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1 <br /> BP Oil Facility No 11191 <br /> April 11, 1995 <br /> described the encountered soil, and prepared a log of each boring GSI sample collection <br /> procedures are presented in Appendix A Logs of Boring are presented in Appendix B <br /> Boring B-6 was drilled to 51 feet bgs, and bonngs B-7 and B-8 were drilled to 51 5 feet <br /> bgs. Groundwater was not encountered in the borings Upon completion, the borings were <br /> backfilled to approximately four inches bgs with neat cement, and then finished flush with <br /> surface grade using cold asphalt patch The neat cement seals were placed in the borings <br /> using a pump and tremie pipe Mr Harlen Knoll of the SJCEHD was present to observe <br /> the placement of the boring seals. <br /> Soil samples from the soil borings were screened in the field for evidence of petroleum <br /> hydrocarbons. Headspace screening of the soil samples was performed using an Organic <br /> Vapor Meter (OVM) photoionization detector (PID) Headspace screening procedures are <br /> presented in Appendix A PID readings were recorded on the boring logs in Appendix B <br /> Field screening of the soil samples did not detect evidence of hydrocarbons <br /> Soil cuttings generated during the drilling process were placed on and covered with plastic <br />� sheeting pending disposal. Approximately 1 5 cubic yards of soil were generated by the <br /> drilling process Four soil samples were collected from arbitrary locations on the <br /> stockpiled soil for compositing and disposal analysis Stockpile sampling procedures are <br /> presenter) in Appendix A <br /> RESULTS OF THE SUBSURFACE INVESTIGATION <br /> Soil beneath the subject site appears divided into three general subdivisions The upper <br /> three feet consists of black clay, which appears to be laterally continuous across the portion <br /> of the site investigated The clay is underlain by silt and sandy silt to between 20 and 30 <br /> feet bgs The silt is underlain by interbedded sand, silty sand, and silt to the total depth <br /> explored Soil encountered during this investigation is similar to soil encountered during <br /> previous subsurface investigations <br /> Soil encountered during this investigation did not exhibit visual evidence of hydrocarbons. <br /> Hydrocarbon odors were not noted in the encountered soil Headspace screening of soil <br /> samples did not detect evidence of residual petroleum hydrocarbons <br /> z <br /> Chemical Analytical Data <br /> Six soil samples from the soil borings (samples B6-46 5, 136-51, B7-46 5, B7-51 5, <br /> 138-46.5, and B8-51 5) and four soil samples from the stockpile (SP-la,b,c,d) were <br /> 4300701-2 3 <br />