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April 3, 2017 3 Proposal No.: SWP-17-058 mark inside private property, to assist in locating underground utilities, we respectfully request that utility maps for onsite utilities be provided to us, if readily available. Drilling permits will be obtained from the appropriate agency. Task 3 — Field Exploration We propose to evaluate general subsurface conditions at the site by performing approximately two days of subsurface exploration with a drill rig utilizing hollow-stem auger type techniques and a cone penetrometer rig (CPT). Borings and CPT soundings will be performed to collect soil samples and evaluate the general nature of the anticipated soil conditions across the site. Borings and CPT's will be located in general accordance with CGS Note 48 requirements regulated facilities which requires a minimum of one exploration point within the near-vicinity of the building footprint for every 5,000 square feet of first floor area with a minimum of two exploration points per structure. Approximately 12 exploration points are planned within the building footprint with additional borings anticipated within proposed parking areas. Borings and CPT's within the building footprint will be excavated/advanced to depths ranging from approximately 20 to 50 feet. Boring depths are measured below the existing ground surface and will be excavated to the approximate stated depth or to practical refusal, whichever occurs first. Boring/CPT depths may be adjusted depending on conditions encountered in the field. A representative of Earth Systems will log subsurface conditions and will obtain samples for visual observation, classification and laboratory testing. Soils will be logged in general accordance with the Unified Soil Classification System. Our typical sampling interval within borings will be approximately every 21/2 to 5 feet to the full depth explored; however, sampling intervals may be adjusted depending on the materials encountered onsite. Bulk samples of the soil materials will be obtained. The number of blows necessary to drive either a Standard Penetration Test [SPT] sampler or a California-type sampler within the borings will be recorded. The depth to groundwater will be measured, if encountered. Borings will be backfilled with grout. Our field exploration will be provided under the direction of a State of California Certified Engineering Geologist and a Registered Geotechnical Engineer from our firm. In the event that unusual site conditions not presently anticipated are encountered during exploration, we will bring it to your attention and will discuss with you the effect of these conditions on both the estimated cost and timing of the report. Task 4 - Laboratory Testing Laboratory tests will be performed on selected samples to evaluate the physical characteristics of the materials encountered during our field exploration. We anticipate laboratory testing will include moisture content, dry unit weight, maximum density/optimum moisture content, sieve analysis, consolidation/collapse potential, shear strength, R-Value, and Expansion Index. Testing will be performed in general accordance with American Society for Testing and Materials [ASTM] or appropriate test procedure. Selected samples will also be tested for a screening level of corrosion potential (pH, electrical resistivity, water-soluble sulfates, and water-soluble chlorides). Earth Systems does not practice corrosion engineering; however, these test results may be used by a qualified engineer in designing an appropriate corrosion control plan for the project. The EARTH SYSTEMS SOUTHWEST