CAHA_326609A_SOW_Q1443_REV_-_8_28_24_0002.pdf

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443 Page 1

CAPE HATTERAS NATIONAL SEASHORE

Fort Raleigh

Manteo, North Carolina

STATEMENT OF WORK: REV 8/28/2024

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443

NATIONAL PARK SERVICE

Region 2

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443 Page 2

CAPE HATTERAS NATIONAL SEASHORE

Outer Banks Group

Statement of Work

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443

1.0 INTRODUCTION

The National Park Service (NPS) Cape Hatteras National Seashore (CAHA) has a requirement to replace the septic tank and drain field at Quarters 1443 on Fort Raleigh National Historic Site

(FORA).

2.0 CONSTRUCTION SITE LOCATION

The address for the project site is 1443 Pear Pad Rd Manteo, NC 29754.

3.0 BACKGROUND AND EXISTING CONDITIONS

The quarters at 1443 Pear Pad Rd in Manteo, NC is a 3 bedroom, single family house. The existing wastewater system consists of a tank approximately 750 gal and drainfield measuring approximately 40 ft wide and 50 ft long. The tank is located approx. 50 ft from the house. The drain line between the house and the tank is expected to be cast iron pipe in portions and PVC pipe in recently repaired sections. The drainfield in a traditional gravity system with gravel trench and perforated plastic pipe. The system is past its useful life, does not properly drain, and has been encroached by tree and other vegetation roots. Sewage is being pumped periodically from the septic tank to allow limited usage of the quarters.

The water service is on the east side of the house near Pear Pad Rd. The electrical and telecommunications services for the house are located on the west side behind the house and is buried below ground. The electrical distribution and service to the house are within the project site.

The site was examined according to North Carolina Administrative Code Title 15A Chapter 18

Environmental Health Subchapter 18E Sanitation - Sewage Treatment and Disposal Systems

(15A NCAC 18E). Specifically, the topography, landscape, soil characteristics, soil wetness condition and water table depth, soil depth and restrictive horizons, daily flow rate, and setbacks for the location of tank and drainfield.

Consultation with the Dare County Public Health On Site Water Protection Branch provided helpful information on the soil type in the Housing area as a Sandy Loan. A percolation test was not conducted on site due to the sandy nature of the soil. A maximum Long Term Acceptance

Rate of 0.8 is allowable for the drainfield sizing calculations, depending on the type of drainfield installed.

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443 Page 3

Figure 1: Vicinity map of housing along Pear Pad Rd on Fort Raleigh.

4.0 SCOPE OF WORK

Replace the septic system with a new septic system meeting the most current version of 15A

NCAC Subchapter 18E and International Building Code for North Carolina. A qualified installer with a State approved license shall install the new system.

1. Task 1: Submit Product Data for materials to be used on this project.

2. Task 2: Locate and mark existing utilities within the limits of construction and access route including at a minimum:

a. Electrical

b. Communications

c. Septic

3. Task 3: Demo existing septic system

a. Demo 750 gal concrete septic tank and distribution tank.

b. Demo majority of the existing drainfield, roughly 5’ around the base of the 28” pine tree will remain and be abandoned in place , SEE ATTACHMENT

c. Cut and remove the existing drain line from the house to the septic tank approximately 31 ft from the house (see attached drawings). Avoid the underground electric line.

d. Protect existing drainline for reconnection to the new tank.

4. Completely remove five existing full size trees (approx 40-80 ft tall) as shown on the attachment. One additional 28” diameter pine tree will not be removed. Removal of trees includes the stumps and roots extending into the new drainfield location. Roots

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443 Page 4 from other trees which are identified on the attached sketch to remain but which extend into the footprint of the drainfield shall be cut within the perimeter of the proposed drainfield.

5. Install construction fence around the project site and tree protection fence around existing trees within the project area which are to remain after work is complete. Tree protection fence shall be installed at the drip line of the branches.

6. Provide new 1,000 gallon concrete septic tank. Locate new tank approximately 31 ft from the house. (See attached sketch of proposed layout of new drainfield).

a. Connect the existing drain line from the house to the new septic tank with waterproof connection.

b. Provide properly sealed joints and connections from the existing drain pipes to new sections of pipe which seal to the new septic tank. Use schedule 40 PVC or approved equal material.

7. The new 1,000 gal septic tank include at a minimum:

a. Water tight joints

b. Concrete baffles

c. Effluent filter

d. Access opening less than 18 inches from the end of the tank to visually see the inflow pipe.

e. Adequate opening less than 12 inches from the effluent filter to be able to visually see and physically reach the effluent filter without entering the tank.

f. Access opening to visually see the concrete baffle.

g. Provide Concrete lids on the concrete septic tank with type 316 stainless steel handles.

h. HDPE risers and riser lids which extend a minimum of 12 inches above grade.

Riser lids shall be locking or mechanically sealed.

8. Provide new distribution tank and infiltrator drainfield. Drainfield shall be a minimum of

150 LF of new drain lines.

a. Remove roots within the drainfield trench footprint. Roots larger than 1 inch in diameter shall be pulled back to 5 ft away from the trench and cut and removed.

b. Remove unsuitable soil from new trenches (approximately 10 cy). Unsuitable soil may be reused to backfill existing tank excavation, or spread on site to smooth out ruts. Replace unsuitable soil with new suitable soil within the drainfield trenches.

c. Provide 36 in wide infiltrator type septic drainfield sections similar to Infiltrator

Water Technologies Quick4 Equalizer 36 which provide a minimum overall length of 150 LF of infiltration drain lines. Low profile sections with lower capacity are not acceptable.

d. Install chambers according to manufacturer’s installation instructions. Provide filter cloth above infiltrator sections according to the manufacturer’s instructions for the brand name utilized.

9. Provide seeding to the disturbed area, including demolished drainfield, new drainfield, and ruts or other disturbance created by construction. Continue to water the grass until

75% of the area has seeded and growing.

i. Seed shall be suitable for the following:

1. Mostly shade location

2. Residential lawn

3. Mowing operations with hand operated push or riding mowers

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443 Page 5

4. Sandy soils

5. Septic Field coverage (roots that do not grow deeper than 24 inches)

6. No weeds (dandelion, bahai, pennywort)

7. No exotic species.

ii. Broadcast or Hydroseed. Add a cover crop of grain rye at 30 lbs/acre.

Rake broadcasted seed mix into the soil and saturate with water 2 – 3 times per day for 7 days, or until 75% of the area has seeds germinated and growing at least 1 inch high. Hydroseeded area may be observed for 7 days or until 75% of the area has growing seeds. If after 7 days, the area is less than 75% covered with new growth, overseed again and water 2-3 times per day until 75% of the ground is covered with growth.

NOTES:

1. The Contractor is responsible for marking all utilities in the affected area of ground disturbance for the project. The contractor will be responsible for repair or replacement of any damage to marked and unmarked utilities.

2. The Contractor must track demolition debris which are removed/recycled and provide NPS with receipts showing the weight and volume and type of material removed/recycled as part of this project.

3. No construction debris will be allowed to be left on premises. All public areas will remain clean and passible during normal business hours. During business hours, the contractor will ensure that no music is playing in the work areas and no foul language will be tolerated during or after business hours. Work on this project will be accomplished within the hours of 7:00 AM to 5:00 PM Monday thru Friday.

5.0 GOVERNMENT FURNISHED PROPERTY

1. No Government property, materials, or equipment will be provided. Water and electricity on the exterior of the existing house is available for Contractor use during this project. Contractor is responsible for lockout/tagout. Contractor is responsible for cleaning up site daily, and for repairing ruts created in grass areas.

Ruts shall be filled in or raked smooth before final acceptance of the project.

6.0 SUBMITTALS

1. Work schedule: delineating the various stages of work by phase (milestones) prior to the preconstruction conference.

2. Safety Plan/Accident Prevention Plan prior to the preconstruction conference.

3. Product Samples. The Contractor shall submit written documentation or color/product samples for materials identified in the Scope of Work.

3.1 Qualification information for Installer.

Replace Septic Tank and Drainfield at Ft Raleigh Quarters 1443 Page 6

3.2 Septic Tank product data

3.3 Septic Drain Field Infiltrator product data

3.4 Manhole/Riser data

3.5 Seed Mix

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DISCONNECT EXISTING

SEPTIC DRAIN LINE

APPROX 31 FT FROM

HOUSE

REMOVE 16" Ø OAK

SCALE:

EXISTING FORT RALEIGH Q1443 SEPTIC SYSTEM2 1:100

SCALE:

PROPOSED FT RALEIGH Q1443 SEPTIC SYSTEM3 1:100

SCALE:

AERIAL PHOTO FORT RALEIGH Q14431 1:400

EXISTING TREE DRIP

LINE

Q1443

DEMO PORTION

OF DRAINLINE

AND EXISTING 750

GAL SEPTIC TANK

6" Ø TREES TO

REMAIN

CLUSTER OF

6 TREES TO

REMAIN

EXISTING HVAC

HEAT PUMP TO

REMAIN

PROVIDE 1000 GAL SEPTIC TANK AND

DISTRIBUTION BOX. LOCATE NEW TANK, DBOX,

AND DRAINFIELD TO AVOID THE UNDERGROUND

ELECTRICAL

CONNECT EX

DRAINLINE TO NEW

SEPTIC TANK APPROX

31 FT FROM THE HOUSE

0 10 20 40 60 100

GRAPHIC SCALE

REMOVE 10" Ø

HOLLY

Q1443

ABANDON IN PLACE THIS PORTION OF

EXISTING DRAINFIELD.

PROVIDE THREE TRENCHES 50 FT

LONG, 3 FT WIDE, AND 9 FT ON CENTER

Q1443

DEMOLITION NOTES:

1. PRIOR TO DIGGING, LOCATE EXISTING UTILITIES

IN THE PROJECT AREA.

2. DIG UP AND TURN SOIL IN THE NEW DRAINFIELD

AREAS, REMOVING ALL ROOTS OR UNSUITABLE

SOIL.

3. CAREFULLY EXCAVATE SOIL OR HAND DIG TO

AVOID DAMAGE TO THE EXISTING ELECTRIC,

WATER, SEPTIC, AND COMMUNICATIONS LINES.

4. DO NOT TRAVERSE OVER UTILITY LINES WITH

HEAVY MACHINERY OR VEHICLES WHICH

WOULD DAMAGE EXISTING UTILITY LINES

WITHOUT SPREADER PLATES.

5. TREE REMOVALS INCLUDE THE TAP ROOT,

STUMP, AND ROOTS TO AT LEAST 5 FT OUTSIDE

THE EDGE OF THE NEW DRAINFIELD.

INSTALLATION NOTES:

1. INSTALL NEW SEPTIC DRAINLINES WITH POSITIVE SLOPE

TOWARD SEPTIC TANK (MINIMUM 18 INCH PER FOOT),

DISTRIBUTION BOX, AND DRAINFIELD TRENCHES. DO NOT

INSTALL DRAINLINES AT 0 PERCENT OR UPHILL SLOPE. SET

TANK, DISTRIBUTION BOX, AND TRENCHES AT ELEVATION TO

ENSURE DOWNHILL SLOPE OF ALL DRAINLINES.

2. SANITARY TEE CONNECTIONS SHALL NOT BE PERMITTED FOR

HORIZONTAL TO HORIZONTAL PIPE FITTING CONNECTIONS.

3. BACKFILL, RAKE SMOOTH, AND GRADE RUTS, EXCAVATIONS,

AND DISTURBANCE PRIOR TO SEEDING.

TOTAL NEW DISTURBANCE: 1,800 SF

TOTAL AREA WITHIN LOC: 3,200 SF

TREES TO BE REMOVED: FIVE

LIMITS OF CONSTRUCTION

3' -0

28" Ø PINE TO REMAIN. CUT

ROOTS BELOW GROUND

WHICH EXTEND INTO THE

NEW DRAINFIELD

REMOVE 14" Ø OAK

REMOVE 15" Ø OAK

14"Ø OAK TO REMAIN

6" Ø OAK WITH

VINES TO REMAIN

18"Ø PINE TO REMAIN

8"Ø MAGNOLIA TO REMAIN

23" & 16" Ø TREES

TO REMAIN

8" Ø DOGWOOD

TO REMAIN

PAIR OF 10" Ø

OAKS TO REMAIN

16"Ø HOLLY

TO REMAIN

REMOVE 10" Ø HOLLY

9' -0

50'-0"

THREE 4" Ø

DOGWOOD

TREES TO

REMAIN

TWO 5" Ø

DOGWOOD

TREES TO

REMAIN

DEMO APPROX 90% OF EXISTING DRAINFIELD

PROTECT EXISTING TREE

TRUNK AND ROOTS AT

LEAST 5 FT AROUND THE

TREE.

001 REVISION 001 8/28/24

REVISION 001 SHOWN IN

REVISION CLOUD: REV 001

REV 001

REV 001

AutoCAD SHX Text Sheet

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REPLACE SEPTIC SYSTEM

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AT FT RALEIGH HOUSING

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1443 PEAR PAD ROAD

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MANTEO, NC 27954

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PMIS 326609

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AutoCAD SHX Text C1