ARCHIVED REPORTS_SUMMARY OF GROUNDWATER MONITORING

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TABLE 2 amed--* GROUNDWATER ANALYTICAL RESULT S - LATHROP FACILITY Sample TPH-Diese12 Total Cr3 Dissolved Cr Dissolved Cr VI4 Well ID Sample ID Date Method 8015M Method 6010 Method 6010 Method 7199 CDPH MCLS __6 50 50 50 RWQCB WQG 100 5n 50 50 LPW-3 LP-D-012610 01/26/10 <50 <10 <10 2.8 (cont'd) LPW-3 02/17/10 <50 <10 <10 7.1 LP-D-021710 02/17/10 <50 <10 <10 6.8 Reporting Limit 50 10 10 0.5 Method Detection Limit -- 3 3 0.2 Notes: 1. Listed data before June 2005 are from the URS Semiannual Groundwater Report(November and December 2004). Bold values indicate concentrations exceed screening criteria. 2. TPH-diesel=diesel range total petroleum hydrocarbons. 3. Total Cr=total chromium. 4. Cr VI =hexavalent chromium (or Chromium VI). 5. CDPH MCL= California Department of Public Health Maximum Contaminant Level for Cr in drinking water. 6. "--"= not applicable. 7. RWQCB WQG = Regional Water Quality Control Board-Central Valley Region, Water Quality Goal 8. "<"= not detected at or above the reporting limit(RL) or method detection limit(MDL). 9. J =estimated concentration between the RL and MDL. 10. W=weathered diesel or other petroleum hydrocarbons with higher boiling points. 11. J1 =estimated value; sample was analyzed outside the holding time for Cr VI by the laboratory. 12. Analysis conducted by Agriculture and Priority Pollutants Laboratories, Inc., in Clovis, California. 13. J2=estimated value;the percent recovery of the matrix spike (MS) and matrix spike duplicate (MSD) are above the laboratory control limits; therefore,the sample results are estimated and potentially biased high. 14. J4=estimated value; the percent recovery of the MS and MSD are below the laboratory control limits; therefore, the sample results are estimated and potentially biased low. 15. G= sample was reported by URS to be cloudy and the initial analytical result for total Cr was 120 micrograms per liter(Ng/L). Due to turbidity, the sample was centrifuged and filtered through 47 millimeter(mm) glass fiber filter reanalysis prior to digestion and reanalysis. Total Cr concentration after was reported at 13 pg/L. 16. G1 =sample was reported by URS to be highly turbid and the initial reported analytical result for Total Cr was 770 pg/L. Due to turbidity, the sample was centrifuged and filtered through 47 mm glass fiber filter prior to digestion and reanalysis. Total Cr concentration after reanalysis was reported at 8 J pg/L. 17. J3=estimated concentration due to the absolute difference between the primary and duplicate results, which exceeds the RL(relative percent difference not calculated because the result for the primary sample is less than 5 times the RL). AMEC Geomatrix, Inc. P:\10626.000.0\Docs\Semi-Annua1 Groundwater Monitoring&Sampling\Lathrop Monthly Groundwater Monitoring\Tables\Tab1e_2.xls Page 3 of 3