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tw�n c�tti+ test�nq corporat�on 0 662 CROMWELL AVENUE ST. PAUL, MN 55114 PHONE 612/645-3601 November 26, 1991 � - � i � I Rick's Super Value 3333 Shoreline Drive Navarre, MN 55392 ��, 2 2991 Attn: Rick Bloomquist Subj: Addition to Rick's Super Value Navarre, Minnesota TCT #4220 92-1014.01 At the request of D J Miller Construction, we have performed observations of soils within the subgrade of the drive-parking area at the loading dock on the western side of the addition to the Rick's Super Valu. The purpose of this letter is to summarize the results of our observation and recommendations provided to project personnel at the construction site during the time of our visits. Within this area, the construction will consist of a 6" cast-in-place concrete slab placed over 6" of sand fill. The slab will be utilized for parking of tractor-trailer rigs at the loading dock. Available information regarding subsurface soil conditions in this portion of the site indicates the soils would probably consist of previously placed fill which may overly somewhat compressible topsoil. On October 21, 1991, we made our initial observation of soils within the referenced area. During this visit, we observed that the subgrade soils consisted of previously placed cohesive fill which ranged from moist to wet. The majority of the subgrade soils were in a somewhat unstable condition as evidenced by rutting and deflection which occurred during the passage of construction equipment. During our visit, we indicated to project personnel that in order to provide a stable subgrade and eliminate the potential for settlement of the on- grade concrete construction, it would be necessary to remove all previously placed fill as well as topsoil which may underlie this fill system. We also indicated that if the risk of some potential settlement of the concrete construction is acceptable to the property owner, it may be feasible to provide a suitable stable subgrade within the upper portion of the subgrade profile by means of a less extensive excavate/refill system. We indicated that improvement of the surficial portion of the subgrade soils could be achieved using either of the following two alternatives: Alternate One. This alternate would consist of excavation of the existing subgrade to a depth of about 3-1/2' below planned subgrade. The exposed subcut should then be test rolled with construction equipment in order to determine if additional subcut would be required. Planned subgrade elevation should then be reestablished by placement of a cohesive type fill. The fill should be compacted to 100% of the Standard Proctor density (ASTM:D698). In addition, the fill must be placed at a moisture content at or below the optimum moisture AS A MUTUAL PROTECTION TO CLIENTS,THE PUBLIC AND OURSELVES.ALL TWIN CITY TESTING CORPORATION REPORTS ARE SUBMITTED AS THE CONFIDENTIAL PROPERTY OF CUENTS. AND AUTHORIZATION FOR PUBLICATION OF STATEMENTS.CONCLUSIONS OR EXTRACTIONS FROM OR REGARDING OUR REPORTS IS RESERVED PENDING OUR PRIOR WRITTEN APPAOVAL.