1505 INDUSTRY ST Geotech Report 2018-01-02 MF Import

Our services lor ihis project were compictcd in �eneral accardance with aur Services Agrcement dated January I9, 2005. Vcrhal authorization to procced with our scrvice, was providcd hy C-NSR Corporation on January 21, 2005 and written authoriration was reccived on Janu:uy 2�, 2005. BACKGROUND PREVIOUS EARTHWORK Mass Earfhwork in 2000 and 2001 The sitc is lucatcd in an arca that has undcrgonc cxtcnsivc rcgrading. 'I'hc ccntral portion of thc sitc was cut up to 30 fcct dcep in arcas intu dcnsc na�ivc glacial till and advancc uutwash dcpntiits. This nrc;i is locatcd ovcr a Conncr sand und gravcl pit. which �vas subscqucNly backlillcd with swctural till. "Chc fill is approximatcly 40 fce[ thick :ilon�; �hc cast sidc of thc si[c. Approsimatcly 10 fecl of stnictural fill was also placcd in thc westcrn :�rca of dic sitc lo achicvc currcnt sitc gradcs. Gcoinginccrs obscrvcd and tesled tlic structural fill that w:is placed and compacted in the mined �it as well as stnictunl lill placed in the nurthwest arca of the sitc. Grading ;md pit tilling at the cite xcurred in Ihe summers of�000 and �001. �Ve prcparcd over I50 field reports ducuntenting our obscrvatians and the candition of d�e till that �ve obscrved during carihwork activities. Stnictural fill placed in the mined pit and on othcr ponions of �he property was gcncrally compactcd to at Ic:tst 92 perccnt of q�c maximum dry dcnsity (MDD) per American Society for Tes[ing und Materials (AST�I) D 15�7. The upper 3 to 5 feet o(till pl:�ced nlong thc cast portian of thc sitc was gencrally compactcd to at Icast 95 perccnt �IDD per AST1�1 D 1557. A Icttcr sumnmrizing cartl��vork activities that wc uhscrved in 2000 nnJ 2001 is induded in :\ppcndix A. Detailed descriplions of e;�rth�curl: uper;uiuns ;md compactiun test residts are described in our daily field rcports. Former Mined Pit Highwall Pnrn�cr mincd pit highw:�lls csist alung thc north sidc and undcr thc cast purtion of thc site. Thc ; highwalls arc �hc limits of d�c I'omicr mincd pit and are typically vcrtic;dly mincd houndaric,. 7'he north mined pit highwall is about 40 fecl high and ncar vertir.il, is located roughly �30 tict south of tilerrill Gcek Parkway and r.xtcnJs approximatcly 350 icct into thc sitc IWIII lI1C f85t �CO�I`ItY III1C. Tlll IlOffll highwall appcan to bc located along thc �iorth landscapc buffcc �nc wcstcm highwall of thc Comic� mincd pit is located under ihe cast half thc proposed building fuotprint. Tlic west highwall was also about JO Icct high, but this highw;ill w�s Ilattcncd to a 3:1:1 V (horizonCd:vertical) slopc during grading. 'i hc highwall was tlattcncd ta crcatc a gradual transition bchvcen thc nntivc soils and ovcdying stniclur;d fill in urdcr to reducc potcntial diffcrcntial sctdcmcnt. Sinic«iral till was "kcycd" into thc nativc snils by cscavating a scrics of horizunta: benchcs during backfill operatiuns. [3ascd on our rcce;ds, ihc ' ,ipproxima[c lacalion oF thc buricd 31 C t V high��all is shown on Pigure 2. Additional Earthwork Siibscyucnt to thc Edl uf 2001, carth��vrk on thc property was parf'ormcd by othcrs. G•co[nginccrs did nut ubscrvc carthwork activitics :dier comple�ine our 2001 scniccs. This' included constniction of thc cxisting pennanent storntwater dctcntiun pond located �ecst uf thc site. thc rocL:ery along the tvest pruperty linc, installation uf cxistinc wilitic., con�uuction o(Icmpor:�ry �Icicivion swales and bnsins, and othcr sitc Erading. Borings by ENSR Corporation I�:��SR Curpuratinn drillcd 13 soil harim�s(513-I w SD-13j and insiallcd threc monitoring wclls(bIN-1 to ��iN-3) ut thr iitc in Ucccmb�r �004. "1'hc soil borings wcrc drillcd to dcpths ranging (rom 20 to 75 fect i-'J,:'�� Cn18-�;nl-r,� � � � �� .� ..�'��Q� ' GEOENGINEFIIS� Jmwwv.'�. :[n f