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DLA005-86-B-0008 PAGE 11 OF 69 backfill shall be piled in an orderly manner a sufficient distance from the banks of the trench to avoid overload' and to prevent slides or � cave-Lis. All excavated asphalt/ concrete tops and concrete foumdaticns shall be hauled off the Depot by the Contractor. Lnless othen- gise indicated, excavation shall be started by open cut. 1-k ere gravel finish surface etist, gravels shall be scraped off to earth grade and piled in - an area designated by the Contracting Cfficer prior to excavation. Preceding gravel shall be used by the Contractor as surface finish after backfill. Gravel surface sites are lose 30 and north of Bldg. 203. 2-06. Be'Lf.FILLING: Backfilling shall not begin until authorized in writing by The San Joaquin County Local Health District. Authorization shall be obtained by the Contractor. The preceding shall be followed only if there is soil contamination. If there is no soil contamination, autho- sization to backfill shall come from the Contracting Officer. , 2-06.1 Backfill '-%terials: Satisfactory material as determined by th:. Contracting Otrics-, shall bre used in fills. Satisfactory material shall be free from roots, other organic matter, trash, debris and stones is-ger than 3 inches in any dimension, with not greater than 35 percent fines, a liquid limit not to exceed 35 and a plasticity index not exceeding 12. Excavated suitable material for backfill shall be used last. . 2-06.2 Preoaraticn of Ground Surfaces: Unsatisfactory material (as creme= reo oy the Contracting Officer) in surfaces to receive fill shall be removed. The surface shall be scarified to a depth of 6 inches before fill is started. When subc�7ades are of less than 95 percent density; the ground surface shall be bmik_n un, pulverized, and ccmpected to the specified density. 2-06.3 Placing: Backfill material shall be placed in horizontal layers not e:•:ceedirg 8 inches in loose depth and then compacted. No Mterirl shall be placed on surfaces that are muddy. 2-06.4 C=action shall be performed by rolling with approved tamping roiiers, or other ecraipment approved by the Contracting Officer suited to t1n soil being compacted. Material sha-11 be moistened or aerated as necessary to provide the moisture content that will readily facilitate obtaining the specified compaction with the egr_pment used. Each layer shall be compacted to not less than 95 percent. 2-07. ASPHA:.TIC 0.7\CRE7r-: This ti:ork shall consist of furnishing and mixing aggregate and asuhalt birdcr at a central mixing plant, and spreading and cczpacting fne r.:i==e. 2-02