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Project No 58100-06-IIA <br /> March 15, 1995 <br /> Page 3 <br /> PURPOSE AND RATIONALE <br /> The purpose of the work outlined in Task Order 10-5F1000-2 is to provide additional information <br /> regarding the vertical and lateral extent of petroleum hydrocarbon soil and groundwater impacts <br /> in the vicinity of the former fuel underground storage tanks (USTs) The proposed groundwater <br /> monitoring well locations are designed to attempt to define the lateral limits of the dissolved phase <br /> petroleum hydrocarbon groundwater impacts In addition, a soil boring has been proposed within <br /> the former UST excavation to aid in determining the maximum TPHg and TPHd vadose zone soil <br /> concentrations in the central portion of the plume <br /> SCOPE OF SERVICES <br /> The following scope of services have been prepared to achieve the objectives stated herein <br /> Pre-Field Activities <br /> A pre-work site visit was conducted on March 6, 1995 with the Caltrans contract manager, Mr <br /> . Salyed Aly, to inspect the work area The Site Vint Checklist and Completion Schedule was <br /> subsequently discussed and signed by the Geocon project manager and the Caltrans contract <br /> manager <br /> Well permits issued by the San Joaquin County Environmental Health Division (SJCEHD) are <br /> required for the installation of the proposed groundwater monitoring wells Geocon will prepare <br /> and submit the well permit application with fees to the SJCEHD for approval <br /> Geocon will mark the proposed boring locations, provide 48 hour notification to Underground <br /> Service Alert and review project utility plans prior to Job site mobilization <br /> A site specific Health and Safety plan will be prepared to provide guidelines on the use of <br /> personal protective equipment (PPE) during the field activities <br /> Soil Borings <br /> Excavate six borings at the locations depicted on Figure 2 to a maximum depth of approximately <br /> 75 feet bgs utilizing a truck mounted, hollow stem auger drill rig Each boring will be hand- <br /> augered approximately 5 feet prior to drilling to aid in clearing potential underground utilities <br /> Collect soil samples at five foot intervals from within each boring The soil samples will be <br /> obtained utilizing a modified "California" Sampler equipped with 6-inch long stainless steel <br /> sample tubes to facilitate sample handling and storage Following sample collection, the tubes <br />