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I 150 Acre Spanos Park Residential Development <br /> January 20, 1989 <br /> Page 3 <br /> 3. Laboratory classification and index testing Laboratory Investigation <br /> would be conducted on samples obtained <br /> from the borings along with any necessary <br /> strength testing. Unconfined compressive <br /> strength tests and/or Torvane shear strength <br /> tests would be performed on samples of the <br /> more cohesive soils, as required. Four "R" <br /> value tests would beerformed on <br /> samples of the subgrade soil for pavement <br /> d <br /> design purposes. <br /> 4. We would perform the geotechnical analysis Geotechnical Analysis <br /> and evaluation of the resulting field and and Evaluation <br /> laboratory data to develop the required <br /> residential foundation design criteria. ' <br /> Recommendations for backfilling the slough <br /> would also be developed. We would also <br /> evaluate potential geologic hazards, at a <br /> reconnaissance level, including liquefaction, <br /> lateral spreading, differential seismic <br /> compaction, fault rupture, and ground shaking. <br /> 5• We would prepare a geotechnical investigation Conclusions, <br /> report presenting the results of our study. The Recommendations <br /> report would summarize the field and laboratory and Report <br /> test data and present our recommendation for 4 <br /> building foundation types, depths, and <br /> allowable bearing pressures. Recom- <br /> mendations for earthwork, slabs-on-grade and <br /> pavements would also be included. To facilitate <br /> the usefulness and readability of the report, an <br /> executive summary would also be provided. <br /> We make no warranty, expressed or implied, except Warranty <br /> that our services would be performed in accordance <br /> with geotechnical engineering principles generally <br /> accepted at this time and location. <br /> If the scope and cost of this proposal are agreeable Authorization and <br /> with you, please sign one copy of this letter and Schedule <br /> return it to us as authorization to proceed. We have 1 <br /> begun the permit application process upon your <br /> verbal authorization and are prepared to start the <br /> field work within five days after receiving the permits I <br /> from the County and your authorization. We would I <br /> need approximately three to four weeks following <br /> completion of our field work to conclude our study. <br /> We understand that you desire a preliminary verbal <br /> M <br /> I <br />