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Home / DOT Specifications / Pennsylvania / Publication 408 — Specifications / 214
Earthwork (200-299)

214SEALING ABANDONED WATER WELLS AND SPRINGS

PA · 2026 Standard SpecificationsBook pages 193–197View official source ↗

222.1 222.3(c) 222 – 1

222.1DESCRIPTION —This work is the construction of a geocell load distribution mat over soft or unstable

subgrades.

222.2M ATERIAL —

(a)Geocell. Section 737 of the depth and type indicated.
(b)Anchors. Section 709.1(a), Grade 40. Used to hold expanded geocell sections in a fully and

uniformly extended position until backfilling of geocell is complete. Provide anchors in accordance with the manufacturer ’s recommendations and as indicated, except having a minimum bar diameter of 0.375 inches and a minimum length of 12 inches plus the geocell depth.

(c)Mechanical Fasteners. Used to fasten adjacent sections of geocell. Provide mechanical fasteners

in accordance with the manufacturer ’s recommendations and capable of holding adjacent geocell panels in direct contact until pavement or other type of final surface is placed.

(d)Coarse Aggregate. Section 703.2, No. 2A.
(e)Geotextile. Section 735.1, Class 4, Type A.

222.3CONSTRUCTION —Install the geocell according to manufacturer’s instructions and as follows:

(a)Subgrade Preparation. Prepare compacted subgrade to a unif orm surface and to the lines and

grade in dicated.

(b)Geotextile. Install geotextile on prepared subgrade. Provide a minimum 12 inch overlap between

adjacent layers and extend a minimum of 6 inches beyond the indicated perimeter of the installed geocell.

(c)Geocell. Store and transport geocell sections in an unexpanded configuration until ready to install.

Position collapsed geocell sections in place and drive in the anchors starting at the outer edge cells. Drive anchors as required by the manufacture r or as required to fully expand a geocell panel to the required cell dimensions and to hold it in place until filling with subbase is complete. Drive anchors so that the anchor extends at least 12 inches below the bottom of the geocell. Allow enough anchor length above the top of the geocell for the anchor to be removed. Remove anchors after filling the cel ls with subbase and before compaction when used for subgrade support and pavement applications. In situations where it is not practical to use anchors (i.e. over soft soil containing obstructions to driving anchors, existing shallow utilities, etc.) an ins tallation frame may be needed to allow for the expansion of the geocells without anchoring in place. The installation frame must be capable of fully expanding the geocells and holding them in place until the subbase is pl aced in the cells. Align adjoining geocell sections and overlap abutting perimeter cell welded ends. Keep top of geocell sections flush before fastening. Connect adjacent geocell sections with mechanical fasteners, in accordance with the manufacturer’s recommendations. M echanical fasteners must be capable of holding adjacent

Source: Pennsylvania Department of Transportation Specifications, 2026 Edition. Pages 193–197 of 1,522.
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