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::'r-��.tri��i.ls,V�'l� �Oi•:.Ii�C. <br />:uldition to noti(�im� L:cology of proposcd :iction, a public a��cnc� is also ablc to rcquest <br />matching funds from the state to assist with cleanup costs incuRed. <br />Gi��cn thc impacts to construction, wc rccommcnd that thc primc contracror and excavation and <br />shoring subcontractors be familiar ���ith these site conditions (via meetings, plans, specifications, <br />or ather projcct documents) so thcy are prepared to address contamination in the Celd. This <br />prcparation includcs using appropriately traincd personnel; proper segregation, handling, and <br />disposal of contaminated soil; and collection, possiblc treatment, and disposal of groundwater. <br />Proper handling, screcning, storing, tcsting, and disposal procedures should bc includcd in thc <br />projcct specifications. 5hannon &�1'ilson should prcparc a Construction Contingcncy Plan to <br />hclp ficld personncl be prcp:ved for, identify, and properly haudle contuminated soil and <br />�sround���atee The Construction Contingency PI:�n ���ould also ad�iress proper equipment cleanim� <br />during ancUor aftcr work within thc contaminated cxca� ation zonc. <br />During consuuction, we further recommend that when exc:rvation is occurrin�� in the gcma:�l <br />vicinity of borings B-10, B-l2, I3-13, B-l4, Q-I6, and I3-lS, or if anothcr arca of putcntial <br />contamination is disco��crcd during sitc activitics, that �vc bc on sitc to ficld screcn soil for thc <br />��resence of contamination. 13ased on sampling and analyscs during (icld investig�tions to datc, <br />contaminant Ievels in the soil do not excecd proposed cieanup levels eseept at boring B-18. <br />I lowcvcr, thc prescncc of small amounts of contamination can causc an odor. Our c�pericncc is <br />that any soils with a detectnble hydrocarbon ador ���ill not be accepted as "dean fill:' r1s a result, <br />sume cxcavutcd soils may necd to bc scgregatcd for scparatc disposal even if thcy do not e�ceed <br />cicanup Icvcls. As our asscssmcnt continucs wc ���ill cstimatc thc c�tcnt of thc contaminant <br />plume so that the contractor can plan accordingly. Pield screcning will assist in segregating <br />"cican" soil fl'om impactcd soil for disposal pmposcs. It will also pro��idc a basis for L'cology- <br />rcquircd ducumentation th:u ��c �� ill submit follo���ing soil rcmo��:�l. <br />10.11 "I'emporary llc«�alcring <br />�Vc rccommend that thc groundwalcr inflo��� into dic cxcavation bc controllcd for soil nailing <br />operations and to providc dry conditions for construction activitics. In our opinion, a <br />combination of pre-exca��ation aquifer dcpressurization and conswction dewatering will be <br />required to achieve thcse goals. Aquifer depressurization using deep dewatering ���ells and <br />beginning a minimum of Id days prior ro cxcavation aclivitics would allow initial cxcavation <br />acli�itics to comnunce. :1 �;iruum exhacti�m/��ell p��int s�'stem c;m be subsequentlti� inst:illed <br />21.1-U�L.41�I�.til��•p 11.1 <br />�� <br />? 1 I -09Ga-I-005 <br />