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1117 Lone Palin Avenue, Suite 201 V Modesto, California -2225 ( %TC 209579-2221 Fax: 209-579-2225 ASSOCIATES INC . high dose test in Task 3 . Soil and groundwater firom the original Task 3 test and the repeated test may be combined , Two sets of tests will be conducted . The first set will comprise four replicates containing groundwater treated with ozone and site soils not treated with ozone; these will represent conditions down gradient of the treatment zone. The second set will consist of four replicates containing treated water and frealed soil; these represent conditions within the treatment zone, once ozonation has ceased. Periodically, one replicate from each set will be utilized and the aqueous phase will be analyzed for bromate. Analytical Methods Analytical methods for chemical analyses are TPHg (GRO), BTEX, oxygenates, 1 ,2-DCA by EPA Method 8015/8260B, bromide and bromate by EPA Method 300, total chromium by EPA 6020, Cr(VI) by EPA Method 7199 or Hach (Hach DR 2010 Spectrophotometer and appropriate Hach kit reagents). i SENSITIVE RECEPTOR SURVEY ATC proposes the completion of a sensitive receptor survey for the site and surrounding area. Water well construction logs for locations within a half-mile radius will be requested from the Department of Water Resources (DWR) in Sacramento, California. A walking survey of the site and vicinity will be conducted i to identify known or visible groundwater wells located within 2,000400t radius. Current topographic and street maps will be examined as well a visual site reconnaissance to identify surface water bodies of nahn•al or man-made origin in the vicinity of the site. Schools, daycare facilities, hospice/special care, hospitals and other health care facilities will also be identified and plotted on an area map, SITE CONCEPTUAL MODEL ATC recommends the preparation of a site conceptual model summarizing historical site data to include the following: i • Subsurface Geology and Site Topography • Regional and Local Hydrogeology (direction/gradient and velocity of groundwater flow) • Aquifer Geochemistry • Major Migration Pathways Surface and Surface Features • Surface and Subsurface Water Features (uses and potential vicinity receptors) • Exposure Evaluation Flowchart • Contaminant Mass Calculations • Site Risk Evaluation • Supplemental Documentation o Local and regional plan view maps showing location of contaminant source(s), extent of contamination, direction and rate of groundwater flow and location of receptors. i Workplan for Feasibility Studies — Former Stockton Taxi Company ATC Associates Inc. S:...\28349\ WP for Pilot Testingand SCM ATC Project No. 54.28349.0001 12