Former Fort Ord Sites 2 and 12 Data and Status

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1 Former Fort Ord Sites / Table : Sites / GWTP and SVTU Statistics as of April, 06 COC Mass Monthly Statistics Volume Treated Average Flow Percent of Time Online Removed (pounds) April 06 GWTP,304,0 gal 3 gpm Total since April Billion gal 47 April 06 SVTU 33,039,740 scf 90 scfm Total since Sept Billion scf 4.9 Table : April 06 Sites / Treated Water Analytical Results at TS INJ COC Discharge Limit (µg/l) Sample Date / Analytical Results 4/9/06, Dichloroethene (, DCE) 6.0 ND, Dichloroethane (, DCA) 0.0 ND,3 dichloropropene (,3 DCP) 0.0 ND Chloroform.0 ND cis, dichloroethene (cis, DCE) Tetrachloroethene (PCE) 3.0 ND Trichloroethene (TCE).0 ND Vinyl Chloride (VC) 0.0 ND April 06 Key Events for Sites / None May 06 Scheduled Events for Sites / May 8: Second quarter soil gas sampling event begins. Former Fort Ord Sites and Data and Status HTW BCT Meeting, May 9, 06 Table 3. Sites / Select Groundwater Extraction/Monitoring Well Data Select COC Concentrations (µg/l) 4Q 0 Q 06 4Q 0 Q 06 Well Identification TCE PCE ACL: EW 0 80M EW 06 80M J.8 EW 07 80M EW 08 80U MW 09R J 0.7J MW 4 80M J 0.8 J MW 6 80M* J 0.8 J MW 0 80U J MW 80U 0. J ND 0.6 J 3. MW 4 80U 0. J 0. J MW 80U ND ND MW 3 80M J 0.9 J Notes: The reported value is the sum of both cis and trans isomers. Discharge limits are the ACLs for injection over the plume. 3 Extraction wells not listed have met the QAPP decision rules to no longer operate. 4 Concentration in bold is equal to or exceeds the Aquifer Cleanup Level (ACL). MW 6 80M, DCA 0. µg/l 4Q 0 and 0. µg/l Q 06 J: Estimated results below the limit of quantitation (LOQ). gal: gallon(s) ND: The analyte was not detected at or above the limit of detection (LOD). gpm: gallon(s) per minute COC: chemical of concern NS: Not sampled scf: standard cubic foot or feet scfm: standard cubic feet per minute µg/l: micrograms per liter HTW BCT May 9, 06

2 Wells Meeting QAPP Criteria for Sample Frequency Change* Sites /, OU and OUCTP Sample Frequency Changes BCT Meeting May 9, 06 Primary Chemical(s) of Figure, Sites and Concern MW--8-80U Q Meets decision criteria to reduce from quarterly sampling to annual sampling TCE and PCE MW--9-80U Q Meets decision criteria to reduce from quarterly sampling to annual sampling TCE and PCE Notes: *Based on data collected through the st quarter of 06. Q = Well currently sampled on a quarterly schedule If four consecutive quarters of monitoring data show concentrations of COCs below their respective LOQs, or below 0% of their respecitve ACLs, whichever is greater, then the well may be proposed for annual sampling (Ahtna, 06). Quality Assurance Project Plan (QAPP), Former Fort Ord, California, Volume I, Appendix A, Final Revision 4, Groundwater Remedies and Monitoring at Operable Unit, Sites and, and Operable Unit Carbon Tetrachloride Plume, March. (QAPP, AR# BW 78A) Proposed Schedule Changes For June '6.xlsx

3 EXPLANATION. Monitoring Well with TCE Detection, and No ACL Exceedances by Other COCs Monitoring Well with PCE Detection Monitoring Well with TCE and PCE Detection 0 00,000 Feet? MW--9-80U Extraction Well with TCE and PCE Detection Meets decision criteria to reduce from quarterly sampling to annual sampling as defined in Volume I, Appendix A of the Final Revision 4 QAPP (Army, 06). Monitoring Well - TCE or PCE not detected and no other COC ACL exceedances CB Monitoring Well not sampled this quarter Piezometer not sampled this quarter Thursday, April 8, 06 9:4:3 AM S:\FAR\FtOrdGW\ \Meetings_0\Task0\6_047_SampFreq\Figure0_0-U80_6Q.mxd MONTEREY BAY WEST SHAD PORTIONS OF SCHEMATIC CROSS SECTION INDICATE AQUIFERS SCHEMATIC CROSS SECTION- FORT ORD HYDROSTRATIGRAPHY MAIN GARRISON COMBIN A AND UPPER 80-FOOT AQUIFER IINTERMIATE 80-FOOT AQUITARD CONTOUR ON THIS MAP 80-FOOT (LOWER) 400-FOOT 80-FOOT (UPPER) A-AQUIFER 400-FOOT FO-SVA EAST SALINAS VALLEY SVA MW--9-80U MW--8-80U " D IMJIN PKWY NOTES: Extraction Well not sampled this quarter Injection Well not sampled this quarter Chemical of Concern (COC) Aquifer Cleanup Level (ACL) Exceedance Contour in µg/l Tetrachloroethene (PCE) Roads Facilities Former Fort Ord Boundary () Contours are based on one interpretation of the data that were available at the time this report was prepared; other interpretations may be possible. () Contours based on highest value obtained from multiple bags where applicable. (3) Other COC ACL exceedances detected beyond the extent of the PCE plume are illustrated when present. SAMPLE FREQUENCY CHANGES SITES AND UPPER 80-FOOT AQUIFER Based on Data Collected Through First Quarter 06 Former Fort Ord, California Figure Date: 4/06 Project No

4 Concentration (micrograms per liter) 0 9 Trichloroethene 8 Non Detect Trichloroethene 7 Tetrachloroethene 6 Non Detect Tetrachloroethene Trichloroethene Aquifer Cleanup Level (.0 µg/l) Tetrachloroethene Aquifer Cleanup Level (.0 µg/l) Date Note: Non-detect values are posted as the limit of detection Trichloroethene and Tetrachloroethene Concentrations Over Time MW--8-80U Results through st Quarter 06 Former Fort Ord Former Fort Ord, California DRAWN ZC Graph

5 Concentration (micrograms per liter) Trichloroethene 7 Non Detect Trichloroethene 6 Tetrachloroethene 4 Non Detect Tetrachloroethene Trichloroethene Aquifer Cleanup Level (.0 µg/l) Tetrachloroethene Aquifer Cleanup Level (.0 µg/l) Date Note: Non-detect values are posted as the limit of detection Trichloroethene and Tetrachloroethene Concentrations Over Time, MW--9-80U Results through st Quarter 06 Former Fort Ord Former Fort Ord, California DRAWN ZC Graph

6 Former Fort Ord Sites / HTW BCT May 9, 06 Soil Gas and SVE Sampling Results First Quarter 06 SVETS process sampling results show COC concentrations below SG SLs at all SVE wells. TCE concentrations below SG SLs at all probes except SG 7 7 where TCE was,300 µg/m 3. All PCE concentrations below the SGCL. Slide