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, 6?/J Mr. Stephen Jenkins, P.E. - Apri13, 1996 Page 2 Prior to mobilizing our drilling equipment, we will coordinate the boring locations with City of San Marcos and utility companies personnel; however, it will be the responsibility of the City of San Marcos and/or Utility companies to locate existing underground utilities near each boring location. ~- Cohesive soils will be sampled using 3" thin-wall push tube samplers. Cohesionless soils will be sampled using 2" split-barrel samplers in conjunction with Standard penetration Tests. An NX-size core barrel will be used to sample rock-like materials if encountered. Initial groundwater observations 'will be made during the drilling operations. Two of the borings (septage grease and rearation/effluent) will be converted to groundwater monitor wells for 24-hour and subsequent groundwater levels. In the remaining eight borings, a temporary open riser type piezometer will be set for 24-hour groundwater readings. After the 24-hour readings, the temporary piezometers "Will be pulled and the holes will be filled and plugged. All the samples will be extruded in the field, labeled, wrapped in plastic, and transported to the laboratory for testing. Laboratory tests will consist of Atterberg Limits, percent passing #200 sieve, and gradation for soil classification purposes. Unconfined compression tests will be conducted in cohesive soils for short- term strength evaluations. Pocket penetrometer tests will be conducted on cohesive push tube samples. Standard penetration tests will be conducted in the bore holes fGr relative density and strength estimates for sandy/gravelly type soils. Soil box resistivity and pH tests will be conducted for corrosion potential. The results of the field exploration and laboratory testing program will be evaluated by a Texas Registered Professional Engineer specializing in Geotechnical Engineering. Engineering evaluations and recommendations will be limited to providing the following: 1. Description of field operations and laboratory tests; 2. Summary of laboratory test results, individual boring logs, and boring location map; 3. Review and reference of available existing geotechnical and geologic information; 4. Description of subsurface materials and conditions including geologic and stratigraphic interpretations; 5. Short-tenn subsurface water observations conducted during the field operations (this is not a groundwater study); 6. Geotechnical design criteria for foundations and subsurface walls for each structure including allowable bearing capacity, estimated volume change (settlement, consolidation, shrink/swell), and lateral earth pressures; 7. Recommended maximum slope angles for permanent cuts or fills;