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ss;.crar.or� �:���r�! sor.. inc. <br />meets combined scwer discharge criteria, it may be dischargcd dirccQy into thc sewcr. If the <br />County decides not to discharge directly into the combined sewer, or if thc groundwater does not <br />mect dischargc crite�ia, the groundwater would necd tu bc trcated and thcn disposed. <br />Shannon fi Wilson could dc��elop a groundwatcr rcmediation system design. Thc system �vould <br />collect and treat the water until it meets applicable city, state, ancUor federal criteria for discharge <br />to the sewer. Groundwater that is collected may bc treated on site with in-line filtcrs or using <br />air-sparging or othcr methods to remove the volatile constitucnts prior to se�ver dischargc. <br />Pcriodic sampling of groundwater ���ould be conductcd to evaluate effectivencss of trcatment mid <br />verify that cont.iminant Icvcis mcet discharge critcria. Dischargc ro the sewcr will require <br />coordination prior to projcct completion, and discharcc permits (from thc scwcr utility agcncy or <br />othcr agencies) would nced to bc obtained. <br />Pollo���ing completion of site excavation ancf installation of perm:inent drainage, Il IS �7�1SSIL)IC <br />that contaminatcd ground���atcr will rcmain in thc sitc vicinity. Groundwatcr �ti�ill bc collccted in <br />thc soil nail drainagc matcrial and transported down to thc footing drains, and it will bc within <br />thc underslab drainagc systcm. r�t this timc, it has not bccn dctermined if thcse three systcros <br />���ould bc isolated from cach other or comhined to dr;iin towards a sump. As mcntioned abo��c, it <br />has not been detennined if any contaminated groundwater collected by the permanent drainage <br />system will be discharged into the comhined se��cr or Ireated and disposed oC separatcly. <br />111.13 Pcrivanent Dr.�in:��c <br />10.13.1 Iiackfilled [iascment 11'alls <br />�\'c recommend that frec-draining, granular soils be used for any backfilled basement or <br />huri� �I �calls. Thc frcc-draining backfill should bc hydraulically conncctcd to thc subdrain <br />system. Pi�ure 7 presents typical recommendations for �� all subdrainagc and backCilling. This <br />figure includes cotnpaction criteria and gradation rcquirements for drainagc matcrials. <br />10.13.2 Soil Nail Shoring 1Valls <br />The soil nail shoring walls ���ill incorporate a drainaoe material bet���een the shotcrete <br />f:i�ing and the c�cavatcd soiL This drainage material will bc hydraulically connected to thc <br />��rrimeter footino drain .Il II7C V:15C O� IIIC CXC8V8tion. Details of this connection will be shown on <br />thr li�rthcomin�� soil nail ��:ill plans. <br />,i.i.n,�ni�.i���.r.i,,,p i�d <br />20 <br />21- I -096-14-0OS <br />