ARCHIVED REPORTS_2018 VERIFICATION RPT (DEC)

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Brusca File No. 137-002 Page 9 December 14, 2018 Murphy Parkway Property Waste Materials Management Verification Report 6.2 Placement and Cement Treatment of WU1 Materials The relocation, placement, and cement treatment of the materials removed from the WU1 area was performed in accordance with the provisions of the referenced May 23, 2018 Waste Materials Reuse Workplan. The materials reuse activities were observed by a Certified Engineering Geologist from our firm. Additionally, the project geotechnical engineering firm observed the work and performed quality control testing (i.e. to ensure that the proper percentage of cement was utilized during treatment activities and to confirm proper moisture conditioning and compaction of the materials). All of the materials contained in the stockpiles of material removed from WU1 were transported with earthwork equipment and placed in the upper one foot subgrade within the westerly approximate one-half building pad (see Plate 4). Subsequently, the upper one foot of the entire building pad subgrade was treated with at least five percent Portland cement, as determined by dry unit weight. The treated mixture was moisture conditioned and compacted. Materials generated during trimming of the treated building pad to final grade, and all materials generated during foundation and utility trench excavation within the upper one foot of the building pad were placed beneath the adjoining dock pavement area to the north of the building (area designated to be concrete paved); as these materials were removed from the upper one foot of the building pad, they contained some WU1 materials. Subsequently, the upper one foot of the soils within the northerly dock area (as well as all other site pavement areas) was treated with at least five percent Portland cement, as determined by dry unit weight, and the treated mixture was moisture conditioned and compacted. Following preparation and cement treatment of the building pad subgrade, this entire area was covered with a seven-inch thick reinforced concrete floor slab designed to achieve a minimum 28- day unconfined compressive strength of 3,000 pounds per square inch (psi). The northerly dock area was paved with a six-inch thick reinforced concrete pavement designed to achieve a minimum 28- day unconfined compressive strength of 4,000 psi. The relocation, cement treatment, and capping (i.e. placement of the concrete floor slab and concrete dock pavements) of the reused materials from WU1 has been successfully completed and verified per the provisions of the approved Waste Materials Reuse Workplan. The potential for future leaching of any residual soluble metals from these materials to groundwater beneath the site is considered be negligible. 6.3 Land Use Covenant Per discussions with the involved regulatory agencies, a land use covenant (LUC) will be established for the subject parcel that prohibits residential, day care, school, or hospital usage of the subject property. The LUC also will prohibit the use of groundwater beneath the property for drinking water purposes, and will establish provisions for future management of reused wastes and maintenance of the building floor slab and pavements that cover such wastes in the unlikely event that the wastes are disturbed in the future. The LUC is currently a draft document that is being reviewed by the involved parties. This Verification Report will be referenced in the final LUC.