500 LAUREL DR 2016-01-01 MF Import

Geotechnical Engineerin� Study Page 34 � 00-2267 Three Story Addition - 500 Lau�rel Street, Everett T January 31, 2001 ; Y As an altemative to a free-draining backfill, the owner may wish to considerthe use _ of a composite drainage fabric, such as Miradrain, �iell:a-Drain, or an equivalent approved in writing Liy the geotechnical engineer, behind any foundation stem �Nalls or retaining walls. This composite should be placed clirectly again:,t the �ace of T the wall (or�ce ihe wall has been suitably wateiproofed �vith bitumastic paint'� with _ the filter cloth facing the soil surface. The geotextile fal�ric "tail" of the composite should be wrapped overthe basal drain line and its surrounding fres-draining ��ravel — to make a clean and direct connection. Backfill is ther� placed against the — gaocomposite covered wall, and is compacted s�s it is raised back to desiqn site _ elevation. This option also allows for the reuse of previously excavated on-�ite soil rather than an imported free-draining material and, thus, offers a smail cost "' savings. �- Roof Drainage: The secand most impe�?ant drainage control element is the tightlining of all �oof downspout d6scharge. Under no circumstances should the building roof downspout lines be connected to the footing drains. Downspouts — must be separately tightlined io d;ycharge. We also recomrr:snd the installation of , sufficiert cleanouts to allow for easy and periodic duwnspout drainline flushing and maintenance. It has been our experien�e th�t the most functional cleanout spacing ' is for one to be installed at any bend or corner in a drain system and at a spacing � of about thirtyfive (35) feet in straight pipe rurs. This will help to keep the _ potential extent of drain line cloggin,�, to a small segment of pipe that can be cleared with relative ease. r � Because uf the proximity of the residence to the crest of the west��m bluff slope we recommend that ever� reasonable effort be rnade to clirect the roof downspout � tightlines (as well as the footing drain;l down the drivew�;� tc� the noRheast to connect to either a storm drain c�,tch basin or a manhole structure. In this � mannei the potential for any surface flow from the roof of the residence, as well as any shallow subsurFace seepage, ��:�il be directed away from the crest and face of the western slope. j Erosion Control: Because the propcsed construction area is close to the crest of the western bluff slope :t is imp��rtant to preven; any temporary surface water discharge from transporting soil fines of� the site and ��nto the adjace�t driveway, neighboring residantial lots, oroverthe site slope. WP recommend that appropriate e� osion control measures be implemented in design and construction to avoiu this 98