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TABLE 2 <br />Historical Groundwater Monitoring & Analytical Data <br />Stockton Charter Way Commingled Plume <br />440, 441, and 508 West Charter Way, 1426, and 1444 South Lincoln Street, Stockton, CA <br />Notes: <br />TPHg = Total petroleum hydrocarbons as gasoline <br />TPHd = Total petroleum hydrocarbons as diesel <br />B = Benzene <br />T = Toluene <br />E = Ethylbenzene <br />X = Total xylenes <br />MTBE = Methyl tert-butyl ether <br />TBA = Tert-butyl alcohol <br />DIPE = Di -isopropyl ether <br />ETBE = Ethyl tert-butyl ether <br />TAME = Tert-amyl methyl ether <br />1,2 -DCA = 1,2 Dichloroethane <br />EDB = 1,2 Dibromoethane <br />McOH = Methanol <br />D.O. = Dissolved Oxygen <br />SPH = Separate phase hydrocarbons <br />TOC = Top of casing (surveyed) <br />Calc. GW Elev. = Calculated groundwater elevation = TOC - Depth to Water + 0.75`(Measured SPH Thickness); assuming a specific gravity of 0.75 for SPH <br />mg/L = Milligrams per liter <br />pg/L = Micrograms per liter <br />< = Analyte was not detected above the specified method reporting limit. <br />- = Not measured or analyzed <br />Refer to the reports in which data was first presented for more information on historical data. <br />(##) = Discrete sample depth in feet bgs <br />A = TX wells were collected as split samples from Blaine Tech via disposable bailer. <br />B = TX wells were collected as split samples afterwards via Waterra system. <br />BL = The same analyte is found in the associated blank. <br />BTEX, MTBE and oxygenates analyzed by EPA Method 8260B <br />DEST = Well destroyed; no sampling performed <br />DRY = Well dry during gauging; not sampled <br />DUP = Duplicate sample <br />G = Grab sample taken as part of Soil Vapor Extraction System monitoring <br />INA = Well Inaccessible <br />J = Estimated value (less than the method reporting limit and greater than or equal to the method detection limit) <br />N = Identity of contaminant uncertain (hydrocarbon pattern atypical of indicated analyte); see lab report <br />NS = Well not sampled <br />NSP = Well not sampled this event, in accordance with groundwater sampling schedule <br />R = Data rejected (data determined to be unreliable by laboratory); well resampled to obtain valid result <br />stockton_charter_way_comingles_plume_4g22.xlsm Page 115 of 116 Stantec <br />