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r <br /> Ms Tish Briggs Project 20805-224.002 <br /> February 10, 1999 <br /> Page 2 <br /> the direction of the San Joaquin County; Public Health Services or Fire Department <br /> representative. Soil samples will be collected at approximately 1 foot below the former <br /> product lines and dispensers using 2-inch-diameter handauger and hand-operated <br /> percussion sampling equipment. The percussion sampler will be equipped with stainless <br /> steel sample tubes and will be driven beyond the bottom of the handaugered borehole. The <br /> sample tube will be sealed with Teflon tape and plastic end°caps and labeled with project <br /> number, sample designation, and sampling date. The sample will be placed in an ice chest <br /> and logged on chain-of-custody documentation. ',, Sampling equipment will be <br /> decontaminated between,sample locations to prevent cross contamination of samples. <br /> Verification soil samples will be submitted to a state-certified analytical laboratory for <br /> I 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 iertiary butyl ether, and tertiary amyl <br /> methyl ether using USEPA Method 8260, and total lead using USEPA Method 7420. <br /> am <br /> Additional Excavation and Soil Sampling <br /> g • <br /> If warranted, Pinnacle will observe limited overexcavation.1 in the vicinity of the former <br /> product lines and dispenser locations. if field evidence indicates hydrocarbons remain-in <br /> `:, <br /> place Pinnacle will direct the subcontractor to ove.rexcavate 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 /> t <br /> laterally and six feet vertically. <br /> Stockpiled Soil Sampling <br /> Soil generated during the removal of the product delivery lines and dispensers will.be <br /> f temporarily stored on site .and placed on and covered with visqueen. One four point <br /> composite sample will be collected for every 100 .'cubic yards of stockpiled soil. The <br /> samples will be composited by the laboratoryand will be analyzed for TPHG, BTEX,. and <br /> total lead using the methods discussed above. <br /> Reporting <br /> Pinnacle will prepare a report summarizing the product delivery line and dispenser <br /> CPe\ARC0154691REPORTS�5469PI01.DOC-95 1sg:1 �LilitQC�C <br /> Eh , <br />