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<br /> <br /> <br /> <br />ooits a <br />focusing on <br /> <br /> <br /> <br />on <br /> <br />presence of volatile organic <br />range organics (DRO) within glacial aquifer. Trichloroethylene was identified at <br />concentrations exceeding its Minnesota Department of Health (MDH) recommended exposure <br />limit of 5 micrograms per liter (ugIL) at two glacial wen locations - MW-2 (330 to 360 ugIL) <br />located near the northeast corner of the former Midwest Motor Express, .and in MW-5 (98 to 68 <br />uglL) located near the southeast comer of Al Truck Repair. DRO contamination in the glacial <br />aquifer was also identified in several of the new glacial monitoring wells. During an. earlier <br />investigation chlorinated solvents were also identified in the perched groood water unit in two <br />nearby geoprobes on the Indian Head parceL In one geoprobe trichloroethylene and cis-1 ,2,- <br />dichloroethylene were identified at concentrations of 580 uglL and 350 ugiL, respectively, and in <br />the other geoprobe trichloroethylene was identified at a concentration of77 uglL. <br /> <br /> <br /> <br />The Supplemental Report concludes that the ground water contamination detected in the glacial <br />aquifer poses minimal environmental. risk based on the lack of potential ground water receptors <br />in the glacial aquifer, but recommends that additional environmental investigation be considered <br />at properties where the trichloroethylene concentrations exceed its MDH recommended exposure <br />limit. <br /> <br />The Supplemental Report is hereby approved subject to the modifications presented in <br />Attachment B. Please note the standard disclaimers in Attachment A. If you have questions <br />regarding this letter please contact me at (651) 297-5573 or Gerald Stahnke at (651) 297-1459. <br /> <br />Sincerely, <br /> <br />~~;L.J;~ <br />Thhard M. Jolley, PG <br />Senior Hydrogeologist <br />V olootary Investigation and Cleanup Unit <br />Supe\rfund and Emergency Response Section <br />Remediation Division <br /> <br />RMJ/jmp <br /> <br />Attachments <br /> <br />cc: Cathy Bennett, City ofRoseviUe <br />Steve Heikkila, DPRA <br />Alan Baumann, U.S. EP A, Regjon V <br /> <br />'\ <br />\ <br />