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��� <br />A�x <br />�Hxc~i� <br />Hxl�—i <br />�C o <br />H 70 <br />� M '�C <br />V1 H <br />xo <br />H <br />�NC <br />��g <br />�V � <br />t"y� <br />HH <br />8" <br />� <br />o�v� <br />��� <br />� <br />I �� <br />� <br />� � <br />DAVID L. NELSON AND ASSOCIATES, INC. <br />Consul�ing EnginccrinG Gaulugl� <br />Febcuaiy 8, 1990 <br />Pco7ect No. 0890 <br />Page 5 <br />2H:1V, and ptopexly protected fzom ecosion. All fill placed dovnslope of <br />building sites and drivevays should be placed as stcuctucal fi11. <br />Devatecing 6 Dealnage <br />Azeas intended for development, including excavations and foundation <br />placement, should be adequately devatered, and peovided vith pcopec dcainage. <br />Ne cecommend the use of cut-off dcains in khe azeas of outciopping or shallov <br />qco�nd vatec. These dcains should be couted lnto the existing stocm dcain, <br />located along Temple Dcive. The depths and extent of the dcains vill be <br />dependent on the final excavation elevations and ground vatec elevations at <br />the time of constZuction. The evaluatton and design of these dxains vould be <br />tncluded vith the secvices pcovtded duzing ouc ceviev oE the plans and <br />monitozing of the excavation. <br />Ezosion potential should be considered modezate to sevece foc stripped ;zeas <br />vith 154 or steeper gtades. Ecosion patential Eoz azeas In vhich the existing <br />lov gcound cove[ is left intact, and surface vatei is contzolled, is expected <br />to be unaEfected by the pcoposed development. Constcuctiun phase ezosion <br />contcol could include, but not necessacily be limited to the use of hay bales, <br />geotextile bazriecs (stlt fences), and controlled sucFace gcadiny. The <br />tempotaiy cut slopes vill be highly susceptible to e=osion. We cecommend that <br />all cut slopes be coveced vith heavy plastic sheetinq to pcevent etosion. <br />Roofs and pavements vill ceduce the sucface a:ea avallable ioi natuzal <br />infiltzation vithin the site. This vill in tucn incxease suLface runofE. Be <br />tecommend that zooE dzains, catch basins oL othec devices used to collect <br />suxface runoff be dtcected by tight line into the stotm d=ain oc othec <br />suitable system. Runofi should not be alloved to dischaLge onto sloping <br />gzound ot to satucate Eoundation azeas. SucEace dcains should be maintained <br />sepazately, and not interconnected vith foundation o= vall drains. <br />