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-r <br /> } <br /> Ms. Wendy Cohen <br /> April 18, 1996 <br /> Page 2 <br /> Soil samples will be obtained for chemical analyses from the capillary fringe and the boring <br /> terminus. Additional samples may be collected based on field observations. <br /> Soil and groundwater samples will be analyzed for diesel-range (extractable; C10 - C23) and <br /> gasoline range (purgeable; C4 - C 2) petroleum hydrocarbons by GC-FID and for BTEX using <br /> USEPA Method 8020. Samples will not be filtered; however, silica gel clean-up procedures will <br /> be performed on the extractable samples (diesel-range petroleum hydrocarbons) to eliminate <br /> positive interferences from non-petroleum hydrocarbons. Recommendations will be made to the <br /> analytical laboratory with respect to separation of the solvent peak from analytes peaks. <br /> Analytical quantitation limits will be in accordance with the RWQCB's Tri-Regional <br /> Recommendations. <br /> Soil samples will be obtained for chemical analyses from the capillary fringe and the boring <br /> terminus. Additional samples may be collected based on field observations. Soil samples will be <br /> analyzed for diesel-range (extractable; Cio- C23) and gasoline range (purgeable; C4 - Cie) <br /> petroleum hydrocarbons by GC-FID and for BTEX using USEPA Method 8020. <br /> The installation and sampling of well MW-25 will be in lieu of sampling existing wells MW-13, <br /> MW-16, MW-17, MW-18 and MW-19. The rational for eliminating these well from additional <br /> sampling in based on the following: <br /> • Stable conditions,have been exhibited in well MW-13 through previous sampling events.. <br /> Wells MW-16 and MW-18 are upgradient of well MW-20 and down gradient of well MW- . <br /> 13. Well MW-20 has not exhibiteddetectable levels of petroleum hydrocarbons over the last <br /> four monitoring events. <br /> • Wells MW-17 and MW-19 are slightly cross gradient to well MW-13. - <br /> Well installation procedures will be conducted on Friday, April 19, 1996 and well <br /> development/groundwater sampling the week of April 22, 1996. Another sampling event will be <br /> conducted during the week of May 27, 1996. <br /> 3) Geologic Cross Section . <br /> The geologic cross section previously submitted in Geomatrix's Submittal of Items Requested by <br /> RWQCB in Support of SiteElosure, dated February 28, 1996,will be revised to include existing <br /> analytical data from soil,and groundwater and high and low groundwater table elevations that <br /> have existed since well installation.. <br /> 4) Remaining Soil Contamination <br /> Request fulfilled with documents submitted earlier. <br /> II <br />