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I a <br /> .t � <br /> , <br /> , <br /> _ ; <br /> 1(3)s /OS1 Qu111ly � <br /> Tota Detro� hydrocarbone (TPH) ie the moet common contaminant in the T <br /> fill soils. Lead, other metals, and Polycyclic Aromatic Hydrocarbone 1 � <br /> (PAHs) were also detected in scattered eamples of fill material Arese � <br /> above MTCA Method B cleanup levele (Residen[ial) were removed in the <br /> Demolition and Site Remediation contract for &verett Station. The eoil r <br /> hae been [ested and remediated and the site is considered to not b�: j <br /> contaminated under Model Toxice Control Act (MTCA) Method 8 and the <br /> interim TPH policy. �% <br /> Although areae vrcre detezmined to heve been remediated baeed on 1 <br /> repreeentative eamplin acroee these areae, it ia conceivable that <br /> pockete of contemination could be discovered durina traneit proiect T ' <br /> conetruction, and materials to be removed from the site. In addition, � <br /> a� material ta be removed from the site, unleas otherwiee directed by <br /> the Owner's Representative, shall be s[ockpiled and teeted (MTCA Method <br /> A Reeidential) and managed in accordance with the applicable etate and � <br /> local WSDOE requirements and PCS uidance. <br /> 1(3) Cleenup Levels <br /> Cleanup levels for excavated eoils that are to be removed from the site T � <br /> are baeed on rersidential cleanun levels for MTCA Method A. Cleanuo i <br /> level• for contaminants of concern are: <br /> 1. TPH (gasoline) , S00 mg/kq T <br /> 2. TPH (dieael and others) , 20o ma/ka 1 <br /> 3. Totel PAHe,1.0 mg/kq <br /> 4. Lead, 250 mq/ka. '" <br /> 5. Total Metals (eee WAC173-340-7�0, table 2) <br /> Cleanuo levels foz excevated soile that are [o remain on eite are based .- J <br /> on residential cleanup levela for MTCA Method B. Cleanup levele of , � <br /> concern are: <br /> i <br /> 1. TPH (qaeoline) , XXX ma/ka •- � <br /> 2. TPH (dieeel and othere) XXX ma/ka ' <br /> 3. Total PAHs, %%X mg/ka ' <br /> 4. Lead, XXX mg/kg <br /> 5. Total Metale XX7CX � <br /> Soils encountered havinq concentrations above theee cleenup levele will <br /> be ac[ively remediated as deecribed in Section 1(4) . <br /> 1 (4) Soil Management � - <br /> Roile will be excava[ed to meet the required rades for buildinq <br /> foun�la[ion, for utility and etorm drain trenches, and for the detention � <br /> vault as called for in the proiect plans. Phyeicel artd chemicsl <br /> ecreening of excavated eoils will be requited prior to haulin i[ off <br /> eite. Material that is geotechnically suitable shall be etockpiled <br /> separa[ely, and tested only at the discretion of the Owner�s � <br /> Repreeentative. Soil excavation handlin and diepoeal ehall be <br /> conducted ae epecified in the Decision Tree ehow�n on Fiaure 1 IThis <br /> figure can be found at the end of this sectionl The followina <br /> decieione ehall be made by the owner'e Repreeentative• ' <br /> Divieion 2 Pege 12 ' <br /> Hverett Station OS/12/00 <br /> H:\Jobe\97093\TNANS\&NG\SPECS\100lcd\Stree[ si[e\9BSPEC]RI.docC.}PpCJi6�'S�e <br /> ��� ��T ��z ��� S <br /> n` 3 <br /> � <br />