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TABLE 3 SUMMARY OF GROUNDWATER ANALYTICAL RESULTS (PAHs)'2,3 US CAN-WELTY ROAD Vernalis,California Concentrations reported in pg/L a� P qj P v L GJ P �4 ° ,L� GJ L� ,Q97 V G> q -C Z Q 41 IM: N i ateD � .p o 0 0 o N ,� -o c P to Sample ID Collected Q Q Q m U $ w t; Z a 4 SCREENING WQO 20 4 --- 2,100 s 0.017 6 0.0029 6 0.04 6 --- 0.04 6 0.4 6 0.0038 7 130 8 280 s 0.04 6 17 9 --- 210 ' LEVELS ESL 20 10 30 11 0.73 11 0.027 11 0.014 11 0.029 11 0.10 11 0.029 12 0.35 11 0.0048 12 8 11 3.9 11 0.04811 17 12 4.6 11 211 WFSMW-119 01/23/07 <0.01 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.01 <0.02 <0.02 <0.01 0.016 <0.02 0.048 <0.01 0.032 (cont.) 04/30/07 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 0.032 J <0.01 0.019 J 08/07/0718 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Monitoring discontinued on 08/21/07 per RWQCB. Abbreviations: Notes: Cal/EPA=California Environmental Protection Agency *Starting with the second quarter 2006,laboratory analytical data are being qualified and flagged as appropriate. Please see the respective Data Usability D=Duplicate sample Summary section of the reports for detailed information on the qualifiers used. E=Indicates the reported value is estimated due to associated QC results 1. PAHs were analyzed by Lancaster Laboratories,Inc.,using EPA Method 8270C SIM or LVI. The QC limits for PAHs and EPA=U.S.Environmental Protection Agency surrogate standard recoveries by LVI GC/MS are advisory only until sufficient data points can be obtained to calculate ESL=Environmental Screening Level statistical limits. ID=Identification 2. Results in bold exceed WQOs and/or ESLs. IRIS=Integrated Risk Information System 3. See Attachment B for data usability summary. J=Indicates the reported value is an estimated concentration detected between the MDL and LOQ 4. WQO Taste and Odor(EPA National Recommended Ambient Water Quality Criteria). LOQ=Limit of qualification 5. WQO Toxicity(EPA IRIS Reference Dose as a Drinking Water Level). MCL=Maximum contaminant level 6. WQO Toxicity(Cal/EPA Cancer Potency as a Drinking Water Level). MDL=Method detection limit 7. WQO Toxicity(EPA National Recommended Ambient Water Quality Criteria,one in a million cancer risk,source of drinking water). ND=Not detected at or above the laboratory reporting limit 8. WQO Toxicity(EPA National Recommended Ambient Water Quality Criteria,non-cancer health effects,source of drinking water). NS=Not sampled 9. WQO California State Notification Level(formerly Action Level). PAHs=Polynuclear aromatic hydrocarbons 10.ESL Taste and Odor(Ceiling Value). RWQCB=Regional Water Quality Control Board 11. ESL Aquatic Habitat Goal. SIM=Selective ion monitoring 12.ESL Toxicity(Drinking Water). SPO=Separate-phase oil 13. Not sampled due to the current or historical presence of SPO. WFS=Western Farm Service 14. Insufficient water volume in the well to sample. WQO=Water Quality Objective 15. PAH results are reported for the sample collected on March 30,2006. <=Analyte not detected at or above the laboratory reporting limit shown 16. The duplicate sample was labeled differently on the chain-of-custody form. gg/L=Micrograms per liter 17. The reporting limits were raised due to required initial dilution of sample matrix. 18. Well was not accessible. 19. Well located on WFS property. Sources: WQOs defined in San Francisco Bay Basin(Region 2) Water Quality Control Plan(Basin Plan) January 2007. WQOs may be stated in either numerical or narrative form. Narrative water quality objectives are interpreted by values from SWRCB A Compilation of Water Quality Goals -July 2008. ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater (Interim Final May 2008). Page 4 of 4 Fmmscfencerosorurfors