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Ms. Margaret Lagorio Project 797613 <br /> August 30, 1999 <br /> Page 2 <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 <br /> soil 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 the USTs which are to be <br /> removed and replaced. Soil samples will be collected under the direction of the San <br /> Joaquin County Environmental Health Division representative. Soil samples will be <br /> collected at approximately 1 foot below the former product lines and dispensers using 3- <br /> 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 the center and each end of the USTs and as directed by the County representative <br /> 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) using U.S. Environmental <br /> Protection Agency (USEPA) Modified Method 8015; benzene, toluene, ethylbenzene, and _ <br /> total xylenes (BTEX) using USEPA Method 8020; oxygenates (methyl tert butyl etf <br /> tertiary butyl alcohol, di-isopropyl ether, ethyl tertiary butyl ether, tertiary amyl met <br /> ether) using USEPA Method 8260; and total lead using USEPA Method 7420. <br /> If groundwater is encountered in the UST excavation, a grab sample will be collected <br /> analyzed for TPHG, BTEX, MTBE, and oxygenates using above-referenced methods. <br /> Additional Excavation and Soil Sampling <br /> If warranted, Pinnacle will observe limited overexcavation in the vicinity of the forruci <br /> product lines, dispensers and UST locations. If field evidence indicates hydrocarbons <br /> CP1E:1ARCO\60801REPORT516080P101.DOC-951sg:1 t' � <br />