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.',.:’'.-'"iir‘>‘:mm'mwmmmm*5i . •:»i <br />N%*-»g I <br />I- <br />-V ■ <br />r ■■ : V'f <br />■ AM <br />■ 1 <br />V <br />ikiv h.s-i <br />. - ■■ :;i <br />A, <br />, J‘ ■■••#»' •> <br />n.v <br />•»•« «*4k ' <br />. ••> * <br />. ^T» - <br />j :■*• <br />*; <br />V. . <br />;= ■'■ ■■ r'. <br />S»".1. <br />■l V: <br />r-•'• =■ <br />•f?' <br />■a <br />^aflttlMafiiifaa <br />WASHWCtON SCIENTIFIC INDUSTRIES <br />RtaedUl Actios Fisa <br />Loaf Lake, Miaaosots <br />Delta No. 10-17-200 <br />UL-flfraOPUCTIQf* <br />1.1 Faraoit ^md Scono <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 (^I) facility located in <br />OronOf 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 horiaontal extent of <br />conmmination. <br />Based on site conditions which have been outline in Delta Environmental Consultants, Inc. (Delta) <br />reports entitled 'Organic Solvent Conmmination Investigation*. December 25, 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 DescrintFon <br />Washington Scientific Indusulc? i« 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 1/4, Section 33, T1I8N, R23W. The WSI facility is shown in the United States 3eological <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 er. tied 'Organic Solvent Contamination <br />Investigation", December 23, 1987. <br />After completion of the initial site report, one additional monitoring well was installed and an <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