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Fuller Mobile Home Park <br />' 365 E. Louise Ave.,Lathrop, California February 23, 1995 <br /> Phase HSite Characterization - Continued Page: 2 <br />' 3.0 Scope of Work <br /> On November 22, 1994, WBF drilled two bonngs, B-5 and B-6, to obtain data to help <br />' determine placement of additional monitoring wells Laboratory soil samples were <br /> obtained at five and ten feet below ground level and a groundwater sample was bailed <br /> from each boring through a stainless steel screen inside the augers B-5 soil samples were <br /> ND (None Detected), but the groundwater sample had BTEX contamination B-6 was <br /> ND for both soil and water Morutonng well MW-4 was installed in the sidewalk of <br /> Bizzibe Street in the apparent down-gradient direction Laboratory soil samples were <br />' obtained at five, ten and twenty-five feet below ground level <br /> On December 21, 1994, after receiving the analytical results from the previous borings, <br /> VffW drilled and installed three monitoring wells, MW-5, 6 and 7 Each was 25 feet deep <br /> and soil samples were taken at five and ten feet <br /> 3.1 Drilling <br /> Permits were obtained as necessary for all wells before drilling began The soil <br /> bonngs were accomplished using a mobile mounted drilling ng employing the use <br /> of a hollow stem flight auger of 6 112" o d <br /> All drilling equipment was thoroughly steam-cleaned before drilling began, to <br /> prevent the introduction of contamination from off site, and between bonngs to <br /> Iprevent cross contamination <br /> I The bonngs were logged under the direct supervision of a registered professional <br /> using the Unified Soil Classification System (Appendix F) The color, texture, <br /> moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil <br /> or bedrock characteristics and any evidence of contamination were noted All <br /> water bearing zones and the depths at which they were encountered were also <br /> noted on these logs <br /> IAll bonngs were drilled in such a manner as to prevent cross contamination <br /> between strata Exploratory soil bonngs within the unsaturated zone were <br /> backfilled with a cement and three percent (3%) Bentonite mixture <br /> Upon termination, the borings into the saturated zone were completed as <br /> I monitonng wells and backfilled with concrete grout, after a Bentonite seal had <br /> been placed (Appendix C) The bonngs for the monitoring wells were of a <br /> diameter at least 4 inches greater than the 2 inch diameter of the well casing to be <br /> used <br />