Exploratory Borings Sample Clauses
Exploratory Borings. The geotechnical engineer will obtain borings at locations described by the Consultant for the proposed bridge structure and elsewhere along the West 347th Street road alignment. The Consultant will stake the location of the borings for Kleinfelder to use. It is understood that field adjustments may be required based on accessibility and/or conflicts. Kleinfelder will provide the Consultant with the necessary field information to tie out the new boring locations in the basemap if adjustments are required. One (1) boring will be located at each abutment and pier location. The abutment borings will be drilled from the existing roadway to a depth of approximately 15-feet into limestone and shale bedrock. The pier borings will be advance in the area of the existing bridge piers to a depth of approximately 30-feet into limestone and shale bedrock. Based on review of the available geologic information, the geotechnical engineer has assumed the coreable limestone bedrock will be 45-feet below existing grade at the abutment locations and 20-feet below grade at the piers.
Exploratory Borings. A Consultant field geologist or engineer will direct a subsurface investigation and implement the DEH- approved Workplan. The field staff will continuously log each boring in general accordance with the Unified Soil Classification System (USCS) (ASTM D-2487), and sample exploratory borings at seven (7) locations to depths up to approximately 25 feet for the collection of soil, soil vapor, and/or groundwater samples. A direct push drilling rig will be used to advance each exploratory boring to the desired depth and to assist with retrieving soil and groundwater samples. The direct push drilling rig will also be used to assist with the installation of the soil vapor probes. The direct push drilling rig will be equipped with a dual wall sampler that consists of an inner sampling barrel and an outer steel casing. The outer steel casing helps protect the integrity of the boring during sample collection and helps prevent cross contamination between different sampling intervals. The inner casing is fitted with an approximately 5-foot long acetate liner that retains soil as the casing is advanced. As the direct push drilling rig advances the dual wall sampler, in-situ soil is retained within the inner acetate liner. Once the sampler has been advanced approximately 5-feet, the acetate liner is retrieved leaving the core barrel in place and is then replaced with a new acetate liner for the next 5-foot interval. This procedure is repeated until the desired boring depth is achieved. An organic vapor meter (OVM) will be used to measure volatile vapors within the soil retained from each boring. For each 5-foot section of soil retrieved from an exploratory boring, a small hole will be drilled through the acetate liner at approximately 1-to-2-foot intervals, and the OVM probe will be inserted into the hole to record the volatile vapor concentrations. The subsurface material observations and OVM readings will be recorded on the boring logs. Soil samples will be collected for laboratory analysis from the five (5) locations where temporary soil vapor probes will be installed (discussed below). The soil samples will be collected from depths corresponding to the temporary vapor probe installation depth, which is anticipated to be approximately 5-feet and 15-feet at each location. Additional samples may be collected for laboratory analysis based on subsurface observations, OVM readings, and/or other signs of apparent contamination. The ten (10) soil samples will be analyzed for...
Exploratory Borings. To explore the subsurface conditions of the Phase 2 Project Site, the Consultant shall drill, log, and sample, at least, four (4) exploratory borings at the Phase 2 Project Site using conventional truck-mounted hollow-stem auger drilling equipment and 10 to 12 supplemental hand augers with hand augering equipment. The Consultant’s supplemental conventional borings shall extend to depths of approximately 20 to 40 feet in depth. The Consultant shall require that any hand augers utilized shall extend to depths of approximately five to 12 feet. The Consultant shall collect soil samples from the Consultant’s borings for visual classification and laboratory testing.
Exploratory Borings. To explore the subsurface conditions, The Consultant Team will drill, log and sample seven (7) exploratory borings at the site using conventional truck- mounted, hollow-stem auger drilling equipment and/or track-mounted, limited-access drilling equipment. Our conventional borings will extend to depths of approximately 10 to 30 feet below current site grades. The Consultant Team will collect soil samples from our borings for visual classification and laboratory testing. The approximate locations of our borings are shown on the attached Proposed Exploration Location Plan; final location of all explorations may be modified in the field as needed.