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TABLE 3 <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS(TPHd and BTEX)1,2,3 <br /> US CAN-WELTY ROAD <br /> Vernalis, San Joaquin County,California <br /> Concentrations inµg/L <br /> Boring/ I Collection Date Ethyl- Total <br /> Well ID Method Sampled TPHd TPHdsg Benzene Toluene benzene Xylenes <br /> SCREENING WQO 100 4 100 4 0.15 5 42 4 29 4 17 4 <br /> LEVELS ESL 100 6 100 6 1 7 40 6 30 6 20 6 <br /> SB-44 ggw 7/20/2010 <50 NA <0.1 <1.0 <1.0 <1.0 <br /> SB-44 D ggw 7/20/2010 63 <50 <0.1 <1.0 <1.0 <1.0 <br /> SB-45 99W 7/22/2010 <50 NA <0.1 <1.0 <1.0 <1.0 <br /> SB-46 ggw 1 7/21/2010 3,100 200 <0.1 <1.0 <1.0 <1.0 <br /> SB-47 I ggw 7/21/2010 100 <50 <0.1 <1.0 <1.0 <1.0 <br /> Abbreviations: <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> D=Duplicate sample <br /> E=Estimated value based on surrogate recovery levels <br /> EPA=United States Environmental Protection Agency <br /> ESL=Environmental Screening Level <br /> ggw =Grab groundwater <br /> ID=Identification <br /> MCL=Maximum Contaminant Level <br /> NA=Not analyzed <br /> RWQCB=Regional Water Quality Control Board <br /> SAIC-Benham=The Benham Companies,LLC,an SAIC Company <br /> TPHd=Total petroleum hydrocarbons quantified as diesel,C10-C25 <br /> TPHdsg=Total petroleum hydrocarbons quantified as diesel with silica-gel cleanup. <br /> WQO=Water Quality Objective <br /> <=Denotes analyte not detected at or above the laboratory reporting limit <br /> gg/L=Micrograms per liter <br /> Notes: <br /> 1. Samples were collected by SAIC-Benham and analyzed by Lancaster Laboratories,Inc. TPHd were analyzed <br /> using EPA Method 8015 Modified performed both with and without a silica gel-preparation procedure. <br /> BTEX were analyzed using EPA Method 8260B. <br /> 2. Results in bold exceed WQOs and/or ESLs. <br /> 3. See Appendix F for data usability summary. <br /> 4. WQO(Tastes and Odors)that prohibits adverse tastes and odors or nuisance conditions. <br /> 5. WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. <br /> 6. ESL(for protection or current or potential drinking water resource)based on Ceiling Value. <br /> 7. ESL(for protection or current or potential drinking water resource)based on Drinking Water Toxicity. <br /> Sources: <br /> WQOs defined in the Central Valley RWQCB Water Quality Control Plan(Basin Plan)for the Sacramento River <br /> Basin and San Joaquin River Basin (Fourth Edition),October 2007. <br /> WQOs may be stated in either numerical or narrative form. Narrative water quality objectives are interpreted by <br /> values from SWRCB A Compilation of Water Quality Goals-July 2008. <br /> ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated Soil <br /> and Groundwater (Interim Final),May 2008. <br /> =A_� The Benham Companies LLC <br /> A Wholly Owned Subsidiary <br /> Page 1 of 1 from sr+enco to soluhons <br />