{"id":13857,"date":"2026-10-24T11:02:47","date_gmt":"2026-10-24T07:32:47","guid":{"rendered":"https:\/\/www.pega.ir\/?p=13857"},"modified":"2026-10-24T11:08:19","modified_gmt":"2026-10-24T07:38:19","slug":"geomembrane-pond-subgrade-checklist","status":"publish","type":"post","link":"https:\/\/www.pega.ir\/?p=13857&lang=en","title":{"rendered":"Pond Subgrade Preparation and Handover Checklist Before Geomembrane Installation"},"content":{"rendered":"

Site handover guide | For contractors, inspectors and project owners<\/p>

Inspect and document subgrade preparation before deploying a geomembrane.<\/strong> The sheet does not correct unsuitable ground conditions. This checklist clarifies responsibilities, areas requiring correction and handover records. Compaction values, slopes, protection layers and drainage details must come from the approved project design.<\/p>

1. Check reference documents before mobilization<\/h2>

Provide the installation team with the latest plans, sections, product specifications and anchorage details. Record discrepancies between drawings and actual conditions before installation begins. A verbal change to slope or outlet location may change quantities, panel arrangements and the installation schedule. Identify the decision-maker and revised document number for every change.<\/p>

2. What should a surface inspection cover?<\/h2>

Prepare the surface beneath the sheet to project specifications and remove damaging materials. Mark sharp stones, roots, debris, voids, soft spots and local irregularities during inspection. Report standing water, machinery movement or erosion to the responsible technical specialist. Engineering assessment determines whether soil correction, protection layers or groundwater control measures are needed.<\/p>
Inspection subject<\/th>Required record or action<\/th><\/tr><\/thead>
Geometry and levels<\/td>Compare the final survey with drawings and record differences<\/td><\/tr>
Surface and materials<\/td>Record sharp objects, voids, unsuitable soil and corrective results<\/td><\/tr>
Subgrade compaction<\/td>Check test reports required by project specifications<\/td><\/tr>
Surface water and groundwater<\/td>Record observed conditions and approval of the specified solution<\/td><\/tr>
Perimeter anchorage<\/td>Check location and section against approved details<\/td><\/tr>
Inlets and outlets<\/td>Check structure positions and readiness of sealing details<\/td><\/tr><\/tbody><\/table>

3. A protection layer does not replace subgrade correction<\/h2>

If the design requires geotextile or another supplementary layer, check its type, condition and installation. A protection layer does not automatically make any subgrade acceptable. Resolve every nonconformity before covering the surface. Further articles on geotextiles and installation mistakes are available in the site archive.<\/p>

4. Check anchorage and pipe penetration readiness<\/h2>

Compare pipe penetrations, concrete connections and geometry transitions on drawings and on site. These locations need dedicated details. Do not determine anchor trench dimensions or sealing methods simply by copying another project. Record the detail drawing number and approver in the checklist so the installer has a clear basis.<\/p>

\"Geomembrane
Approve subgrade condition and traffic routes before deploying panels. Image from PEGA\u2019s media collection.<\/figcaption><\/figure>

5. Handover access and protection of the subgrade<\/h2>

After subgrade approval, identify traffic routes, roll unloading locations and machinery access limits. Reinspect if rainfall or other work takes place between handover and installation. Previous approval does not cover a changed surface condition. Coordinate the schedule so prepared areas are not left unprotected for an indefinite period.<\/p>