Facility shall be maintained under this plan:

1. Detention Basin, ID# 1701 (Munger Rd & Catamaran Way) (Attachment A_Munger Rd Bridge)

A. SAFETY

The Contractor shall be solely and completely responsible for safety conditions at the job site, including safety of all persons (including employees) and property during performance of the Work. This requirement shall apply continuously and not be limited to normal working hours.

Safety provisions shall conform to U.S. Department of Labor (OSHA), the State Occupational Safety and Health Act, and all other applicable federal, state, county and local laws, ordinance, codes, those requirements set forth below and any regulations that may be detailed in other parts of these Contract Documents.

When any of these requirements are in conflict, the more stringent requirement shall be followed. The Contractor’s failure to thoroughly familiarize himself with all safety requirements shall not relieve him from compliance with the obligations and penalties set forth herein.

1-Yr Plant Establishment Plan” - Page 2 of 6

B. SITE WALKTHROUGHS

Contractor shall complete a minimum of three (3) site walkthroughs with ACHD during the establishment period. Site walkthroughs will ensure continual communication between the Contractor and ACHD, while improving management success. It is the Contractor’s responsibility to contact ACHD Project Coordinator to schedule the following walkthroughs prior to the start of the establishment period. Contractors are welcome to request additional walkthrough at any time during the establishment period.

1. Initial walkthrough

2. Mid-growing season walkthrough to provide feedback.

3. End of year walkthrough to evaluate overall success.

C. DAILY ACTIVITY REPORT

The Contractor’s field crew(s) shall complete an electronic Daily Activity Report for all work performed during each site visit prior to leaving the site in accordance with the Site Management Schedule (Table 1). Activity reports enable the Contractor to track, manage, and meet management objectives. Activity reports also facilitate continual communication and provide a means to monitor the progression of the site. The Contractor shall use the Daily Activity Reports to share observations, recommendations, questions, and comments. The Contractor shall complete a damage report, take photos, and immediately notify ACHD Construction Coordinator of all damages. It is the contractor’s responsibility to supply their own electronic device (tablet or smart phone) and internet connection. The following computer apps will be needed: Survey123 and ArcGIS Field Map app. ACHD will provide an ArcGIS account and training for supervisor(s).

D. WEED CONTROL

Contractor shall complete site inspection and weed removal at a minimum of every two (2) weeks in April, May, June, and July, and once (1) a month in March, August, and September in accordance with the Site Management Schedule (Table 1). During each site visit the Contractor shall inspect the lawn for damage and potential pest problems and suggest possible solutions. Using the Daily Activity Report, Contractor shall report all problems and damages to ACHD Construction Coordinator along with recommended solutions. Photos must be included.

Contractor shall be responsible for maintaining both the lawn and vegetation-free areas as indicated on Attachment A. Maintenance areas include but are not limited to the GSI facility, fence lines (1- foot buffer on both sides), access roads, ramps, and edges along sidewalks.

Weed control objectives include weed removal, reduction of weed based competition, prevention of weed seed production and distribution, eradication of all noxious and invasive species, and maintaining the overall aesthetic value of the site.

1-Yr Plant Establishment Plan” - Page 3 of 6

Manual weed removal methods include hand-pulling, grubbing, and other non-mechanical methods and shall be utilized in areas where mechanical equipment may damage the lawn or structures (fence, irrigation, pipes, signs, etc.). Contractor shall manually remove weeds growing within newly seeded areas. Manual weed removal shall also be used to remove low growing weeds that mechanical methods cannot effectively remove.

Contractors shall clean all mechanical equipment prior to performing work on site to prevent introduction of weed seed and pathogens into the facility. All clippings shall be raked up and disposed of properly to maintain a clean appearance.

Clippings shall not be blown or swept into street, gutters, or GSI facilities. It is the Contractor’s responsibility to replace items/plants damaged by landscape maintenance actions at the Contractor’s expense.

E. Mowing & Edging

Contractor shall mow & edge weekly from May through September in accordance with the Site Management Schedule (Table 1). Contractor shall edge along sidewalks, fences, signs, structures, access roads, etc. to provide a clean appearance. During each site visit the Contractor shall inspect the lawn for damage and potential pest problems and suggest possible solutions.

To prevent lawn mowers from creating tire ruts in the lawn Contractor shall not mow the lawn if the grass is wet. If moisture persists in the bottom of the basin Contractors can use weed eaters to trim the grass. Contractor shall wait to mow the seeded areas until the newly sprouted grass is at least 3-inches tall and roots are well established.

Contractors shall clean all mechanical equipment prior to performing work on site to prevent introduction of weed seed and pathogens into the facility. All clippings shall be raked up and disposed of properly to maintain a clean appearance.

Clippings shall not be blown or swept into street, gutters, or GSI facility. It is the Contractor’s responsibility to replace items/plants damaged by landscape maintenance actions at the Contractor’s expense.

F. CLEAN-UP

Clean up shall occur as needed while completing other tasks in accordance with the Site Management Schedule (Table 1). Contractor shall keep inlets/outlets free of blocking vegetation/debris to ensure stormwater flows freely into and from the facility. Contactors shall notify ACHD if debris is collecting behind the inlet grates.

All trash (debris, paper, cans, bottles, etc.) shall be removed from the site, and disposed of properly. Contractor shall rake out tire tracks, footprints, and minor erosion damage. Contractor shall remove leaves as needed. Debris of any kind shall not be swept or blown into the street, gutter, or the GSI facility. Unusually large items found in the facilities shall be reported to ACHD Construction Coordinator.

1-Yr Plant Establishment Plan” - Page 4 of 6

G. SPRINKLER MAINTENANCE, SCHDEDULE, AUDIT, AND WINTERIZATION

Contractor shall ensure sprinkler system is working properly. Damaged or malfunctioning sprinklers and/or irrigation lines shall be reported to ACHD.

Contractor will be responsible for making the necessary repairs upon approval from the ACHD Construction Coordinator.

Contractor shall complete an irrigation schedule for the GSI facility and submit it to ACHD prior to the start of the establishment period. An irrigation schedule template has been provided (Table 2) An electronic copy of the irrigation schedule can be provided upon request. Contractor shall notify ACHD one (1) week prior to turning the sprinklers system on or off. Contractor shall ensure all sprinklers are operating as intended throughout the establishment period.

Irrigation audits shall occur once a month during the offseason and twice a month during the peak season in accordance with the site Management Schedule (Table 1). For the purpose of this plan peak irrigation season is when the vegetations’ demand for water is at its highest. Peak irrigation season can vary but usually occurs in July and August.

It is the Contractor’s responsibility to know how to properly irrigate the lawn and newly seeded areas. It is the Contractor’s responsibility to replace items/plants damaged by improper watering at the Contractor’s expense.

Sprinkler systems shall be winterized during the month of October. Contractor will notify ACHD one (1) week prior to winterizing the irrigation system and once winterization has been completed. If the sprinkler system is damaged during the winterization process, it is the Contractor’s responsibility to replace damaged components at Contractor’s expense.

H. RESEEDING LAWNED AREA

ACHD shall evaluate the establishment of the lawn by September 15th to determine if reseeding will be required. Contractor shall be responsible for reseeding any areas with poorly establishment by September 30th unless otherwise agreed upon. ACHD shall provide additional seed if needed.

1-Yr Plant Establishment Plan” - Page 5 of 6

Table 1. Management Schedule

This management schedule is subject to change depending on plant instillation completion date. ACHD Construction Coordinator shall provide an updated management schedule once the plant instillation has been inspected and approved. This vegetation establishment period will consist of at least one complete growing season (April – September). If vegetation is installed during the growing season, the Plan duration will be extended until September 30 of the following year.

Management Schedule

Management Activity Month

Oct Nov Dec Jan Feb Mar Apr May June July Aug Sept

A. Safety X X X X X X X X

B. Site Walkthroughs X3 X3 X3

C. Activity Reports X X2 X2 X2 X2 X2 X

D. Weed Control X X2 X2 X2 X2 X X

E. Mowing & Edging X4 X4 X4 X4 X4

F. Clean-Up X X2 X2 X2 X2 X2 X

G. Irrigation Maintenance X X X X2 X2 X2 X

H. Sprinkler Winterization X

I. Reseeding X Notes:

X - Indicates that the management activity shall only occur once a month.

X2 - Indicates that the management activity shall occur twice a month.

X3 - Specific date and time to be determined by contractor in coordination with ACHD.

X4 - Indicates that the management activity shall occur weekly.

1-Yr Plant Establishment Plan” - Page 6 of 6

Table 2. Irrigation Schedule Template

The Contractor must provide irrigation schedules for all GSIs before the plant establishment period. Irrigation schedule shall specify the rates in inches per minute and per week in the notes. Below is an example template. A digital copy can be provided upon request.

Irrigation Schedule - Facility Name Here (location here)

Zones Month Watering Start Times Run Time

Per Cycle (Min) Mon Tue Wed Thru Fri Sat Sun 1st Time 2nd Time 3rd Time 4th Time

Example: Zone 1 X X X 6:00 AM 12:00 PM 30 min

Monthly Seasonal Adjustments (%)

March April May June July August September October

Notes:

Example:

Rate per Minute: .33" Rate per Week: 1.32" sgose Image sgose Image sgose Image sgose Polygon sgose Text Box Basin sgose Rectangle sgose Rectangle sgose Rectangle sgose Rectangle sgose Text Box Attachment A - Munger Rd Bridge

Sew Sew

Sew Sew

Sew

W W

W W

W W

W W

W W

W W

W

O P

O P

O P

O P

O P

O P

O P

O P

P/L P/L

P/L P/L

P/L

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R x x x x x x x x x x

Sew Sew

Sew Sew

Sew

W W

W W

W W

W W

W W

W W

W

O P

O P

O P

O P

O P

O P

O P

O P

P/L P/L

P/L P/L

P/L

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R

IR

R x x x x x x x x x x

B

Revisions: Design By: C. McAlister Date: 08/21/2025 Date: 08/21/2025Drawn By: K. Parker Survey By: G. Bailey Date: 01/31/2025

Ada County Highway District Project Number:

N O T E S

3775 Adams Street, Garden City, Idaho, 83714 www.achdidaho.org Project Number: 224008 Project Name: Munger Rd Bridges #1005 11 Of 14Sheet

4:

PLAN VIEW OF STARCREEK 4 BASIN

SECTION VIEW A-A OF STARCREEK 4 BASIN

EXISTING TOP OF

BASIN: 2462.50

BASIN BOTTOM EXPANSION TIE-IN

(MATCH EXISTING)

STA/OFF: 8+07.36, 110.25' RT

ELEV. 2459.50±

PROPOSED BASIN BOTTOM

STA/OFF: 8+09.22, 125.72' RT

ELEV. 2459.50

PROPOSED BASIN TOP

STA/OFF: 8+10.78,

138.62' RT

ELEV. 2462.50

A

A

PROPOSED GRADE

EXISTING GRADE

PROPOSED PIPE

12" IE (W): 2459.38

SEE PLAN SHEET

TABLE 2. BASIN DESIGN

DESIGN CRITERIA EXISTING EXPANSION 3 TOTAL

PROPOSED

BASIN BOTTOM AREA (SF) 730 1 +1,220 1,950

BASIN TOP AREA (SF) 3,507 1 +1,208 4,714

RUNOFF VOLUME (CF)

100-YR; 1 HR 6,596 2 +1,703 8,299

TOTAL STORAGE VOLUME (CF)

100-YR; 1 HR 4,513 1 +6,014 10,527

MINIMUM TOP OF BASIN

ELEVATION 2462.50

BOTTOM OF BASIN TIE-IN

ELEVATION 2459.50

SECTION VIEW B-B OF STARCREEK 4 BASIN

PRIMARY PRIMARY

EXPANSION FOREBAY PRIMARY PRIMARY

EXPANSION

B

4:1

4:1

27.3'

27.2' 12.9'

REMOVE EXISTING BERM

STA/OFF: 7+78.27, 92.60' RT

ELEV. 2461.44

BASIN BOTTOM EXPANSION

(MATCH EXISTING)

STA/OFF: 7+72.98, 101.30' RT

ELEV. 2459.50

PROPOSED BASIN BOTTOM

STA/OFF: 8+17.39, 109.13' RT

ELEV. 2459.50

Clearing and Grubbing, Item 201.4.1.B.1

Removal of Pipe, 20 LF, Item 201.4.1.E.1

GSI Topsoil, Item SP 25050.1

GSI Seeding, Item SP 20209.1

Inlet Protection Apron and Flow Spreader, Per SD 628, Item SP 07001

Detention Facilities (Dry Extended Detention), Item 0207.4.1.C.07

Remove and Reset Sprinkler System, Item SSP 29101

Retain and Protect

Sodding, Item 1007.4.1.C.1

21 23

PROPOSED TOP OF BASIN

STA/OFF: 8+30.86, 114.70' RT

ELEV. 2462.50

EXISTING GRADE

100-YR WSE: 2462.00

PROPOSED GRADE

100-YR WSE: 2462.00

SEE ROADWAY SHEET

EXISTING OUTLET STRUCTURE

63.0' 35.4'

D

1. FROM DEA SURVEY, 10/23/2024.

2. FROM AS-BUILTS FOR STARCREEK NO. 4 SUBDIVISION,

05/02/2019.

3. EXPANSION OF BASIN ONLY IN PRIMARY BAY OF EXISTING DETENTION

BASIN. SEE TABLE 1 FOR BASIN SPECIFICATIONS.

4. DO NOT RELOCATE SPRINKLER SYSTEM (HEADS, SUPPLY LINES, AND

OTHER COMPONENTS) WITHIN THE STORMWATER BASIN. ALL SPRINKLER

COMPONENTS MUST BE BEYOND TOP OF BASIN.

5. PLACE GSI TOPSOIL AND GSI SEEDING FROM TOP OF BASIN, OVER

SLOPES, AND TO BOTTOM OF BASIN.

EXISTING TOP OF BASIN

STA/OFF: 8+02.72, 71.81' RT

ELEV. 2462.50

EXISTING TOP OF BASIN

STA/OFF: 7+38.39, 76.48' RT

ELEV. 2462.50

4:

4:

BASIN BOTTOM EXPANSION TIE-IN

(MATCH EXISTING)

STA/OFF: 7+67.22, 88.39' RT

ELEV. 2459.70±

BASIN BOTTOM EXPANSION TIE-IN

(MATCH EXISTING)

STA/OFF: 7+86.63, 96.28' RT

ELEV. 2459.50±

L E G E N D

CLEARING AND GRUBBING AREA

DETENTION FACILITIES, EXCAVATION AREA

23 6

TABLE 3. SHEET QUANTITIES

6 CLEARING AND GRUBBING 237 SY

13 GSI TOPSOIL 515 SY

14 GSI SEEDING 515 SY

21 DETENTION FACILITIES 220 CY

23 SPRINKLER REMOVE AND RESET 280 LF

55 SODDING 11 SY

13 14

REMOVE

BERM

TABLE 1. POND DESIGN POINTS

POINT STA OFFSET ELEVATION NOTES

A 7+38.39 46.48' RT 2462.50' TOP OF POND

B 8+02.72 71.81' RT 2462.50' TOP OF POND

C 8+23.77 72.17' RT 2462.50' TOP OF POND

D 8+42.25 82.72' RT 2462.50' TOP OF POND

E 8+36.00 109.13' RT 2462.50' TOP OF POND

F 8+30.86 114.70' RT 2462.50' TOP OF POND

G 8+19.58 133.49' RT 2462.50' TOP OF POND

H 8+10.78 138.62' RT 2462.50' TOP OF POND

I 8+03.00 142.19' RT 2462.50' TOP OF POND

J 7+73.13 117.29' RT 2462.50' TOP OF POND

K 7+59.93 106.25' RT 2462.50 TOP OF POND

L 7+38.66 87.01' RT 2465.50' TOP OF POND

M 7+61.56 91.45' RT 2459.50 BOTTOM OF POND

N 7+67.22 88.39' RT 2459.50 BOTTOM OF POND

O 7+77.31 82.95' RT 2459.50 BOTTOM OF POND

P 8+02.91 81.14' RT 2459.50 BOTTOM OF POND

Q 8+24.82 90.75' RT 2459.50 BOTTOM OF POND

R 8+17.39 109.13' RT 2459.50 BOTTOM OF POND

S 8+09.22 125.72' RT 2459.50 BOTTOM OF POND

T 7+76.74 106.18' RT 2459.50 BOTTOM OF POND

U 7+86.63 96.28' RT 2459.50 BOTTOM OF POND

V 7+72.98 101.30' RT 2459.50 BOTTOM OF POND

W 8+07.36 110.25' RT 2459.50 BOTTOM OF POND

A L

B

C Q

E

F

R

S H

J

KM

N

O

U

P V

W

T

D

G

I sgose Text Box Basin 1701 - Plan View sgose Text Box Attachment A - Munger Rd Bridge