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rr r fa ' <br /> AMBRIA <br /> Boring Depths HSA well borings MW-7 through MW-9 were drilled to a depth <br /> of approximately 70 fbg Boring SB-3 was advanced to depths <br /> of 35 76, 35 92, 36 74, and 53 81 fbg, where refusal was <br /> encountered <br /> Groundwater Depths Cambria observed groundwater at approximately 63 5 fbg in <br /> well borings MW-7 and MW-8 and at 60 fbg in MW-9 during <br /> drilling activities On June 15, 2004, Blaine Tech Services, Inc <br /> (Blaine) of San Jose, California measured groundwater in wells <br /> MW-2 through MW-9 at depths ranging from 63 65 to <br /> 66 08 fbg Blaine's gauging data is included in Appendix D <br /> Soil Classification Soils encountered during HSA drilling consisted predominantly <br /> of sandy silt, silt, and clayey silt (ML), sand (SP and/or SW), <br /> and silty sand(SM) at varying depths and thicknesses to the total <br /> depth explored of 70 fbg Soil types are recorded on the boring <br /> logs (Appendix B) Soil types encountered during the CPT <br /> borings consisted of clay, silt, clayey silt, and sandy silt, silty <br /> isand, sand, gravelly sand, and stiff fine grained soil at various <br /> intervals to the total explored depth of 53 81 fbg <br /> Chemical Analyses. Selected soil samples from the well borings and groundwater <br /> samples from wells MW-2 through MW-9 were analyzed for <br /> TPHg, BTEX, and fuel oxygenates (MTBE, di-isopropyl ether, <br /> TAME, ethyl tertiary butyl ether, and tertiary butanol) by EPA <br /> Method 8260B <br /> Soil Disposal Soil generated during field activities was stored onsite and <br /> covered with plastic sheeting The soil stockpile was sampled <br /> and profiled for disposal (laboratory data in Appendix E) On <br /> May 20, 2004, Manley and Sons Trucking, Inc of Sacramento, <br /> California transported 7 93 tons of soil to Allied Waste <br /> Industries' Forward Landfill in Manteca, California for disposal <br /> Well Materials The monitoring wells were constructed using 4-mch diameter, <br /> Schedule 40 PVC casing with a 0 020-inch screen slot size and <br /> Monterey #2112 sand-pack Well construction details are <br /> presented on Table 1 and on the logs in Appendix B <br /> i I ' <br /> 0953 4 <br /> I I, <br /> p � I I , I ' ' r �ig �'` i V• I <br />