223 PECKS DR 2016-01-01 MF Import

,-. ,•,,� Temporarv Excavations Sloped temporary construction excavations may be used where planned excavation limits will not undermine existing structures or interfere with other construction. Where there is not enough room for sloped excavations, shoring should be provided. Rased on the subsurface conditions encountered in the testpits, it is our opinion that sloped temporary excavations may be made at slope ratios no steeper than 3/4 :1 (horizontal:vertical) for slopes up to 10 feet in height . However it should be noted that • the contractor is resposible for safety and maintenance of construction slopes. Surcharge loads should not be allowed within 5 feet of �he top of the slope or within a 1 : 1 (horizontal . vertical) plane extending up from the toe of excavation, whichever is greater. Stat� Su�nort Concrete slabs-on-grade should be supported on a minimum 6-inch thickness of free draining imported sandy gravel fill material (less than 5 percent fines) . The existing subgrade should be proof-rolled prior to placing the imported gravel fill and any soft or disturbed areas should be excavated and replaced with properly compacted fill. All sub.7rade fill should be compacted to at least 9� percent of the ASTM D1557 maximum dry density. The existing fill subgrade should be crowned for drainage as recommended below. site Drainaae A perimeter subdrain system independent of any roof drain system should be provide at or below the base of all exterior footings . The subdrain should consist of 4" diameter perforated PVC pipe embedded in at least one cubic foot of drain rock per lineal foot of drain. This system may be incorporated with the recommended basement wall drain system and should discharge to the stormdrain system or in a non-erosive manner below the site.