ARCHIVED REPORTS_ANNUAL 2014 GRAOUNDWATER MONITORING AND SAMPLING REPORT

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TABLE 4 ' GROUNDWATER ANALYTICAL RESULTS(TPH and BTEX)""' ALDEN PARK Tracy,San Joaquin County,California Concentrations reported in pg/L Date Ethyl- Total Well ID Sampled TPIld I TPHdsg I TPHg I Benzene I Toluene benzene Xylenes SCREENING WQO 100° 100^ 5° 0.15 5 42^ 29° 17 LEVELS ESL 1001 100 6 1001 1 7 40 6 30 6 20 08/01/06 Not sampled due to the presence of SPO;oleophilic sock placed in well 01/29/07 Not sampled due to the presence of SPO;oleophilic sock placed in well ' 02/01/08 Not sampled due to the presence of SPO;oleophilic sock placed in well MW-21 01/15/09 Not sampled due to the presence of SPO;oleophilic sock placed in well '--- (cont.) 01/07/10 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/07/11 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/19/12 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/18/13 Not sampled due to the presence of SPO;oleophilic sock placed in well 03/28/14 INot sampled due to the presence of SPO;oleophilic sock placed in well ' Abbreviations: (F)=Results for analysis of filtered sample D=Duplicate sample E=Indicates the reported value is estimated due to associated quality control results EPA=United States Environmental Protection Agency ESL=Environmental Screening Level ID=Identification J=Indicates the reported value is an estimated concentration detected between the method detection limit and limit of quantitation µg/L=Micrograms per liter 1 MCL=Maximum Contaminant Level MW=Monitoring well NA=Not analzyed. ND=Not detected at or above laboratory detection limit NS=Not sampled 1 RWQCB=Regional Water Quality Control Board SPO=Separate-phase oil SWRCB=State Water Resources Control Board TPH=Total petroleum hydrocarbons ' TPHd=TPH quantified as diesel-range organics(CIO-C,5) TPHdsg=TPHd with silica gel-cleanup procedure TPHg=TPH quantified as gasoline-range organics(C6-CI,) WQO=Water Quality Objective 1 Notes: Values in bold exceed the WQO or ESL or both. 1. TPHd(CSO to C,5)by EPA Method 8015M used prior to third quarter 2006;starting with third quarter 2006, EPA Method 80158 used.TPHd with silica-gel preparation,EPA Method 8015 M used prior to third quarter 2006; starting with third quarter 2006. TPHg(C6 to C„)by EPA Method 8015M used prior to third quarter 2006, ' starting with third quarter 2006,EPA Method 8015B used. BTEX were analyzed using EPA Method 8021B. Samples were analyzed by Lancaster Laboratories,Inc.until 2013 when samples were analyzed by Calscience Environmental Laboratories Inc. 2. Results in bold exceed WQOs and/or ESLs. 3. See Appendix C for data usability summary. 4. WQO(Tastes and Odors)that prohibits adverse tastes and odors or nuisance conditions. 5. WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. 6. ESL(for protection or current or potential drinking water resource)based on Ceiling Value. 7. ESL(for protection or current or potential drinking water resource)based on Drinking Water Toxicity. ' 8. Detection limits were raised due to dilution. The sample was diluted due to matrix effect(foamy). 9. Results after a second silica gel-preparation procedure. 10.The observed sample pattern is not typical of#2 fuel/diesel. It elutes in the DRO range later than 92 fuel. 11. Well added into extraction network during the third quarter 2013. Sources: 1 ESLs from San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater (Interim Final), May 2008. WQOs defined in the Central Valley RWQCB Water Quality Control Plan(Basin Plan)for the Sacramento River Basin and San Joaquin WQOs may be stated in either numerical or narrative form. Narrative water quality objectives are interpreted by values from SWRCB O'' leidos Page 10 of 10