ARCHIVED REPORTS_2019 SOIL MGMT PLAN (JULY-REVISED)

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Murphy Parkway Warehouse December 19, 2016 Job No. 146-618 Page 5 CORROSION POTENTIAL Two samples of the native soils from anticipated pipe horizons were submitted to an associate laboratory for corrosion evaluation tests; the test data are presented on Plates 23 and 24. We have used criteria established by the Ductile Iron Pipe Research Association to evaluate the corrosivity of the soils tested to iron pipe. The criteria assigns point values to the test results as well as a subjective evaluation of moisture conditions at pipe level; a total point value of ten or higher indicates the soils are potentially corrosive to iron pipe. Our evaluation indicates total point values of 2. We conclude that the soils are not corrosive to gray or ductile iron pipe. Based on the Portland Cement Association (PCA) guidelines, the soluble sulfate content of the site soils indicates that the relative degree of sulfate attack on concrete is negligible, and therefore use of Type I, Type II, or Type 1-II portland cement is appropriate. RECOMMENDATIONS EARTHWORK The building pad and pavement areas should be cleared of surface vegetation, trees and root systems, rubble fragments exceeding three inches in maximum dimension, rubbish, and any other debris. Any earth berms, stockpiled soils and any other existing fills should be removed. Fills were found in Boring 2 to a depth of about five feet on the northwesterly corner of the property. These fills should be overexcavated to allow replacement as engineered fill. Test excavations should be made on the northwesterly corner of the property and adjacent areas with our representative present to check for the presence of old fill materials. Unsuitable soils identified by our representative should be removed. Any underground pipes within two feet of original or final grade (whichever is lower) should be removed. Abandoned pipes exceeding two inches in diameter should be removed from the building areas regardless of depth. Low areas should be cleaned out of any loose or saturated materials. Excavations required for the removal of the above items, as well as any other loose or unstable soil deposits identified by our representative, should be cleaned of loose, saturated or soft materials so that firm undisturbed soils are exposed. Deep excavations required for the removal of the above items should be sloped back to a dish shaped configuration allowing through passage of compaction equipment. Any deep excavations should be restored to grade with engineered fill placed and compacted in accordance with the recommendations of this report. Areas designated to receive engineered fill as well as building pad and pavement areas left at existing grade should be scarified to a depth of eight inches, brought to a uniform moisture content of at least optimum, and compacted in place to at least 90 percent of the maximum dry density determined by ASTM D1557-02 test procedure. If recompacted subgrades are unstable or compaction cannot be achieved due to high soil moisture contents, our firm should be contacted for further recommendations. Engineered fill should be placed in lifts not exceeding six inches in compacted thickness, brought to a