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Geological Technics Inc. Page 4 Bank of Stockton-Western Lift Remedial Feasibility Study-Work Plan Project#358.3 September 28, 1995 will be continuously cored with a 1 1/2 inch diameter spoon. The samples 5 foot samples from VEW 2 will be collected by removing the bit and a sampler will be driven into the soil. Soil samples will be collected in 6.0 inch brass liners using a 2.0 inch modified California split spoon sampler. All soil samples for possible analysis will be sealed with aluminum foil, capped, labeled and placed in a cooler at 4 degrees Celsius for transport to the laboratory following Chain of Custody protocol. The continuously cored material from VEW-1 will also be photographed to make a ' record of the stratigraphy of the vadose zone soil. Because every soil sample collected will not be submitted for laboratory analysis, a screening process will be used to gather additional information through field observation noting sediment type, especially grain size and clay content; moisture ' content; visible evidence of contamination, i.e., color change due to reduction of iron or discoloration from hydrocarbons and other pollutants, and the readings above background on a organic vapor meter (OVM). The OVM is a field portable photo ' ionization detector that uses a 10.0 eV lamp to detect compounds with ionization potential below 10.0 eV (hydrocarbon range). 2.3 Groundwater Sampling Procedure The groundwater in the new wells VEW-1 and VEW-2, will be sampled after well ' development. The water sample will be collected in accordance with the attached protocol. In brief: Before sampling is attempted, the wells will be sounded for depth to water and then will be purged of at least 3 well volumes of water using either a suitable pump or bailer. Purging will continue until the temperature, conductivity, and pH of the groundwater have stabilized (<10% variation between three readings) indicating that formation water representative of aquifer conditions is entering the well. The sample will be collected in a suitable glass container, labeled, placed in an ice chest cooled to 4 degrees C for transport to the laboratory. A chain of custody document, listing all samples collected, will accompany the sample from field to laboratory, thereby providing a means to track movement and insure integrity. ' All water purged from the well and not used as a P ,sam lewill be laced in a 55 P gallon DOT approved container, properly labeled and stored on site.