FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

TABLE 2 GROUNDWATER CHEMICAL ANALYTICAL RESULTS-TPH,MTBE,and BTEX1 US CAN-WELTY ROAD Vernalis,California Concentrations reported in pg/L Date Ethyl- Total Sample ID Collected TPHd TPHdsg TPH TPHmo Benzene Toluene benzene Xylenes MTBE SCREENING WQO 100 2 100 2 0.15 3 42 2 29 17 2 LEVELS 100 5 100 5 1 40 5'' 30 5'' 20 5'' WFSMW-115 08/16/06 230 11.12 E <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA (cont.) 08/16/06D 120 11,12 E <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 11/08/06 97011.12 <50 <50 NA <0.5 <0.5 <0.5 <1.5 NA 01/23/07 39011.12 <50 NA NA NA NA NA NA NA Abbreviations: Notes: <=Analyte not detected at or above the laboratory reporting limit shown Values in Bold exceeds either the WQO or ESL or both. BTEX=Benzene,toluene,ethylbenzene,and total xylenes *Starting with the second quarter 2006,laboratory analytical data are being qualified and flagged as appropriate. D=Duplicate sample Please see the respective Data Usability Summary section of the reports for detailed information on the qualifiers used. DRO=Diesel-range organics 1. TPHd(CIO to C25)by EPA Method 8015M prior to third quarter 2006;starting with third quarter 2006, E=Indicates the reported value is estimated due to associated quality control results EPA Method 8015B used.TPHd with silica-gel preparation,EPA Method 8015 M used prior to third quarter 2006; EPA=U.S.Environmental Protection Agency starting with third quarter 2006,EPA Method 8015B used. TPHg (C6 to C12)by EPA Method 8015M prior to third quarter ESL=Environmental Screening Level 2006;starting with third quarter 2006,EPA Method 8015B used. BTEX were analyzed using EPA Method 8021B. ID=Identification 2. WQO(Tastes and Odors)that prohibits adverse tastes and odors or nuisance conditions. MCL=Maximum contaminant level 3. WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. MTBE=Methly tertiary butyl ether 4. WQO(Chemical Constituents)that requires compliance with California drinking water MCLs and generally MW=Monitoring well prohibits adverse effects on beneficial uses. NA=Not analyzed 5. ESL for groundwater protection(drinking water source),based on"Ceiling Level(Nuisance/Aesthetic Concerns)." NS=Not sampled 6. ESL in groundwater for human health protection,based on direct contact exposure pathways and the California RWQCB=Regional Water Quality Control Board Primary MCL. SPO=Separate-phase oil 7. ESL in surface water for the protection of human health. TPH=Total petroleum hydrocarbons 8. Not sampled due to the presence of SPO. TPHd=TPH quantified as diesel-range organics without silica-gel preparation 9. Insufficient water in the well to sample. TPHdsg=TPHd with silica-gel preparation 10.TPHg and BTEX results are reported for the samples collected on February 14,2006. TPHd results are TPHg=TPH quantified as gasoline-range organics reported for the sample collected on March 30,2006. TPHmo=TPH quantified as motor oil 11.The observed sample pattern includes#2 fuel/diesel and an additional pattern that elutes later in the DRO range. gg/L=Micrograms per liter 12.DRO were detected in the method blank.The blank value was not subtracted from the analytical result. WFSMW=Western Farm Service monitoring well 13.Well was not accessible. WQO=Water Quality Objective 14.The duplicate sample was labeled differently on the chain-of-custody form. 15 Well located on Western Farm Service Property. 16.The observed sample pattern includes#2 fuel/diesel,an additional pattern that elutes later in the DRO range and individual peaks eluting in the DRO range. Sources: ESLs from"Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater"(Interim Final), San Francisco Bay RWQCB(February 2005).Most conservative levels are used. WQOs from"Water Quality Control Plan(Basin Plan)for the Sacramento River Basin and the San Joaquin River Basin,"4th ed. (WQOs used are the most conservative outlined in the letter from RWQCB dated April 16,2004-Appendix A-Reports Tri-Regional Board Staff Recommendations for Preliminary Investigation and Evaluation of Underground Tank Sites). z a ___- .J~L-® Page 3 of 3 From Scww roSWukons