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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 11 of 11) <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 80158. Prior to 2002,analyzed using EPA Method 8015(modified). <br /> MTBE = Methyl tertiary butyl ether analyzed using EPA Method 82608. <br /> BTEX = Benzene,toluene,ethylbenzene,and total xylenes analyzed using EPA Method 82608;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 82608. <br /> TAME = Tertiary amyl methyl ether analyzed using EPA Method 82608. <br /> TBA = Tertiary butyl alcohol analyzed using EPA Method 8260B. <br /> EDB = 1,2-dibromoethane analyzed using EPA Method 82608. <br /> 1,2-DCA = 1,2-dichloroethane analyzed using EPA Method 8260B. <br /> DIPE = Di-isopropyl ether analyzed using EPA Method 82608. <br /> Ethanol = Ethanol analyzed using EPA Method 82608. <br /> Metals = Metals analyzed using EPA Method 601013;prior to May 2011,analyzed using EPA Method 6020. <br /> pg/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 />