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I SHANNGN t�W:LSON.INC. <br /> wPoBiaphy. Because of this, it is our opinion that founda6on subdrains should be <br /> Iconstructed around the perimeter of the proposed buildings that will be in cut areas. Theyc <br /> drains would not have W eatend along che fioo6ngs in fill or at gcade areas, although it <br /> wvuld be prudent to do so. Drains will intercept groundwater, and reduce the possibility of <br /> wecness below the structures. Drains that are brittle or that can crush under the weight of <br /> � construction equipment are not recommended. Collected watcr from drains should be <br /> dghtlined to the storm drain system. Convenient cleanouts should be provided to incmase <br /> the useful life of the drains. <br /> I <br /> Surface water should be directed away from the structums and should not be a1loHred to seep <br /> Iinto the ground close to the structures. For this purposc, the ground surface should be <br /> sloped away from the structums. Surface and dawnspout water should not be introduced <br /> ! into foodng subdrains. Surface weter should be captu�ed in catch basins and along with <br /> � dawnspout water should be conveyed in a non-perforated tightline inW the local dreinage <br /> Isystem. Surface water should also be directed away from the east slope, and if necessary, <br /> ditches should be inshdlled along the top of the slope to collect any overland surface w.tccr. <br /> IAdditionally, a ditch should be placed at the bottom of the proposed revegetated slopes. <br /> During construction, it will be necessary to control groundwater seepage and surface water <br /> Irunoff with a system of drainage ditches and swdles. Shallow tempordry ditches woutd be <br /> iequired W drain the law-lying areas and to dry out the soils surrounding these areas. <br /> Deeper cut-off tcenches, which penehate inW the glacial soils or below planned ezcavation <br /> depths, may be required in some a�eas to allow eaccavation to proceed in the dry. Grading <br /> iof the site to promote drainage will be necessary at all flmes. <br /> Except as otherwise designed or specifically covered in the contract, the conUactor should be <br /> � made responsible for the control of all ground and surface water encountered during <br /> construcdon. In this regard, sloping, ditching, pumping from sumps, installing trench dcains, <br /> Idcwatering, and other measures should be employed as necc•ssary to permit the proper <br /> completion of�wrk. <br /> I <br /> I <br /> I <br /> W-6693-01 <br /> I 26 <br />