2000 TOWER ST ARTS AND SCIENCES BLDG 2018-01-02 MF Import

doweled joints, we recommend that the concrete thickness be increased by an amount equal to the diameter of the dowels. The base course should be compacted to at least 95 percent MDD. We recommend that PCC pavements incorporate construction joints and/or crack control joint; that are 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 that the depth of the crack control joints be approximately''/. the thickness of the concrete, or about 1'/2 inches derp for the recommended concrete thickness of 6 inches. We also recommend that the crack control joints be scaled 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 deep excavations depending on the time of year construction takes place, especially in the winter months. However, we expect that 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 excav itions will make it difficult to place and compact _tructural fill and may destabilize cut slopes. All paved and landscaped areas should be graded so that surface drainage is directed away from the building to appropriate catch basins. Roof downspouts should not discharge into the perforated pipes intended for providing wall drainage. Water collected in roof downspout lines must not be routed to the footing or wall drain lines. 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 revie", the p-oject plans and specifications when complete to confirm that our design recommendations have been implemented as intended. • During construction, GeoEngineers should observe temporary cut slopes, evaluate the suitability of the foundation subgrades, 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 confirnt that the subsurface conditions are consistent with those observed in the explorations and other reasons described in Appendix C, Report Limitations and Guidelines for Use. Q G c o E n g i n c e r s 17 File No. 5836-002-00/040204