3003 W CASINO RD BLDG 40-56 Geotech Report 2018-01-02 MF Import

mixture of sandy silt, wood fragments and organic silt. Laboratory tests showed organic matter contents of less than 1 I percent (see Table B-5 in Appendix B). However, visual examination of materials encountered during the drilling process indicated some zones of higher organic content, including occasional 3-foot thick pockets where more than 50 percent organic materials were estimated. The majority of these materials was loose except in Boring B-4 where the organic soil was medium dense. Construction debris such as pieces of concrete and asphalt pavement were encountered in the upper portion of the fill. Mix of soils and organic matters like logs, twig and pine needles were generally found in the middle to portion of the fill. Lou of drill mud in the amount of 5 to 25 gallons occurred in all of the 5 borinp drilled with mud rotary drilling technique (Boring 112-91, 113-91, 114-91, BS-91 and 87-91). In general, the loss occurred near loose soils or debris (like tree lop and branches). The loss could be indicative of voids in the fill. A void was found in Boring B-4-414 of the previous investigation. The void was at a depth of 53 feet. The boring also exhibited caving from approximately 20 to 45 feet during drilling. Mud drilling technique was also used in that particular exploration. Caisson installation records for the 1989 expansion (at the northwest corner of the existing building) indicate difficulties due to sloughing and caving of holes. Old trench baekfill, concrete pipes (some groated), boulders and high percentage of wood fragments were encountered during construction. Steel pipe casing was used during construction of the caissons to support the hole. Some analytical testa were conducted to evaluate the corrosion potential of the subsoils. The tests included resistivity and PH determinations. Based on published literature the bat results indicate moderately low corrosivity conditions. The glacial soils beneath the fill materials include glacial till and outwesh. The former is a silty fine to coarse and and the latter is a and or gravel. These glacial deposits are very dense. The outwash soils are sally found below till, however, the latter is thin or absent in the north central area of the. expansion close to the once bottom of the ravines. in some borings the till was somewhat weathered in the upper 2 to 4 feet. ar005.00695. 016\acoa0700.oW 00695.509.016 5