Laserfiche WebLink
I�ugust I H, 200d <br />Mr. Jim Thomas <br />13clvcdcrc Lo1s 32 and 3] <br />L&A Job No. 4A088 <br />P,i�:c 17 <br />Itunoff ovcr Impcn ious Surfaccs <br />titorm runoffo�cr impervious surfacc, sucG as roofs anJ drivcway pavcmenl, shnuld hc culicctcd <br />by underground dra�n linc systenu connccted lo downspouls and by ca�ch basins installcd in <br />drivr.ways. Sturmwalcr Ilws collccicd should bc lighllincd to dischargc into a s�orm scwcr or a <br />suitable stonnwaler disposal facility. Sufficient nunibers of cicanouts should be provided to the <br />underground drain IIOC SYSICIIIS 8� SIfBIC�II' location lo allow for periodical cleaning o( ihe drain <br />lincs. <br />BuilJing I�uuling Urains <br />A subdnin should bc insiallcd, as royuired, arowid thc perimctcr foolings of cach building. 'l hc <br />subdrains should consist of a 4-inch-minimum-diameler, perforaled, rigid, PVC, drain pipe, laid <br />a Icw inchcs bclow the botwni of perinulcr loolings. 'I'hc lrcnchcs and lhc drain lincs shuulJ <br />have a sufficient gradie,u lo generate flow by gravity. l'he drain lines should be embeddcd in <br />washcd gravcl complctcly wrappcci in non-woven �iltcr fabric to within about 12 inchcs of finish <br />grade. Su(Ticienl numbcrs of cleanouts sho�dd be provided to lhe undergmwid drain line systems <br />at stratcgic location to allow lor periodical dcaning of Nic drain lincs. Thc rcmaining trcnchcs <br />may bc b�ckfillcd with on-sitc impervious soils. Waler collectcd by tlie perimcler footing <br />subdrains shuuld be tightlineJ, separately (rom the roul and surl:�ce stormwater drain systems, to <br />Jischargc inlo a stonn scwcr or a suitahlc slormwaler disposal faciliry. <br />RItiK GVALUATION 5'I'A'1'GMCN'f <br />l hc silc is undcrloin at rclati�cly shallow dcpth by dcnsc to vei}'-dcnsc Lsperancc Sand soils. <br />I hcse soils arc of high to very-high shcar slrcngth in undiswrbed native state. It is our judgment <br />ihat provided lhc rccommendations in tliis repoil are fully implcntcn�ed during construclion and <br />attcr th� complclien of Ihc dcvclupmcnt, thc arcas disturbcd by conslruction will bc stabiliud <br />❑nd remain sl�ble nnd �vill not incre,�se thc potential for soil movement. In our opinion, the risk <br />LIU & ASSOCIATCS, INC. /`������ � <br />�_ <br />