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that once housed stored diesel can offer insight into the suspected upper zone of <br /> contamination. <br /> It is proposed that sampling using a backhoe or excavator with an achievable depth <br /> of 12 to 20 FT proceed as soon as possible. This proposed two day activity will be <br /> accomplished during clear weather in the accessible ( surface treated) yard area. <br /> Samples will be collected in 100-250 ml glass jars with Teflon seals, labeled and <br /> transferred to Sequoia Analytical Laboratory for TPHd;ese, analysis. Soil classification <br /> and lithology determination to the excavation depth limit will be performed under <br /> the direct supervision of a California registered Civil Engineer or Geologist as <br /> necessary. Excavated soil will be either returned to the excavation pit, or <br /> stockpiled nearby, and covered pending laboratory analysis. Upon profiling <br /> excavated soil it may be either retained for remediation or disposed off site at a <br /> suitable landfill. The test hole will be back filled with clean soil with field <br /> compaction to approximately 80% to within 2 FT of the surface. Remaining fill to <br /> grade will be compacted to 90% Proctor relative density. <br /> A Photo Ionization Device (PID) will be used during the process to examine <br /> headspace in a "baggie" to make a rough determination of degree of contamination <br /> and possible hazardous levels of hydrocarbons in the soil . <br /> I will notify you at time of sampling and appreciate your oversight. I understand that <br /> for the shallow excavation pits no drilling permit is required, nor field observation of <br /> backfilling as in the case of test wells. <br /> Please contact me at (530) 823-2156 if you have any questions or recommendations <br /> to the proposed work plan contained in this addendum. <br /> Sincerely, <br /> Daniel K. Barber P.E. <br /> D.K. Barber P.E. &Associates <br /> Cc: 1 copy via FedEx to CVRWQCB <br /> Cc: Client WOS <br /> 3 <br />