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�� KLEINFELDFR . Gradation (ASTM C136) Sieve Size Percent Passina 3-inch 100 No 4 50 — 100 No 200 15 - 70 Plasticity (ASTM D4318) Liquid Limit Plasticity Index Less than 30 Less than 12 Organic Content ASTM-D2974 Less than 3 percent All imported fill materials to be used for engineered fill should be sampled and tested by the protect Geotechnical Engineer prior to being transported to the site Where access for compaction testing in deep trenching operations is limited by trench stability, safety, and other access concerns, a cement slurry backfill or controlled low strength material may be used for backfill as long as adequate pipe anchoring measures to prevent pipe floating are employed The slurry should be adequately vibrated into position under the spring line of the pipe Compaction Criteria . All backfill soils, either native or imported, required to bring the site to final grade should be compacted as engineered fill Engineered fill composed of potentially expansive clay should be unif� oo=mIv moisture-conditioned to between 2 and 4 percentage points above the optimum moisture content, placed in horizontal lifts less than 8 inches in loose thickness, and compacted to at least 90 percent of the maximum dry density as determined by ASTM Test Method D 1557' Engineered fill composed of cohesive and non-expansive sands, silts and import fill should be uniformly moisture-conditioned to between 1 and 4 percentage points above the optimum moisture content, placed in horizontal lifts less than 8 inches in loose thickness, and compacted to at Ieast 90 percent of the maximum dry density Additional fill lifts should not be placed if the previous lift did not meet the required dry density or if soil conditions are not stable Discing and/or blending may be required to uniformly moisture-condition soils used for engineered fill The upper 12 inches of subgrade soils in pavement areas should be uniformlv moisture- conditioned to between 1 and 4 percentage points above the optimum moisture content and compacted to at least 95 percent relative compaction All trench backfill in structural areas should be placed and compacted in accordance with recommendations provided above for engineered fill During backfill mechanical compaction This rest p ocearu e should be used i JIV eve, 1 elarive conivactzon main urn an densin of oprz?raunz 17201st141 e • comenr s r efe)enced wimm tans ,epos r i 3629 CD1/2003R369 sprit 19 003 002 Kiemietaer inc °a¢e 10 of 16