ARCHIVED REPORTS_SEMI-ANNUAL GROUNDWATER MONITORING REPORT AUGUST 2010

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amec,O 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 a /L u /L u /L /L CDPH MCL --- 50 50 50 RWQCB WQG 100 50 50 50 LPW-2 LP-D-061505 06/15/05 <50 10 10 8.4 (cont.) LPW-2 11/17/05 <50 18 10 7.7 LPW-2 05/04/06 <50 <10 <10 8.4 LPW-2 11/15/06 <50 9 J 16 13.3 11 LPW-2 05/23/07'1 <50 39 8.6 J 13 LPW-2 11/15/07 <50 18 14 12 LPW-2 05/13/08 <50 23 14 11 LPW-2 11/24/08 <50 16 16 14 LPW-2 05/14/09 <50 16 13 14 J2 LPW-2 11/23/09 <50 15 13 14 J4 LPW-2 12/22/09 <50 14 12 14 LPW-2 01/26/10 <50 13 11 13 LPW-2 02/17/10 <50 11 11 13 LPW-2 08/25/10 <50 29 12 12 LPW-3 LPW-3 03/11/02 <50 <10 <10 2.6 LPW-3 06/20/02 <50 6 1 J <10 4.0 LP-D-062002 06/20/02 <50 8 J <10 4.0 LPW-3 09/19/02 <50 770/8 J G1 <10 1.3 LPW-3 11/18/02 <50 7 J <10 1.1 LPW-3 05/06/03 <50 40 10 2 LP-D-050603 05/06/03 <50 40 10 2 LPW-3 11/06/03 <50 25 4 J 1.6 LPW-3-051704 05/17/04 <50 <10 <10 1 1.5 LP-D-051704 05/17/04 <50 <10 <10 1.5 LPW-3 11/23/04 <50 20 20 2.4 LPW-3 06/15/05 260 W <10 <10 3.4 LPW-3 11/17/05 <50 <10 <10 2.9 LPW-3 05/04/06 <50 <10 <10 2.1 LPW-3 11/15/06 <50 <10 <10 1.6 11 LC-D-111506 11/15/06 <50 <10 <10 1.7 J1 LPW-3 05/23/07"' <50 4.3 J <10 10.8 LC-D-052307 05/23/07"' 160 W 4.4 J <10 11.6 LPW-3 11/15/07 <50 <10 <10 0.31 J LC-D-111507 11/15/07 <50 <10 I <10 0.67 LPW-3 05/13/08 <50 <10 <10 13 LC-D-051308 05/13/08 <50 <10 <10 13 LPW-3 11/24/08 <50 <10 <10 1.5 LP-D-112408 11/24/08 <50 <10 <10 0.98 LPW-3 05/14/09 <50 <10 <10 2.2 J2/J3 LP-D-051409 05/14/09 <50 <10 <10 3.5 J2/J3 AMEC Geomatrix, Inc. P:\10626.000.0\Docs\Semi-Annua1 Groundwater Monitoring&Sampling\Semi-Annual 1-10\Table 2 Page 2 of 3