2023 09 19 City Council Packet
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Proposal for Geotechnical Exploration and Design Services GEOServices Proposal No. 14‐22643 N. Jackson Street Improvements – Athens, Tennessee December 22, 2022 2 | Page GEOTECHNICAL SERVICES We propose to explore the site subsurf ace conditions with three (3) borings. Two of the borings will be performed at the crest of the existing slope and one boring will be performed at the toe of the slope. The two borings located at the crest of the slope will be extended to a depth of 40 feet, or to a uger refusal, whichever occurs first. The boring located at the toe of the slope will be extended to a depth of 25 feet, or to auger refusal, whichever occurs first. The maximum total drilling footage is estimated as 105 linear feet. Standard penetra tion resistance tests (SPT) will be performed at 2.5 feet intervals in the upper 10 feet and then at 5 feet intervals to the termination depth. Additionally, rock coring will not be included as part of this exploration. The borings will be backfilled with soil cuttings prior to leaving the site. All soil samples will be retu rned to our laboratory where they will be reviewed by a member of our professional staff to visually classify the soils and to select representative samples for testing. Laboratory testing of selected soil samples will include natural moisture content determinations, Atterberg limits tests and unconfined compressive strength testing. Our services will culminate with a written preliminary report prepared by a geotechnical engineer or project staff professional under the review of a senior engineer licensed in Tennessee. The report will provide the following: All field data required to be recorded according to the ASTM standard s or other standard test methods employed shall be obtained, recorded in the field and documented in the report. All soil shall be classified based on field data, laboratory tests, and other standard test methods by the Geotechnical Engineer of record. Including a chart illustrating the soil classification criteria and the terminolog y and symbols used on the boring logs. Boring logs showing vertical sections of each boring plotted and graphically presented showing boring number. A description of the existing surface conditions and summary of the subsurface conditions. The visual classification of soils according to the Unified Soil Classification System and id entified with the appropriate letter symbol for all soil strata identified in the boring logs. The soil nature and origin, including changes resulting from man’s activities and stream erosion/deposition. Recommendations for soil related construction conditions such as site preparation, fill construction, excavation slopes and ground water control. Earthwork construction criteria, including the suitability of cut soils for reuse as fill, subgrade inspection and stabilization and fill compaction criteria. 98