ARCHIVED REPORTS_SECOND SEMIANNUAL AND 2011 ANNUAL GROUNDWATER MONITORING REPORT

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i L Table C.2 Historical Groundwater Concentration Data LSFPP,LP-HOLT SITE SAMPLING TPH-E =(GRO) TOLUENE ETHYL- TOTAL COMMENTS L WELL DATE (DRO) BENZENE XYLENES Without Silica Gel (M/D/Y) (mg/L) (ug/L) (ug/L) (ug/L) L 0-1 03/06/08 1.1 39 2.0 0.96 1.8 0-1 09110/08 0.52 0.75 8.3 0.91 0.61 5.5 0-1 03/12/09 1.0 0.97 22 1.0 0.70 2.2 <0.50 1.7 23 1.3 <0.50 5.5 O-1 09/02/09 ' 0-1 03/09/10 <0.50 0.52 17 0.66 <0.50 2.4 j� 0-1 09/06/10 c0.50 1.2 8.9 0.90 <0.50 3.8 0-1 03/02111 <0.50 0.69 60 1.60 3.5 5.3 0-1 09/01/11 <0.50 1.3 7.6 0.53 0.68 1.3 ` RW-1 03/06/08 1.gx 12 3,100 46 260 490 RW-1 09/10/08 0.96 15 3,200 39 440 620 RW-1 03/12/09 1.2 9.0 2,600 25 250 220 RW-1 09/03/09 <0.50 10.0 3,500 49 57 85 RW-1 03/09/10 0.51 7.4 1,800 20 120 39 RW-1 09/09/10 1.1 - 8.8 1,900 25 110 27 RW-1 03/02/11 1.0 6.2 1,100 14 61 26 L RW-1 09/01/11 2.4 5.8 910 11 55 20 Dup N-7 03/06/08 1.0x 39 9,900 610 2,100 4,200 Labeled as DUP-01 Dup N-7 09/10/08 3.5 45 13,000 430 2,100 2,900 Labeled as DUP-01 Dup N-7 03/12/09 1.9 26 10,000 480 2,100 3,200 Labeled as DUP-01 Dup N-7 09/02/09 2.5 40 15,000 340 2,800 3,000 Labeled as DUP-01 Dup N-7 03/09/10 1.1 33 14,000 320 2,000 2,000 Labeled as DUP-01 ` Dup N-7 09/08/10 1.7 43 17,000 440 2,600 2,600 Labeled as DUP-01 Dup N-7 03/02/11 1.6` 33 13,000 410 1,900 1,900 Labeled as DUP-01 Dup N-7 09/01/11 11z 36 7,900 150 1,400 1,100 Labeled as DUP-01 � Dup N-18 40695 <0.50 <0.50 12 0.54 <0.50 0.88 Labeled as DUP-01 EXPLANATION: NA =Not Analyzed L NS =Not Sampled NO =Not Detected at or above laboratory detection limit,as listed at end of table (M/DIY) =Month/Day/Year (pg/L) =micrograms per liter(parts per billion) (mg/L) =milligrams per liter(parts per million) TPH-P(GRO) =Total Petroleum Hydrocarbons(Gasoline Range Organics)=C4-C13 TPH-E(DRO) =Total Petroleum Hydrocarbons(Diesel Range Organics)=C13-C22 0 =The reporting limit was raised due to sample foaming. • =Reporting Limits were increased due to high concentrations of target analytes. H =Reporting limit was increased due to the hydrocarbons present in the sample + =Reported diesel concentration may include some undifferentiated gasoline. L C =Reported concentration includes additional compounds uncharacteristic of common fuels and lubricants. ^ =Reporting Limits were increased due to sample matrix interferences. •• =Reported diesel concentration may include some undifferentiated lighter-end hydrocarbons. ••• =Reported diesel concentration may include some undifferentiated heavier-end hydrocarbons. - =Reported diesel concentration may include some undifferentiated lighter-end hydrocarbons K =DRO concentration may include lighter-end hydrocarbons(e.g.gasoline)that elute in the DRO range. V =Reporting limits were increased due to high concentrations of target analytes. X =Reporting limits increased due to SAMPLE matrix interferences. O =DRO concentration may include contributions from lighter-end hydrocarbons(e.g.gasoline). in. L =DRO concentration may include contributions from heavier-end hydrocarbons that eliute in the DRO range. �.. file: Appendix_C_Historicel_Data.xlsx\Sample Tablet Page 3 of 3