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TABLE IC <br />ADDITIONAL CUMULATIVE GROUNDWATER MONITORING AND SAMPLING DATA- METALS <br />Former Mobil Service Station 99CAS <br />75 East Alpine Avenue <br />Stockton, California <br />(Page 4 of 4) <br />Notes: <br />TOC <br />= Top of well casing elevation. <br />DTW <br />= Depth to water. <br />GW Elev. <br />= Groundwater elevation. <br />NAPL <br />= Non -aqueous phase liquid. <br />TPHd <br />= Total petroleum hydrocarbons as diesel analyzed using EPA Method 8015 (modified). <br />TPHg <br />= Total petroleum hydrocarbons as gasoline analyzed using EPA Method 80158. Prior to 2002, analyzed using EPA Method 8015 (modified). <br />MTBE <br />= Methyl tertiary butyl ether analyzed using EPA Method 826013. <br />BTEX <br />= Benzene, toluene, ethylbenzene, and total xylenes analyzed using EPA Method 826013; analyzed using EPA Method 8021 B during first quarter 2009. <br />PCBs <br />= Polychlorinated biphenyls analysis as Aroclors by EPA Method 8082 includes PCB types 1016, 1221, 1232, 1242, 1248, 1254, and 1260. <br />SVOCs <br />= Semi -volatile organic compounds. <br />ETBE <br />= Ethyl tertiary butyl ether analyzed using EPA Method 8260B. <br />TAME <br />= Tertiary amyl methyl ether analyzed using EPA Method 8260B. <br />TBA <br />= Tertiary butyl alcohol analyzed using EPA Method 826013. <br />EDB <br />= 1,2-dibromoethane analyzed using EPA Method 826013. <br />1,2 -DCA <br />= 1,2-dichloroethane analyzed using EPA Method 8260B. <br />DIPE <br />= Di -isopropyl ether analyzed using EPA Method 826013. <br />Ethanol <br />= Ethanol analyzed using EPA Method 8260B. <br />Metals <br />= Metals analyzed using EPA Method 601013; prior to May 2011, analyzed using EPA Method 6020. <br />pg/L <br />= Micrograms per liter. <br />ND <br />= Not detected at or above tee laboratory reporting limit. See laboratory analytical report for complete list of analytes and method reporting limits. <br />= Not measured/Not sampled/Not analyzed. <br />< <br />= Less than the stated laboratory reporting limit. <br />a <br />= The sample extract was subjected to silica gel treatment prior to analysis. <br />b <br />= Sample received after recommended holding time. <br />c <br />= Compound did not meet method -described identification guidelines. Identification was based on additional GC/MS characteristics. <br />d <br />= The chromatographic pattern does not match that of the specified standard. <br />e <br />= Secondary ion abundances were outside method requirements. Identification based on analytical judgment. <br />f <br />= Analyte was present in the associated method blank. <br />g <br />= Hydrocarbon result partly due to individual peak(s) in quantitation range. <br />h <br />= Sample filtered in lab. <br />I <br />= Analyte presence was not confirmed by second column or GC/MS analysis. <br />I <br />= 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 <br />= Headspace reported in sample container. <br />I <br />= Well not sampled due to drilling activities in the vicinity of the well. <br />m <br />= Well gauged and/or sampled annually. <br />n <br />= Well gauged and/or sampled semi-annually. <br />o <br />= Unable to sample due to pump malfunction. <br />P <br />= Unable to open well. <br />