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

Home

• Preparing soil boring logs describing the materials encountered and the results of groundwater level measurements. • Preparing an engineering report describing soil and groundwater conditions and providing recommendations for roadway construction/reconstruction. 1.5 Documents Provided We were provided with a 10-page Request for Proposal (RFP) prepared by the City of Ramsey. Very briefly, the RFP included but was not limited to; a description of the project, a scope of services, soil boring requirements, contractual requirements, schedule and a bid form. The RPF also included soil boring location sketches. The plan sheets showed the proposed streets slated for improvement and provided stationing at the proposed boring locations. 1.6 Locations and Elevations The boring and core locations were selected by the City of Ramsey and marked in the field in advance our field work. The approximate boring and associated core locations are shown on the Figure in the appendix. The boring location sketch is the figure provided in the RFP. HGTS obtained the GPS coordinates and ground surface elevations at the soil boring locations using GPS technology based on the Minnesota County Coordinate System. GPS coordinates and the ground surface elevations are shown on Figure 2 in the Appendix. 2.0 FIELD PROCEDURES The 6 standard penetration test borings were advanced on September 13th and 14th, 2021 by HGTS with a rotary drilling rig, using continuous flight augers to advance the boreholes. Representative samples were obtained from the borings, using the split -barrel sampling procedures in general accordance with ASTM Specification D-1586. In the split -barrel sampling procedure, a 2-inch O.D. split -barrel spoon is driven into the ground with a 140-pound hammer falling 30 inches. The number of blows required to drive the sampling spoon the last 12 inches of an 18-inch penetration is recorded as the standard penetration resistance value, or "N" value. The results of the standard penetration tests are indicated on the boring logs. The samples were sealed in containers and provided to HGTS for testing and soil classification. A field log for each boring was prepared by the HGTS drill crew. The logs contained visual classifications of the soil materials encountered during drilling, as well as the driller's interpretation of the subsurface conditions between samples and water observation notes. The final boring logs included with this report represent an interpretation of the field logs and include modifications based on visual/manual method observation of the samples. The soil boring logs, general terminology for soil description and identification, and classification of soils for engineering purposes are also included in the appendix. The soil boring logs identify and describe the materials encountered, the relative density or consistency based on the Standard Penetration resistance (N-value, "blows per foot") and groundwater observations. 2