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Geological Technics Inc • Page 5 <br /> George's Service <br />' Additional Site Charactenzahon Work Plan <br /> . Project No 2812 <br /> January 29,1996 <br /> I <br />' A chain of custody document, listing all samples collected, accompanies the samples <br /> from field to laboratory, thereby providing a means to track their movement and <br /> insure their integrity <br />' All water purged from each monitoring well and not used as a sample, will be <br /> placed in a 55 gallon DOT approved container, properly labeled and stored on site <br /> 2.4 Soil Sampling Procedure <br /> Soil samples will be collected for geological and analytical evaluation at five foot <br /> intervals A boring log providing sediment description using the U S C S and field <br /> observations will be maintained by a professional geologist working under the <br /> supervision of a registered geologist Soil samples will be collected to 6 0 inch brass <br /> liners using a 2 0 inch modified California split spoon sampler All soil samples will <br /> be sealed with aluminum foil, capped, labeled and placed in a cooler at 4° Celsius for <br /> transport to the laboratory following Cham of Custody protocol <br /> M Because every soil sample collected will not be submitted for laboratory analysis, a <br /> screening process will be used to gather additional information through field <br /> observation noting sediment type, especially gram size and clay content, moisture <br /> 1 content, visible evidence of contamination, 1 e , color change due to reduction of iron <br /> or discoloration from hydrocarbons and other pollutants, and the readings above <br /> background on a organic vapor meter (OVM) The OVM is a field portable photo <br /> I ionization detector that uses a 10 0 eV lamp to detect compounds with ionization <br /> potential below 10 0 eV (hydrocarbon range) <br />' 2.5 Soil and Water Analyses <br /> Based on field screening observations one soil sample from the capillary fringe from <br /> t each boring will be submitted to Sherwood Labs of Hilmar (DHS Certified <br /> Laboratory 1400) and analyzed for benzene, toluene, ethylbenzene and xylene (BTEX <br /> by EPA method 8020), gasoline range petroleum hydrocarbons analyses (TPH- <br />' Gasoline by EPA method 5030/8015m) and diesel range petroleum hydrocarbons <br /> analyses (TPH-Diesel by EPA method 3540/8015m) The detection limits for these <br /> compounds are listed below A Cham of Custody will be completed for all samples <br />' collected and tracked to ensure sample integrity <br />' Detection Limits BTEX TPH-Gasoline TPH-Diesel <br /> Water 41 /L) 03 50 50 <br /> Soil (µ /K ) 30 1,000 1,000 <br /> 1 <br /> r <br />