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Work Plan for Additional Site Assessment • <br /> ARCO Facility No. 6100 <br /> Tracy,California <br /> Page 5 <br /> SOIL BORINGS -Assessment of Oxygenates in the Vicinity of the USTs and Fuel <br /> Dispensers <br /> Delta proposes to advance two onsite soil borings (13-39 and B-40) to depths of <br /> approximately 100 feet bgs. Information gathered from these two soil borings, as well as <br /> boring B-38 described above, will be used to evaluate the extent of oxygenates, <br /> specifically MTBE, in the vicinity of the USTs and fuel dispensers. The proposed <br /> locations and boring depth is based on the distribution of petroleum hydrocarbons <br /> beneath the site, as identified during previous investigations. The proposed locations are <br /> presented on Figure 2. The borings will be advanced by a drilling rig equipped with <br /> hollow stem augers. Soil samples will be collected every five feet for soil classification <br /> and laboratory analyses. If soil is encountered that appears to be permeable, a <br /> Hydropunch sampler will be used to retrieve a representative water sample for laboratory <br /> analysis. <br /> SCOPE OF WORK <br /> The following scope of work has been subdivided into tasks 1 through 5. All geologic <br /> work will be conducted under the direct supervision of a State of California Registered <br /> Geologist and will be conducted in accordance with standards established by the Tri- <br /> Regional Board Guidelines for Hydrocarbon Site Assessment and Remediation (RWQCB <br /> 1991). <br /> Task 1: Pre-field Activities <br /> Following approval of the work plan,Delta will implement the following activities: <br /> • Obtain an access agreement from the owner of the property south of the ARCO <br /> facility, <br /> • Obtain well installation permits from San Joaquin County PHS/EHD, <br /> • Retain and schedule a licensed drilling contractor, <br /> • Update the site Health and Safety Plan, <br /> • Mark the drilling locations and contact Underground Service Alert to locate <br /> underground utilities in the area, <br /> • Notify ARCO, San Joaquin County PHS/EHD, and the owner of the offsite <br /> property, of the work schedule. <br /> CdARC0\6100\REPORTS\6100 workplan 05-22-01.do <br />