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Work Plan-Soil and Groundwater Investigation CSUS—Multi-Campus Regional Center r June 21,2000 1 Page-4- ` L Each soil sample will be cut from the liner at the selected depth-.for potential laboratory analyses. The soil samples will be retained, undisturbed, in the liners. The liners will be sealed at the ends with Teflon® sheeting, capped, wrapped with duct tape, and labeled. The samples will be stored in a-cooler chilled with ice and delivered under chain-of-custody procedures to Exelchem Environmental Labs of Roseville, California. The samples will be analyzed using U.S. EPA Methods and California-approved methods under quality assurance measures. m 3.4 GROUNDWATER SAMPLING If groundwater is encountered in the borings, one groundwater sample will be collected from each boring with the Geoprobe groundwater sampler. The sampler utilizes a sealed, water-tight, stainless steel sample chamber and PVC.screen which is isolated from the surrounding environment as the sampler is advanced. When the desired depth for collection of a groundwater sample is reached, the sample chamber is opened by pulling back on the body of the sampler and exposing the screen. When the screen P P g is full, a small diameter Teflon® bailer is lowered into the push rod and a groundwater sample is retrieved from the sample chamber. The groundwater will be gently emptied from the bailer with a bottom-emptying -device into the appropriate laboratory supplied containers. The sample containers will be sealed, labeled, and placed in a cooler chilled with ice for delivery under chain-of-custody procedures to Exelchem Environmental rLaboratories, Inc. of Roseville, California, for analyses. 3.5 LABORATORY ANALYSES The soil and groundwater samples collected from the borings will be analyzed for Methyl tertiary-Butyl Ether (MTBE), and benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 8020: The soil and groundwater samples will also be analyzed for total petroleum hydrocarbons quantified as kerosene, diesel and motor oil by EPA Method 8015m. In addition, the groundwater sample collected from the boring proposed to be installed in the approximate center of the former-location of TK 10 will be analyzed for gasoline oxygenates/additives by EPA Method 8260B and for total lead by EPA Method 7420. The gasoline oxygenates/additives include Methyl tertiary-Butyl Ether(MTBE), Ethanol, tertiary- Butanol, Di-isopropyl ether (DIPE), Ethyl tertiary-Butyl Ether- (ETBE), tertiary-amyl Methyl Ether (TAME), 1,2-Dichloroethane (1,2-DCA); and Ethylene Dibromide (EDB): If MTBE is detected in n• LJ CONDOR