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WASHINGTON SCIENTIFIC INDUSTRIES <br />Remedial Action Plan <br />Long Lake, Minnesota <br />Delta No. 10-87-200 <br />1,0 INTRODUCTION <br />1.1 Purpose and Scooe <br />The objective of this report is to present a Remedial Action Plan (RAP) for the clean up of <br />contaminated soil and ground water at the Washington Scientific Industries (WSI) facility located in <br />Orono, Minnesota. The report also presents data obtained from three newly installed monitoring wells <br />at the site. The new wells have allowed us to further define the vertical and horizontal extent of <br />contamination. <br />Based on site conditions which have been cutline in Delta Environmental Consultants, Inc. (Delta) <br />reports entitled "Organic Solvent Contamination Investigation", December 23, 1987 and "Proposed Work <br />Plan", May 24, 1988, we recommend that a recovery trench system be installed to remediate- <br />contaminated ground water identified at the site. The trench will contain a large diameter sump <br />which will be equiped with a single total fluids submersible pumping system. Contaminated water will <br />be routed from the sump to an aeration system for pretreatment of volatile compounds and then be <br />discharged directly to the sanitary sewer system. <br />1.2 Site Description <br />Washington Scientific Industries is located on the south side of the highway, immediately west of the <br />city of Long Lake, Minnesota. The site is within the city limits of Orono and is located in the SW <br />1/4, NW 1/1" Section 33, TI I8N, R23W. The WSI facility is shown in the United States Geological <br />Survey topographic map in Figure 1. <br />2.0 BACKGROUND <br />2.1 Previous Work <br />Fourteen monitoring wells have been installed at the WSI facility in Orono, Minnesota. The <br />monitoring well locations are shown in Figure 2. The results of the initial phase of this <br />investigation are presented and discussed in the Delta report entitled "Organic Solvent Contamination <br />Investigation", December 23, 198' <br />After completion of the initial site report, one additional monitoring well was inst_"Cd and <br />additional round of sampling was conducted. Results of the well installation (MW-4D) and sampling <br />are discussed in the Delta report entitled "Proposed Work Plan", May 24, 1988. Volatile organic <br />