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'"Fol Additional Groundwater Investigation and Reme'Zleon Feasibility Evaluation Work Plan Stockton Center Site Authority-University Park January 25,2005 Page 9 from each monitoring well. The purged water from each well will be placed in 55-gallon drums, sealed, labeled, and left on-site pending results of laboratory analyses. Each well will be allowed to recover to at least 80% of its pre-purge water level before sampling. However, if any of the monitoring wells do not recover to at least 80% of its pre-purge water level by the end of the field day, the monitoring well will be sampled at that time and the percent recovery noted.The groundwater samples will be collected with clean, disposable bailers. Each water sample will be gently drained from the bailer with a bottom emptying device into the appropriate laboratory supplied containers. The sample containers will be sealed, labeled, placed in a cooler with ice and delivered under chain-of-custody procedures to a California-certified laboratory for analyses. 5.7 LABORATORY ANALYSES The soil samples collected from the borings and groundwater samples collected from the monitoring wells will be analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-G) and total extractable petroleum hydrocarbons (TEPH) quantified as kerosene, diesel, and motor oil by EPA Method 8015M; for benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 826013; and for gasoline oxygenates/additives by EPA Method 826013. The gasoline oxygenates/additives include Methyl tertiary- Butyl Ether (MTBE), ethanol, tertiary-Butanol (TBA), Di-isopropyl Ether (DIPE), Ethyl tertiary-Butyl Ether(ETBE), ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), and tertiary-amyl Methyl Ether (TAME). The samples will be delivered under chain-of-custody procedures to a California-certified laboratory for analysis.The analytical methods and analytical detection limits are presented in Table 1. TABLE 1 Laboratorl Analytical Methods CONSTITUENT METHOD DETECTION LIMIT Soil BTEX 80260 5.0 pg/kg TPH-G 8015M 1.0 mg/kg TEPH 8015M 1.0 mg/kg(D)5.0 mg/kg(K) 10.0 mg/kg(MO) Gasoline Additives/Oxygenates 8260 5 gg/kg- 100 pg/kg Groundwater BTEX 8020 0.5 µg/L TPH-G 8015M 50µg/L TEPH 8015M 5.0µg/l_(K,D)50.0µg/L(MO) Gasoline Additives/Oxygenates 8260 1.0µg/L-50.0µg/L Notes: D=diesel lug/L=micrograms per liter=parts per billion(ppb) K=kerosene µg/kg=micrograms per kilogram=parts per billion(ppb) MO=motor oil mg/kg=milligrams per kilogram=parts per million(ppm) Additional testing and analyses of select soil samples and native site groundwater may offer insight into specific site subsurface conditions and potential remediation methods and are summarized below in the next section.