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TABLE 4 <br /> SUMMARY OF GROUNDWATER ANALYTICAL RESULTS (TPHd and BTEX) 1,2,3 <br /> MOUNTAIN HOUSE DEVELOPMENT SITE#6 <br /> Mountain House, San Joaquin County, California <br /> Concentrations in Itg/L unless noted <br /> Abbreviations: <br /> <=Denotes analyte not detected at or above the laboratory reporting limit <br /> BTEX=Benzene,toluene,ethylbenzene,and total xylenes <br /> D=Duplicate sample <br /> E=Estimated value based on surrogate recovery levels <br /> EPA=U.S.Environmental Protection Agency <br /> ESL=Environmental Screening Level <br /> G =Grab groundwater sample collected using peristaltic pump and prepacked well screen. <br /> HP=Depth-discrete sample collected using Hydropunch equipment,peristaltic pump,and pre-packed well screen <br /> ID=Identification <br /> NA=Not analyzed <br /> RWQCB=Regional Water Quality Control Board <br /> SAIC=Science Application International Corporation <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 /> µg/L=Micrograms per liter <br /> Notes: <br /> 1. Samples were collected by SAIC and analyzed by Lancaster Laboratories,Inc. TPHd were analyzed using EPA <br /> Method 8015 Modified performed both with and without a silica gel-preparation procedure. BTEX were analyzed <br /> using EPA Method 8260B. <br /> 2. Results in bold exceed WQOs and/or ESLs. <br /> 3. See Appendix E.1 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 from the Central Valley Region RWQCB Water Quality Control Plan(Basin Plan)for the Sacramento <br /> River Basin and the San Joaquin River Basin,4th ed.(Revised August 2006). <br /> ESLs from the San Francisco Bay RWQCB Screening for Environmental Concerns at Sites with Contaminated <br /> Soil and Groundwater(Interim Final November 2007[Revised May 2008]). <br /> ---sG:,iii <br /> Page 2 of 2 From Science to sululivns <br />