Original source · versioned page text
Installation Guide - Load Support _v2021.3a
PRS NEOLOY® TOUGH-CELLS
INSTALLATION GUIDE
Load Support,
Pavement
Applications
PRS-EN-TD-LS-3000
Version 2021 Revision 3 INSTALLATION GUIDE
Purpose of this Document:
This guide describes the procedures for installing Neoloy® Tough-Cells in structural load support pavement
applications, including roads, rails, ports, airports, embankments, platforms, storage yards.
See the original
The page text is free to read. Viewing or downloading an original file needs an account.
Log in to see the originalLog in to download the original (Installation Guide - Load Support _v2021.3a.pdf)
Searchable page text hides email addresses. Original files are unchanged and may show email addresses.
Full text of the other 20 pages
Page 2
Contents ① Key Points Before Starting ② Safety ③ Required Tools ④ Site Preparation ⑤ Anchor Stakes ⑥ Layout Sections ⑦ Fasten Sections ⑧ Open Sections ⑨ Infill ⑩ Compaction ⑩ Curves ⑩ Replacement ⑪ Appendix: Pre-Installation Checklist PRS-EN-TD-LS-3000 2/21 Ver. 2021.3
Page 3
Key Points Before Starting – Do’s & Don’ts
Confirm that site is cleared, ready for installation
Site Preparation DO: Verify specified Neoloy Tough-Cells are onsite
Make sure you have approved final design and construction plans
DON’T: DO NOT verify conditions onsite without visual confirmation
Fill out Required tools checklist – verify all equipment onsite and
Required Tools DO: ready for use
DON’T: DO NOT begin installation until all equipment is onsite
Training DO: Make sure installation team receives training from supervisor
DON’T: DO NOT install Tough-Cells without training
Mark route with rope
Layout DO: Anchor stakes equally spaced along road/rail right of way
(every 49 / 52 cm depending on cell size)
DON’T: DO NOT skip any stakes
Use the correct number of staples per panel
Fastening DO: (1 staple / 2.54 cm of cell height, e.g., 5 staples in 12 cm height cell)
DON’T: DO NOT use less than the required number of staples
Opening Sections DO: Verify that cells are aligned in the correct direction
DON’T: DO NOT walk or drive vehicles on empty cells
Confirm specified infill soil is as specified in design
Install on dry subgrade only to achieve optimal moisture
Verify that infill soil (with high percentage of fines/cohesive) is dry;
Infill Placement DO: In rainy weather, cover infill materials with tarps, covers
Verify that all cells overfilled by 7 cm before grading/compaction
Remove large rocks or debris
DON’T: DO NOT infill wet soil – may cause project failure
Verify full compaction for each layer according to specifications –
Compaction DO: full compaction is critical to project success
Verify that all cells overfilled by at least 2 cm after compaction
DON’T: DO NOT compact wet soil – may cause project failure
Safety & Adhere to safety standards and procedures
DO: Adhere to environmental protection guidelines
Environment
DON’T: DO NOT deviate from safety and environmental procedures
PRS-EN-TD-LS-3000 3/21 Ver. 2021.3
Page 4
Safety
Adhere to all applicable standard construction work safety procedures associated with site construction, power tools
and construction vehicles (e.g., EU Directive 92/571and US OSHA standards2).
Site Preparation Procedures
1) Preplanning excavation work – consider all possible jobsite conditions and consult with the appropriate
authorities about traffic, nearby structures, soil, water supplies, underground utilities and weather – that may be
reasonably expected prior to excavation.
Traffic control signs, signals, barricades or devices
1) Safety Standards – The use of appropriate traffic signs, signals and barricades where installation takes place near
public roadways is mandatory to protect workers and equipment, as well as the vehicular traffic itself.
Personal Protective Equipment
1) Personal protective equipment – installers should wear reflective vests and protective gear for on-site safety
including: helmets, work shoes, gloves, and safety glasses where applicable.
Power Tools and Air Supply
1) Equipment – operate pneumatic tools, compressor and generator according to the manufacturer’s instructions,
and only if properly trained in its use and alerted to its potential hazards.
2) Eye protection – all members of installation team operating with or in proximity to power tools should wear safety
glasses with side protection that conform to industry standards.
3) Air supply and connections – shall be secured to the hose in a positive manner to prevent accidental
disconnection. Never use oxygen or other bottled gases for air supply. Do not exceed the PSIG indicated on the
tool label. Disconnect when making adjustments or when not in use.
4) Operation of power tools (e.g., pneumatic stapler) – care must be taken during fastening, particularly to hands
and fingers to avoid serious personal injury.
NOTE: Make sure to disconnect the air supply to the compressor when adding staples to the pneumatic stapler –
accidental discharge may cause serious personal injury.
Vehicles and Mechanized Equipment
1) Make sure that personnel are in the clear before driving in reverse, dumping, shoveling or lifting.
2) Do not drive directly on empty Tough-Cells.
Fill, Cover and Paved Layers
1) Employees and vehicle operators will be properly trained in the use of concrete pouring equipment and asphalt
paving equipment if applicable, and alerted to potential hazards of the process, vehicles and fumes.
1 EU Council Directive 92/57/EEC of 24 June 1992 on the implementation of minimum safety and health requirements at temporary
or mobile construction sites, http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31992L0057:EN:HTML
2 US Occupational Safety & Health Administration (OSHA) Regulation 1926, Safety and Health Regulations for Construction,
http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10593
PRS-EN-TD-LS-3000 4/21 Ver. 2021.3
Page 5
Overview
This guide describes the procedures for installing PRS Neoloy® Tough-Cells (formerly known as PRS-Neoweb) in load
support - pavement applications. The following are the basic stages:
• Tools and handling
• Site preparation
• Layout sections
• Fasten sections
• Anchor stakes
• Expand sections
• Infill
• Special situations
FIGURE 1. TYPICAL INSTALLATION
Key Points before Starting
1. Materials – ensure that all specified materials and the correct Neoloy Tough-Cell type/width are delivered to the
site, undamaged, and ready for use.
2. Tools – verify that you have the appropriate materials and required tools – such as, anchors, pneumatic stapler
(and staples), air compressor and electricity source; geogrids and geotextiles as specified.
3. Plans – make sure that you have approved project construction plans and specifications.
4. Layout – when laying out the Neoloy strips, make sure the sections and cell openings are in the direction,
alignment and elevation as shown on the construction drawings.
5. Empty cells – do not walk on exposed cells. Although the cell walls are stiff, Neoloy Tough-Cells are a composite
system that works only when infilled with soil. Walking on empty cells may bend the cell walls and damage the
performance of the system. Use boards and planks to walk over empty cells if necessary.
6. Vehicles – vehicles may not be operated directly on exposed Neoloy Tough-Cells at any time; during the infill
process make sure that the Neoloy Tough-Cells are not damaged by mechanical equipment.
7. Safety – ensure that employees are familiar with and adhere to safety standards and procedures.
8. Environment – if natural stream environments are involved, minimize environmental impacts of construction
activities on fish habitat, sediment, pollutants and bank vegetation, in accordance with relevant guidelines.
Typical Applications
The following are typical load support applications relevant
to this installation guide:
▪ Asphalt pavements
▪ Unpaved gravel roads
▪ Railways
▪ Ports
▪ Airports
▪ Embankments
▪ Platforms
▪ Storage yards
FIGURE 2. TYPICAL PAVEMENT INSTALLATION
PRS-EN-TD-LS-3000 5/21 Ver. 2021.3
Page 6
Required Tools and Equipment
Palletized Neoloy Sections Stakes – iron, wood, other material
& Neo-clip™ (optional)
Pneumatic Stapler Air Compressor and Generator
& 1/2" (13 mm) Galvanized Staples (60 psi /4 bar pressure) & Pneumatic
Hammer with Head (optional)
Additional Geosynthetics
a) Geotextiles (if specified in the project design)
b) Geogrids (if specified in the project design)
Standard Construction Tools
c) Hand Tools – shovels, rakes, sledge hammers and nails, utility knives
d) Lumber – long planks and/or rectangular boards used for walking over empty cells
Mechanical Construction Equipment
a) Front-end loaders with buckets for the infill process, although excavators or dozers may be used.
b) Compaction equipment includes rammers, vibratory plates and rollers.
c) Water trucks and graders according to need.
PRS-EN-TD-LS-3000 6/21 Ver. 2021.3
Page 7
Storage and Handling
Dimensions and Weights
Neoloy Tough-Cell sections are folded, shrink-wrapped and palletized for delivery to the site. The following table
provides typical dimensions and weights of the palletized sections. The amount and size of the sections and cells varies
according to Neoloy type and height.
TABLE 1. MINIMUM AND MAXIMUM WEIGHTS AND DIMENSIONS OF PALLETIZED NEOLOY SECTIONS
Minimum Pallet Size Maximum Pallet Size Minimum Pallet Maximum Pallet
Length x Width x Height Length x Width x Height Weight Weight
100 x 100 x 100 cm 112 x 110 x 115 cm 420 kg 615 kg
Transport and Storage
1. Take care that protective wrapping, labels and the Neoloy Tough-
Cell sections are undamaged during transport, handling and
storage.
2. If the Neoloy Tough-Cells are to be stored on or off site for an
extended amount of time, make sure the palletized sections are
protected from UV radiation (sunlight), chemicals, fire or welding
sparks), high temperatures and damage from people or
equipment.
Off-loading Sections On-site
FIGURE 3. PALLETED SECTIONS
Slings and fork attachments can be utilized to off-load palletized sections
on-site. After removing wrapping, individual sections can be lifted and
carried by one individual.
1. Ensure that all specified materials are delivered to the site,
undamaged, and ready for use.
FIGURE 4. OFF-LOADING SECTIONS ON-SITE
PRS-EN-TD-LS-3000 7/21 Ver. 2021.3
Page 8
Site Preparation
Prepare Subgrade Layer
Prepare subgrade per construction drawings or Engineer.
1. PREPARE SITE AND SUBGRADE.
a) Clear and grub vegetative cover, debris, stumps, roots.
b) Replace unacceptable foundation soils if specified.
2. COMPLETE EARTHWORK.
a) Level surface to planned elevations and grades.
b) Compact subgrade according to specifications.
FIGURE 5. PREPARE SUBGRADE LAYER
Layout Geotextile / Geogrid (if specified)
1. Install geosynthetic layers according to the manufacturer’s
directions.
2. Ensure required overlap between rolls or pre-sewn seams
according to project specification.
Anchor Stakes
Anchor Stakes along Route FIGURE 6. LAYOUT GEOTEXTILE
NOTE: Take care not to damage underground
infrastructure such as geomembranes, cables or pipes.
Stakes or pins are used to position and anchor the outer cells of
the Neoloy sections prior to infill. Use pointed wood, iron or
steel j-hooks according to the subbase hardness.
1. Anchor the stakes firmly in the ground.
a) Geotextiles (if applicable) – penetrate the geotextile
fabric with the stakes; or if a non-permeable
geomembrane is used, anchor the stakes on the sides.
b) Intervals – typical spacing between stakes is ~50 cm
when fully opened; depending on the cell size, project
specifications, or on-site Engineer.
FIGURE 7. INSERTING STAKES/ANCHORS ALONG ROUTE
c) Marking - string or chalk line may be used to align
staking locations and borders.
NOTE: Leave at least 10 cm of the stakes exposed as they will be removed before compaction and paving.
PRS-EN-TD-LS-3000 8/21 Ver. 2021.3
Page 9
Layout Neoloy Tough-Cell Sections on Site
Direction of the Tough-Cells
1. The closed section “length” is to be aligned in the direction of the road course.
2. The section will be opened (expanded) across the road width.
FIGURE 8. LAYOUT & DIRECTION OF SECTIONS & CELLS
3. The result will be a fully expanded section with the cells at the nominal recommended openings. For example, the
typical fully expanded section dimensions of PRS-330 are ~2.5m “long” by ~8m “wide”.
NOTE: In some load support applications, the “length” may be laid out across the road width (perpendicular)
and the cells expanded in the direction of the road course.
Layout Sections
1. Disperse sections along road course.
a) Calculate the open section size and the road width
and length
b) Disperse the folded (closed) sections along the road
course in series (on top of the installed geotextile) to
facilitate connecting one to another.
c) Cut section width (or length) as necessary.
NOTE: Save cut sections to be used elsewhere or to be
disposed of properly at end of project.
FIGURE 9. LAYOUT SECTIONS ALONG ROAD LENGTH
PRS-EN-TD-LS-3000 9/21 Ver. 2021.3
Page 10
Fasten Neoloy Tough-Cell Sections
Sections are fastened in series before opening and expanding the cells. The ends of adjoining sections are typically
fastened the length of their long dimension (when closed), while the face (walls) of adjoining sections are fastened
together typically across the road in the direction of the cell expansion.
CAUTION: It is recommended that 2 people perform the fastening. Observe all safety precautions when using
the pneumatic stapler to prevent serious injury to hands and body.
Use the Correct Number of Staples
1. Fasten using the number of staples required by the cell
height (see Figure 10 ):
< PRS 075 mm – 3 staples (minimum)
< PRS 100 mm – 4 staples
< PRS 120 mm – 4 staples
< PRS 150 mm – 5 staples
< PRS 200 mm – 6 staples
NOTES: Correct positioning of the top and bottom
staples is critical. Use ½ inch (13 mm) galvanized staples.
Verify that staples penetrate all strips and/or seams. FIGURE 10. STAPLES FASTENING SECTIONS
END TO END– PRS 150 MM
Staple Sections End to End (Figure 12)
1) Fasten each end of the 2 sections:
a) The staples must penetrate the seams (2 strips) on
each section (total of 4 strips).
2) Align and interleaf the ends of adjoining sections.
a) Overlap the end seams of the two adjoining sections
by 3 cm and ensure that their surfaces are flush.
3) Fasten the edges of adjoining sections at the seams using
the pneumatic stapler.
a) Overlap the end seams of the two adjoining sections
by 3 cm and ensure that their surfaces are flush. FIGURE 11. FASTENING END TO END
b) Make the overlap uniform for the entire section.
Fasten Sections Face to Face (Figure 12)
1. Align 2 adjacent sections face to face (the “long” sides).
a) The ends and perforations (if exist) should be aligned.
2. Continue fastening the sections by stapling the middle of
each cell (unperforated area) along the entire length of
the strip until completed.
NOTE: Each cell (seam) must be fastened properly –
do not skip any cells, as this may cause failure of the
entire section.
FIGURE 12. FASTENING SECTIONS FACE TO FACE
PRS-EN-TD-LS-3000 10/21 Ver. 2021.3
Page 11
Expand Neoloy Tough-Cell Sections
Expand Sections over Anchors
1. Place the outer cells of the joined sections over the anchors on one side of the road.
2. Open and expand the sections to the opposite side and “hook” over the anchors (stakes).
3. Verify that the expanded sections are flush on the ground and opened to their nominal dimensions (see Figure and
Table below).
NOTE: Do not walk on empty cells as this may bend the cell walls and damage the system.
Spread planks or boards over the empty cells to walk over the Neoloy Tough-Cell sections if necessary.
FIGURE 13. CELL DIMENSIONS/DIRECTION
FIGURE 14. EXPANDING SECTIONS OVER ANCHORS
TABLE 2. NOMINAL DIMENSIONS OF CELLS & THEIR OPENING APERTURE
CELL & SECTION NOMINAL DIMENSIONS
CELL PROPERTIES DESCRIPTION SECTION PROPERTIES DESCRIPTION
Cell Distance between 330 mm (±2.5%) No. of Cells/m2 40
Weld Seams
Cell Wall Heights 65, 75, 100, 120, 125, 150 Section Size (Expanded) 2.50 x 8.00 m (±3%)
mm
Cell Dimension (Expanded) 250 x 210 mm (±3%) Section Area (Expanded) 20 m2
PRS-EN-TD-LS-3000 11/21 Ver. 2021.3
Page 12
Expand Neoloy Tough-Cell Sections (cont.)
Optional Use of Stretcher Frames
Frames can be used for extreme climatic and soil conditions.
1. Expand the section over the dowels of the dimensioned
stretcher frame.
2. Invert the fame.
3. Fill with infill and repeat for next section.
FIGURE 15. USE OF STRETCHER FRAMES
Curved Sections
Neoloy Tough-Cells can be easily adapted to moderate curves by varying the degree of cell expansion.
1. Vary the cell dimensions by over-expanding the outer cells
and under-expanding the inner cells.
2. Cell expansion may be according to the long axis (road
direction) or perpendicular to the road axis.
NOTE: Under or over expanded cell size on curves must
not exceed 15% of nominal cell dimensions.
FIGURE 16. INSTALLING SECTIONS ON CURVES
PRS-EN-TD-LS-3000 12/21 Ver. 2021.3
Page 13
Infill Placement
Before Operating Vehicles on the Cells
1. Before construction vehicles go over Neoloy Tough-Cells,
ensure the following:
a) Minimum overfill (above cell) of 7 cm is required.
b) Verify that the outside border cells are completely
covered with infill.
c) Minimize turning, avoid sudden braking and limit
speed to less than 15 km/h.
d) No vehicle (or pavement layer) is permitted over
exposed cells.
FIGURE 17. SPREADING INFILL
Place Infill
1. Mechanically (or manually if necessary) infill the first
(outer) rows of the expanded sections using the
designated granular fill material according to the
construction plans.
NOTE: Limit drop height of infill to 1m (100 cm) to
prevent damage to the cell walls.
2. Overfill the Neoloy Tough-Cells to at least 7 cm above the
cell walls.
a) This is to allow for settling before trafficking or
compacting.
FIGURE 18. INFILL PLACEMENT
3. Continue infilling in the direction of the road.
a) Use the loader blade (back of shovel) to compact the infill.
NOTE: Visually inspect infill and remove any large pieces of debris, soil or rock – larger than one cell – to
prevent damage to the cell walls.
4. Manually spread the infill if necessary, to ensure uniform infill and that no cell walls are exposed. Do not walk on
empty cells. Use planks or boards to walk over empty cells.
5. After infill is complete, remove stakes/anchors before compacting.
a) Stakes/anchors may be reused.
PRS-EN-TD-LS-3000 13/21 Ver. 2021.3
Page 14
Grading and Compaction
Grading and Compaction
Grading and compaction should be carried out according to
standard procedures and in full compliance with the project
specifications. The following are key points.
NOTE: Full compaction is critical to the performance of
the Neoloy load support mechanism. Do not use heavier
compaction equipment than is necessary, as this may
cause “waves” in the surface that prevent full
compaction.
1. Before Starting:
a) To ensure full compaction, determine the correct
type of equipment before starting the project.
b) Verify that there are no large pieces of debris, soil or FIGURE 19. GRADING
rock that may damage cells.
2. If total fill layers exceed 20 cm, compact separately
(depending upon the type of infill, site and application):
a) First compact Neoloy infill layer.
b) Then compact cover layer.
3. Do not leave any Neoloy Tough-Cell wall exposed. Verify
that overfill is at least 2 cm above cell height after
compaction.
4. Water spray trucks may be used to suppress dust, if
required.
5. Shape compacted surface to required elevation and grade FIGURE 20. COMPACTION
with conventional graders and compactors.
PRS-EN-TD-LS-3000 14/21 Ver. 2021.3
Page 15
Installation on Curves
Curved Sections
Neoloy Tough-Cells can be easily adapted to moderate
curves by varying the degree of cell expansion.
3. Vary the cell dimensions by over-expanding the
outer cells and under-expanding the inner cells.
NOTE: Under or over expanded cell size on
curves must not exceed 15% of nominal cell
dimensions (see Table 2). If exceeding this value,
use tapered trapezoidal sections as below.
Tapered Trapezoidal Sections
A series of trapezoidal sections are the preferred method for covering wide curves or right angles.
1. Expand one section downslope at the beginning of the curve on the curve.
2. Expand the next adjacent section downslope and lift it over the previous section so that it overlaps and part of it
lies on top of the previous section.
3. Cut only the part of the overlapping section on top diagonally using a utility knife.
4. Align the walls of the 2 adjacent sections and fasten together.
5. Repeat this procedure to make sufficient tapered sections to cover the entire radius of the curve.
FIGURE 21. TAPERED EXPANSION OF SECTIONS ON CURVE
NOTE: Save cut sections to be reused or disposed of properly at end of project.
PRS-EN-TD-LS-3000 15/21 Ver. 2021.3
Page 16
Replacing Sections
Replacing Damaged Cells & Sections
Should the need arise a localized Neoloy section or group of cells can be easily replaced.
1. Remove cover layers, overfill and infill materials so that the localized to-be-cut area is fully exposed and can be
removed and replaced.
2. Cut out the localized cells in the perimeter using a utility knife (preferably in a rectangular shape), leaving a border
of undamaged cells on each of the four sides.
3. Place a new Neoloy section over the ‘hole’ of cut area – it must
be larger to enable strip overlapping at the perimeter. Make sure
the section is in the same orientation and open it fully, so that
the cells expand to their optimal size (see Table A-1 below).
4. Cut the new replacement section exactly to the required size
including overlapping, using the utility knife.
5. Position the replacement section into place and anchor the walls
and ends if necessary, so that the cells are opened fully (see
Table A-1 below). Overlap the strips with the perimeter of the cut
area. FIGURE A-22. REPLACING DAMAGED SECTIONS
NOTE: All cells in the replacement section must be fully open for the system to function properly.
6. Fasten the new replacement with the existing Neoloy mattress. Make sure to use sufficient staples:
• < PRS 075 mm – 3 staples (minimum)
• < PRS 100 mm – 4 staples
• < PRS 120 mm – 4 staples
• < PRS 150 mm – 5 staples
• < PRS 200 mm – 6 staples
Note that the replacement will be fastened to the adjoining undamaged section on 4 sides:
end to end of adjacent ‘strips’ as well as face to face along the cell walls of the adjacent sections.
TABLE A-3. CELL OTPIMAL OPENING SIZE
Distance
330 mm 356 mm 445 mm 660 mm 712 mm
between ±2.5%
(13 in) (14 in) (17.5 in) (26 in) (28 in)
Weld Seams
Cell Dimension 245 x 210 mm 260 x 224 mm 340 x 290 mm 490 x 421 mm 520 x 448 mm
±3%
(Optimal opening) (9.65 x 8.27 in) (10.24 x 8.82 in) (13.39 x 11.42 in) (19.29 x 16.53 in) (20.40 x 17.64 in)
7. Fill the new replacement section using the same of one grade higher quality infill material than the removed infill
material.
8. Compact to required levels of density.
NOTE: Full compaction of the replacement section is required for the system to function properly.
PRS-EN-TD-LS-3000 16/21 Ver. 2021.3
Page 17
Appendix: Neoloy Tough-Cells: Pre-Installation
Site Preparation –Mandatory Items Checklist
No. Description Responsibility Images Required Status
Client PRS
Preinstallation - General
1 Leveling, Drying and compaction ✓
of installation area
2 Preparing site for installation ✓
according to plan
3 Design approval ✓
4 Filling material: quantity, quality ✓
(strength), and grading according
to design requirements
5 Confirmation of laboratory results ✓
6 Installation Supervision ✓
7 Delivery and reading installation ✓ ✓
guide
8 Installation Team ✓
9 Supply of geotextile fabrics ✓
10 Monitoring and supervision ✓ ✓
11 Ready-for-installation tools: ✓
PRS-EN-TD-LS-3000 17/21 Ver. 2021.3
Page 18
Installation Equipment
12 Pneumatic staple guns ✓
13 Staples for staple guns ✓
14 Compressor (2 hp) + compatible ✓
generator + adequate fuel
15 Air-pressure hose suited for 2 hp / ✓
4.5 Bar
16 Fastening device for geotextile ✓
fabrics
PRS-EN-TD-LS-3000 18/21 Ver. 2021.3
Page 19
17 Installation anchors ✓
(wood / iron)
18 Marking rope ✓
19 Hammers - ✓
Minimum weight 2 kg
20 Safety equipment ✓ Shall be provided in
accordance with the
requirements of the site
supervision
PRS-EN-TD-LS-3000 19/21 Ver. 2021.3
Page 20
Heavy Engineering Equipment for Installation:
No. Description Responsibility Images Required Status
Client PRS
21 Dump trucks ✓
22 Front-end and/or Backhoe ✓
Loader/s
23 Road Grader/s ✓
24 Water Truck/s ✓
25 Compactor/s ✓
26 Excavator/s for infilling material in ✓
cells (slope and wall projects)
PRS-EN-TD-LS-3000 20/21 Ver. 2021.3
Page 21
Installation Manpower
No. Description QTY Responsibility Status
Client PRS
1 Site engineer ✓
2 Soil sampling tester ✓
3 Laboratory tester ✓
4 Installation supervisor ✓
5 Installation teams ✓
One team consists of 4 people
6 Project supervisor ✓
7 Surveyor ✓
8 QA/QC Tester ✓
PRS-EN-TD-LS-3000 21/21 Ver. 2021.3