B08_Attachment_2_SOW_CHCU_335678_Repairs_to_Lagoon_Liners.pdf
PDF 1 MB Posted
- Attached to
- CYCLIC REPLACEMENT OF LAGOON LINERS
- Solicitation number
- 140P1325Q0050
About this file
This Scope of Work (SOW) details the repair of wastewater lagoon liners at Chaco Culture National Historical Park in New Mexico. The project involves replacing the 45 mil reinforced polypropylene (RPP) geomembrane liner on the south-facing berms and corners of the southeast and northeast lagoon cells, with an estimated liner replacement area of 13,750 square feet. The work includes digging new anchor trenches, installing vents, and relaying geocomposite vent strips.
The project stems from damage caused by a 2024 windstorm and subsequent UV degradation, with the objective of restoring lagoon capacity until complete liner replacement. Specific tasks include site verification, wastewater transfer between cells, cleaning existing liner surfaces, and precise liner installation techniques. Performance requirements specify work between 8 am-5 pm on weekdays, with onsite work limited to 30 calendar days. The construction delivery date is set for 60 calendar days after the Notice to Proceed, with the government expecting to issue the notice 30 calendar days after award.
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Other files
| File | Type | Posted |
|---|---|---|
| Sol_140P1325Q0050_Amd_0001.pdf | ||
| Sol_140P1325Q0050.pdf | ||
| B08_Attachment_1_DOL_WD_NM20250040_SanJuan_Hvy_1_24_2025.pdf |
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Text version
Scope of Work (SOW)
Repair Lagoon Liners
Chaco Culture National Historical Park
PMIS 335678
Table of Contents
1.0 Project Description / Summary
2.0 Objectives
3.0 Background
4.0 Specific Work / Tasks
5.0 Submittals
6.0 Place of Performance
7.0 Performance Period / Schedule Requirements
System Pictures
Scope of Work Task Order / Project Title: Repair Lagoon Liners
Park / Park Unit: Chaco Culture National Historical Park
Date: February 21, 2025
1.0 PROJECT DESCRIPTION / SUMMARY:
This project consists of repairing the southeast and northeast cells of the wastewater lagoons.
See highlighted area of attached plan set 310/106386A and pictures.
Repairs consist of replacing the 45 mil reinforced polypropylene (RPP) geomembrane liner on the south facing berms and corners. Estimated area of liner to be replaced is 13,750 square feet.
Work will include digging a new anchor trench, vents, and relaying necessary sections of geocomposite vent strips.
2.0 OBJECTIVES:
This project is intended to restore the capacity of the lagoons until the liners are completely replaced.
3.0 BACKGROUND:
During 2024, a windstorm tore the liner on the southeast cell. During a January 2025 inspection, damages were found on the northeast cell. It appears the south facing portions of the liner have suffered UV degradation. The remaining sections of the liner are in good condition.
4.0 SPECIFIC WORK / TASKS:
a. Contractor to visit site to verify existing conditions before submitting bid. Contractor shall account for any changes that may have occurred between writing this scope of work and construction.
b. Transfer wastewater between cells to allow for the lining process.
c. Move sludge and clean existing liner in areas where new liner will be welded to the existing liner.
d. New liner will be 45 mil RPP.
e. Contract Line Item 1: South East Cell Remove damaged liner. Remove any rocks that could damage new liner. Dig new anchor trench. Attach and weld new liner at the bottom of the cell and past corners, to undamaged areas on existing liner. Relay geo-composite strip vents, install new vents in liner, and anchor new liner and geocomposite strips in new anchor trench.
f. Contract Line Item 2: North East Cell Remove any rocks that could damage new liner.
Excavate and expose undamaged liner in anchor trench. Attach new liner at the bottom of the cell, past corners, and undamaged liner in anchor trench. New liner will be installed over damaged liner. Install vents in new liner.
g. Dispose of removed liner and any construction refuse.
5.0 LINER SPECIFICATION AND SUBMITTALS:
a. Submit manufacturer’s information and sample for proposed liner material.
The geo membrane liner shall be industrial grade reinforced polypropylene manufactured from 100% virgin raw materials that are specifically compounded for use in hydraulic structures. It shall possess the following properties.
45 mil, reinforced polypropylene liner as manufactured by Carlisle Syntec Systems or approved equal.
Physical Property Test Method Property Of Unaged Sheet Property After Aging 30 days
Tolerance on nominal thickness, % ASTM D 5199 ± 10
Thickness over scrim, in. (mm) 36-mil 45-mil 60-mil
ASTM D 4637
Optical Method
0.010 (0.254) min.
0.013 (0.330) min.
0.018 (0.457) min.
Mass per unit area, lb/ft2 (g/ ft2) (kg/m2) 36-mil 45-mil 60-mil
ASTM D 5261
0.17 (77) (0.83) typical
0.21 (95) (1.03) typical
0.29 (132) (1.42) typical
Breaking strength, lbf (kN) (grab tensile at strain rate of 12 in./min.)
36-mil 45 & 60-mil
ASTM D 751
Grab Method A
200 (0.9) min. 260 typ.
250 (1.1) min. 300 typ.
200 (0.9) min. 260 typ.
250 (1.1) min. 300 typ.
Elongation at break of fabric, % ASTM D 751 25 typical 25 typical
Tearing strength, lbf (N) (2 in. / min. strain rate) 36-mil 45 & 60-mil
ASTM D 5884
(max. load)
80 (356) min. 130 (578) typ.
100(445) min. 160 (712) typ.
Low temperature flexibility, °F (°C) ASTM D 2136 1/8 in.
mandre l 4 hour temp
- 40 (- 40) max.
- 50 (- 46) typical
Linear Dimensional Change (shrinkage), % ASTM D 1204 +/- 1.0 max.
- 0.5 typical
Ozone resistance, 100 pphm, 168 hours ASTM D 1149 No cracks No cracks Resistance to water (distilled) absorption After 30 days immersion 122 °F (50 °C) Change in mass, %
ASTM D 471
(coating compound)
1.0 max.
0.5 typical
Hydrostatic resistance, lbf/in.2 or psi (MPa) (Mullen burst) 36-mil 45-mil 60-mil
ASTM D 751
Procedure A
350 (2.4) min.
400 (2.8) typical 450 (3.1) typical 500 (3.4) typical
350 (2.4) min.
400 (2.8) typical 450 (3.1) typical 500 (3.4) typical
Field seam strength, lbf/in. (kN/m) Seam tested in peel after weld
ASTM D 4437
1 in. wide
30 (5.3) min.
60 (10.5) typical
Water vapor permeance, Perms ASTM E 96 0.10 max.
0.05 typical
Puncture resistance, lbf (N) 36-mil & 45-mil 60-mil
ASTM D 4833
(index puncture)
85 (378) min.
110 (489) typical 120 (534) typical
Resistance to xenon-arc weathering1
Xenon-Arc, 15,120 kJ/m2 total radiant exposure, visual condition at 10X
ASTM G 155
0.70 W/m2 80 °C
B.P.T.
No cracks No loss of breaking or tearing strength
6.0 PLACE OF PERFORMANCE:
a. The project is located at Chaco Culture National Historical Park in northern New Mexico.
More information and directions can be found at https://www.nps.gov/chcu/index.htm
b. The wastewater lagoons are located on a mesa (bluff) above the headquarters area.
Coordinates are 36.035229, -107.902455.
c. Access to the site is by a dirt road which may be impassable for two-wheel drive vehicles during rainy or snowy weather.
d. Access to the site is difficult for 18-wheel tractor trailer trucks.
7.0 PERFORMANCE PERIOD / SCHEDULE REQUIREMENTS:
a. Work shall be performed between the hours of 8 am -5 pm on weekdays. Extended, weekend, and holiday work may be allowed as approved by park facility manager with at least one weeks’ notice.
b. Onsite work will be limited to 30 calendar days.
c. Construction Delivery Date is 60-calendar days after Notice to Proceed - the government expects to issue the Notice to proceed 30-calendar days after award.
Site Pictures
South East Cell
North East Cell
CAWalker Polygonal Line
CAWalker Polygonal Line
CAWalker Callout Repair liner in these areas per directions in scope of work.
CAWalker Line
| The geo membrane liner shall be industrial grade reinforced polypropylene manufactured from 100% virgin raw materials that are specifically compounded for use in hydraulic structures. It shall possess the following properties. |
| 45 mil, reinforced polypropylene liner as manufactured by Carlisle Syntec Systems or approved equal. |
File details come from the government source that posted it. Updated .