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Table 2.3 SUMMARY OF GROUNDWATER MONITORING RESULTS Former UST Area,Tracy High School 315 E 11th St Tracy,California v y m a r c 0 .a a °1 ani v y �ra ro A O S A v n x 0 W z H (ft msl) (ft) (ft msl) (ug/L) (ug(L) (ug/L) (ug/L) (ug/L) ESL 210 210 1,500 43 24 100 TP-W-12' 03/15/07 N/A 12 N/A 620,000 27,000 NA 1,600 NA 110 P-19 1 05/17/07 50.03 9.42 40.61 1 190 B 100 NA NA ND NA P-20 05/17/07 50.07 9.45 40.6 130 B ND NA NA ND NA P-21 05/17/07 49.99 1 9.33 40.66 8,200 B 11,000 NA NA 490 NA P-22 05/17/07 50.31 9.64 40.67 51 BJ ND NA NA ND NA SBD-1 07/12/07 N/A 9 N/A 28J 120 1.6j ND ND ND SBD-1 07/12/07 N/A 23.5 N/A 32J 210 ND ND 0.25 J ND MW-5 04/23/08 49.22 7.05 4217 280 170 NA <0.17 <0.24 <0.28 MW-5 1 08/15/08 50.38 9.03 41.35 83J 160 NA <1.1 <1.6 <1.9 MW-5 12/09/08 50.38 1 9.01 41.37 160131 70J NA <0.17 <0.24 <0.28 MW-5 03/10/09 50.38 8.38 42.00 <46 29 J NA <0.17 <0.24 <0.28 MW-6 04/23/08 50.60 8.50 4210 <47 <28 NA <0.17 <0.24 <0.28 MW-6 08/15/08 50.60 9.24 41.31 <47 <28 NA <0.17 <0.24 <0.28 MW-6 03/10/09 50.60 8.64 41.96 <46 29 J NA <0.17 <0.24 <0.28 MW-7 1 04/22/08 50.98 6.25 44.73 68J <28 NA <0.17 <0.24 <0.28 MW-7 08/15/08 50.98 10.09 40.08 <47 <28 NA <0.17 <0.24 <0.28 MW-7 12/09/08 50.98 10.05 40.93 87J,B(<1001) 37J NA <0.17 <0.24 <0.28 MW-7 03/10/09 50.98 9.37 41.61 <47 <28 NA <0.17 <0.24 <0.28 Notes: All analytes detected by 8260B unless otherwise noted TOC Elevation at north side of the top of well casing referenced to MacArthur USGS Datum DTW Depth to water GWE Groundwater elevation TPH-DRO Total petroleum hydrocarbons as diesel range organics by EPA Method 8015M TPH-GRO Total petroleum hydrocarbons as gasoline range organics by EPA Method 8260B ft msl feet above mean sea level ft feet ug/L micrograms per liter N/A Information not availble because groundwater sample collected from excavation ND Not detected in concentrations exceeding the indicated laboratory method detection limit NA Not analyzed for J Lab estimated detection level B Sample contained concentrations of target analyte at a reportable level with the associated method blank. <### ND,but detection limit used to plot concentration trends in Appendix D. ESL Environmental Screening Level from Table F-lb.Groundwater Screening Levels (groundwater is not a current or potential drinking water resource) NE Not Established 1 Designation changed to non-detect at the detection limit shown 055779(2)