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i MEW Field screening of the soil samples was conducted according to the following procedure: L - The soil sample was covered with aluminum foil, capped at one end and then emptied of half its contents to provide headspace. After removing half the sleeve's contents, the opening was covered with aluminum foil to seal the vapors from escaping. - The stainless steel sleeves were then placed in the sun to allow the sample to heat and volatilize contaminants in the soil. - Once the sample had been allow to heat, the PID probe tip was inserted into the headspace through the aluminum foil to collect the field measurement. As indicated in the boring logs presented in Appendix B, a maximum VOC measurement of 4.5 ppm was recorded in boring HP-2. 4.4.3 T.i hological Loggi„ng Tetra Tech's geologist logged each boring by both continuous inspection of the drill cuttings and by examination of samples collected at each sample interval. Detailed logs completed for each boring include a geotechnical description and Unified Soil Classification designation of soils encountered, blow counts required to collect samples, instrument measurements, and general comments (such as odor). A description of site geological conditons is presented in Section 3.0. Copies of all boring logs are presented in Appendix C. 4.5 Hydropunching Hydropunching was conducted utilizing a HydroPunch 11 groundwater sampling system. The HydroPunch H is a specifically designed sample tool that provides hydraulic continuity with the adjacent water table. The sample tool was pushed into the proper zone (approximately 5- foot submergence for groundwater sampling), then withdrawn to expose an inlet screen. The top of the screened interval (0.01 or 0.02 inch screen size to minimize turbidity) remained above the groundwater contact in order to capture potential volatile organic compounds. Once withdrawn, the interior of the sample tool filled with water. A 1" O.D. teflon bailer was then lowered through the hollow push rods and body of the HydroPunch II to collect a water TETRA TECH:Castle Rock Forest Fire Station,Preliminary Site Assessment Report Page I I