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1 S <br /> Additional Groundwater Investigation and Remediation Feasibility Evaluation Work Plan <br /> Stockton Center Site Authority_University Park <br /> January 25,2005 <br /> Page 9 <br /> i from each monitoring well. The purged water from each well will be placed in 55-gallon drums, sealed, <br /> labeled,and left on-site pending results of laboratory analyses. <br /> ` Each well will be allowed to recover to-at least 80% of its .re- ur e water level before sampling. <br /> p p g p g <br /> However, if any of the monitoring wells do not recover to at least 80% of its pre-purge water level by the <br /> end of the field day, the monitoring well will be sampled at that time and the percent recovery noted. The <br /> groundwater samples will be collected with clean, disposable bailers. Each water sample will be gently <br /> k drained from the bailer with a bottom emptying device into the appropriate laboratory supplied <br /> containers. The sample containers will be sealed, labeled, placed in a cooler with ice and delivered under <br /> chain-of-custody procedures to a California-certified laboratory for analyses. <br /> 5.7 LABORATORY ANALYSES <br /> The soil samples collected from the borings and groundwater samples collected from the monitoring wells <br /> will be analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-G) and total extractable <br /> L <br /> petroleum hydrocarbons (TEPH) quantified as kerosene, diesel, and motor oil by EPA Method 8015M; <br /> for benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 826013; and for gasoline <br /> oxygenates/additives by EPA Method 8260B. The gasoline oxygenates/additives include Methyl tertiary- <br /> ' Butyl Ether (MTBE), ethanol, tertiary-Butanol (TBA), Di-isopropyl Ether (DIPE), Ethyl tertiary-Butyl <br /> Ether(ETBE), ethylene dibromide (EDB),'1,2-dichloroethane (1,2-DCA), and tertiary-amyl Methyl Ether <br /> is (TAME). The samples will be delivered under chain-of-custody procedures to a California-certified <br /> ' M laboratory for analysis.The analytical methods and analytical detection limits are presented in Table 1. <br /> TABLE 1 <br /> Laboratory Analytical Methods <br /> LQ CONSTITUENT METHOD DETECTION LIMIT <br /> Soil <br /> 4 BTEX 80260- 5.0µg/kg <br /> TPH-G 8015M 1.6 mg/kg <br /> TEPH 8015M 1.0 mg/kg(D)5.0 mg/kg(K) 1Q.0 mg7kg(MO) <br /> Gasoline Additives/oxygenates 8260 5 pg/kg- 100µg/kg. <br /> Groundwater <br /> f BTEX 8020 0.5µg/L <br /> TPH-G 8015M 501tg/L <br /> TEPH 8015M 5.0µg/L(K,D)50.0µ MO <br /> Gasoline Additives/Oxygenates 8260 1.0 pg/L-50.0 pg/L <br /> Notes: <br /> ! D=diesel µg/L=micrograms per liter=parts per billion(ppb) <br /> K=kerosene pg/kg=micrograms per kilogram=parts per billion(ppb) <br /> ` MO=motor oil mg/kg=milligrams per kilogram=parts per million(ppm) <br /> Additional testing and analyses of select soil samples and native site.groundwater may offer insight into <br /> specific site subsurface conditions and potential remediation methods and are summarized below in the <br /> next section. <br /> t � <br /> �a CONDOR <br />