2016-129-E AMS - ECS Carolinas, LLP for geotechnical services, Phase I ESA for Environmental & Agicultural Center

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DocuSign Envelope ID: 3B7FF6D8-761 B-4C88-A691-9E7C554A969C January 7, 2016 0 ECS CAROLINAS, LLP advanced to a depth of 20 feet below existing ground surface or auger refusal. Additionally, four (4) borings will be advanced within the existing pavement areas to a depth of 10 feet below existing ground surface or auger refusal. Coring will be required within existing pavement areas to allow access for soil sampling. If fill material is encountered, the boring(s) should be extended through the fill into firm natural soils; therefore, additional cost (not included in this proposal) should be anticipated. ECS has assumed the site can be accessed with an ATV drill rig. The boreholes will be checked for groundwater upon completion of drilling, and then backfilled by shoveling the soil cuttings into the holes, some settling may occur over time. Standard Penetration Test (SPT) sampling will be performed in general accordance with ASTM D1586 at regular depth intervals in each soil test boring. ECS will collect one a bulk sample from auger cuttings at one of the boring locations for laboratory compaction and CBR testing. In addition to performing laboratory California Bearing Ratio (CBR) testing, ECS proposes to perform Kessler DCP testing in the subgrade soils within the existing pavement areas in order to characterize the in-situ subsurface conditions and provide a California Bearing Ratio (CBR) estimate for use in a site-specific pavement design. Depending on weather, soil, and site conditions, ground disturbance (ruts, tire tracks, etc.) must be anticipated during this exploration program; this is a normal result of driving a large ATV-mounted drill rig over a site. Neither ECS nor ECS' subcontractors are responsible for restoration of the ground surface to its original condition. If ground restoration is required, it will be invoiced to Orange County Asset Management & Purchasing at an additional rate of $160/hour. Based on the existing site conditions, modifications to our proposed boring locations should be anticipated in the field. Upon completion of the field exploration, the soil samples will be delivered to ECS' laboratory and visually classified in general accordance with the Unified Soil Classification System and selected samples will be tested for moisture content and index testing in accordance with ASTM Standards. Engineering Report The conditions encountered by the borings and the results of the laboratory testing will be evaluated by a geotechnical engineer and recommendations for design and construction of the project will be developed. The engineering report will include the following items, if appropriate for this site: • Project description; • Site conditions, including geologic, and special site features; • Field exploration and the laboratory testing procedures; • Subsurface conditions; • Foundation recommendations- • Allowable bearing pressures; • Settlement estimates (total and differential); • Site development recommendations; • Suitability of soils for use as fill material; • Discussion of groundwater impact; • Techniques to control shallow groundwater; • Discussion of difficult excavation; • Compaction recommendations; 0 ECS Proposal Nos. 06:19464 and 06:19465 Page 13 O'"