A5'COM

September 24, 2010

Ms. Michele PisterziAT&T2427 Union StreetBlue Island, IL 60406

AECOM303 East Wacker Drive, Suite 900Chicago, Illinois 60601

312.938.0300 tel312.938.1109 fax

RE: Radiological Survey of Right-of-Way Utility ExcavationPermit No.: 774296416Permit Address: 458-460 E. Illinois StreetAECOM Project No. 60163572

Dear Ms. Pisterzi:

Pursuant to conditions specified in a permit (see attached) issued by the City of Chicago, radiationmonitoring was required to be performed at the above referenced site. AECOM provided the requiredradiation surveillance on September 21, 2010 for the excavation and removal of the existing light polefoundation and its replacement with a new deeper foundation at the same location. The foundationexcavation occurred within the sidewalk on the northwest corner of the intersection of E. Illinois Street and N.Peshtigo Court (refer to attached drawing and photo). The excavation was approximately 6 by 8 feet at thesurface and extended to a maximum depth of 12 feet.

Radiological surveying was performed for the concrete and soil material removed for the excavation. Themonitoring revealed no indication of soil material above the clean-up threshold established by the U. S.Environmental Protection Agency (USEPA) for the Streeterville area of Chicago. The USEPA cleanupthreshold for Chicago's Streeterville area is 7.1 picocuries per gram (pCilg total radium (Ra-226 + Ra-228).Gamma radiation count measurements for the project were made using a Ludlum Model 2221 survey meter(Serial #176944) and unshielded 2 x 2 Nal probes (Model 44-10). For the instrument used, the gamma countindicative of the 7.1 pCi/g threshold is 17,522 counts per minute (cpm). Gamma readings and/or backgroundat the surface was approximately 6,500 cpm. Gamma readings for the excavated soil materials ranged from5,500 to 8,600 cpm with a maximum of 10,240 cpm. Thus, there was no indication of an exceedance of theUSEPA cleanup threshold.

Finally, as part of the permit conditions, this letter has been forwarded to:

Chicago Department of EnvironmentAttention: Ms. Rahmat Begum30 North LaSalle Street, 25th FloorChicago, Illinois 60602

Please contact us with any questions you have regarding this letter or the reported results.

Regards, IJ ()~-Z/~-Steven T. NewlinSenior Project Engineer

Steven C. Kornder, Ph.D.Senior Project Geoscientist

cc: William Nolan, John Burns Construction CompanyRahmat Begum, Chicago Department of EnvironmentVerneta Simon, USEPA

Attachments: Permit, Drawing and Photo

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Signed byOcpamt1cnt ofEnvironm~t <z.2:~;: 4 B~Dale ?J~jlJ2 ~

I have ~b!wed Ind lIlldctsacId me dOeUlnClUS., mliltl::tiMd by theDeplnml 1$orEnviromneat. rep.rdlng CIlvironmel'lll1 contamination of thesiteand adjllCCl t right-of-way.f\IrdIer. JWUl allUre thataJl wotfc It the JUbject si~ Iud adjacent rigbtoO(.'W y. IQd :HI)'

mcmuoring requirN indudina hutJlQt limited to radialion monitoring, will b performed In amanner that is proteCtive ofbuman bcal\b end~ cnviromnent and incompl Il1U with allllJlPlicable local, stale, and r.... laW$, nates, and rqularions. eapecially tIUl epenaifJine towotkcr safetyand was~ mausement. I willM5Wl: !hal~ nmilisof~y ta<.~monitDring and/or Stln'cying Cl:Ifldumd shaIJ beprovided to the Department \ ~ Ertvitonmclllwithin two (2) wccbof theireompJetion. trany elevated levels ofnwfiolla{v materi.1 aredecettcd, I willimmediately I;Ol)taet the United States Envirolll11CftUlI~ mA~ It (100) 424-U01. .

SigDmlre __~"';P:..JLA"'·~:tUl~ho..6;l~6""·JI.-- _

Name (prlnt) \"\\t,.ht,le P\~~T'~L _

CITY OFCHICAGO DEPARTMENT OFENVIRI INMENTFORMNO. DOE-ROW.Ol

05:39;27a.m. 9-0~-2010

Notice ishtrebygiven thatthe siteyou bave requested information on is ret Irded with the Cityof Chicago [)epanmmt of linvironment U pol.CI\datly havingenvironmentai cc»q)Jination ontilesi~ and adjacent rightoOf '"Y. This environmental contamination could II'C5Cnta Ihrelttohuman health and nfery inconnection with work performed at the sitt;, or in tielIdjacenl rigflt~

of-way, If~ saf'egual'dure not employed.

A file containing detailed information regarding me aforcmmtiuncd mvirocu entaleomaminalkln is avcU1ab1c for ~iew II the DepaI1metlt or E"vifoDmCnt II 3{ N. LaStlle St.,231b floor, ChiQgo.lUinoil 60602 cklrin& normal bu$iAeu hours(1:30AM- ':30 PM.Monday through Friday). COI_ RhImat Begum at (31Z)744-3152 for &1\ I lpOintmcAt. The,file mustbe~iewed aDd theremainder of this fonn eQmpltted befm: the po "It can be imled.Pkuc ACJk t"at for some Jocattou, Iddltioul hcaJtbanll safety prtM:edltf 'lDay berequltect by ....

Please return Ihis completedform to !hl! City ofCl.jago DepartmtlllofTransporcarion ,,30 N.laSallt St., Room 110I. Chicago, 11Ii1lOi$ 60602 during normal business OOIll'S (8;]0 A 1 · 4:)0pM. Monday Ihrougb friday). JaMI.

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