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Larkspur Estates Soil &Groundwater Sampling 2.2 Soil Sampling All soil sampling equipment will be thoroughly steam cleaned before and between sampling to prevent cross contamination. Relatively undisturbed soil samples will be taken at intervals of not more than five feet (5') in order to evaluate the subsurface materials. The soil samples will be taken using a Geoprobe® core sampler with plastic liners. The sampler will be pushed (Direct Push Technology) continuously by the hydraulically powered, percussion system. The laboratory samples will not have headspace and will immediately be sealed in their liners using plastic caps. The remaining sample will be removed from its liner to be used as an aide to the on-site geologist in logging the material at that depth. Soil samples will be collected at five foot intervals for screening and laboratory analysis (I laboratory soil sample per boring). All soil samples will be delivered, under chain of custody, to an analytical laboratory licensed by the State of California for hazardous materials work. The samples shall be analyzed for Total Extractable Petroleum Hydrocarbons by 5030 and 3550 Luft, BTX&E (Benzene, Toluene, Xylene, and Ethyl Benzene) and Oil & Grease. The minimum detection limits used for each analyte will be .005 mg/kg for BTX&E, and 1.0 mg/Kg for oil. The normal detection limits for Oil & Grease will be 50 mg/Kg for soil samples. Analyses are to be conducted by GeoAnalytical Laboratories, Inc., in Modesto, California. All rinse water will be removed by the driller, V&W Drilling, Inc. Drill cuttings are not produced by this method. 2.3 Groundwater Sampling A travel blank, provided by the laboratory, will accompany the sample vials from the time they are picked up from the lab to the time they are delivered to the lab. This travel blank will be listed on the Chain of Custody, but will be analyzed only if all samples contained the same contaminants. All sampling equipment, including the stainless steel Geoprobe® screen point, used by sampling personnel, will be disassembled and steam cleaned prior to commencement of sampling. These procedures will also be followed between each boring. The groundwater samples will be analyzed or extracted within 14 days according to their EPA methods. The samples shall be analyzed for Total Petroleum Hydrocarbons (gasoline), BTX&E (Benzene, Toluene, Xylene, and Ethyl Benzene) and the Oxygenated compounds by EPA Method 8260. Analysis will be conducted by GeoAnalytical Laboratories. The minimum detection limits used for each analyte 3