FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

TABLE 2 GROUNDWATER CHEMICAL ANALYTICAL RESULTS-TPH,MTBE, and BTEXI US CAN-WELTY ROAD Vernalis,California Concentrations reported in micrograms per liter(µg/L) Abbreviations: <=Analyte not detected at or above the laboratory reporting limit shown D=Duplicate sample E=Indicates the reported value is estimated due to associated quality control results ESL=Environmental Screening Level ID=Identification MTBE=Methly tertiary butyl ether NA=Not analyzed NS=Not sampled TPHd=Total petroleum hydrocarbons quantified as diesel-range organics without silica-gel preparation TPHdsg=TPHd with silica-gel preparation TPHg=Total petroleum hydrocarbons quantified as gasoline-range organics TPHmo=Total petroleum hydrocarbons quantified as motor oil WQO=Water Quality Objective Notes: Values in Bold exceeds either the WQO or ESL or both. *Starting with the second quarter 2006,laboratory analytical data are being qualified and flagged as appropriate.Please see the respective Data Usability Summary section of the reports for detailed information on the qualifiers used. 1. Total petroleum hydrocarbons(CIO to C25)quantified as diesel-range organics by EPA Method 8015M prior to third quarter 2006, starting with third quarter 2006,EPA Method 8015B used.TPHd with silica-gel preparation,EPA Method 8015 M used prior to third quarter 2006, starting with third quarter 2006,EPA Method 8015B used. Total petroleum hydrocarbons(C6 to C12)quantified as gasoline-range organics by EPA Method 8015M prior to third quarter 2006,starting with third quarter 2006,EPA Method 8015B used.Benzene,toluene,ethylbenzene, and total xylenes were analyzed using EPA Method 8021B. 2. Not sampled due to the presence of SPO. 3. Insufficient water in the well to sample. 4. TPHg and BTEX results are reported for the samples collected on February 14,2006. TPHd and PAH results are reported for the sample collected on March 30,2006. 5. The observed sample pattern includes#2 fuel/diesel and an additional pattern that elutes later in the DRO range. 6. The duplicate sample was labeled differently on the chain-of-custody form. 7. DRO were detected in the method blank.The blank value was not subtracted from the analytical result. 8. Well located on Western Farm Service Property. 9. 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. 10.WQO(Tastes and Odors)that prohibits adverse tastes and odors or nuisance conditions. 11.WQO(Toxicity)that prohibits toxic chemicals in toxic amounts. 12.WQO(Chemical Constituents)that requires compliance with California drinking water MCLS and generally prohibits adverse effects on beneficial uses. 13.ESL for groundwater protection(drinking water source),based on"Ceiling Level(Nuisance/Aesthetic Concerns)". 14.ESL in groundwater for human health protection,based on direct contact exposure pathways and the California Primary MCL. 15.ESL in surface water for the protection of human health. 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). Page 3 of 3