Common use of Geologic Map/Report Clause in Contracts

Geologic Map/Report. Consultant shall perform a site visit to complete a visual Condition (Distress) Survey of existing paved areas within the Project limits, to identify and map areas of pavement distress. Distressed areas identified include alligator cracking, depressions, potholes, and other loss of pavement sections. Consultant shall prepare photos along with written descriptions of the distressed areas and include them in the study. Concurrently, the areas where pavement coring and soil borings are to be performed shall be marked out in white paint and have their locations called in to USA Alert Underground Service Notification (USA) a minimum of 72-hours prior to any pavement coring or boring work commences. Consultant will perform a ReMi shear-wave-velocity survey to provide an approximate assessment of layers and depth to bedrock in the deeper soil layers. Consultant shall meet with County representatives and/or USA subscribers to verify the location of existing underground utilities and relocate proposed boring/coring locations as necessary. Consultant shall review the existence of observable obstacles to drilling. Consultant shall obtain TRPA and permission, County encroachment permit and County Environmental Health Department permit, as necessary. County will obtain permissions to enter from private property owners. The County and Consultant will work together to obtain the most recent site remediation information including monitoring results for the remediation site within the project area. Consultant shall measure pavement and base thickness by coring or cutting as part of drilling the parking lot borings. The cores shall be performed to measure the thickness of the existing pavement structural section (asphalt concrete and aggregate base types and thicknesses) and to acquire samples of the subgrade soils for visual identification and later laboratory testing. The pavement cores will be measured to map the existing asphalt pavement and base thicknesses (with the boring locations as well) so a minimum grinding plane can be established for the pavement reconstruction. Consultant shall provide (coning off) traffic control for all work within the roadway to perform the borings. It is estimated that 5 borings will be required to 15 feet depth, 3 within asphalt areas and 2 in landscaped areas. The site was previously remediated for TCE from a nearby drycleaners. A Health and Safety Plan (HASP) will be prepared for the drilling program. Level C PPE (with respirators available on site and used only as needed) and cleaning will be provided. A Photo-ionization Detector (PID) shall be used during the boring program to check for the presence of petroleum hydrocarbons from all recovered soils In addition, soil samples will be maintained in Ziploc bags and allowed to “breathe” to allow PID readings on any odorous collected samples. Drilling will be terminated at shallower depth if heavily scented and visually more highly contaminated soils are encountered. Consultant shall sample all borings nearly continuous in the upper five (5) feet and at approximately 5-foot intervals thereafter, where drilling is extended deeper than five (5) feet. Rock (granite and granodiorites), where encountered, shall be cored to a minimum of 2- feet below the bottom of the pipe or manhole inverts. The borings shall be used to define the soil and groundwater conditions within the improvement area and to obtain soil samples for laboratory testing. Within each boring, the existing pavement sections shall be measured. Consultant’s technical professional (either professional geologist or professional engineer) shall log all borings. The borings shall be backfilled with soil cuttings from the drilling operation (or grouted as required by County Environmental Health Department requirements) and capped with a cold asphalt patch. Three separate shallow borings (two to four feet deep) will be advanced preferably in landscaping or on the edge of the pavement that will be used to perform in-hole percolation/infiltration tests. Percolation tests will be run to obtain reliable information for design of BMPs and vaults but will not be permitted or reviewed by state agencies. These borings will be backfilled with non-compressible materials upon completion. Consultant will conduct a TRPA Soils/Hydro investigation to determine depth to seasonal high groundwater. Accordingly, Consultant will prepare and submit the TRPA Soils/Hydro application and submit the application to the TRPA, will provide coordination to have TRPA staff present during the soils investigation, will prepare the Soils/Hydro Memorandum to establish maximum excavation depths for the Project. Using the information gathered during the record search and the field investigation, Consultant shall prepare a geologic profile of the encountered soil and rock conditions along the Project. The results of the petroleum hydrocarbon contamination screening shall be provided in plan format with measured concentrations and inferred contaminant level contours between sampled sites. Included in the descriptions shall be the engineering properties of the soils, types and jointing (strike and dip) of the rock, strength of the rock (compressive), and existing roadway conditions. The engineering properties and descriptions shall be provided in a tabular format referencing the laboratory and field testing used to develop them. Rock dip and strike shall be mapped in the conventional stereographic plot. Deliverables: • Geologic profile