1010 N BROADWAY EVCC 2018-01-01 MF Import

PROPOSED LIBERTY HALL,EVERE TCOMMUNITYCOLLEGE_-= Everett,Washington equal to the diameter of the dowels. The base course should be compacted to at least 95 percent MDD. We recommend PCC pavements incorporate construction joints and/or crack control joints spaced maximum distances of 12 feet apart, center-to-center, in both the longitudinal and transverse directions. Crack control joints may be created by placing an insert or groove into the fresh concrete surface during finishing, or by sawcutting the concrete after it has initially set-up. We recommend the depth of the crack control joints be approximately 1/4 the thickness of the concrete; or about 11/2 inches deep for the recommended concrete thickness of 6 inches. We also recommend the crack control joints be sealed with an appropriate sealant to help restrict water infiltration into the joints. Asphalt-Treated Base Because pavements may be constructed during the wet seasons, consideration may be given to covering the areas to be paved with asphalt-treated base (ATB)for protection. Light-duty pavement areas should be surfaced with 3 inches of ATB,and heavy-duty pavement areas should be surfaced with 6 inches,of ATB. Prior to placement of the final pavement sections,we recommend that areas of ATB pavement failure be removed'and the subgrade repaired_ If ATB is used and is serviceable when final pavements are constructed, the crushed surfacing base course can be eliminated,and the design portland cement concrete or asphalt concrete pavement thickness can be placed directly over the ATB. Drainage Considerations We anticipate shallow groundwater seepage may enter excavations depending on the time of year construction takes place, especially in the spring and winter months. However, we expect this seepage water can be handled by digging interceptor trenches in the excavations and pumping from sumps. The seepage water if not intercepted and removed from the excavations will make it difficult to place and compact structural fill and may destabilize cut slopes,especially cut slopes in the silts and clays. All paved and landscaped areas should be graded so surface drainage is directed away from the building to appropriate catch basins. Water collected in roof downspout lines must not discharge into or be routed to the perforated,pipes intended for footing or wall drainage: Recommended Additional Geotechnical Services Throughout this report,recommendations are provided where we consider additional geotechnical services to be appropriate. These additional services are summarized below: ▪ GeoEngineers should be retained to review the project plans and specifications when complete to confirm that our design recommendations have been implemented as intended. ▪ During construction, GeoEngineers should observe and evaluate the suitability of the foundation subgrades,observe removal of unsuitable soils,evaluate the suitability of floor slab and pavement subgrades, observe installation of subsurface drainage measures, observe and test structural backfill, and provide a summary letter of our construction observation services. The purposes of GeoEngineers construction phase services are to confirm that the subsurface Page 20 June 1O,2010 GeoEngineers,Inc. File No.5836.010.00