6230 SPRING ST A&B 2016-01-01 MF Import

3.0 CONCLUSIONS AND RECUMMENDATIONS Our exploration indicetes that Erom e qeotechnicel etendpoint, the parcel ia euiteble tor the proponed development provided''the recommendatione conteined herain ere properly followed. The denee to very denee till encountered in the exploration pite end obeerved in-plece elong the weetern edge oE the excavetions Mill provide euitable beerinq aupport ior the rock mate. Spread Eootinqa, as plenned, may be uaed for buildinq aupport Eor the proposed duplex epertment etructurea Nhen placed over properly conatru�ted rock meta. . In order to reduce the riek oE eettlement we recommend that the surlicinl eilt end aend �:►�ich baa eccumulated on tep ot the rock Mets be removed prior to piaaement o[ additiort5l 4'co 6 inch querry epells. It ie eupqested thet removel of t;:e aurticial ailt end •end be eccompliehed by usinq e treckhoe (Mith the teeth coveced) to ecrape the msterial of[ of the underlyinq rock. NeN rock ehould then be pleced in 1 foot lifte end compected up �o en elevation et leeet 6 inchee ebove the hiqheet expected Natur level within the buildiny ereee. The querry epelle mey lhen be capped with e leyer ot 9 minue inch cruehed querry rock to ect es e leveliny couree. The qusrry epelle end cruahed rock munt be rolled Nith e compecter to echieve e tightly pecked maee. Stayinq ezeee ehould be �einteined eo that the rock is not contemineted by mud prior to plecement in the excevetion. I.E deeired for subalab preperetion, compected, cleen eand may be pleced on top ot the cruahed 7 minua inch querry rock. Re ere evailable to provide monitoring servicee during co�struction. The inteqrity ot the foundaEion depende on proper aile preparation end� conetruction proceduree. He recommend that the followinp inepectiona be performed by e qeotechnical enyineer/enqineerinq yeoloyiet Irom our tirm ea conatruction precedea. 1) Eo1loMing removel oE the eccumulated ai1C end sand layer Mhich currently covere the in-plece rock. 7) A representative ahould obaerve the recompection oE the top oE the exietiny rock mat prior to placement oE new rock. J) A representative ahould observe the compaction of the new rock to verify that it i� in e tiqhtly pecked condition. �4). Prior to backfilling, the drei�aye pipe for the rock met should be observed. 5) Additionally, we recommend that footing inspectione be per- formed prior to pouring concrete, to veriEy thet rock hae not been diaturbed end dreinaqe ie mainteined. 11s. previouely noted, the planned draioepe plena Eor th• rock mat• con�l�l�d o[ pr�vity dr�in�p• o!!�!t• vl• !h• •xi�linp ds�ln�q� d!lah��. Dr�in�p• trom th• tock met� to tha dischecqe poinE ehoUld .t