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TABLE 1A <br />CUMULATIVE GROUNDWATER MONITORING AND SAMPLING DATA <br />Former Mobil Service Station 99CAS <br />75 E. Alpine Avenue <br />Stockton, California <br />(Page 7 of 7) <br />Notes: <br />TOC = Top of well casing elevation; datum is mean sea level. <br />DTW = Depth to water. <br />GW Elev. = Groundwater elevation; datum is mean sea level. <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 80156. 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 />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 826013. <br />EDB = 1,2-dibromoetcane analyzed using EPA Method 826013. <br />1,2 -DCA = 1,2-diccloroetcane analyzed using EPA Method 826013. <br />DIPE = Di -isopropyl ether analyzed using EPA Method 8260B. <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 />Arsenic = Arsenic analyzed using EPA Method 601013; prior to May 2011, analyzed using EPA Method 6020. <br />Cadmium = Cadmium analyzed using EPA Method 60106; prior to May 2011, analyzed using EPA Method 6020. <br />Lead = Lead analyzed using EPA Method 6010B; prior to May 2011, analyzed using EPA Method 6020. <br />Selenium = Selenium analyzed using EPA Method 601013; prior to May 2011, analyzed using EPA Method 6020. <br />Thallium = Thallium analyzed using EPA Method 601013; prior to May 2011, analyzed using EPA Method 6020. <br />Antimony = Antimony analyzed using EPA Method 60106; prior to May 2011, analyzed using EPA Method 6020. <br />Ng/L = Micrograms per liter. <br />ND = 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 />< = Less than the stated laboratory reporting limit. <br />a = Unable to locate well. <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 sample chromatographic pattern for TPH does not match the chromatographic pattern of the specified standard. Quantitation of the unknown hydrocarbon(s) in the sample <br />was based upon 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 = Samples analyzed by EPA Method 8021B (M). <br />I = Laboratory Control Sample and/or Laboratory Control Sample Duplicate was above the acceptance limits. Analyte not detected, data not impacted. <br />m = The sample extract was subjected to silica gel treatment prior to analysis. <br />