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i I It Fnldrl do 14LILn 1 vi lr Ell.r third V1 IrtLr '0011 GIOLI11dW firer 'V 001tUring r LID17er 17 2000 ' PAgL 3 . I[IV Lstlgation rLSults all Installation of additional monitor wL1Is to monitor the leading edge of the M 1 131 plume, ' ( (IlTlprLhCllti1\L S11L ourid Information Is inLluded in Appendix B 3 THIRD QtJ 4RTT R, 2000, GROUNDWATUR MONITORING 31 FIELD tMITTHODOLOGY On 1)LpternbU 7 2000 a ( ondol ILpresentatl\,e was on site to conduct quarterly groundwater monitoring activities I ITL monitornig aLtivities included mLasUlement of watci ICVLIS In the site monitor wLIIS alid at surface ' water rrleasurLmcnt stations and thL L0HLLtl0n of groundwater samples irorn the monitor wLlls All field equipment %vati ducontaminated in the field with a solution of laboratory-grade non-phosphate detei gent and de- lolTVLd water and rinsed with de-ionvLd watLr prior to use In eaLh well All field instruments were callbratLd to ' manufacturer recommended Standards I he water level In Lach wLll was measured to the nearest 0 0 l foot with a battery-opLrated fiat-tape \\ater-level meter A liew disposable polyethylene bailer was lowered Into each well to collect a field-Inspection sample 1 he bailer trample was inspected for floating product, sheen, discoloration and/or odor Floating product or sheens were not observed in the groundwater removed from any of the monitor wells during the groundwater sampling :Moderate petroleum hydrocarbon odor was noted in the groundwater recovered from MW-2 MW-3, and MW-4 No petroleum hydrocarbon odor was noted in the groundwater recovered ti om 'M W-1 The purging and sampling sequence for the monitor wells was MW-1, MW-4, MW-2, and MW-3 Lach well was purged with a new disposable, polyethylene bailer until three well-casing volumes of water were removed and the electrical conductivity pH and temperature of the water stabilized The purge water was discharged to 55-gallon drums and left on site to await disposal Groundwater Monitoring Field Forms are Included in I� Appendix. C A groundwater sample was collected from each well by filling a new, disposable, polyethylene bailer with groundwater and transferring the groundwater to two 40-milliliter glass vials fitted with TeflonU-lined caps rhe vials were checked to assure that no all bubbles were present Each sample container was labeled and placed in a cooler chilled with Ice and delivered under chain-of-custody procedui es to GeoAnalytical Laboratoi ies, Inc , in Modesto Califoinia Results of the laboratory analyses are discussed in Section 3 3 3 2 LABORATORY ANALYTICAL METHODOLOGY The analvtical methods and detection liinits for the laboratory analyses of the water samples collected dui mg the 1�eptembei 7 2000 g.loundwater monitoring event are summarized in Table 1, on the next page I i t� CONDOR '