03 - Laserfiche WebLink

Ken Mercer Sports Park Skatepark r r m Scope of Services March 1, 2021 design Page 2 of 9 group Deliverables: • Topographic Survey in AutoCAD DWG format at Adobe PDF format Subtask A.4: Geotechnical Engineering BSK Associates will perform a Geotechnical Evaluation to assess the subsurface conditions at the proposed skate park location. This task will include project setup, permitting, field coordination, and administration of BSK's services. They will visit the site and mark exploratory locations with white paint and/or stake and file for a Zone 7 Water Agency Permit. BSK will call Underground Service Alert (USA North 81 1) a minimum of 72 hours prior to the field exploration and submit USA ticket(s) for utility clearance. During the site visit to mark proposed exploration locations, they recommend that a City representative familiar with the site's underground utilities meet with them in the field to assist with identifying underground utilities that could be in conflict with our proposed exploration points. BSK proposes to explore the subsurface conditions at the Site by drilling three (3) hollow-stem auger borings to depths of approximately 15 to 20 feet BGS each at approximate locations (see Exhibit B.) A professional from BSK will maintain a log of the soils encountered, record the blow counts obtained at each sampling interval, and obtain samples for visual examination, classification, and laboratory testing. The soil sampling will be performed using SPT and 2.5-inch I.D. lined split spoon samplers. The strength characteristics of the cohesive soil samples recovered will be evaluated in the field using a hand-held pocket penetrometer. During our investigation, they will also measure the approximate depth to free groundwater if it is observed in our hollow-stem auger borings. Upon completion, the borings will be backfilled with cement grout per County requirements. Although this is rare, in the event that hazardous materials are encountered as indicated visually or by odor in the soil borings during our subsurface investigation, such borings will be immediately terminated, and arrangements will be made to backfill such borings with cement grout. BSK will notify Client as soon as possible of such an occurrence, and both parties will mutually decide whether to continue, modify, or cease the remainder of the investigation program. Laboratory tests will be performed on selected soil samples to evaluate pertinent engineering properties for design of the project. Laboratory tests which they anticipate performing may include measurement of in-situ moisture content and dry density, Atterberg limits, sieve analysis, and shear strength testing. One corrosion screening test will also be performed.They will also perform a Resistance (R)-Value test at the location of the potential parking lot expansion. After the subsurface investigation is completed, if they find it necessary to perform additional tests, BSK will contact Client for prior approval. BSK will evaluate their findings and perform geotechnical engineering analysis to develop conclusions and recommendations for the anticipated improvements. Their findings and recommendations will be summarized in a report prepared under the supervision of a California registered Geotechnical Engineer. They will only provide a digital copy of the report in PDF format. At this time, they anticipate that the report will include the following items: