Opening of Quotes - Laurel Woods Drainage Improvements Proj No. 121-007 - Selge Construction Co., Inc.

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Weaver Consultants Group 9 5.6 Groundwater Concerns Depending on the depth of the sewer and structures, dewatering may be required to remove and replace very loose soil conditions or improve subgrades prior to placement of pipe . However, whenever a rain event occurs during construction, water flow in the creek can be expected and construction activities should be managed to account for these events and protect completed work. If minor dewatering is required in silty areas, it can be accomplished by pumping from sumps installed at the bottoms of the excavations. 5.7 Excavation Slope Stability Our exploration did not include a detailed analysis of slope stability for any temporary excavation condition. Based on the soil conditions encountered at the boring locations, temporary shallow construction excavations are expected to expose fine sandy soils. For such conditions, it is our opinion that shallow temporary excavations can be cut with side slopes of 1.5H:1V. However, current OSHA standards must be met and may be more restrictive. Hence, if safe side slopes cannot be maintained due to loose granular soil conditions, then the excavation sides should be flattened, shielded or shored in accordance with current OSHA standards. The Contractor is solely responsible for constructing and maintaining stable excavations. Additionally, soil should not be stockpiled immediately adjacent to the top of the excavation. 5.8 Limitations WCG has prepared this report in accordance with generally accepted geotechnical engineerin g practices to aid in the evaluation of the site subsurface soils. No other warranty, expressed or implied, is made. The scope of this report is limited to the specific project and location described herein, and our description of this project represents our understanding of the project. The geotechnical engineering analysis and foundation recommendations presented herein were developed based on the information obtained during the subsurface investigation. It should be noted that the borehole data reflects the subsurface conditions only at the specific locations designated on the borehole logs, and that soil and groundwater conditions could vary widely throughout the site. If variations do appear during construction activities, it may become necessary to re-evaluate the recommendations of this report. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning this report, or if we may be of any additional service, please do not hesitate to contact us.