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Ripona Market <br /> 0 is <br /> Subsurface Soil & Groundviater Investigation III <br /> Page. 5 <br /> All borings will be drilled in such a manner as to prevent cross contamination <br /> between strata Water samples will be taken at the soil/groundwater interface (if <br /> encountered), and the borings will then be terminated with a cement and three <br /> percent (3%) Bentonite mixture <br /> 2.2 Soil Sampling <br /> All soil sampling equipment will be thoroughly steam cleaned before and between <br /> sampling to prevent cross contamination Relatively undisturbed soil samples will <br /> be taken at intervals of not more than five feet (5') in order to evaluate the <br /> subsurface materials <br /> The soil samples will be taken using a Geoprobe' core sampler with plastic liners <br /> The sampler will be pushed (Direct Push Technology) continuously by the <br /> hydraulically powered, percussion system <br /> The laboratory samples will not have headspace and will immediately be sealed in <br /> their liners using plastic caps The remaining sample will be removed from its liner <br /> to be used as an aide to the on-site geologist in logging the material at that depth <br /> Soil samples will be collected at five foot intervals for geological interpretation and <br /> laboratory analysis (2 laboratory soil samples per boring) All soil samples will be <br /> delivered, under chain of custody, to an analytical laboratory licensed by the State <br /> of California for hazardous materials work The samples shall be analyzed for Total <br /> Petroleum Hydrocarbons (gasoline), BTX&E (Benzene, Toluene, Xylene, and Ethyl <br /> Benzene), and MTBE by method 8021B The soil sample with the highest <br /> concentration of MTBE will be confirmed by Method 8260 for each boring The <br /> minimum detection limits used for each analyte will be 005 mg/kg for BTX&E, <br /> 0 01 mg/Kg for the Oxygenated compounds (0 1 mg/Kg for tertiary-Butanol), and <br /> 1 0 mg/Kg for gasoline Analyses are to be conducted by GeoAnalytical <br /> Laboratories, Inc , in Modesto, California <br /> 2.3 Groundwater Sampling <br /> A travel blank, provided by the laboratory, will accompany the sample vials from <br /> the time they are picked up from the lab to the time they are delivered to the lab <br /> This travel blank will be listed on the Chain of Custody, but will be analyzed only if <br /> all samples contained the same contaminants <br /> All sampling equipment, including the stainless steel Geoprobe' screen point, used <br /> by sampling personnel, will be disassembled and steam cleaned prior to <br /> commencement of sampling These procedures will also be followed between each <br /> boring <br />