ARCHIVED REPORTS_SEMI-ANNUAL GROUNDWATER MONITORING REPORT AUGUST 2010

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amen TABLE 2 GROUNDWATER ANALYTICAL RESULTS - LATHROP FACILITY Well Sample ID Date TPH-Diesel Total Cr Dissolved Cr Dissolved Cr VI Identification Sampled Method 8015M Method 6010 Method 6010 Method 7199 Units /L /L /L /L CDPH MCL -- 50 50 50 RWQCB WQG 100 50 50 50 LPW-3 LPW-3 11/23/09 <50 <10 <10 3.7 J4 (cont.) LP-D-112309 11/23/09 <50 <10 <10 4.3 J4 LPW-3 12/22/09 <50 <10 <10 3.5 LP-D-122209 12/22/09 <50 <10 <10 3.4 LPW-3 01/26/10 <50 <10 <10 2.9 LP-D-012610 01/26/10 <50 <10 <10 2.8 LPW-3 02/17/10 <50 <10 <10 7.1 LP-D-021710 02/17/10 <50 <10 <10 6.8 LPW-3 08/25/10 <50 3.2 J <10 5.6 LP-D-082510 08/25/10 <50 3.0 J <10 4.9 Reporting Limit 50 10 10 1 0.5 Method Detection Limit --- 3 3 0.2 Notes: 1.Analysis conducted by Agriculture and Priority Pollutants Laboratories,Inc.(APPL,Inc.)in Clovis,California. TPH-diesel=diesel range total petroleum hydrocarbons. Cr=chromium. Cr VI=hexavalent chromium(or Chromium VI). ug/L=micrograms per liter. CDPH MCL=California Department of Public Health Maximum Contaminant Level for Cr in drinking water. WQG=Water Quality Goal,Central Valley Regional Water Quality Control Board(RWQCB). <=not detected at or above the Reporting Limit(RL)or Method Detection Limit(MDL). J=estimated concentration between the RL and MDL. J1 =estimated value;sample was analyzed outside the holding time for Cr VI by the laboratory. J2=estimated value;the percent recovery of the MS and MSD are above the laboratory control limits;therefore,the sample results are estimated and potentially biased high. J3=estimated concentration due to the absolute difference between the primary and duplicate results which exceeds the reporting limit (Relative Percent Difference or RPD not calculated because the result for the primary sample is less than 5 times the reporting limit). 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. G=sample was reported by URS to be cloudy and the initial analytical result for Total Cr was 120 ug/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 13 ug/L. G1 =sample was reported by URS to be highly turbid and the initial reported analytical result for Total Cr was 770 ug/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 ug/L. W=weathered diesel or other petroleum hydrocarbons with higher boiling points. Bold=concentrations exceed screening criteria. Listed data before June 2005 are from the URS Semi-Annual Groundwater Report(November 2004&December 2004). AMEC Geomatrix, Inc. P:\10626.000.0\Docs\Semi-Annual Groundwater Monitoring&Sampling\Semi-Annual 1-10\Table 2 Page 3 of 3