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TABLE 1C ADDITIONAL CUMULATIVE GROUNDWATER MONITORING AND SAMPLING DATA- METALS Former Mobil Service Station 99CAS 75 E. Alpine Avenue Stockton, California (Page 3 of 4) W ell Sampling Arsenic Antimony Cadmium Lead Selenium Thallium ID Date (pg/L) (pg/L) (pg/L) W1L} EX1 06!28107 - Present Not analyzed for these analytes. EX2 06/28/07 - Present Not analyzed for these analytes. Grab Groundwater Samples Not analyzed for these analytes. Notes: TOC = Top of well casing elevation. DTW = Depth to water. GW Elev. = Groundwater elevation. NAPL = Non -aqueous phase liquid. TPHd = Total petroleum hydrocarbons as diesel analyzed using EPA Method 8015 (modified). TPHg = Total petroleum hydrocarbons as gasoline analyzed using EPA Method 80158. Prior to 2002, analyzed using EPA Method 8015 (modified) MTBE = Methyl tertiary butyl ether analyzed using EPA Method 8260B. BTEX = Benzene, toluene, ethylbenzene, and total xylenes analyzed using EPA Method 82606; analyzed using EPA Method 8021B during first quarter 2009. PCBs = Polychlorinated biphenyls analysis as Aroclors by EPA Method 8082 includes PCB types 1016, 1221, 1232, 1242, 1248, 1254, and 1260. SVOCs = Semi -volatile organic compounds. ETBE = Ethyl tertiary butyl ether analyzed using EPA Method 82608. TAME = Tertiary amyl methyl ether analyzed using EPA Method 8260B. TBA = Tertiary butyl alcohol analyzed using EPA Method 8260B. EDB = 1,2-dibromoethane analyzed using EPA Method 8260B. 1,2 -DCA = 1,2-dichloroethane analyzed using EPA Method 8260B. DIPE = Di -isopropyl ether analyzed using EPA Method 8260B. Ethanol = Ethanol analyzed using EPA Method 8260B. Metals = Metals analyzed using EPA Method 601013; prior to May 2011, analyzed using EPA Method 6020. Ng/ = Micrograms per liter. ND = Not detected at or above tee laboratory reporting limit. See laboratory analytical report for complete list of analytes and method reporting limits. = Not measured/Not sampled/Not analyzed. < = Less than the stated laboratory reporting limit. a = The sample extract was subjected to silica gel treatment prior to analysis. b = Sample received after recommended holding time. c = Compound did not meet method -described identification guidelines. Identification was based on additional GC/MS characteristics. d = The sample chromatographic pattern does not match that of the specified standard. e = Secondary ion abundances were outside method requirements. Identification based on analytical judgment. f = Analyte was present in the associated method blank.