Agenda - Council - 10/26/2021 - Laserfiche WebLink

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3.5 OSHA Soil Classification The soil encountered in the borings consisted of poorly graded sand corresponding to the ASTM Classifications SP. The soils identified in the boring will generally be Type C soils under Department of Labor Occupational Safety and Health Administration (OSHA) guidelines. An OSHA -approved qualified person should review the soil classification in the field. Excavations must comply with the requirements of OSHA 29 CFR, Part 1926, Subpart P, "Excavations and Trenches." This document states excavation safety is the responsibility of the contractor. The project specifications should reference these OSHA requirements. 4.0 DISCUSSION AND RECOMMENDATIONS 4.1 Proposed Construction This project will include improving Sunwood Drive from its intersection with St. Francis Boulevard (aka Highway 47) to its intersection with Waco Street and Waco Street from its intersection with Sunwood Drive and extending north to about the intersection with 150th Avenue NW. Total length of the alignment was estimated to be about 2,500 feet. Based correspondence with the City of Ramsey we understand that street improvements could include completely removing and replacing the existing pavements or a full -depth reclamation. We further understand that no sanitary sewer or watermain utilities will be installed as part of this project. However, the city is assessing the existing sanitary sewer and storm sewer pipes for damage and is anticipating that some repairs will likely be required. Fixes, if any, will likely be spot fixes and not wholesale replacement of the pipe networks. We anticipate that site grading will consist of earthwork necessary for roadway reconstruction and we do not anticipate any significant changes in the roadway alignment or roadway grades. Cuts or fills involving permanent grade change, if any, are assumed to be less than 1 feet. Invert elevations or pipe burial depths for storm sewer sanitary sewer or watermain utilities are anticipated to be on the order of 5 to 10 feet. We were not provided any information regarding traffic volumes such as Average Annual Daily Traffic (AADT) counts or vehicle distribution for the roadways. Information obtained from the Minnesota Department of Transportation Traffic Mapping Application website indicates that the 2019 traffic count(s) along Sunwood Drive was 1750 vehicles per day. Information regarding vehicle distribution was not provided. For the purposes of this evaluation, we assumed these roadways are used mainly by automobiles, light trucks and school buses with some heavier vehicles such as garbage trucks and UPS or FedEx type delivery vehicles. Based on an AADT of 1750 vehicles we estimate the pavement are subjected to about 265,000 to 270,000 Equivalent Single Axle Loads (ESAL's) over a design life of 20 years. Please note the estimated ESAL's were based on 2019 traffic data and have not been adjusted for any future growth. Changes in the nature, design, or location of all or parts of this project may occur. Likewise, if the proposed traffic volumes exceed these values we should be informed. Additional analyses and revised recommendations may be necessary. 5