10-10-1988 - Agenda Packet City Council - regular meeting

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Delta Environmental Consultants, Inc. 1801 Highway 8. Suite 123 St. Paul. MN 55112 612 636-2427 June 15, 1988 1e Minnesota Department of Health Water Supply and Engineering Department 717 Delaware Street SE Minneapolis, MN 55440 Attention: Mr. Roman Koch Subject: Monitoring Well Installation Washington Scientific Industries, Inc. Long Lake, Minnesota Delta No. 10-87-200 Dear Mr. Koch: As part of our investigation of the subject site, we are proposing the installation of a 50 foot monitoring well. We will be drilling through a confining unit between 10 and 25 feet below the ground surface. We are seeking a permit from your department to install this well. Details of our proposal are discussed in the enclosed report entitled "Proposed Work Plan". The monitoring well, designated MW-10, will be installed by GME Consultants, Inc. (GME). Their proposal for the well installation is included in Attachment I. We are scheduled to begin well installation on June 27, 1988. As summarized in the enclosed report, MW-10 (the 50 foot well) will be constructed with a two inch diameter stainless steel -screen and two inch low carbon steel riser. The well will be finished at a depth of 50 feet. We propose to drill the first 35 feet with a 6 1/4 inch I.D. hollow stem auger with rubber seals between auger flights. The remaining 17 feet will be drilled with a 6 1/4 inch tri-cone bit and bentonite drilling fluid. The reason for selecting this drilling method is that this is a known area of solvent contamination as noted in the enclosed report. We believe that this drilling method will enable us to seal off the above strata and effectively sample the 45 - 50 foot inter-1. For your information, a boring (MW-7) was drilled very near the location of the proposed :ell. The log of this boring is included in Attachment 2. Pracncai SOlutton7 to Envi onmental Co wems