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Table 1 <br /> Data Quality Objectives <br /> Lincoln Center <br /> Stockton,California <br /> F7r <br /> roblem Statement:COPCs in groundwater may represent an unacceptable current or future risk to humaneceptors.tudy Question:Do COPCs in groundwater represent an unacceptable risk to human health receptors and doomplete exposure pathways need to be evaluated through further study?lternative Outcome#1Based on risk assessment benchmarks,including reference values,and qualitativeanduantitative risk assessment methods,concentrations of COPCs in groundwater present an unacceptable risk touman health or ecological receptors and complete exposure pathways need to be evaluated through further study. <br /> lternative Outcome#2: Bad sk assessment benchmarks,including reference values,and qualitative and <br /> antitative risk assessments methods,concentrations of COPCs in groundwater do not present an unacceptable <br /> tential risk to human health or ecological receptors and complete exposure pathways do not need to be evaluated <br /> rough further study.cision Statement#1: Determine whethdata are s�cient to characterize site COPC distributions in <br /> oundwater for purposes of evaluating applicable complete exposure pathways. <br /> If available data are sufcient to characterize site COPC distributions in groundwater,then evaluate applicable <br /> mplete exposure pathways. <br /> Goals of the 2.If available data are not sufficient to characterize site.COPC distributions in groundwater,than collect additional <br /> Study data to fill data gaps sufficiently to enable evaluation of applicable complete exposure pathways. <br /> Decision at re Determine whether concentrations of site COPCs in grounEedkxceed risk-based <br /> thresholds and/or reference values. <br /> 1.If concentrations of site COPCs in groundwater exceed risk-based thresholds and/ nce values,then <br /> further evaluation is required. <br /> 2.If concentrations of site COPCs in groundwater do not exceed risk-based thresholdreference values, <br /> then further evaluation is not required. <br /> Decision Statement#3: Determine whether the existing remedial actions are able to and reduceconcentrations pf COPCs or exposure to COPCs in groundwater to acceptable levels. <br /> 1.If the existing remedial actions are unable to manage and reduce concentrations of or exposure toCOPCs in groundwater to acceptable levels,then determine what response actions asary to manage andreduce concentrations of COPCs. <br /> 2.If the existing remedial actions are able to manage and reduce concentrations of Cexposure to COPCsin groundwater to acceptable levels,then no response action will be necessary. <br /> Exposure Inputs:concentrations ofCOPCsingroundwater and groundwater level m3.Information graphyInputs:lithologic Ipgs,physical characteristics of soils,testing of sewells,groundwater level <br /> Inputs monitoring,and concentrations of COPCs <br /> Groundwater Quality;concentrations of COPCs <br /> Groundwater Occurance:groundwater level monitoring <br /> Timet Population'lithology from ground surface to the bottom of B Zone <br /> Spatial Limits:location of borings installed downgradient(east)of the site <br /> Exploratory Borings Decision Unit:ground surface to total depth of each boring <br /> Temppral Limits.drilling and logging to be conducted once during a single mobilization <br /> P'r ctical Constraints: locations will be adjusted in the field based on access,actual depth of <br /> borings may be inhibited bydrilling conditions <br /> Target Pooulat groundwater in A Zane <br /> Spatial Limits:locations selected for A Zone well installation <br /> A Zone Well Decision Unit professional judgment based on lithology <br /> 4.Define Temporal Limit= <br /> Boundaries Installation drilling and well installation to be conducted once during a single <br /> mobilization <br /> Practical Constraints locations will be adjusted in the field based on access,actual depth of <br /> wells may be inhibited by drilling conditions <br /> Target Population•groundwater in B Zone <br /> Spatial Limits;locations selected(or B Zone well installation <br /> B ZoneWell Decision Unit:professional judgment based on lithology <br /> Installation Temporal Limits ddlling and well installation to be conducted once during a single <br /> mobilization <br /> Practical Constraints locations will be adjusted in the field based on access,actual depth of <br /> wells may be inhibited by drilling conditions <br /> Gemyntec Consultants,Inc. <br /> Page 1 of 3 <br />