2006-043 - Laserfiche WebLink

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1 . Conduct visual reconnaissance along the proposed roadway corridors. Include photographic record of typical, key or anomalous site features noted during the reconnaissance. Review aerial photographs, information from the Soil Survey of Indian River County, Florida, and any geotechnical data furnished by the COUNTY. The Geotechnical subconsultant may rely upon information furnished by the COUNTY without independent review and verification. 2 . Perform up to four Standard Penetration Test (SPT) borings to determine soil parameters (i . e., unit weight, friction angle and cohesion), an estimated wet season water table level and recommendations for drilled shaft construction for use in design of drilled shaft foundations, relative to the design of mast anti signal poles. The borings will be performed to a depth of approximately 35 feet. 3 . Perform up to 38 five-foot auger borings within the proposed alignment to explore the shallow soil stratigraphy and groundwater depths. Eight auger borings are expected to be performed relative to intersection improvements at 58th Avenue. Thirty auger borings are expected to be performed along CR-510. 3 . Conduct up to 10 South Florida Water Management District (SFWMD) exfiltration tests to obtain soil hydraulic conductivity values for the design of runoff water retention and detention areas, as required by the Client. The SFWMD tests will be performed in accordance with methods described in the SFWMD Permit Information Manual, Volume IV. 4 . Obtain three cores from the existing roadway at 58th Avenue. The cores will be obtained using a four-inch diameter diamond-tipped core barrel. The thicknesses of asphaltic concrete, base and subgrade will be measured, and the core holes will be backfilled and patched upon completion. 5 . Obtain soil samples from the auger and SPT borings for laboratory testing. This includes routine classification tests including standard sieve analysis, Atterberg Limits, organic contents, etc. 6. Additional borings, if needed, will be obtained by amendment to delineate any found muck/organic deposits, plastic soils or other deleterious subsurface conditions. This work element may also include the performance of additional field exftltration testing to further explore permeability and hydraulic conductivity values of soils. 7 . Note any rubbish, trash, debris or auger refusal, if encountered. Also note any contamination with petrochemicals evident visually or through odor or the soils encountered . If petrochemicals are encountered, notify the COUNTY immediately. Approximately backfill all borings after recording ground water levels. Work shall be done at times that will minimize traffic disruptions (avoid AM and PM peak traffic hours). Provide appropriate lighting and safety traffic control devices such as flashing 4