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. Mr Mike Infurna Project 20805-224 002 <br /> April 14, 1999 <br /> Page 2 <br /> and collect one soil sample every 20 linear feet and at corners, turns and connections <br /> beneath the former product lines and one soil sample beneath each of the former <br /> dispensers Soil samples will be collected under the direction of the San Joaquin County <br /> Public Health Services or Fire Department representative Soil samples will be collected <br /> at approximately 1 foot below the former product lines and dispensers using 2-mch- <br /> diameter handauger and hand-operated percussion sampling equipment The percussion <br /> sampler will be equipped with stainless steel sample tubes and will be driven beyond the <br /> bottom of the handaugered borehole The sample tube will be scaled with Teflon tape <br /> and plastic end caps and labeled with project number, sample designation, and sampling <br /> date The sample will be placed in an ice chest and logged on chain-of-custody <br /> documentation Sampling equipment will be decontaminated between sample locations to <br /> prevent cross contamination of samples <br /> Verification soil samples will be submitted to a state-certified analytical laboratory for <br /> analyses of total petroleum hydrocarbons as gasoline (TPHG) and benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) using U S Environmental Protection Agency <br /> (USEPA) Modified Methods 8015 and 8020, respectively, oxygenates (methyl tert butyl <br /> ether, tertiary butyl alcohol, di-isopropyl ether, ethyl tertiary butyl ether, and tertiary amyl <br /> methyl ether using USEPA Method 8260, and total lead using USEPA Method 7420 <br /> Additional Excavation and Soil Sampling <br /> If warranted, Pinnacle will observe limited overexcavation in the vicinity of the former <br /> product lines and dispenser locations If field evidence indicates hydrocarbons remain in <br /> place Pinnacle will direct the subcontractor to overexcavate until field screening data <br /> (using a photoionization detector [PID]) of soil samples collected from the base and <br /> sidewalls of the excavated area indicate soil containing relatively high concentrations of <br /> hydrocarbons have been removed Overexcavation of soil will be limited to two feet <br /> laterally and six feet vertically The excavated soil is proposed to be stockpiled at the <br /> location shown on Figure 1 <br /> • The anticipated length of areas to be overexcavated will be approximately 100 to <br /> 120 feet The actual length along the piping trenches may vary based upon <br /> observed impacts and results of field screening <br /> • The anticipated volume of material to be removed from beneath the piping <br /> trenches is 60 cubic yards This volume is typical for recent piping and dispenser <br /> replacement activities at other ARCO facilities <br /> C"1ARM0020\REP0RTS16020P201 DOC-951sg 1 P[sm"& <br />