SOR_FY_24_Ocracoke_and_Buxton_Sand_Stockpile.pdf

Provide Sandy Clay Material Page 1

CAPE HATTERAS NATIONAL SEASHORE

Outer Banks Group

Statement of Requirements

Provide Sandy Clay Material

1.0 INTRODUCTION

The National Park Service (NPS) Outer Banks Group (OBG) has a requirement for construction materials to be provided at two sites on Ocracoke Island, Cape Hatteras National Seashore. This statement of requirements includes the specifications for the material to be provided.

2.0 CONSTRUCTION SITE LOCATIONS

The site locations:

1) Ocracoke North end ferry bulk material storage yard

a. 35.189489 N -75.783677 W

2) Buxton - Parking area between Cape Point CG and South beach Road (back of Cape

Point Campground) See Figure 2.

a. 35 o 14’06.73” N, 75 o 32’37.52” W

3.0 BACKGROUND AND EXISTING CONDITIONS

The NPS maintains vehicle access ways to the National Seashore using sand for the surface.

Sand, per the instructions of the North Carolina Coastal Area Management Agency (CAMA) is used for repairs and maintenance to the access ways. NC Highway 12 runs from Bodie Island south to Ocracoke Island. The NPS has sand ramps at various locations along Highway 12. The north end of Ocracoke Island includes a stock pile area for dredge material and other materials including Sand, Clay, and Shell. The NPS utilizes the Sand, Clay, and Shell to maintain the access ramps as off road driving paths. The sand and clay must be of a content that is conducive to road building, hardpack base construction, and surface material. Sand material which includes approximately 10% - 20% clay has been found to endure off road vehicle traffic much better than sandy soils containing no fines, as well as sandy soils with silt. Silty sand has a low dry material strength, becomes mucky during rain events, and ruts /potholes quickly. Clayey sand material is material which has greater than 20% clay and often times has 50% clay, nodules or clumps of clay intermittent within the sand. Material with 30% or more clay can become slick when wetted, hardens when dry to a compact surface or subgrade, and has higher dry strength than silty sands.

Provide Sandy Clay Material Page 2

Figure 1 shows the location at the north end of Ocracoke Island where materials can be stored.

The material storage area is utilized by the state of North Carolina for dredge material storage, as well as the NPS for various types of material storage. The access road into the storage area includes some soft sand as well as compacted unpaved material.

Most Off Road Vehicle (ORV) sand ramps and access routes are accessible only be four wheel drive passenger vehicles or heavy construction equipment suitable for off road purposes.

Figure 1: Material Storage site at the north end of Ocracoke Island

4.0 MATERIAL REQUIREMENTS

The contractor will provide all technical support, materials, tools, equipment, and manpower required to provide the NPS with the following:

BASE BID:

Task 1: Provide product data (Gradation/Sieve Analysis) and sample submittal for sandy clay material to be provided. The product data must be for the actual material intended to be provided and for material taken from the same quarry/location.

1) Sandy clay material meeting must meet the following specifications:

a. The sand must be obtained from a source considered to be local to the Outer

Banks. Local material is considered to be material having zero content of

Provide Sandy Clay Material Page 3 invasive species of plants, or any organic material. Topsoil will not be accepted.

High silt content will not be accepted. Waste Dredge material will not be acceptable. Unsuitable material will be rejected and removed by the vendor at the vendor’s expense and will not be dumped on site.

b. The vendor supplying the sand is responsible for obtaining test results of the content of the material. The test results must be submitted to the NPS prior to delivery. Test results must be performed by an independent lab. The test requirement is for one sample per supply location if more than one vendor is used.

The soil analysis must show the particle distribution including at a minimum:

i. Sieve size

ii. Percent passing each sieve.

iii. Total percent gravel/coarse grains

iv. Total percent sand

v. Total percent silt

vi. Total percent clay

vii. Soil group classification

c. Sand must be a medium grade/ building or fine sand material meeting that meets the following gradation:

Sand Gradation

Sieve Size Percent Passing

#4 95-100

#8 85-100

#10

#16 50-85

#30 25-60

#40

#50 5-30

#60

#80

#100 10-20

#200* 10-20

% Silt Content 0 - 5

% Clay Content 10 - 15

Silt material is undesirable, 10% -20% clay material is required in the sandy clay material. A higher content of Clay material than 20% may be submitted for approval by the NPS.

The NPS reserves the right to take samples of any or all deliveries to be tested for consistency and material distribution. The NPS reserves the right to withhold payment for any delivery that does not meet expectations as agreed upon between the NPS and contractor providing the material. If the material is deemed inadequate the NPS may reject the delivery and the contractor must provide additional material until the full amount of acceptable material is received. The contractor may obtain additional samples and test above the required number at his own expense to verify overall consistency of the deliveries.

Provide Sandy Clay Material Page 4

Provide the following at the locations listed. The Contractor must meet the requirements and deliverables. Take special note of the additional requirements below – receipts showing weights/volumes must be provided to the NPS and a copy kept for the Contractor’s records.

Task 2: Provide the volume of material at the following locations:

1) Ocracoke North end ferry bulk material storage yard

• 2000 cubic yards of sand

• Material shall be delivered in vehicles (4 wheel drive or equivalent) which can exit the paved surface and dump sand material in the stockpile location.

OPTION 1:

Task 3: Provide the volume of material at the following locations:

1) Buxton Parking Area at Cape Point Campground

• 1,950 cubic yards of sand

ADDITIONAL REQUIREMENTS:

1) The vendor will be required to call the NPS point of contact (POC) for exact location on the day of delivery. The NPS POC will be available to escort delivery trucks to the point of delivery.

2) The Contractor must abide by the conditions listed in the Deliverables.

3) The Contractor is responsible for all drivers and vehicles used for deliveries. These sites are considered off road and may require backing, turning, dumping, etc. on or near unpaved areas. The Contractor is responsible for verifying existing conditions prior to and at time of delivery.

4) The Contractor is required for scheduling deliveries to meet ferry routes to and from

Ocracoke Island. Contractor vehicles are authorized to utilize the priority lane for ferry routes between Hatteras Island and Ocracoke Island.

5) Each vehicle/truck providing a delivery must also provide a receipt showing the materials being delivered to include volume, weight, dimensions, etc.

6) The Contractor must keep his own record/receipts of delivery in order to request payment. Accumulated totals of each type of material must be provided to the POC prior to submitting an invoice for payment.

5.0 DELIVERABLES

The Contractor will be required to submit electronic copies of testing reports to the NPS prior to starting delivery.

Provide Sandy Clay Material Page 5

Delivery of material on site will only be accepted from 7:00 am through 3:30 pm Monday through Friday. Other arrangements must be requested in writing through the Contracting

Officer and may be accommodated depending upon the location and request. Due to the high volume of expected deliveries, and Ocracoke Ferry schedule, the contractor will be required to contact the POC to assure proper receipt of the materials at the delivery location.

The contractor is highly encouraged to contact the POC prior to shipment to gain an understanding of the vicinity of the delivery sites. Vehicles which can perform the required turn-around, such as tandem dump truck, may be advantageous.