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Table B-I : Historical Groundwater Measurements and Analytical Results <br />SAMPLE <br />LOCATION <br />top of casing <br />elevation <br />DATE <br />SAMPLED <br />DEPTH TO <br />GROUNDWATER <br />(Feet bgs) <br />GROUNDWATER <br />ELEVATION <br />(Feet ms 1) TPH-K TPH-MO TP 11-11 <br />q. <br />TPII-G BENZENE TOLUENE <br />ETHYL- <br />BENZENE XYLENES MTBE DIPE ETBE TAME TEA 1,2-DCA EDB Naphthalene <br />Method ))015M 80I5M 811I5M 8015M 8021B 9021B 5112113 80210 8260B 526013 /426013 82608 8260B 826099 02608 . 82611B <br />MCL None None 56 mg,'L ' 5 1.1g,L ' 1 II ng L 150 ag L 300 pit'L 1,751) pc L II ag L None None None 12 uq./L 0.534/L 0.05 pg.1... <br />NOTES All measurements and data dated prior to Jute 2010 were p ovided by Ramage Environmental. Condor Earth Technologies, Inc. is not responsible for the accuracy and completeness of information collected and de ,eloped by others. <br />All results are reported in micrograms per liter (ug,11) which translates o parts per billion (ppb) <br />Total Petroleum Hydrocarbons as Diesel (TPH-D) analyzed by EPA Methcd 8015M <br />Total Petroleum Hydrocarbons as Gasoline (TPH-G), benzene, toluene, ethylbenzene, xylenes by EPA Method 8260B or 8021B/8015M <br />Oxygenates: Methyl-t-butyl ether (MTBE), Di-isopropyl ether (D1PE), Ethyl-t-butyl ether (ETBE), Tert-amyl methyl ether (TAME) and Tert-Butanol (TEA) by EPA 8260B <br />1,2-Dichlomethane (1,2-DCA) and 1,2-dibromoethane (EDB) analyzed by EPA Method 82608 <br />0.5 = Not Detected at reporting limit of 0.5 ppb <br />NA = Not analyzed for specified compound <br />- Sample chromatograph does not resemble fuel standard used for quantitation, result is estimated <br />en - Result is elevated due to the presence of single analyte peak(s) in the quantitation range <br />00 Samples SVE-2B, collected on 3/21/2013 and 12/09/2013 were incorrectly identified in the field as VW-2B. <br />MCL = Maximum Concentration Level, from California Department of Public Health, in micrograms per liter, pg/L <br />None = MCL is not available <br />Method = United States Environmental Protection Agency Analytical Method <br />= notification level, not a MCL bgs = below ground surface <br />'= EPA Health Advisory level and Taste and Odor Threshold msI = mean sea level <br />Wellhead elevations and locations survey by Morrow Surveying in April 1999, December 2001, December 2003, and April 2005 Basis of elevations: City of Stockton Benchmark 0113 (Elevation = 19.51 Feet). <br />result with EPA Method 8270C analysis. <br />4= result with EPA Method 8260B analysis; EPA Method 8270C analytical result was 2,000 ug/L. <br />X:\Project\5000_pq \ 5960 SJC UST RFQ\5960C County of San Joaquin - SJC Public Works \596006 \ Reports Mork Plan \Ape B Background120161229_5960C5A Historic Data.xlsxTable B-1 8 of 8