ARCHIVED REPORTS_FIRST SEMIANNUAL AND 2014 ANNUAL GROUNDWATER MONITORING REPORT

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Table C.2 Historical Groundwater Concentration Data SFPP,LP-HOLT SITE SAMPLING TPH-E TPH-P BENZENE TOLUENE ETHYL- TOTAL COMMENTS WELL DATE (DRO) (GRO) BENZENE XYLENES Without Silica Gel (M/D/Y) (mg/L) (mg/L) (ug/L) (ug/L) (ug/L) (ug/L) N-16 09/08/10 <0.50 1.6 49 1.5 15 4.9 N-16 03/02/11 0.53 1.6 12 0.85 6.2 1.5 N-16 09/01/11 2.0 1.9 30 0.88 7.3 1.5 N-16 03/02/12 <0.50 0.69 8.7 <2.50 <2.50 <2.50 N-16 09/07/12 <0.50 0.63 2.8 <0.50 1.3 <0.50 N-16 03/12/13 <0.50 0.63 0.57 <0.50 <0.50 <0.50 N-16 09/13/13 0.75 0.57 2.2 <0.50 0.95 0.56 N-16 03/05/14 <0.50 0.70 0.67 <0.50 1.5 <0.50 N-17 09/08/10 1.4 3.2 120 2.4 26 6.0 N-17 03/02/11 0.52 1.5 19 1.1 3.0 8.1 N-17 09/01/11 1.0 2.3 100 1.4 8.6 9.9 N-17 03/02/12 <0.50 2.1 140 <2.5° 6.5 13 N-17 09/07/12 0.97 Z 1.3 33 0.89 3.0 1.8 N-17 03/12/13 1.2 2.2 15 <1.01 1.8 2.1 N-17 09/13/13 0.76 1.9 21 0.81 2.1 2.2 N-17 03/05/14 8.6 1.5 2.1 0.67 0.74 1.6 N-18 03/21/11 <0.50 <0.50 11 <0.50 <0.50 0.83 Resample from 3/2/11 N-18 06/01/11 <0.50 <0.50 12 0.59 <0.50 0.93 Quarterly Sample N-18 09/01/11 <0.50 0.66 29 1.2 0.60 2.0 N-18 03/02/12 <0.50 <0.50 <1.00 <1.0° <1.00 <1.00 N-18 09/07/12 <0.50 <0.50 7.1 <0.50 <0.50 0.56 N-18 03/12/13 <0.50 <0.50 1.9 <0.50 <0.50 <0.50 N-18 09/13/13 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-18 03/05/14 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-19 09/08/10 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-19 03/02/11 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-19 09/01/11 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-19 03/02/12 <0.50 <0.50 <1.00 <1.00 <1.00 <1.00 N-19 09/07/12 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-19 03/12/13 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-19 09/13/13 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-19 03/05/14 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 09/08/10 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 03/02/11 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 09/01/11 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 03/02/20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 09/07/12 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 03/12/13 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 09/13/13 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-20 03/05/14 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-24 09/08/10 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-24 03/02/11 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-24 09/01/11 0.53CL <0.50 2.7 <0.50 <0.50 <0.50 N-24 03/02/20 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-24 09/07/12 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-24 03/12/13 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-24 09/13/13 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 N-24 03/05/14 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 file: Append ix_C_Historical_Data.xlsx\Sample Table2 Page 2 of 3