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r <br /> SMTN <br /> at the end of this report A soil vapor extraction test was conducted at the site by RESNA in <br /> November 1992 (RESNA, January 1993) Investigations have shown that the majority of <br /> petroleum hydrocarbons in the soil were present from 0 to approximately 25 feet below grade <br /> and within a radius of about 20 feet of the former 1,000 gallon gasoline UST tank pit <br /> r <br /> A soil vapor extraction system was constructed at the site and operated from July 1993 to April <br /> 1995 Quarterly groundwater monitoring results have shown detectable levels of petroleum <br /> hydrocarbons in the monitoring wells in the past but have decreased to, and remain at <br /> ' nondetectable levels <br /> rPURPOSE AND PROPOSED WORKSCOPE <br /> The purpose of this site investigation is to collect soil data from the vicinity of the former <br /> gasoline UST excavation to obtain site closure certification To achieve this goal the following <br /> scope of work is proposed <br /> • Drill three exploratory soil borings to approximately 30 feet <br /> • Analyze selected soil samples for total petroleum hydrocarbons as gasoline (TPHg), total <br /> petroleum hydrocarbons as diesel (TPHd), and benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) utilizing EPA methods 8015/8020 <br /> 0 Prepare a summary report <br /> The workplan below describes in detail each of the tasks to be completed to provide soil data <br /> ' for the closure request All work described in this workplan will be performed in accordance <br /> with SMTH's field methods presented in Appendix I and with the Site Safety Plan presented in <br /> ' Appendix II <br /> ' WORKPLAN <br /> Task 1 - Permitting and Scheduling <br /> rThis task includes obtaining the necessary permits for drilling from SJCPHS, scheduling field <br /> personnel and equipment, locating underground utilities, and performing any other necessary <br /> 0540061REPOR7S1595 WP 2 <br /> 1 <br />