DSHW-2024-007574

20231730.001A/SLC24L170232 Page 1 of 1 July 18, 2024
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Salt Lake Valley Solid Waste Management Facility
Module 5 Leachate Riser Abandonment
Construction Quality Control / Construction Quality Assurance Plan

Introduction

This document is intended to document the procedures that will be utilized for quality control and quality assurance during the
Salt Lake Valley Solid Waste Management Facility (SLVSWMF, or Site) Module 5 leachate riser abandonment activities.

Materials

• Three quarter-inch washed rock will be sourced by the contractor and used to fill the void space inside the inner riser,
and the annular space between the inner and outer risers.
• A geotextile filter fabric (Mirafi N-series or equivalent) will be used to cover the surface of the riser and the rock used
to fill the void spaces.
• Fine grained soils (primarily silt and clay) will be used to cover the riser and geotextile. The SLVSWMF will provide soil
on-Site for the contractor to use.

Riser Removal

The 36-inch outer and 24-inch inner high-density polyethylene (HDPE) risers shall be cut using mechanical methods flush with
the surrounding ground surface. The cut riser materials shall be removed from the immediate area of the abandonment
activities and disposed of at a location specified by the SLVSWMF.

Material Placement

After the inner and outer risers have been removed, the contractor shall place the ¾-inch rock into the inner riser in
approximately 12-inch lifts. The ¾-inch rock will also be placed in the annular space between the inner and outer risers in
approximately 6-inch lifts. Following each lift, the contractor shall measure the depth to the rock at each of the cardinal
directions to verify that bridging of the rock has not occurred. If bridging is evident, the contractor shall clear the blockage to
eliminate the bridged material before resuming placement of the next lift.

Once the riser pipes have been filled with rock, the contractor will prepare the ground surface surrounding the riser for
placement of the geotextile over the risers. Sharp rocks, trash, and other debris shall be removed from the ground surface. The
engineer’s approval of the prepared surface must be obtained prior to placement of the geotextile.

Next, the geotextile filter fabric shall be placed over the risers, extending at least three feet beyond the risers in each cardinal
direction. The geotextile filter fabric will be inspected and if found to be torn or otherwise damaged, the damaged material will
be removed and replaced. Stakes will be driven through each of the four corners of the geotextile filter fabric to prevent
shifting during the remainder of the construction activities.

Following placement of the geotextile, the contractor shall place two-feet of clay over the geotextile in eight-inch lifts. The
contractor shall place the clay material using a method that prevents damage or displacement of the geotextile filter fabric.
Each lift shall be wheel compacted. The clay shall extend past the geotextile and be graded to match the surrounding ground
surface.

Compaction

No formal compaction testing is required for the soil placed over the geotextile.