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i <br /> Work Plan for Additional Site Assessment <br /> and Interim Renediation/Feasibility Testing <br /> ARCO Facility No.5469 <br /> Stockton,California <br /> Page 6 <br /> SCOPE OF WORK <br /> The proposed scope of work has been subdivided into tasks 1`through 10, which includes <br /> iricorporating the newly-installed monitoring wells into the existing quarterly groundwater <br /> monitoring program. All geologic work will be conducted under the direct supervision of <br /> a State of.California Registered Geologist and will be conducted in accordance with <br /> standards established by the Tri-Regional Board Guidelines for Hydrocarbon Site <br /> Assessment and Remediation (RWQCB 199 1) and PHS/EHD guidelines. <br /> Task 1: Prefield Activities <br /> Following 'approval of the work plan by PHS/EHD, the following activities will be <br /> implemented: <br /> • Update the site-specific Health anti Safety Plan, <br /> • Obtain an access agreement from the property owner east of the ARCO facility, <br /> • Obtain an encroachment permit from the City of Stockton, <br /> • Secure well installation permits from PHS/EHD, and <br /> • Mark the proposed well locations and notify Underground Service Alert, ARCO, <br /> PHS/EHD, and CRWQCB of the 'scheduled field activities. <br /> Task 2: Field Activities <br /> Vertical Assessment- CPT borings <br /> In order to evaluate the vertical extent of impact, Delta will oversee a California .licensed <br /> drilling contractor advance one CPT boring onsite to an appzoximate depth of;120 feet <br /> bgs. The proposed location of the boring is shown:on Figure 3. The actual location of <br /> the boring will be based on accessibilitynand the location'of underground utilities. The <br /> proposed method of assessment involves the use-ofan electronic piezocone advanced in <br /> one boring!to provide a continuous.log of the soil ;profile, while two adjacent borings, <br /> created by a direct push method, allow for collection of discreet soil and groundwater <br /> samples (Hydropunch�). <br /> 5 ' <br /> The CPT consists of advancing a cone-tipped cylindrical probe (1.7 inches in diameter) <br /> into-the ground while simultaneously measuring the resulting resistance to penetration. A <br /> computer generated CPT log is plotted in the field, providing a continuous log of site <br /> lithology. Upon completion of sampling, the CPT hole,will be pressure grouted from the <br /> bottom of the borehole up to surface grade. <br /> P:1ARC0154691Work Plan\5469 wrkpin 03-2002.doc <br /> 4 <br />