Addendum 1 – Legion Pond Dam RFP: P27-04, Town of Chapel Hill, NC 1 August 17, 2026

ADDENDUM 1

FOR

LEGION POND DAM

TOWN OF CHAPEL HILL, NORTH CAROLINA

BID: P27-04

TO: All Prospective Companies

FROM: Lenore Bishop, Purchasing & Contracts Manager

SUBJECT: Addendum 1 – Legion Pond Dam

DATE: August 17, 2026

This Addendum is being issued to provide additional information and answer the questions received from prospective Companies regarding the above-referenced Request for Bids. All other terms and conditions remain unchanged.

Modifications:

1. In Legion Pond Dam Project Manual; overall page 16 of 412; page 2 of 7 on the Bid Form for Construction Contract; Section 3.02 Unit Price Bids:

a. Remove and replace this sheet in its entirety with the new Unit Price Bid sheet attached as file [Bid Tab Update from PM_08.13.26].

2. In the Drawing Set – ZCP-25-36 Zoning Approved Plan:

a. Remove and replace with the attached new Bid Set Drawing pages the following Sheets:

Cover Sheet, ES101, CG102, and CD101. Attached as file [Modified Sheets From Drawings

– Bidding Revisions – 081326].

Questions:

Listed below are the questions received and the responses:

1. Is the contractor responsible for obtaining the E&SC and COC permits?

A. A Letter of Approval for coverage under NCG01 has been obtained by the Town. The Town will submit the required notice of intent and pay relevant fees for the final Certificate of Coverage.

RFP: P27-04, Town of Chapel Hill, NC 2 August 17, 2026

2. Are there any other permits the contractor needs to obtain and pay for on this project?

A. No.

3. Is NTP expected in November 2026 to comply with TOY restrictions for tree clearing, or can this be delayed to avoid construction through the winter?

A. Yes, NTP is expected by November.

4. Is this project being awarded as a lump sum or unit price contract?

A. The contract will be awarded on a Lump Sum basis with Allowances [See Project Manual, Article 12.01].

5. Are you requiring (3) bids before opening bids?

A. Yes. Three responsive sealed bids are required to be submitted before opening any bids, or the project may be re-bid at a later date.

6. Is there a concern that the 4-inch inlet orifice will get stopped up and create a flotation effect for the structure and outlet pipe?

A. No. A debris shield is specified for the 4-inch inlet orifice to reduce clogging. See CD102 Detail 3 for the debris shield to prevent clogging. In addition, a buoyancy analysis was performed during the design of the outlet riser system to account for clogging of riser orifice. Debris shields are not proposed for the remaining orifices on the OCS. A clarifying note has been added to Detail 1 on Sheet CD101.

7. Are all trees identified on Sheet #TS101 being removed completely? If so, the root mat on some of these is extensive and will cause significant damage when removed from locations where grading isn't taking place. What are the expectations for repairing the banks and other areas where grading isn't proposed, where cavities are left by stump removal?

A. Yes, all trees are to be removed along with their respective root balls as documented in the geotechnical report. A note has been added to Sheet CG102 under Dam Embankment Notes:

“THE EXISTING SLOPES ARE COVERED BY MATURE TREES. FOR SLOPE PREPARATION, TREES

SHOULD BE CUT, AND THE ENTIRE ROOT BALL SHOULD BE REMOVED FROM THE EXISTING

EMBANKMENT. EXCAVATE A MINIMUM 3-FOOT DEPTH INTO THE EXISTING EMBANKMENT

TO ACCOUNT FOR TREE ROOT BALL REMOVAL, BUT THE ROOT BALLS SHOULD BE REMOVED

SO THAT ALL ROOTS ONE-HALF INCH AND LARGER IN DIAMETER ARE REMOVED.

EXCAVATIONS MADE FOR REMOVAL OF TREES SHOULD FOLLOW EXCAVATION,

COMPACTION, AND BENCHING DETAILS.”

8. Regarding the fill of the existing pond basin up to the 300' contour elevation, will the existing bottom require any form of removal and disposal before placing fill? At what point in the sequence of construction is this fill dirt to be placed? Are we just spreading the fill over top of the muck? Please elaborate on fill placement requirements within the basin.

RFP: P27-04, Town of Chapel Hill, NC 3 August 17, 2026

A. Yes, muck and loose sediment should be removed from under the OCS and 24” barrel to a depth one foot (1’- 0") below existing ground surface or foundation subgrade, or to a firm and stable subgrade, whichever is deeper. Sheet CG102 has been updated to reflect this clarification. Fill may be placed directly over the existing pond bottom outside of these specific areas. The construction sequence on the Cover Sheet has been updated to provide information on when this is to occur.

9. Please confirm that precast structures can be used for the winged endwall and riser/intake structure.

A. Precast structures are allowed.

10. Please confirm that the contours on the face of the dam (west side) reflect finish grades, including the toe drain berm.

A. Grades shown on CG101 are final grades; see Toe Drain detail on CD105 for 3H:1V and 5H:1V sections.

11. Is on-site soil expected to be suitable for backfilling the 24" RCP? If not, will importing fill be addressed as a change order if needed, based on the geotech's reporting?

A. Based on the limited borings, it will likely meet requirements. However, the contractor should test the material to confirm it meets the specified requirements. We cannot guarantee that all excavated material (or a specific quantity) will be suitable. Additional information on the placement of fill within the embankment is provided under “Dam Embankment Notes” on sheet CG-102. In the event that in-situ soil from the site does not meet these requirements a change order may be necessary.

12. Can consideration be given to extending the construction period beyond 120 calendar days?

A. An extension of the construction period may be considered in the event of long lead times for construction materials or weather delays, not for means and methods reasoning in the schedule.

13. Can clarification be provided for the extent of perimeter fencing and the visibility fencing shown on Sheet ES101?

A. Tree protection fencing is to be installed around the entire perimeter of the project site per Town of Chapel Hill Building Department Regulations. A modified Sheet ES101 is provided in this addendum along with an updated bid tab which includes the updated quantity of this fence type. The fencing shall be erected prior to any demolition efforts beginning and shall be in place and maintained throughout the length of the project. Visibility fencing (shown on Sheet ES101 and in detail 8 on sheet CD104) is only proposed along Legion Rd.

Town of Chapel Hill, North Carolina Legion Pond Dam – Bid # P27-04

EJCDC® C-410, Bid Form for Construction Contract.

Copyright© 2018 National Society of Professional Engineers, American Council of Engineering Companies, and American Society of Civil Engineers. All rights reserved.

Lump Sum for Cash Allowance 1 $

Lump Sum for Cash Allowance 2 $

Lump Sum for Cash Allowance 3 $

Total for all Lump Sum for Cash Allowances $

3.02 Unit Price Bids

A. Bidder will perform the following Work at the indicated unit prices:

Item No. Spec. Section Description Unit Estimated

Quantity Bid Unit Price Bid Amount

Demolition, Dewatering and Erosion Control

1 NCDOT 1101 Work Zone Traffic Control LS 1 $ $

2 NCDOT 226 Grading for Comprehensive Grading LS 1 $ $

3 SS-2

Dewatering

Control and Monitoring of Dewatering Activities (Dewatering Pump)

LS 1 $ $

4 NCDOT 1607 Stone for Erosion Control, Class A (Gravel Construction Entrance) TN 27 $ $

5 NCDOT 1607 Geotextile for Drainage, Type 2 (Gravel Construction Entrance) SY 80 $ $

6 NCDOT 876 Rip Rap, Class B (Guide for Rip Rap at Pipe Outlets) TN 5 $ $

7 NCDOT 876 Geotextile for Drainage, Type 2 (Guide for Rip Rap at Pipe Outlets) SY 8 $ $

8 NCDOT 1605 Temporary Silt Fence LF 900 $ $

9 TOCH Detail -

EC-12.00

Orange, UV Resistant High Tensile Strength Polyethylene Laminar Barricade Fabric, Steel Posts, and a Sign for Tree Protection Fence

LF 2,900 $ $

10 NCDOT 1631

Matting for Erosion Control (Matting Blanket, Matting Installation)

SY 4,200 $ $

11 NCDOT 1660 Seeding and Mulching (Temporary Seed) AC 6.6 $ $

12 NCDOT 230 Borrow Excavation (Topsoil) CY 273 $ $

Bid Tab Update from PM - 8.13.2026

Addendum 1 – Legion Pond Dam RFP: P27-04, Town of Chapel Hill, NC August 17, 2026

Blake Cary Highlight www.tetratech.com

CLIENT INFORMATION:PROJECT LOCATION:

PROJECT DESCRIPTION / NOTES:

Tt PROJECT No.: CLIENT PROJECT No.:

ISSUED:

ENGINEERING, P.C.

Legion Pond Dam Alternative Selection Town of Chapel Hill, North Carolina

100% Progress Plans 1714 Legion Rd, Chapel Hill, NC 27517

100-WTR-T43655

To w n of

C ha pe l H ill

Town of Chapel Hill 6850 Millhouse Rd, Chapel Hill, NC 27516-8173 xx-xx-xx

4000 Sancar Way, Suite 135

Research Triangle Park, NC 27709

Phone: (919) 485-8278

6.87 TOTAL ACRES DISTURBED

FOR BIDDING:

JULY 13, 2026

VICINITY MAP:

NC License: C-2644

Call 811 Before You Dig SCALE: 1" = 500'

SHEET LIST TABLE

Sheet

Number Sheet Title SHEET DESCRIPTION

1 C101 COVER SHEET

2 G101 GENERAL NOTES

3 CX101 EXISTING CONDITIONS

4 DP101 DEMOLITION PLAN

5 ES101 EROSION AND SEDIMENT CONTROL PLAN

6 ES102 GROUND STABILIZATION AND MATERIALS HANDLING

7 ES103 INSPECTION, RECORDKEEPING, AND REPORTING

8 CG101 GRADING PLAN

9 CG102 GRADING SECTION AND STEEP SLOPE PLAN

10 CD101 CONSTRUCTION DETAILS - 1

11 CD102 CONSTRUCTION DETAILS - 2

12 CD103 CONSTRUCTION DETAILS - 3

13 CD104 CONSTRUCTION DETAILS - 4

14 CD105 CONSTRUCTION DETAILS - 5

15 TS101 TREE SURVEY

A PARCEL OWNED BY THE TOWN OF CHAPEL HILL LOCATED AT 1714 LEGION RD IN CHAPEL HILL, NORTH CAROLINA CONTAINS A 3-ACRE POND AND DAM, ORIGINALLY IMPLEMENTED AS A FARM POND MORE THAN 60 YEARS AGO, AS WELL AS THE FORMER HEADQUARTERS OF THE LOCAL CHAPTER OF THE AMERICAN LEGION. JURISDICTIONAL DETERMINATIONS BY NCDWR AND USACE HAVE BEEN CONDUCTED ON THE PROJECT SITE AND DETERMINED NO JURISDICTIONAL WATERS OR STREAM BUFFERS WITHIN THE PROPOSED AREA. THE PROJECT SITE DRAINS TO AN UNNAMED TRIBUTARY TO BOOKER CREEK (WS-V, NSW) WHICH FLOWS INTO THE JORDAN LAKE WATERSHED WHICH IS PART OF THE CAPE FEAR RIVER BASIN. THE TOWN SEEKS TO BREACH THE EXISTING POND EMBANKMENT AND REBUILD IN ITS PLACE A DETENTION BASIN WHICH PROVIDES SIMILAR STORMWATER PEAK FLOW MANAGEMENT

TO THAT WHICH THE EXISTING POND CURRENTLY PROVIDES.

PROJECT NARRATIVE

PROJECT AREA

1. OBTAIN NECESSARY PERMITS.

1.1. EROSION AND SEDIMENT CONTROL (E&SC) PERMIT AND A CERTIFICATE OF COVERAGE (COC) MUST BE OBTAINED BEFORE ANY LAND DISTURBING ACTIVITIES

(INCLUDING TIMBERING AND DEMOLITION) OCCUR. THE COC CAN BE OBTAINED BY FILLING OUT THE ELECTRONIC NOTICE OF INTENT (e-NOI) FORM AT https://www.deq.nc.gov/NCG01. PLEASE NOTE, THE e-NOI FORM MAY ONLY BE FILLED OUT ONCE THE PLANS HAVE BEEN APPROVED. A COPY OF THE E&SC PERMIT, THE COC, AND A HARD COPY OF THE PLAN MUST BE KEPT ON SITE, PREFERABLY IN A PERMITS BOX, AND ACCESSIBLE DURING INSPECTION.

2. CONTRACTOR SHALL BE RESPONSIBLE TO SCHEDULE PRE AND POST CONSTRUCTION STORMWATER INSPECTION.

3. SET UP PRE-CONSTRUCTION MEETING AT LEAST ONE WEEK BEFORE ANY CONSTRUCTION ACTIVITY BEGINS.

4. CONTRACTOR TO NOTIFY THE NORTH CAROLINA DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES (DEMLR) RALEIGH REGIONAL OFFICE AT LEAST 48 HOURS

PRIOR TO COMMENCING ANY LAND-DISTURBING ACTIVITY. THE CONTACT NUMBER IS (919) 791-4200.

5. HAVE THE PROJECT CLEARING LIMITS FLAGGED.

6. MOBILIZATION.

7. ERECT CONTRACTOR STAGING AREAS.

7.1. STOCKPILES, LAYDOWN OR WASTE AREAS, CONCRETE WASHOUTS, PORTABLE TOILETS, AND FUELS MUST BE LOCATED AT LEAST 50 FEET AWAY FROM ANY OPEN WATER CONVEYANCES, SUCH AS BASINS, DITCHES, STORM DRAIN INLETS, ETC. THE LOCATION OF THESE ACTIVITIES MAY BE FIELD ADJUSTED IF THE

DISTANCE REQUIREMENTS ARE MET.

8. INSTALL TREE PROTECTION, SILT FENCE, CONSTRUCTION ENTRANCE, AND ALL EROSION AND SEDIMENT CONTROL MEASURES AS INDICATED ON PLANS. LIMIT CLEARING AND LAND DISTURBING ACTIVITY TO ONLY THE AREA NECESSARY TO INSTALL PERMITTED MEASURES. ONLY MINIMAL CLEARING SHOULD BE PERFORMED

AS NEEDED TO INSTALL THE FENCING.

8.1. TAKE PRECAUTION TO AVOID CAUSING ROOT DAMAGE TO TREES JUST OUTSIDE OF THE CLEARING LIMITS. IF ROOT DAMAGE TO A TREE OUTSIDE OF THE CLEARING LIMITS IS UNAVOIDABLE, CONSULT WITH THE ENGINEER TO DETERMINE THE NEED TO REMOVE IT. THIS WILL BE CONSIDERED INCIDENTAL TO THE

LUMP SUM GRADING AND/OR CLEARING AND GRUBBING.

9. INSTALL PUMP IN POND AND STILLING BASIN ON NORTHERN SIDE OF ROAD.

10. DRAIN POND.

11. DEMOLISH SITE AS INDICATED ON PLANS.

12. INSTALL RISER STRUCTURE, TRASH RACK, AND OUTLET PIPE.

13. INSTALL BAFFLES AND SKIMMERS INSIDE SEDIMENT POND.

14. CONSTRUCT CONCRETE EMERGENCY SPILLWAY AND RIP RAP PROTECTION.

15. FILL DIRT TO BE PLACED AND PERFORM ROUGH GRADING OF THE SITE ONCE THE SITE IS DRAINED, DEMOLISHED, THE OCS IS INSTALLED, AND ALL EROSION

CONTROL MEASURES ARE INSTALLED.

16. MAINTAIN EROSION CONTROL MEASURES AS WORK PROGRESSES. ALL EROSION CONTROL MEASURES SHALL BE INSPECTED AND MAINTAINED, IF NEEDED, AT LEAST

ONCE PER WEEK AND AFTER EVERY QUALIFYING RAINFALL EVENT.

17. INSTALL TEMPORARY SEEDING IMMEDIATELY FOLLOWING ALL ROUGH GRADING.

18. STABILIZATION IS REQUIRED WITHIN 14 CALENDAR DAYS OF COMPLETION OF ANY GRADING OR INACTIVITY ON PROJECT SITE.

19. INSTALL ALL PROPOSED UTILITIES, STORM DRAINAGE, STRUCTURES, AND PIPES.

20. FINE GRADE REMAINING SITE.

21. INSTALL TEMPORARY SEEDING IN ALL DENUDED AREAS AS NEEDED IF PERMANENT SEEDING AND LANDSCAPING NOT READY TO BE INSTALLED.

22. SITE STABILIZATION IS REQUIRED PRIOR TO FINAL APPROVAL. GRASS UTILIZED AS PERMANENT GROUND COVER MUST BE AT A MOWABLE HEIGHT THAT GENERALLY

PROVIDES AT LEAST 80% COVERAGE THROUGHOUT THE SITE, WITH NO LARGE BARE PATCHES OR EVIDENCE OF EROSION.

23. INSTALL HARDSCAPE, INCLUDING SIDEWALK AND PAVING OPERATIONS (IF REQUIRED).

24. INSTALL LANDSCAPING.

25. CLEAN STORM SEWER PIPES, DROP INLETS, AND STORM STRUCTURES OF DEBRIS AND ERODED MATERIAL DURING THE LAST STAGES OF CONSTRUCTION.

26. ALL EXCAVATED MATERIAL SHALL BE DISPOSED OF IN A LAWFUL MANNER.

27. REMOVE TEMPORARY EQUIPMENT, CONSTRUCTION MATERIALS, AND DEBRIS FROM SITE.

28. AFTER SITE IS STABILIZED, REMOVE ALL TEMPORARY CONTROL MEASURES AND INSTALL PERMANENT VEGETATION ON ANY REMAINING DISTURBED AREAS. ALL

TEMPORARY EROSION AND SEDIMENT CONTROL MEASURES SHALL BE REMOVED WITHIN 30 DAYS OF FINAL STABILIZATION OR AS DIRECTED BY CIVIL INSPECTOR.

NO EROSION CONTROL MEASURES SHOULD BE REMOVED UNTIL THE SITE IS INSPECTED AND STABILIZATION IS CONFIRMED.

29. THE CONTRACTOR IS RESPONSIBLE FOR THE DISPOSAL OF ANY WASTE SOIL FROM THE PROJECT TO ANOTHER SITE INCLUDING APPROVED EROSION AND SEDIMENT

CONTROL. PLAN FOR THE DISPOSED MATERIAL.

30. CONTACT TOWN OF CHAPEL HILL TO SUBMIT INSPECTION REQUEST. CONTRACTOR SHALL BE RESPONSIBLE TO SCHEDULE A STORMWATER FINAL INSPECTION.

31. WHEN THE PROJECT IS COMPLETE AND PERMANENT STABILIZATION IS ACHIEVED, THE PERMITTEE SHALL CONTACT DEMLR TO CLOSE OUT THE E&SC PLAN. AFTER

DEMLR INFORMS THE PERMITTEE OF THE PROJECT CLOSE OUT, VIA INSPECTION REPORT, THE PERMITTEE SHALL VISIT https://www.deq.nc.gov/NCG01 TO SUBMIT AN ELECTRONIC NOTICE OF TERMINATION (E-NOT). A $127 ANNUAL GENERAL PERMIT FEE WILL BE CHARGED UNTIL THE E-NOT HAS BEEN FILLED OUT.

SEQUENCE OF CONSTRUCTION

USA USGS QUADRANGLE: CHAPEL HILL (35079-H1)

Modified Sheets From Drawings – Bidding Revisions – 081326

Addendum 1 – Legion Pond Dam RFP: P27-04, Town of Chapel Hill, NC August 17, 2026

BLAKE.CARY

Cloud

TOWN OF CHAPEL HILL

PIN: 9799467392

DB 6282-545

PARCEL 1

LIBERTY HEALTHCARE PROPERTIES OF

ORANGE COUNTY LLC

PIN:9799562741

DB 6013-204

PB 59-23

TOWN OF CHAPEL HILL

PIN: 9799555951

DB 6282-545

PARCEL 2

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300'

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305'

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LONGLEAF TRACE LLC

PIN: 9799456975

DB 6874/1448

SE/S AMERICAN

LEGION RD

P. & I.

CALINGAERT

PIN: 9799459807

DB 4381/259

PB 34-142

LOT 406

316'

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300'

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106+00106+33 xx xx xx xx xx xxxx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxxxxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxxxxxx xx xx xx xx xx xxxx xx xx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxxxxxxxx xx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxxxxxxxxxxxxxxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xxxx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx

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BAFFLES,

SEE DETAIL 5 ON SHEET CD104

(TYP.)

CONSTRUCTION ENTRANCE,

SEE DETAIL 1 ON SHEET CD103

STAGING AREA

RISER STRUCTURE,

SEE DETAIL 1 ON SHEET CD101

RIPRAP APRON,

L=8FT, W1: 4FT, W2:8FT

SEE DETAIL 2 ON SHEET CD103

REINFORCED CONCRETE

HEADWALL, SEE

DETAILS 6-7 ON SHEET CD102

130 LF 24" RCP,

UPSTREAM INVERT ELEV = 300'

DOWNSTREAM INVERT ELEV = 299.5'

SILT FENCE, SEE

DETAIL 1 ON SHEET CD104

TREE PROTECTION FENCE, SEE

DETAIL 4 ON SHEET CD104

DEWATERING BAG. ENSURE BAG DRAINS AWAY

FROM THE POND. SEE DETAIL 5 ON SHEET CD103

DEWATERING PUMP, MAX PUMP

RATE OF 1CFS OR 448GPM. POND

SHALL NOT DRAIN MORE THAN

ONE VERTICAL FOOT PER DAY

SILT FENCE, SEE DETAIL 1

AND 3 ON SHEET CD104

SKIMMER,

SEE DETAIL 6 ON SHEET CD104

TEMPORARY SEED AND

PERMANENT GRASS

ON ALL DISTURBED AREAS

MATTING BLANKET

ON ALL 3:1 SLOPES,

SEE DETAIL 2 CD104

SEWER LINE MUST REMAIN

ACCESSIBLE. NO EQUIPMENT OR

MATERIALS SHALL BE STAGED

WITHIN 15' OF SEWER MAIN.

ACCESS DRIVEWAY TO

REMAIN OPEN THROUGHOUT

CONSTRUCTION

LIMITED VISIBILITY FENCE

SEE DETAIL 8 ON SHEET CD104

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CONTOURS IN THIS AREA WERE DERIVED FROM THE 3DEP

USGS DEM AND ARE PROVIDED TO INDICATE

GENERAL TOPOGRAPHY. NO GRADING IS PROPOSED

WITHIN THIS AREA.

RAIN GAUGE AND PERMITS/RECORD

BOX LOCATION.

CONCRETE WASHOUT STRUCTURE,

SEE SHEET ES102.

SILT FENCE OUTLET EVERY 100 LF,

SEE DETAIL 3 ON SHEET CD104

SILT FENCE OUTLET, SEE

DETAIL 3 ON SHEET CD104

COMPOST FILTER SOCK,

SEE DETAIL 7 ON SHEET CD104

STEVEN FUNTE

PIN: 9799459784

DB 5607

PB 33-107

LOT 405

MEADOWS OF CHAPEL HILL

HOMEOWNERS ASSOC INC

PIN: 9799550548

DB 457-246

TOWN OF CHAPEL HILL

PIN: 9799555951

DB 6282-545

PARCEL 2

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305'

310'

315'

300'305'

310'

315'

305'

310'

315'

320'

320'

297'

P. & I.

CALINGAERT

PIN: 9799459807

DB 4381/259

PB 34-142

LOT 406

310'305' 300'

300'

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LOD LOD LOD

LEGEND

LIMIT OF DISTURBANCE

PROPOSED CONTOUR

EXISTING CONTOUR

EXISTING CONTOUR (USGS DEM)

SILT FENCE

TREE PROTECTION FENCE

PROPOSED STORM SEWER

SF

SD

N

1. CONTRACTOR SHALL MAINTAIN PUBLIC ACCESS TO THE LEGION BUILDING DURING ALL

PHASES OF CONSTRUCTION.

2. CONTOURS FROM THE UNITED STATES GEOLOGICAL SURVEY (USGS) 3D ELEVATION

PROGRAM (3DEP) PROVIDE EXISTING CONDITION GRADE BEYOND SURVEY LIMITS FOR

DE-WATERING PLACEMENT.

3. APPROVAL OF THIS EROSION AND SEDIMENTATION CONTROL PLAN DOES NOT AUTHORIZE

IMPACTS TO WETLANDS, COASTAL MARSH, STREAMS OR OTHER WATERS OF THE STATE OR

UNITED STATES OR SUPERSEDE ANY OTHER PERMITTING REQUIREMENT OF ANY FEDERAL,

STATE OR LOCAL AGENCY.

4. THE DEVELOPER IS RESPONSIBLE FOR THE CONTROL OF SEDIMENT ON-SITE. IF THE

APPROVED EROSION AND SEDIMENTATION CONTROL MEASURES PROVE INSUFFICIENT, THE

DEVELOPER MUST TAKE THOSE ADDITIONAL STEPS NECESSARY TO STOP SEDIMENT FROM

LEAVING THIS SITE.

5. CONCRETE WASHOUT FACILITIES SHOULD BE INSPECTED DAILY AND AFTER HEAVY RAINS TO

CHECK FOR LEAKS, IDENTIFY ANY DAMAGE CAUSED BY CONSTRUCTION ACTIVITIES, AND

DETERMINE WHETHER THEY ARE FILLED TO OVER 75 PERCENT CAPACITY. WHEN THE

WASHOUT CONTAINER IS FILLED TO OVER 75 PERCENT OF ITS CAPACITY, THE WASH WATER

SHOULD BE VACUUMED OFF OR ALLOWED TO EVAPORATE TO AVOID OVERFLOWS. WHEN

THE REMAINING CEMENTITIOUS SOLIDS HAVE HARDENED, THEY SHOULD BE REMOVED AND

RECYCLED. DAMAGES TO THE CONTAINER SHOULD BE REPAIRED PROMPTLY. BEFORE

HEAVY RAINS, THE WASHOUT CONTAINER’S LIQUID LEVEL SHOULD BE LOWERED, OR THE

CONTAINER SHOULD BE COVERED TO AVOID AN OVERFLOW DURING THE RAIN EVENT. SEE

SHEET ES102 FOR ADDITIONAL CONCRETE WASHOUT DETAILS.

NOTES

XX

COMPLETE PARCEL VIEW

0 0.5 1 2

SCALE: 1/16"=1'

N

Addendum 1 – Legion Pond Dam RFP: P27-04, Town of Chapel Hill, NC August 17, 2026

BLAKE.CARY

Cloud

Station

101+50 102+00 102+50

103+00 103+50

104+00

4'

7' x 7' x 1' ANTI-FLOTATION CONCRETE SLAB.

ELEV. TOP OF SLAB = 299.0'

TOP OF RISER

ELEV = 315'

TRASH RACK,

SEE DETAIL 1 ON SHEET CD102

BOTTOM OF BASIN

ELEV = 300'

SKIMMER, SEE DETAIL

6 ON SHEET CD104

CONSTRUCT ORIFICES THAT CAN

ACCOMODATE UP TO 6" DIAM. PIPE WITH

INVERT ELEVATIONS OF 310' AND 312' FOR

USE IN FUTURE RISER MODIFICATIONS.

TEMPORARILY PLUG OPENINGS.

4" DIAM. ORIFICE

INVERT ELEV = 300'

FILTER DIAPHRAGM,

TOP ELEV = 312'

BOTTOM ELEV =295.5'

SEE DETAIL 4 ON SHEET CD105

REINFORCED CONCRETE

HEADWALL, SEE DETAIL

5-6 ON SHEET CD102

EXCAVATE TO 1' BELOW FOOTING ELEVATION OR TO A FIRM

AND STABLE IN SITU SUBGRADE, WHICHEVER IS DEEPER, TO

BE APPROVED BY GEOTECHNICAL ENGINEER OR THEIR

REPRESENTATIVE, PLACE NCDOT 1016 CLASS III, TYPE 3

SELECT MATERIAL AND COMPACT 98% OF ASTM D698.

EXISTING SURFACE

PROPOSED SURFACE

3" TOPSOIL SEED MIX

12' UPPER LIMIT = 314.5'

LOWER

LIMIT = 308'

PERMANENT TURF

REINFORCEMENT

MAT (TRM)

3:1

CLASS V 24" RCP

OUTLET PIPE

INV OUT ELEV. = 300'

PROPOSED 5:1

SLOPE WITH TOE

DRAIN, SEE

DETAIL 1 ON

SHEET CD105

3:1

GROUT PAVED INVERT TO ALLOW

POSITIVE DRAINAGE WITHIN

RISER STRUCTURE

EMBANKMENT FILL

PROPOSED DETAILS

AROUND OUTLET PIPE,

SEE DETAIL 4 ON SHEET

CD105

ELEV = 316'

INSTALL GATE VALVE AT THE 4" ORIFICE

AS SHOWN IN DETAIL 2 OF CD102.

OUTLET RISER STRUCTURE,

SEE DETAIL 1 ON SHEET CD101.

EXCAVATE TO 1' BELOW EXISTING GROUND SURFACE OR TO A

FIRM AND STABLE IN SITU SUBGRADE, WHICHEVER IS DEEPER,

TO BE APPROVED BY GEOTECHNICAL ENGINEER OR THEIR

REPRESENTATIVE, PLACE NCDOT 1016 CLASS III, TYPE 3

SELECT MATERIAL AND COMPACT 98% OF ASTM D698.

TOWN OF CHAPEL HILL

PIN: 9799467392

DB 6282-545

PARCEL 1

TOWN OF CHAPEL HILL

PIN: 9799555951

DB 6282-545

PARCEL 2

UT

UT

UT

UT

OE

OE

OE

EDGE OF POND

EDGE O

F P

OND

EDGE OF POND

ED

G

E O

F PO

N D

300'

300'

305'

310'

315'

300'305'

310'

315'

305'

310'

315'

320'

320'

318'

297'

LONGLEAF TRACE LLC

PIN: 9799456975

DB 6874/1448

SE/S AMERICAN

LEGION RD

P. & I.

CALINGAERT

PIN: 9799459807

DB 4381/259

PB 34-142

LOT 406

316'

315'

314'

313'

312'

316'

315'

314'

313'

310'305' 300'

300'

LO

D

LO

D

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LO

D

LO

D

LO

D

LOD LOD

LOD

LOD

LOD

LOD

LOD

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LOD

LO

D

LO

D

LOD

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CG102

GRADING SECTION

DAM EMBANKMENT NOTES

A. PLACEMENT OF ANY FILL MATERIAL MUST BE CONDUCTED UNDER THE OBSERVATION OF A QUALIFIED LICENSED GEOTECHNICAL ENGINEER AND UPON COMPLETION OF THE EARTHWORK ACTIVITIES, THE TOWN OF CHAPEL HILL STORMWATER MANAGEMENT OFFICE MUST BE PROVIDED WITH A FINAL GRADING REPORT THAT INCLUDES THE CORRESPONDING COMPACTION TEST RESULTS

AND CERTIFIES THE TYPE OF FILL MATERIAL AND ITS PROPER PLACEMENT WITH AS-BUILT.

B. ALL FILL MATERIAL TO BE USED FOR THE DAM EMBANKMENT SHALL BE TAKEN FROM BORROW AREAS APPROVED BY THE ON-SITE GEOTECHNICAL ENGINEER. EMBANKMENT FILL IS USCS CLASSIFICATION OF CL (LEAN CLAY), ML (SILT), CL-ML (LEAN SILTY CLAY), SM (SILTY SAND), OR SC (CLAYEY SAND) WITH A MINIMUM OF 40 PERCENT FINES (LESS THAN #200 SIEVE). EMBANKMENT FILL MATERIAL SHALL BE CONSTRUCTED OF CLEAN STRUCTURAL SOIL, FREE OF ROOTS, STUMPS, WOODS, STONES GREATER THAN 2'' AND OTHER OBJECTIONABLE MATERIAL. EMBANKMENT FILL SHALL BE PLACED IN 6” LOOSE LAYERS (3” LOOSE LAYERS WITHIN 3' ON EITHER SIDE OF THE PRINCIPAL PIPE TO A DEPTH OF 2” OVER THE PIPE) COMPACT TO AT LEAST 98% STANDARD PROCTOR MAXIMUM DRY DENSITY WITHIN -1 TO +3 PERCENT OF OPTIMUM MOISTURE CONTENT. ALL COMPACTION IS TO BE DETERMINED BY

ASTM D698 (STANDARD PROCTOR)

C. ALL FILL MATERIAL TO BE USED FOR THE RISER STRUCTURE SHALL BE TAKEN FROM BORROW AREAS APPROVED BY THE ON-SITE GEOTECHNICAL ENGINEER. GRADATION MUST BE IN ACCORDANCE WITH NCDOT 1016 CLASS III, TYPE 3 SELECT MATERIAL. RISER FILL MATERIAL SHALL BE CONSTRUCTED OF CLEAN STRUCTURAL SOIL, FREE OF ROOTS, STUMPS, WOODS, STONES GREATER THAN 2'' AND OTHER OBJECTIONABLE MATERIAL. RISER FILL SHALL BE PLACED IN 6” LOOSE LAYERS (3” LOOSE LAYERS WITHIN 3' ON EITHER SIDE OF THE PRINCIPAL PIPE TO A DEPTH OF 2” OVER THE PIPE) COMPACT TO 98% OF STANDARD PROCTOR MAXIMUM DRY DENSITY WITHIN -1 TO +3 PERCENT OF OPTIMUM MOISTURE CONTENT. ALL COMPACTION IS TO BE DETERMINED BY ASTM

D698 (STANDARD PROCTOR).

D. THE GEOTECHNICAL ENGINEER SHALL OBSERVE AND CERTIFY ALL ASPECTS OF THE CONSTRUCTION OF THE EMBANKMENT (I.E., PREPARATION OF FOUNDATION, INSTALLATION OF THE CUT-OFF TRENCH, INSTALLATION OF PRINCIPAL SPILLWAY PIPE, INSTALLATION OF INTERNAL DRAINAGE, INSTALLATION OF COMPACTED FILL, ETC.). THE FREQUENCY OF OBSERVATION AND TESTING MUST BE SUFFICIENT FOR THE GEOTECHNICAL ENGINEER TO STATE IN HIS/HER OPINION, THAT THE SPECIFIC ITEMS OBSERVED AND TESTED WERE INSTALLED IN ACCORDANCE WITH THE APPROVED CONSTRUCTION DRAWINGS AND

SPECIFICATIONS.

E. LIFTS OF FILL SHOULD BE INTEGRATED (E.G., BENCHED OR KEYED) INTO ADJACENT SLOPES AND THE UNDERLYING LIFT OF FILL

(E.G. VIA SCARIFICATION OR ROUGHENING OF THE SURFACE).

F. THE EXISTING SLOPES ARE COVERED BY MATURE TREES. FOR SLOPE PREPARATION, TREES SHOULD BE CUT, AND THE ENTIRE ROOT BALL SHOULD BE REMOVED FROM THE EXISTING EMBANKMENT. EXCAVATE A MINIMUM 3-FOOT DEPTH INTO THE EXISTING EMBANKMENT TO ACCOUNT FOR TREE ROOT BALL REMOVAL, BUT THE ROOT BALLS SHOULD BE REMOVED SO THAT ALL ROOTS ONE-HALF INCH AND LARGER IN DIAMETER ARE REMOVED. EXCAVATIONS MADE FOR REMOVAL OF TREES SHOULD FOLLOW

EXCAVATION, COMPACTION, AND BENCHING DETAILS.

STEEP SLOPE SCHEDULE

EXISTING CONDITIONS

+25%: 2.22 ACRE

TO BE DISTURBED

0-10%: 0.18 ACRE

10-25%: 0.31 ACRE

+25%: 0.48 ACRE (22% OF EXISTING AREA GREATER THAN 25%)

GENERAL NOTES

1. HATCHES DRAWN IN THE STEEP SLOPE PLAN ARE NOT

EXACT AND WERE DRAWN FOR DISPLAY PURPOSES ONLY.

REGIONS DERIVED FROM EXISTING GRADE SURVEY.

SCALE: 1"=100'

STEEP SLOPE PLAN

N

0 50 100 200

STEEP SLOPE LEGEND

0-10% SLOPE

10-25% SLOPE

+25% SLOPE

Addendum 1 – Legion Pond Dam RFP: P27-04, Town of Chapel Hill, NC August 17, 2026 7

BLAKE.CARY

Cloud

4" DIAM. ORIFICE

INVERT ELEV = 300'

DESIGN NOTES:

1. SEE NCDOT DETAIL 840.45 ON CD101 FOR CONSTRUCTION STANDARDS, THE SOLID WALL CONFIGURATION.

2. INSTALL 0.5" X 12" HOT-DIP GALVANIZED J-BOLTS AT 8" SPACING THROUGHOUT INTERIOR OF RISER PLACEMENT. EMBED 6" IN TO

PROVIDE MINIMUM 6" SPACING FROM WALL OF RISER.

3. RISER STRUCTURE TO BE EQUIPPED WITH STEPS AS SHOWN IN NCDOT DETAIL 840.66 ON CD101.

4. DETAILS 1 (TRASH RACK), 2 (SLIDE GATE), AND 3 (DEBRIS SHIELD ON 4" ORIFICE) ON SHEET CD102 TO ADDITIONALLY BE FITTED

TO THE RISER STRUCTURE.

5. CONTRACTOR TO PROVIDE SHOP DRAWINGS OF RISER STRUCTURE FOR ENGINEER APPROVAL.

6. INSPECTION AND MAINTENANCE OF THE RISER STRUCTURE IS NECESSARY TO MAINTAIN PERFORMANCE.

4'-0"

24" RCP OUTLET PIPE

INV OUT ELEV. = 300'

5' x 5' PEDESTAL INLET

WITH TRASH RACK DETAIL

SEE DETAIL 1 ON CD102

6" REINFORCED

CONCRETE

315'

6" DIAM. ORIFICE

INVERT ELEV = 312'

2" DIAM. ORIFICE

INVERT ELEV = 310'

BOTTOM SECTION OF RISER

TO BE OPEN BOTTOMANTI-FLOTATION CONCRETE SLAB,

SEE NOTE 2

Checked By:

Drawn By:

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CD101

1 RISER STRUCTURE (NOT TO SCALE)

Addendum 1 – Legion Pond Dam RFP: P27-04, Town of Chapel Hill, NC August 17, 2026 8

BLAKE.CARY

Cloud