1010 N BROADWAY EVCC 2018-01-01 MF Import

PROPOSED LIBERTY HALL,EVERETT COMMUNITY COLLEGE Everett.Washington For preliminary planning, we recommend that the pipe piles be driven to the practical refusal criteria listed in Tables 4 and 5. Pile installation should be observed by a representative of GeoEngineers and the actual refusal criteria verified by the load test. TABLE 4. PRACTICAL REFUSAL CRITERIA FOR 4-INCH DIAMETER PIPE PILES Hammer Weight Refusal Criteria(seconds/inch) Blows Per Minute 850 I bs 14-16 550-1100 1100 lbs 10-12 550-1100 TABLE 5. PRACTICAL REFUSAL CRITERIA FOR 6-INCH DIAMETER PIPE PILES Hammer Weight Refusal Criteria(seconds/inch) Blows Per Minute 1100 lbs 18-20 550-1100 2000 lbs 10-12 550-1100 Footing Drains We recommend perimeter footing drains be installed around the proposed building. The perimeter drains should be installed at the base of the exterior footings. The perimeter drains should be provided with cleanouts and should consist of at least 4-inch-diameter perforated pipe placed on a 4-inch bed of, and surrounded by,6 inches of drainage material enclosed in a non-woven geotextile fabric such as Mirafi 140N (or approved equivalent) to prevent fine soil from migrating into the drain material, as shown on Figure 4. The footing drain pipe should be installed at least 18 inches below the top,of the adjacent floor slab. The drainage material should consist of washed 3/8-inch to No. 8 pea gravel per section 9-03.1(4)C AASHTO Grading No. 8, or "Gravel Backfill for Drains" per Section 9-03.12(4) of the 2010 WSDOT Standard Specifications. We recommend the drainpipe consist of either heavy-wall solid pipe (SDR-35 PVC, or equal) or rigid corrugated smooth interior polyethylene pipe (ADS N-12, or equal). We also recommend against using flexible tubing for footing drainpipes.The perimeter drains should be sloped to drain by gravity, if practicable,to a suitable discharge point, preferably a storm drain. We recommend the cleanouts be covered and placed in flush mounted utility boxes. Water collected in roof downspout lines must not be routed to the footing drain lines. Slab-on-Grade Fioor Subgrade Preparation We recommend concrete slabs-on-grade be constructed on a gravel layer to provide uniform support and drainage, and to act as a capillary break. We expect that slab-on-grade floors can be supported on a 6-inch gravel layer overlaying a 1-foot thick subbase layer of properly placed and compacted structural fill. Prior to placing the subbase layer,the subgrade should be proof rolled as described previously in the"Earthwork"section of this report. If necessary,the subgrade should be recompacted to a firm and unyielding condition. A geotextile separator, such as Mirafi 500X, may Page 16 June 10.2010 GeuEngineers,Inc. Fie Yo.sM.oio.oc