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Bolton & Menk, Inc. <br />Project B2204011.00 <br />April 20, 2023 <br />Page 4 <br /> <br /> <br />Corrosion Potential <br />The soil borings indicate the site predominantly consists of clayey soils at anticipated utility invert <br />elevations. We consider the clayey soils to be moderately to highly corrosive to metallic conduits. Where <br />utilities extend through organics or clay soils, we recommend bedding the utilities in sandy soil free of <br />any clay lumps or constructing the utilities with non-corrosive materials. <br /> <br />Engineered Fill Materials and Compaction <br />We recommend reuse of the existing site soils for utility trench backfill. Placement should follow the <br />recommendations included in Section C.2 of our original report. <br /> <br />Pavements <br /> <br />Once the utility trench backfill has been placed and the pavement subgrade prepared as outlined in <br />Section C.2 of the original report, we recommend placing the following pavement section based on the <br />assumed R-value of 15 included in our original report. <br /> <br />Table 2. Recommended Bituminous Pavement Section <br />Material <br />Thickness <br />(inches) Designation Specification <br />Bituminous Wear 2 SPWEA230B <br />2360 <br />Bituminous Non-Wear 2 SPWEA230B <br />Aggregate Base 6 Class 5 or 6 3138 <br /> <br /> <br />