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TABLE IA <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 8) <br />We•i <br />Sampling TOC DTW GW Elev. NAPL TPHd TPHg O&G MTBE B <br />T E X PCBs SVOCS <br />ID <br />Date (feet) (feet) (feet) (feet) (pgiQ (Pg'L) (pg(L) (pg/L) (UglL) <br />(pg/L) (us+'L) (Ng/L) <br />Grab Groundwater <br />Samples <br />W-34-SVE1 <br />09/26/11 — — — — 2,900d 9,800d — 450 4,800 <br /><100 <100 <100 <br />W-34.5SVE2 <br />09/26/11 — — — — 20,000d 140,000 — <500 7,100 <br />51,000 4,900 28,000 <br />W-35-AS3 <br />09/20/11 — -- — — 92,000d 42,000,000k — <1,000 30,000 <br />100,000 13,000 69,000 <br />W-45-AS4 <br />08/24/11 — — — — 64,000d 190,000 — <500 7,500 <br />54,000 5,100 25,000 <br />W-35SVE5 <br />08/31/11 — — — — 1,200d 3,200 — 14 790 <br />120 110 220 <br />W-35-AS6 <br />09/26/11 — — — — 9,500d 130,000 — <500 25,000 <br />44,000 2,400 15,000 — — <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 801513. Priorto 2002, analyzed using EPA Method 8015 (modified) <br />MTBE <br />= Methyl tertiary butyl ether analyzed using EPA Method 8260B. <br />BTEX <br />= Benzene, toluene, ethylbenzene, and total xylenes analyzed using EPA Method 826013; analyzed using EPA Method 80218 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 82608. <br />TBA <br />= Tertiary butyl alcohol analyzed using EPA Method 8260B. <br />EDB <br />= 1,2-dibromoethane analyzed using EPA Method 82608. <br />1,2 -DCA <br />= 1,2-dichloroethane analyzed using EPA Method 82608. <br />DIPE <br />= Di -isopropyl ether analyzed using EPA Method 82608. <br />Ethanol <br />= Ethanol analyzed using EPA Method 8260B. <br />Metals <br />= Metals analyzed using EPA Method 60108; prior to May 2011, analyzed using EPA Method 6020. <br />Ng/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 sample 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 />