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Canepa Is Car Wash 248 E Park Street, Stockton, Cal{forma January 14, 1994 Interum Status Report on Phase II Investigation Page: 2 I After receipt of analytical data from these borings, a second phase of drilling, including borings and monitoring wells, was planned and approved by an addendum letter with the San Joaquin County Environmental Health Division I On November 10, 11 and 12, WHF, Inc , returned and drilled three (3) morutonng wells, MW-1, 2 and 3, and three (3) soil borings to the capillary fringe, B-4, 5 and 6 (Figure 2) ' The three monitoring wells were drilled to 65 feet below ground level, laboratory soil samples taken every five feet from 15 to 65 feet (Table 1, Appendix A), and well casing installed from p to 45 feet with well screen from 45 to 65 feet Well completion data is shown on the Bonng/Well Completion logs (Appendix C) These wells were surveyed (Appendix F) and water level readings and water samples taken (Appendix D) for laboratory analyses (Appendix B) The survey data and water level readings were used to calculate the groundwater gradient (Figure 4) IThe three additional borings were each drilled to 51.5 feet below ground level and laboratory samples taken every five feet from 15 to 515 feet (Table 1, Appendix A) These boring; were then backfilled with a bentonite/cement grout to ground level I 3.1 Drilling ' Permits were obtained before drilling began The borings were accomplished using a mobile mounted drilling ng employing the use of a 6 1/2" o.d hollow stem flight auger All drilling equipment was thoroughly steam-cleaned before drilling began, to prevent the introduction of contamination from off-site, and between borings to prevent cross-contamination The borings were logged under the direct supervision of a registered professional using the Unified Soil Classification System (Appendix E) The color, texture, moisture, plasticity, consistency of the earth materials, pertinent soil or bedrock characteristics, and any evidence of contamination were noted All water-bearing zones and the depths at which they were encountered were noted on these logs (Appendix C) All borings were drilled in such a manner as to prevent cross contamination between strata Exploratory soil borings were backfilled with a neat cement/bentorute grout mixture to the original grade. I The cuttings from the drilling operation and steam-cleaning were containerized on-site for proper disposition The groper method of disposal will be dependent upon the results of laboratory analyses This disposal will be the responsibility of the client unless other arrangements have been made