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' (WAR 11 R1) AU)N1101 INO RI POR) OLIOM 1997 <br /> C ANI PA k,CAR WA%iI <br /> (210 YiufiL At DL 11VL1NioSo LA <br /> IJucnibr_i 4[I 19rY7 <br />' 3 0 QUARTERLY GROUNDWATER MONITORING - October, 1997 <br />' On October 21 and 22, 1997, Condor personnel made field obse rvatloiv% and collected groundwater <br /> samples trom the eight monitor wells at the sltf. (see f lgrirc 2 Appendix A for well locations) In <br /> addition at the request of Mr Rowe PHS/EHD, .I groundwater sample was also collected from Soil <br />' vapor extraction well SV-5 ThL order of sampling was MW-8 MVV-5 MW-4, MW-7 MW-6 MW- <br /> 3, MW-2, SV-5 and MW-1 <br />' 3 l Grotmhiatcr Momforing Observation-, and Parameters <br />' The static water level in each well \4as treasured to the nearest 0 01-foot %\ith a battery-operated, flat <br /> tape \Nater-level meter A disposable bailer was lowered Into each well to check for floating product <br /> petroleum odors and sheen Floating product was not observed in any of the monitor wells during the <br /> groundwater sampling However water levels In the wells were above the top of the well screens In <br />' the wells A %light petroleum odor in the groundwater sample collected from MW-1 and MVV-2 and a <br /> strong petroleum odor in the groundwater sample collected from SV-5 +vas noted No odor NNas noted <br /> in any of the other wells at the site <br /> The well% were purged using a Redi-f70 II submersible pump until the temperature electrical <br /> conductivity and pH of the water had stabilized The pump was tliomUghl� decontaminated prior to <br /> use in each well The decontamination procedures consisted of running the pump in laboratory +grade <br /> non-phospliate detergent and h\drocarbon free dater, and then double rinsing the pump in hydrocarbon <br /> free water At least ; casing \olumes of hater «ere pltr<ged from each well (see the Groundwater <br /> Monitoring Field Forms in Appendix I3) I-or the purpose of evaluating intrinsic bkorLmediation of the, <br /> ground\%ater various field parameters were monitored before and after purging each well Including <br /> dissolved oxvgen redrlction-oxidation potential pl-I electrical LonductivaN and temperature The <br /> purged %%iter from each v�ell \%as containerized in a plastic 5>-gillon drain and left on site pending, <br /> analvtkcal results <br /> r32 Ground-ssater Sampling <br /> Each well was allowed to recover to at least 80% of Its pre-purge water level before sampling ThL <br /> groundwater samples were collected directiv from the submersible pump discharge Each water <br /> sample consisted of three 40-m1 glass volatile organic analyses (VOA) vials and one amber liter <br /> I bottle The containers were labeled and placed in a chilled cooler Fhe groundwater samples were <br /> delivered under chain-of-custody procedures to GeoAnalytical Laboratories Inc in Modesto <br /> r � - <br /> California on the same day collected <br /> 4 0 INVESTIGATION RESULTS <br /> 4 1 Groundmvater GradrLnt <br /> On C)LtobLr 21 1997 thL dLptti to grormd,valer was mea-,urLCl In Lach momlor wLii prior to thL <br /> collection of ­roundN%ater sample,, TIIL avLragL dLptll to groundwmr v1ai apprommatLly 41 ; feet <br /> 1 <br /> �� CONDOR <br />