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TABLE 1A <br />CUMULATIVE GROUNDWATER MONITORING AND SAMPLING DATA <br />Former Mobil Service Station 99CAS <br />75 East Alpine Avenue <br />Stockton, California <br />(Page 13 of 13) <br />Notes: <br />TOC = Top of well casing elevation. <br />DTW = Depth to water. <br />GW Elev. = Groundwater elevation. <br />NAPL = Non -aqueous phase liquid. <br />TPHd = Total petroleum hydrocarbons as diesel analyzed using EPA Method 8015 (modified). <br />TPHg = Total petroleum hydrocarbons as gasoline analyzed using EPA Method 8015B. Prior to 2002, analyzed using EPA Method 8015 (modified). <br />MTBE = Methyl tertiary butyl ether analyzed using EPA Method 826013. <br />BTEX = Benzene, toluene, ethylbenzene, and total xylenes analyzed using EPA Method 826013; analyzed using EPA Method 8021 B during first quarter 2009. <br />PCBs = Polychlorinated biphenyls analysis as Aroclors by EPA Method 8082 includes PCB types 1016, 1221, 1232, 1242, 1248, 1254, and 1260. <br />SVOCs = Semi -volatile organic compounds. <br />ETBE = Ethyl tertiary butyl ether analyzed using EPA Method 8260B. <br />TAME = Tertiary amyl methyl ether analyzed using EPA Method 8260B. <br />TBA = Tertiary butyl alcohol analyzed using EPA Method 8260B. <br />EDB = 1,2-dibromoethane analyzed using EPA Method 8260B. <br />1,2 -DCA = 1,2-dichloroethane analyzed using EPA Method 8260B. <br />DIPE = Di -isopropyl ether analyzed using EPA Method 8260B. <br />Ethanol = Ethanol analyzed using EPA Method 8260B. <br />Metals = Metals analyzed using EPA Method 601013; prior to May 2011, analyzed using EPA Method 6020. <br />Ng/L = Micrograms per liter. <br />ND = Not detected at or above the laboratory reporting limit. See laboratory analytical report for complete list of analytes and method reporting limits. <br />= Not measured/Not sampled/Not analyzed. <br />< = Less than the stated laboratory reporting limit. <br />a = The sample extract was subjected to silica gel treatment prior to analysis <br />b = Sample received after recommended holding time. <br />c = Compound did not meet method -described identification guidelines. Identification was based on additional GC/MS characteristics. <br />d = The chromatographic pattern does not match that of the specified standard. <br />e = Secondary ion abundances were outside method requirements. Identification based on analytical judgment. <br />f = Analyte was present in the associated method blank. <br />g = Hydrocarbon result partly due to individual peak(s) in quantitation range. <br />h = Sample filtered in lab. <br />i = Analyte presence was not confirmed by second column or GC/MS analysis. <br />j = Analyte was detected at a concentration at or below the reporting limit and above the laboratory method detection limit. Reported value is estimated. <br />k = Headspace reported in sample container. <br />I = Well not sampled due to drilling activities in the vicinity of the well. <br />m = Well gauged and/or sampled annually. <br />n = Well gauged and/or sampled semi-annually. <br />o = Unable to sample due to pump malfunction. <br />P = Unable to open well. <br />