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� II SIERRA Soils encountered during drilling consisted of low-to moderate-permeability sandy silt and silty sand and high-permeability sand and silty sand The soil classification system used to classify soils is included in Appendix D Detailed descriptions of subsurface sediments, sampling depths and OVM field measurements are shown on the boring log (Appendix D) Drill cuttings were stored temporarily on-site pending analytic results Drill cuttings were disposed of by a Chevron vendor 2.2 Monitoring Well Installation Ground water was encountered at 56 feet below grade during drilling The water bearing zone consisted primarily of high-permeability silty sand and sand The ground water monitoring well was constructed in the boring in accordance with SES Standard Operating Procedure - Monitoring Well Design and Construction (Appendix C) Water level data and will construction details are shown on the boring log in Appendix D, and are summarized in Table 5 (Appendix B) The well was constructed using 0 010-inch slotted well screen and #2/12 sand, these selections were based on the observations of site conditions by the field geologist A typical well construction detail is included in Appendix D 3. WELL DEVELOPMENT AND GROUND WATER SAMPLING Monitoring well MW-6 was developed on August 19, 1992 by SES personnel using a vented surge block in accordance with SES Standard Operating Procedure-Monitoring Well Development (Appendix C) Well development water was removed using a submersible pump All site wells (MW-2 through MW-6)will be sampled on September 9, 1992 and the results of the sampling event will be documented in the quarterly monitoring report to be prepared by SES The wells will be sampled in accordance with the SES Standard Operating Procedure - Water Sampling (Appendix C) Ground water samples will be collected with steam-cleaned teflon bailers Page 5