1. Stake all boring locations in the field. Determine ground surface elevation at each boring location using a known benchmark. 2. Clear underground public and private utilities through appropriate authorities. 3. Perform surface exploration of soil and groundwater conditions in the building area and other areas of the project classifications and depth of each layer of material, including the N-value, moisture content and observed water level. 4. Seal the borings according to the requirements of the State Department of Health or equivalent. 5. The report must notify the owner of the evidence of the fills soils or debris that could represent potential environmental concerns and the need of the other investigative sampling and testing. 6. Provide a written report with a review of soil conditions and engineering properties, including recommendations based on the geotechnical exploration. If soil correction is necessary in the anticipated building area, include a table in the report that identifies the anticipated depth of soil correction at the boring location. Provide the owner digitally in .pdf format. 7. Include a drawing indicating boring location and number of borings to correspond to logs, tables, charts, etc. 8. The exploration and the report should include the following items. a. Classification of the soils by then Unified Soil Classification System (USCS). b. Provide a mechanical analysis of each representative soil type, including the identification of the percentage passing the No. 200 sieve. The intent of this test is to aid in evaluation of frost susceptibility and backfill suitability. Identify unit weights and moisture content of representative clayey / silty soil types. c. Liquid limits and plasticity index for cohesive soils. d. Provide the minimum, maximum and particularly an average thickness of topsoil depth over the entire site. Provide a topsoil analysis of pH, percentage clay and silt content and organic content. Provide recommendations for the fertilizer and topsoil amendments. Also, provide the pH of the native soil. e. Note the soil resistivity and comment on whether underground tanks and piping should be cathodically protected. f. Identify an allowable bearing pressure (psf) for use in design of conventional spread footings. Discuss estimated total and differential settlements recommended foundation depth(s) and anticipated frost depth. Bearing wall loads will range from 4 to 6 klf. Column loads will range from 50 to 80 kips. g. If the spread foundations are not recommended, propose alternative foundation types given the proposed building type and soil conditions. If piles are recommended, provide the following additional information: pile types, depths and recommended spacing. Estimates of potential settlements. Load capacities including the following values: gross capacities, negative skin friction “down drag” (state as zero if not a factor in calculation), net capacity (gross minus down drag), lateral load capacity and associated movement, uplift capacity. Also, make recommendation for pilling load tests. h. Identify lateral earth pressure in equivalent fluid pressure and note Kp, Ko, and Ka. i. Coefficients of friction for soil to concrete, and internal friction angle. j. A “modulus of subgrade reaction: K” in pounds per cubic inch for concrete pavement and floor slab design. k. An estimated stabilometer “R” and “CBR” value for the designing bituminous pavements, and recommended pavement sections for both bituminous and concrete pavements for parking lots and service drives. l. Provide OSHA soil type A, B, or C for excavation purposes. m. Recommendations for the preparation of subgrade soils to support footings and floor slabs, including the need for under slab vapor barrier, drain tiles within and around the building foot print. n. Identify evidence of ground water encountered in the borings (measure levels of wet and / or water bearing soils). o. Discuss the need for de-watering during construction, and permeant control of the ground water around below grade spaces. p. Discuss probable seasonal ground water elevations. q. Provide an infiltration test or estimate of probable infiltration rates for the biofiltration design along with permeability rate. r. Pavement recommendations to validate the City’s typical pavement section and for heavy-duty and light-duty concrete and bituminous concrete sections. s. Provide a log of each boring that identifies the soil type, n value, Water level t. Provide anticipated permeability and infiltration rates for the soils within the borings. u. Recommendations for preparation of subgrade soils for pavement sections for vehicular traffic and the need for draintile drainage systems adjacent to or beneath pavement areas. v. Discuss probable seasonal ground water elevations. w. Provide constraints, risks or other encumbrances for stormwater management infiltration systems on this site with respect to the existing soils in this area. x. Provide constraints, risks or other soil or geo-hydrological issues that may arise due to stormwater infiltration systems adjacent to the existing slopes on each site.
