ARCHIVED REPORTS_ANNUAL 2014 GRAOUNDWATER MONITORING AND SAMPLING REPORT

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�i a 'I TABLE 5 GROUNDWATER ANALYTICAL RESULTS(PAHs)"" ALDEN PARK Tracy,San Joaquin County,California Concentrations reported inµg/L Abbreviations: Cal/EPA—California Environmental Protection Agency 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 (F)=Results for analysis of filtered sample GC/MS=Gas chromatographyhnass spectrometry fi ID=identification J=Indicates the reported value is an estimated concentration defected between the method detection limit and limit of quantitation LVI=Large-volume injection x MCL—Maximum Contaminant Level AIA—Not analzyed ND=Not detected at or above laboratory detection limit IRIS=Integrated Risk Information System NS=Not sampled PAHs=Polynuclear aromatic hydrocarbons e RWQCB—Regional Water Quality Control Board SPO=Separate-phase oil U=Indicates the analyte was analyzed for,but not detected above the level of the associated value WQO=Water Quality Objective a <=Denotes analyte not detected at or above the laboratory reporting limit gg/L=Micrograms per liter -=Not Avai fable Notes: s Starting with the second quarter 2006,laboratory analytical data are being qualified and flagged as appropriate.See the respective Data Usability Summary section of the reports for detailed information on the qualifiers used. 1. PAHs were analyzed using EPA Method 8270C SIM or LVI.The QC limits for PAI-Is and surrogate standard recoveries by LVI GCIMS are advisory only until sufficient data points can be obtained to calculate statistical limits. 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 Attachment C for data usability summary. 4. WQO-Taste and Odor(EPA National Recommended Ambient Water Quality Criteria). S. WQO-Toxicity(EPA IRIS Reference Dose as a Drinking Water Level). 6. WQO-Toxicity(Cal/EPA Cancer Potency as a Drinking Water Level). 7. WQO -Toxicity(EPA National Recommended Ambient Water Quality Criteria,one in a million cancer risk,source of drinking water). 8. WQO -Toxicity(EPA National Recommended Ambient Water Quality Criteria,Non-cancer health effects,source of drinking water). 9. WQO- California State Notification Level(formerly Action Lcvcl). 10.ESL-Taste and Odor(Ceiling Valise). 11.ESL-Aquatic Habitat Goal. 12.ESL-Toxicity(Drinking Water). 13.Naphthalene was detected at approximately 0.07 pg/L(below normal reporting limit)in the laboratory method blank sample. 14.Naphthalene(0.02[tg/L)and phenanthrene(0.011[tg/L)were detected in the field equipment blank. Wells MW-1/KJC,MW-2,and MW-13 were destroyed in April 2006.Trace concentrations of PAHs(naphthalene and phenanthrene) were detected in samples collected in February 2006 from these wells. PAHs have not been historically detected in these wells. As such,confirmation samples were collected on March 30,2006 from MW-I/KJC,MW-2,and MW-13 prior to well destruction activities. The March 30,2006,results are reported. I S.Phenanthrene and flouranthene were detected in the method blank associated with this sample.The sample was re-extracted and comparable sample results were observed.The results reported are from the initial extraction of the sample. 16.2-methy1uaphthalene was detected MW-9 at a concentration of 12 pg/l,on 4/03/97;in MW-19 at 2 pg/L and 4 pg/L(duplicate)on April 3, 1997;and in MW-21 at a concentration of 4}tg/L on April 3,1997. 17. 1-methylnaphthalene was detected in a sample from MW-9(2.34 pg/L;July 9,1997)and in MW-19 at a concentration of 2.34[tg/L on July 9,1997. 18.Fluoranthene and benzo(b)tluoranthenc were detected in the method blank associated with this sample. The sample Nwas re-extracted outside ofthe method required holding time. Comparable sample results were observed between the tvo extractions. The results reported are from the initial extraction of the sample. The blank values were not subtracted from the analytical results. 19.Concentration estimated by the laboratory. 20.Well added into the extraction Network during the third quarter 01`2013. Sources: ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Siles with Contaminated Sail and Grounchrater (Interim Final),May 2008. WQOs defined in the Central Valley RWQCB Water Qualiq,Control Plan(Basin Plan)for the Sacramento River Basin and San Joagmbr River Basin(Fourth Edition),October 2007. WQOs may be stated in either numerical or narrative form. Narrative water quality objectives are interpreted by values from SWRCB r1 Compilation of 1llater Qualify Gaals-July 21308. i I eido Page 11 of 11 3 a