Tau ntau xyoo, David Benzschawel, ib tug engineer civil rau lub nroog Madison, khaws ib daim ntawv qhia loj hauv nws lub chaw ua haujlwm. Nws piav qhia txog kaum ob qhov chaw pov tseg thiab cov pov tseg keeb kwm nyob ib ncig ntawm lub nroog. Benzschawel, uas tam sim no so haujlwm, tau tshuaj xyuas cov chaw tawm ntawm nws tus kheej thiab sib sau cov ntaub ntawv keeb kwm kom paub seb dab tsi tau faus ntawm txhua qhov chaw.
Ntawm ntau qhov chaw, nws pom cov hmoov tshauv thee.
Ntau lub chaw ua si hauv nroog thiab chaw kis las yog qhov chaw pov tseg cov hmoov tshauv, raws li Benzschawel's sleuthing. Ib lub pob pov tseg tau nyob ntawm ntug dej ntawm Yahara River ntawm Isthmus thiab, raws li Benzschawel cov ntaub ntawv khaws cia, yog lub chaw khaws cia rau cov hmoov tshauv, suav nrog cov slag los ntawm hauv qab ntawm boilers thiab ya tshauv los ntawm smokestacks.
Cov cuab yeej cuab tam ntawm cov av tshauv pov tseg tau yooj yim pom meej rau cov neeg ua haujlwm hauv nroog thiab lwm tus uas nquag khiav hla cov khoom siv thaum ua haujlwm ntawm cov dej num lossis npaj ntau ntau rau kev tsim kho.
Nyuam qhuav pib lub xyoo no, Madison tshem tawm 10,600 tons ntawm cov khoom ntim, feem ntau yog cov hmoov tshauv thiab cov cinders, los ntawm ib lub tsev nyob rau ntawm 700 block ntawm East Washington Ave. uas nyuam qhuav dhau los ua lag luam tsheb. Cov khoom siv tau dhau los ua kev txhawj xeeb vim tias nws muaj peev xwm ua kom muaj kab mob. Nws raug thauj mus rau qhov chaw pov tseg.
Ib qhov chaw ntawm cov hmoov tshauv thee yog Blount Street fais fab nroj tsuag, ua los ntawm Madison Gas & Electric txij li xyoo 1902. Cov nroj tsuag tau hlawv cov thee mus txog rau xyoo 2011. Tam sim no nws hlawv roj, ntoo khib nyiab thiab lwm yam khoom siv.
Steve Kraus, tus kws tshaj lij rau kev siv hluav taws xob, hais tias cov nroj tsuag tsis tsim cov ntoo tshauv tib yam li cov nroj tsuag loj nyob rau sab qab teb Wisconsin. Thiab vim yog hom thee hlawv, cov ntoo tshauv tsis sib tov zoo li cov cement.
Tseem, nws hais ntxiv, txog 36 tons ntawm tshauv los ntawm cov nroj tsuag tau rov qab siv dua hauv thaj chaw tom qab dhau los ntawm 1985 thee ash txoj cai dhau los, ib feem ntawm kev tsim kho txoj kev loj 12 ntawm Middleton thiab Sauk City hauv xyoo 1990. Cov seem tau muab pov tseg.
Tab sis Kraus tau hais tias nws yog ib qho kev coj ua rau ntau xyoo ua ntej xyoo 1985 txoj cai rov siv tau zoo rau MG & E thiab lwm yam lag luam, xws li Oscar Mayer, kom pov tseg cov tshauv raug cai hauv ntau qhov chaw qis, marshy ntawm Isthmus thiab lwm qhov hauv nroog.
Kraus hais tias "Kuv paub tseeb tias rau qee qhov ntawm Isthmus thiab txhua qhov chaw muaj qhov chaw qis, lawv tau pov rau hauv cov hmoov tshauv thiab cov khib nyiab," Kraus hais.
Txawm hais tias cov tshauv tau paug Madison cov dej tsis paub meej.
Chromium-6, ib qho hlau tsis muaj zog, tau kuaj pom nyob rau theem qis heev hauv 14 ntawm Madison lub 22 lub qhov dej hauv nroog hauv kev sim uas tau pib xyoo 2011. Thaum noj cov qib siab, nws tau txuas nrog kev tshawb fawb txog kev mob plab. Nws muaj nyob hauv cov hmoov tshauv, ntawm lwm qhov chaw.
Joseph Grande, tus thawj saib xyuas dej zoo rau Madison Water Utility, tau hais tias cov khoom siv hluav taws xob tau thov los ntawm Wisconsin Geological thiab Natural History Survey. Kev Tshawb Fawb Kev Tshawb Fawb tau txheeb xyuas cov pob zeb los ntawm cov dej hauv dej, pom tias lawv muaj chromium thiab xaus lus tias cov pob zeb tuaj yeem yog qhov muaj peev xwm ntawm ntuj.
Tab sis tsab ntawv ceeb toom tsis tau hais txog lub peev xwm rau tib neeg cov peev txheej, xws li plating cov nroj tsuag thiab faus thee tshauv.
Grande tau hais tias cov qhov dej ntawm Isthmus, qhov chaw uas muaj cov kab mob zoo li no tau pom nyob rau theem siab ntawm lub aquifer, yog cov hlau ntawm qhov tob mus txog 200 ko taw, hauv qab ntawm thaj chaw uas muaj kev sib kis yuav tshwm sim.
Tab sis Kenneth Bradbury, tus kws tshawb fawb txog hydrogeologist nrog Kev Tshawb Fawb uas kawm Madison lub aquifer, tau hais tias tons ntawm faus thee tshauv yog "tsis yog ib yam uas koj yuav txiav txim siab tag nrho" raws li qhov muaj peev xwm ntawm cov hlau.
Bradbury tau hais tias "Nws yog qhov tseeb tiag," Bradbury hais.
Grande tau hais tias qhov chaw siv hluav taws xob paub txog qhov muaj peev xwm ua paug los ntawm faus thee tshauv thiab tau sim rau molybdenum hauv qee qhov dej. Cov kev sim no yuav nthuav dav mus rau txhua qhov dej hauv xyoo tom ntej, nws hais.
Zaj dab neeg no raug kho lawm. US Geological Survey qhov kev soj ntsuam ntawm pob zeb los ntawm Madison aquifer pom chromium, tsis yog molybdenum, raws li zaj dab neeg tau hais tseg.
Cov nonprofit Wisconsin Center rau Kev Tshawb Xyuas Xov Xwm (www.WisconsinWatch.org) koom tes nrog Wisconsin Cov Xov Xwm Zej Tsoom, Wisconsin Cov Xov Xwm Rau Pej Xeem, lwm cov xov xwm tshaj tawm thiab UW-Madison Tsev Kawm Ntawv Xov Xwm thiab Kev Sib Txuas Lus. Txhua yam haujlwm tsim, tshaj tawm, tshaj tawm lossis tshaj tawm los ntawm Lub Chaw tsis tas yuav cuam tshuam cov kev xav lossis kev xav ntawm UW-Madison lossis ib qho ntawm cov koom tes.
Rov luam tawm peb cov ntawv dawb, hauv online lossis luam tawm, raws li daim ntawv tso cai Creative Commons.
Tsis kam, ncua & disuaade. 'Xim'. MOI?! Xav tau kev kawm ntxiv. Tsis muaj dab tsi pom ntawm no. Txav mus tam sim no.
Lub Xeev Wisconsin muaj mob ib puag ncig! Tsis tas li ntawd, huab cua peb ua pa tsis huv, cov zej zog ua liaj ua teb tau ua rau peb cov dej txias txias thiab peb cov dej ntws ua paug nrog cov av thiab nitrates, thiab tag nrho cov ecosystem poob qis. Nws paub zoo tias Lub Tsev Haujlwm Saib Xyuas Kev Noj Qab Haus Huv tsuas yog kev tswj hwm kev nom kev tswv thiab qhov muag tsis pom qhov tshwm sim tiag tiag hauv lub xeev no thiab kuv liam rau lawv (thiab cov neeg tsim cai lij choj) rau stat cov kab lis kev cai ntawm kev tswj hwm lax hauv nws nyiam kev lag luam tshaj cov pej xeem. kev nyab xeeb thiab peb ailing ecosystem.