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' ecto icaITechhasInc • • Page 7 <br /> G g g <br /> Additional Investigation Work Plan <br /> Cardoza(Main St) <br /> Project No 662 2 <br /> Octobei 8,2001 <br /> ' The following table gives general characteristics of background conditions compared to <br /> conditions inside the plume at two stages of plume evolution <br /> ' Parameter Sourceofthe Background Plume a savior ume Behavior <br /> Parameter Core' Margins' <br /> iss0 vE xygen e Acceptor Positive Value— Deplete i yEp ete <br /> urate e Acceptor ite peci is Depleted Not Depleted <br /> FerrousIron' eta o is ypro uct Site Specific nric e of Enriched <br /> ' u ate e Acceptor Site Specific Deplete Mildly Depleteil <br /> Metban&4 Metabolic Byproduct ery ow nric a Slight Enriched <br /> ----Tem—pera-turco Meta b o I is ypro uct Site Specific ----Elevated Slight Elevated <br /> PH eta o is Byproduct Site peci is Elevated Unaffected <br /> ' Alkalinity eta o is Byproduct Site Speci is nric a na ecte <br /> e ox Potential Metal5olic ypro uct Positive a ue Depleted Slightly Lower <br /> on uctivity Metabolic Byproduct ite peci is Lowered Unattected <br /> ' y rogen e Acceptor Non Detect evate Slight Elevated <br /> e =electron <br /> Type T plume characteristic,strongly reducing conditions near source <br /> Type III plume characteristic,mildly oxidizing conditions downgradient form source <br /> ' Terminal electron accepting process <br /> 1 =aerobic respiration <br /> 2 =denitrification <br /> 3 =reduction <br /> 4 =methanogenesis <br /> 5 =fermenfermentation,primarily at chlorinated solvent sites <br /> 6=exothermic reactions <br /> ' The following natural attenuation parameters are proposed for testing Abbreviations and <br /> units of measurement are given in the table below <br /> ' Parameter XGUreviation Unit Indicator Field or Lab <br /> Dissolved Oxygen 02 mgNegative Value Field <br /> Nitrate 3- mg Depleted a <br /> ' Ferrous Iron Fe mg Enriched ie a <br /> u ate SO4 mg Depleted Field/Lab <br /> Temperature 0Cig t yElevated 7—ieTcT- <br /> pHpH unit less Sliglitly"Elevated Field <br /> ' Alkalinity 3 or 3 mg n—ri ched Field/LaF— <br /> Redox Potential ORP (E-,,T— mv Negative Value Field <br /> Conductivity EC -----mVTcm ig t y ower' ie <br /> = <br /> indicator o emg int the interior or the plume compared to being in background conditions <br /> ' 5.0 SCHEDULE & REPORTING <br /> Geological Technics Inc anticipates beginning fieldwork no later than 30 days after <br /> USTCF'P approval and upon issuance of the drilling permit The information gathered <br /> during this please of work will be presented in a report, which will include a summary of the <br /> geology as well as the results of sample analyses Quarterly reports will be submitted for the <br /> ongoing groundwater investigation Based on this information, GTI will complete a fate & <br /> ' transport/risk evaluation report to determine if the site represents a threat to human health or <br />