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copy <br /> Delta <br /> Environmental <br /> IR/I Consultants, Inc. <br /> 1801 Highway 8, Suite 114 <br /> St. Paul, MN 55112 <br /> 612/636-2427 <br /> FAX:612/636-8552 <br /> August 31, 1989 <br /> Minnesota Pollution Control Agency <br /> 520 Lafayette Road <br /> St. Paul, Minnesota 55155 <br /> Attention: Ms. Linda Tanner <br /> Subject: Drilling Update <br /> Kenzie Terrace <br /> St. Anthony, Minnesota <br /> Site ID #LEAK00000407 <br /> Delta No. 10-89-190 <br /> Dear. Linda, <br /> I am writing to update you as to drilling progress at 2601 Kenzie Terrace in St. <br /> Anthony, Minnesota. Delta Environmental Consultants, Inc. and Geotechnical <br /> Engineering Corporation mobilized to the site on August 22, 1989 with the purpose <br /> of installing three-monitoring wells. Drilling locations are shown on the attached <br /> sketch. <br /> Soil samples were retrieved during drilling operations and scanned with an hNu <br /> photoionization detector for the presence of organic vapors in monitoring well MW- <br /> 1. Organic vapors ranging from 2 to 5 parts per million were detected at depths <br /> ranging from 20 to 45 feet. Bedrock was encountered at 48 feet. The monitoring <br /> well was set at 48.5 feet. On August 28, 1989, only 2.2 inches of water were <br /> measured in the monitoring well. <br /> Two soil borings were advanced along Kenzie Terrace. Soil borings SB-1 and SB- <br /> .2 were advanced to depths of 47 feet and 41 feet, respectively. Organic vapors were <br /> not detected in either soil boring. Bedrock was not encountered in soil boring SB- <br /> 1, whereas drilling refusal occurred at 41 feet in soil boring SB-2. <br /> Installation of monitoring wells in the unconsolidated soils at Kenzie Terrace is not <br /> possible. It is proposed that a monitoring well be installed in the former <br /> underground storage tank area. This monitoring well will enable evaluation of <br /> ground water quality in the bedrock aquifer. Prior to sample collection, the <br /> monitoring well,will be pumped with a submersible pump such that eight to ten well <br /> volumes are evacuated. Pumped water will be disposed to the sanitary sewer system. <br /> Following development, ground water will be sampled and submitted to PACE <br /> Practical Solutions to Environmental Concerns <br />