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sl j . • <br /> Ripona Market <br /> Subsurface Soil & Groundwater Investigation II <br /> Page: 5 <br /> The samples will be refrigerated immediately for delivery to the laboratory and <br /> will under no circumstances be opened by anyone other than laboratory personnel <br /> Chain of Custody records will be maintained at all times <br /> 2.4 Soil Sampling <br /> All soil sampling equipment will be thoroughly steam-cleaned before and <br /> between sampling to prevent cross contamination Relatively undisturbed soil <br /> samples will be taken at intervals of not more than 5 feet in order to evaluate the <br /> subsurface materials, however, this sampling interval may be waived in saturated <br /> sands in which sample recovery is not possible <br /> Soil samples will be taken using a California Modified Split Spoon sampler with <br /> brass liners The sampler will be driven by a 140 pound hammer repeatedly <br /> falling 30 inches The blow counts necessary to drive the sampler will be <br /> recorded for each 6-inch interval to help evaluate the consistencies of the <br /> materials <br /> The laboratory samples will not have head space and will be immediately sealed <br /> in their liners using aluminum foil lined plastic caps The remaining sample will <br /> be removed from its liner to be used as an aide to the on-site geologist in logging <br /> the material at that depth Soil samples collected for analysis will be analyzed <br /> using EPA method 5030 modified for total petroleum hydrocarbons in the <br /> gasoline range and EPA method 8021B for BTX&E and MTBE compounds <br /> Method 8260 will be used to confirm the highest MTBE in each boring The <br /> minimum detection limits used for each analyte will be 005 mg/kg for BTX&E, <br /> and 1 0 mg/Kg for gasoline Analyses are to be conducted by GeoAnalytical <br /> Laboratories, Inc , in Modesto, California <br /> 25 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 should be listed on the Chain of Custody but will be analyzed <br /> only if all samples contain the same contaminants <br /> All sampling equipment including the pump, bailer, and cables, used by sampling <br /> personnel, will be disassembled, if appropriate, and steam-cleaned prior to <br /> commencement of sampling These procedures will also be followed between <br /> each well, sampling point and at the end of the sampling day De-ionized or <br /> organic-free water (also provided by the laboratory) will then be introduced into <br /> the pump or bailer as a final stage of cleaning This water will then be pumped or <br /> gently poured into sample vials to be used as pump or bailer blanks These blanks <br /> will be tested only if their corresponding samples are found to contain <br /> contaminants <br />