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City of Stockton Draft Amended Report of Waste Discharge (AROWD) <br /> Austin Road Landfill Work Plan <br /> Table 1 <br /> Austin Road Landfill Plume Delineation Work Plan <br /> Sample Types and Analytical Methods <br /> Media Test of Sample Number of Analyte Analytical Method <br /> Type Samples <br /> Groundwater Hydropunch® 14 VOC EPA 8010 <br /> Groundwater Well Sample 4 VOC EPA 8010 <br /> Soil Split-barrel core 14 Grain size ASTM D421/422 <br /> Soil Split-barrel core 14 TOC EPA 9060 <br /> Quality Control Samples <br /> QC water All samples 2 VOC EPA 8010 <br /> QC soils Split-barrel core 1 Grain size ASTM D421/422 <br /> QC soils Split-barrel core 1 TOC EPA 9060 <br /> Notes: <br /> 1. VOC=Volatile Organic Compound <br /> 2. Grain Size Analysis <br /> 3. TOC=Total Organic Compound <br /> 2.3 Task 3 - Data Analysis <br /> Data collected during the field investigation will be used to refine the site conceptual model of <br /> plume migration. Methods to interpret the data include the following: <br /> ■ Mapping of soils and VOC data—expresses the continuity of the shallow and deep aquifer <br /> layers and the location of the contaminant plume,respectively. <br /> ■ Temporal analysis of sampling results—provides insight into plume migration and <br /> attenuation rates. <br /> ■ Analysis of pumping(interference)test results—provides information used for determining <br /> groundwater flow rates,aquifer yield,and the size of the capture zone around the extraction <br /> wells. <br /> Information obtained from the proposed field investigations,combined with existing data,will be <br /> used in groundwater flow and contaminant transport modeling. The combination of these analysis <br /> methods will provide a complete picture of the current VOC groundwater plume. <br /> The purpose of using a groundwater flow model is to depict flow and plume migration in three <br /> dimensions and to provide better understanding of the performance of potential corrective actions. <br /> If the data analysis warrants,a three-dimensional finite element numerical flow and solute transport <br /> model will be considered to evaluate plume migration at the site. The purpose of the numerical <br /> model is to test the conceptual model quantitatively against field data. The model will be used to <br /> evaluate the following: <br /> ■ Induced infiltration from Little John's Creek. <br /> W:\REPORTS\STOCKTON\AUSnNIWORKPLAN.DOC Page 14 <br />