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( y antea'group photoionization detector(PID) calibrated to 100 parts per million by volume of isobutylene. Antea Group will collect soil samples selected for laboratory analysis in methanol-preserved volatile organic analysis (VOA) soil sampling kits in accordance with United States Environmental Protection Agency (EPA) Method 5035. Each sample will be sealed, labeled in accordance with laboratory-specified sampling procedures, and submitted under chain-of-custody protocol to a State of California approved laboratory for the following analyses: • Gasoline range organics (GRO) by EPA Method 8015M; • Diesel range organics(DRO) by EPA Method 8015M; • Benzene, toluene, ethylbenzene, total xylenes(BTEX), dibromoethane (EDB), 1,2-dichloroethance(1,2- DCA), naphthalene, methyl tertiary butyl ether(MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether(TAME), and ethanol by EPA Method 8260B. SECTION 4.2.2: WELL SURVEYING Upon completion, the monitoring wells will be surveyed by a licensed surveyor for elevation, latitude, and longitude. Antea Group will upload the survey data to GeoTracker as required. SECTION 4.2.3: WELL DEVELOPMENT A minimum of 72 hours following installation, the monitoring wells will be developed using a surge block, bailer, and submersible pump. During well development,water will be removed until it becomes visually clear and field parameters, such as temperature, specific conductivity, pH, dissolved oxygen, oxidation reduction potential, and turbidity have stabilized within 10 percent. SECTION 4.2.4: GROUNDWATER SAMPLING Following well development, Antea Group will gauge, purge, and sample wells MW-1 through MW-5. Antea Group will submit the groundwater samples under chain-of-custody protocol,to a State of California approved laboratory for the following analyses: • GRO by EPA Method 801513; • DRO by EPA Method 80158; • BTEX, EDB, 1,2-DCA, naphthalene, MTBE,TBA, DIPE, ETBE,TAME, and ethanol by EPA Method 8260B. SECTION 4.3: WASTE DISPOSAL Waste generated during drilling and sampling activities will be contained in labeled, Department of Transportation (DOT)-approved 55-gallon drums.The drums will be temporarily stored on-site pending laboratory results for waste characterization. Once the waste has been profiled, a qualified contractor will transport and dispose of the drummed waste at approved disposal facilities. SECTION 5.0: SCHEDULE AND REPORTING Antea Group will begin field activities upon approval of this work plan. Once field work is complete,Antea Group will prepare a summary report of the investigation that will be submitted to the CVRWQCB within approximately 45 days after receipt of the final analytical data. xl NOGEN• 3 us.anteagroup.com