711 112TH ST SE BASE FILE 2018-01-02 MF Import

�: ` pve�ic woRirs ;; MF.MORANUUM TO: Tom'I'hclford FROM: Dan Mathias UA7'1:: Pcbruary 7, 2003 SUI3,IGCT: 7'h Avc SE Swalc In Deccmbcr, 1 rcceivcd somc laborulory dalu from Duvc Tylcr rcgurding sedimcnt sumpling at a swalc at 71 I I 12'h SI SE. This swule Irculs stonnwatcr tvnoff Gom 7'h Avc SE nnd is maintaincd hy thc City of Evcrcu. Thc tcst rcsuh� hy Associ�ucd Garth Scicnccs indicalc onc sedimcnl sample excecded thc method A Modcl Toxics Control Act cleanup levcl for henza(a)pyrcne. Thc MTCA requires Ihat owncrs und operaton must rcpon rcicases of hazurdous subsiunccs duc to past practices within 90 days of discovery. Davc Tyler rcceivcd thc Associated Earth Scicnccs rcport on Novemhcr I5, 2002. Therel'ore, �he City of Everctt must decide by Fcb I5, 200:i if this discovcry is reportublc to Ihc Dcpt. of Gcology (DOE). DOE's policy 101 s�a�es thau rcicase� do not havc io bc rcportcd if using oun c�st professional judgmcnt, Ihc rcicasc dc�cs not posc a Ihrcat lo human health or thc cnvironmcnt. In my Ixst professionul judgmcnl, thc Icvcl of contaminunls in thc 7'" Avc SE swalc docs noi posc a thrcat lo hmnan hcath or thc cm�ironmcnl, nor should it be rcponcd to DOE. This is bascd upon thc following I'actors: � Swales arc designed io remove pollutants in stonnwatcr runoff. Therefore, an accumul.uion of contaminanls abovc buckgmund conditions is expcctcd if Ihc swalc functions ax dcsigncd. • Thc swalc discharges into Ihe east fork of North Crcek. Although the Associated Garlh Scicnccs rcporl docs not contuin a map showing thc location of thc Iwo samplcs, ihc rcport idcntifcs thc samples as drainage swalc scdiment samplcs. Thcreforc, thcrc is no indic:dion of elcvatcd levels of hcnzo(a)pyrcnc in Norlh Crcck. • North Crcck is not uscd for wntcr supply purposcs. • The tiwalc is fully vcgc�utcJ along its cntirc Icngth. Thcrc wcrc no app��rcnt ❑ccumulations al'rcu�olcunrhascd residuc wilhin thc swalc during my lir.ld in��,rrliun un Dcrcmhcr 2. _'002. �„�„��:��,