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MMr Mike Infurna Project 20805-224 002 <br /> April 26, 1999 <br /> Page 2 <br /> i <br /> Field Activities <br /> Product Delivery Line, Dispenser and UST Removal/Replacement and Verification <br /> Soil Sampling <br /> Pinnacle proposes to conduct the following scope of work associated with product <br /> delivery line, dispenser and UST removal and replacement which includes verification soil <br /> sampling activities <br /> Pinnacle will observe the removal of the existing product delivery lines and dispensers <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 Samples will also be collected from beneath each of the 3 USTs which are to <br /> be removed and replaced Soil samples will be collected under the direction of the San <br /> Joaquin County Public Health Services or Fire Department representative Soil samples <br /> will be collected at approximately 1 foot below the former product lines and dispensers <br /> using 2-inch-diameter handauger and hand-operated percussion sampling equipment The <br /> percussion sampler will be equipped with stainless steel sample tubes and will be driven <br /> beyond the bottom of the handaugered borehole The sample tube will be sealed with <br /> Teflon® tape and plastic end caps and labeled with project number, sample designation, <br /> and sampling date The sample will be placed in an ice chest and logged on chain-of- <br /> custody documentation Sampling equipment will be decontaminated between sample <br /> locations to prevent cross contamination of samples UST samples will be collected from <br /> beneath each end of the USTs and as directed by the County representative on site <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, dispensers and UST locations If field evidence indicates hydrocarbons <br /> remain in place, Pinnacle will direct the subcontractor to overexcavate until field <br /> screening data (using a photoionization detector [PID]) of soil samples collected from the <br /> base and sidewalls of the excavated area indicate soil containing relatively high <br /> concentrations of hydrocarbons have been removed Overexcavation of soil will be limited <br /> CP\E 1ARC016020\REP0RTS\6020P203 AOC-951sg 1 ;)&Mae& <br />