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TABLE 3 SUMMARY OF GROUNDWATER ANALYTICAL RESULTS(TPHd and BTEX)1,2,3 US CAN-WELTY ROAD Vernalis,San Joaquin County,California Concentrations in pg/L Boring/ Collection I Date Ethyl- Total Well ID I Method I Sampled I TPHd TPHdsg Benzene Toluene benzene Xylenes SCREENING WQO 100 4 1001 0.15 5 42 4 29 4 17 4 LEVELS ESL 100 6 1006 1 7 40 6 30 6 20 6 SB-44 RRW 7/20/2010 <50 NA <0.1 <1.0 <1.0 <1.0 SB-44 D 99W 7/20/2010 63 E <50 <0.1 <1.0 <1.0 <1.0 SB-45 99W 7/22/2010 <50 NA <0.1 <1.0 <1.0 <1.0 SB-46 7/21/2010 3,100 200 <0.1 <1.0 <1.0 <1.0 SB-47 ggw 7/21/20101 100 <50 <0.1 <1.0 <1.0 <1.0 Abbreviations: BTEX=Benzene,toluene,ethylbenzene,and total xylenes D=Duplicate sample E=Estimated value based on surrogate recovery levels EPA=United States Environmental Protection Agency ESL=Environmental Screening Level ggw =Grab groundwater ID=Identification MCL=Maximum Contaminant Level NA=Not analyzed RWQCB=Regional Water Quality Control Board SAIC-Benham=The Benham Companies,LLC,an SAIC Company TPHd=Total petroleum hydrocarbons quantified as diesel,C10-C25 TPHdsg=Total petroleum hydrocarbons quantified as diesel with silica-gel cleanup. WQO=Water Quality Objective <=Denotes analyte not detected at or above the laboratory reporting limit pg/L=Micrograms per liter Notes: I. Samples were collected by SAIC-Benham and analyzed by Lancaster Laboratories,Inc. TPHd were analyzed using EPA Method 8015 Modified performed both with and without a silica gel-preparation procedure. BTEX were analyzed using EPA Method 8260B. 2. Results in bold exceed WQOs and/or ESLs. 3. See Appendix F 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. Sources: WQOs defined in the Central Valley RWQCB Water Quality Control Plan(Basin Plan)for the Sacramento River Basin and San Joaquin 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 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. SAIF T» canPauc ry AWhofy Owned SubsWla Page 1 of 1 F M Science to Solutions