DSHW-2024-009457

Logan Landfill
Phase III
Final Cover Documentation

Section 1 – General Information
The Logan Landfill has served the municipal solid waste (MSW) and construction and demolition
(C&D) needs of Logan City since 1960 and all of Cache County since 1974. The landfill is
approximately 75 acres in size and is located approximately 2 miles west of Main Street in Logan
along Highway 30.
The Logan Landfill is being closed in several closure Phases which began in 2020. The first closure
project was bid in February of 2020 and was focused on the former construction and demolition
(C&D) landfill area and west slopes of the municipal solid waste (MSW) landfill. The Phase I final
cover construction took place during the 2020 construction season. The second Phase of
construction at the Logan Landfill involved a contract extension with the Phase I contractor (Ormond
Construction) and took place during the 2021 construction season. Phase I and Phase II closure
construction events were documented together with the construction report submitted on
December 22, 2021 with subsequent approval from the Division of Waste Management and
Radiation Control being issued on January 26, 2022.
This report is to document the closure of Phase III at the Logan Landfill which was completed by
Ormond Construction. Appendix A - contains the Phase III plans and revegetation specifications.
The Phase III construction used the same construction specifications, QA/QC Plan and contractor
from Phase I and Phase II with the only changes being the location of the cover soil placement.
The total area covered by the Phase III cover construction is approximately 12.4 acres with the total
extent of closed landfill presented in Appendix B.
Section 2 – Construction Quality Assurance
The Phase I and Phase II closure of the Logan Landfill was governed by the Class I Landfill Final Cover
QA/QC Plan dated February 3, 2020. The QA/QC (quality assurance/quality control) Plan detailed
the approach necessary to adequately construct and document all closure activities. Phase III was
likewise governed by the Class I Landfill Final Cover QA/QC Plan.
Appendix C contains the text of the project QA/QC Plan.

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Section 3 – Final Cover Soil
The Phase III Cover Construction utilized the soils generated from the construction of various
commercial developments in Cache Valley. Appendix D contains the transmittal letters, soil use
memos (with laboratory test data), and associated Division of Waste Management and Radiation
Control approvals for the soils utilized in the Phase III final cover construction.
All cover soils were tested by IGES for conformance with the design intention prior to being imported
to the site and utilized in the final cover construction.
Section 4 – Erosion Control
In addition to the reseeding of the final cover surface, additional erosion control measures were
taken by the city. Access roads with drainage ditches were incorporated in the final cover surface
and mulch was added for additional erosion control. The use of straw wattles was discontinued in
the Phase III cover construction since the wattles installed in the Phase I and Phase II cover were not
instrumental in the reduction of soil erosion. The mulch was so effective in reducing storm water
flows that no sedimentation occurred at the straw wattles. Appendix E presents the updated
erosion map.
Section 5 – Documentation
Construction of the Phase III cover was conducted over an approximate two-year period of time
from late spring of 2022 through spring of 2024.
Once the soil source was tested, the single most important aspect of the cover construction was the
placement of the final cover soils to the prescribed depth. The depth of soil was controlled by global
positioning satellite (GPS) equipment installed on earth moving equipment. The intermediate cover
soil was graded to provide a uniform surface and to remove the bulk of vegetation growing on the
surface. Once the intermediate cover soil was regraded, a survey of the landfill surface was
conducted to document the contours of the intermediate cover. A second survey was performed
once the final cover soils were placed to confirm the thickness of the final cover soils prior to the
excavation of test pits to confirm the cover soil thickness.
The depth of the final soil cover was documented by excavating 33 test pits over the 12.4 acres of
final cover. The test pits were located in a grid pattern to more uniformly represent the closure
area. The results of the test pit excavations show that the depth of final cover exceeded the
required 24” in every test pit with most of the test pits showing soil depth closer to 36” of soil
thickness. All of the excavations were photographed for QA/QC documentation. Several select
photographs of the final cover construction are included on the following page:
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The construction of Phase III final cover was also documented via drone photographs.
Representative photos of the Phase III final cover area are as follows:

Phase III Final Cover – Looking North

Phase III Final Cover – Looking North
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Section 5 – Construction Cost
The construction of the approximately 12.4 acres of final cover at the Logan Landfill was performed
by Ormond Construction Inc. A copy of the final Ormond Construction billing is presented in
Appendix G. Change order 7 through change order 11 are the costs associated with the Phase III
closure. The costs to purchase, haul, and place the cover soils as well as the costs for all revegetation
and erosion control was $1,312,213 for the Phase III closure.
The final invoice shows change orders 1 through 11 along with the original contract amount of
$455,115.24. Phase I and Phase II costs are represented by the original contract amount plus change
order 1 through change order 6 for a total construction cost of $1,173,807 for Phase I and Phase II.
Section 6 – Opinion
Based on periodic site visits, photographs of the landfill closure activities, contractor provided data,
and a final field visit in summer of 2024 it is IGES’s opinion that the Phase III cover construction was
performed in accordance with the Class I Landfill Final Cover QA/QC Plan and associated drawings
prepared by IGES.