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GeologicaC7'ecFinres Znc. Shawver WP Add_ Page 3 Project No. 757.2 July 28, 1999 USCS and field observations will be maintained I li st working under. the supervision of a registered geologist. Soildsamplesri villsbe collectedal ll �in 6.O inch brass liners using a 2.0 inch modified California split spoon sampler. All soil samples will be sealed with Teflon, capped with Teflon end caps, labeled :and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody.protoeoI. Since only selected soil samples will be submitted for laboratory analysis, a screening process will be used to gather additional information through field observation including: • sediment type, especially grain size and clay content i6 • moisture content 0 visible evidence of contamination, i.e., color chaa r'ge due to reduction of iron or discoloration from hydrocarbons and other pollutants readings above background on a organic vapor meter(OVM) The OVM is a portable photo ionization detector that l uses '!a 10.0 eV lamp to detect compounds with ionization potential below 10.0 eV (hydrocarbon range). SimulProbe Sam le Procedure �� a The SimulProbe allows a soil sample to be collected at the exact interval from which the water or soil gas sample is collected thus providing correlative information on the sorbed portion of the contaminated zone. Furthermore the SimulProbe's design reduces the possibility of cross contamination from shallower borehole`waters. After the SimulProbe groundwater sampling tool is advanced into the saturated zone, ahead of the drill bit, the tool is then retracted to expose the screen. The sample collection chamber is allowed to fill under ambient hydrostatic pressure. Once`.full, the chamber is sealed with a + pneumatically actuated (NZ gas) solenoid valve and the apparatus is brought to the surface. The sample chamber is carefully emptied using a bottom-emptying device thus reducing the possibility of sample agitation and volatilization. Once the` sample container (40 ml VOA or 1-liter bottle) is filled and capped, the bottle will be inverted, tapped, and checked for f headspace bubbles. The sample container is identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the 1 laboratory. '� Wero ose to collect two soil and soil-pore p p p water samples from below the water table in boring SB-101. Proposed sample depths are 80 and 100 feet bgs.'' 'M 2.3 Monitoring Well Construction k The monitoring well will be constructed using 2.0 inch inside l�diameter PVC casing with flush threads. Groundwater is expected to be located approximately 65 feet below grade. The well will be secured with a locking watertight cap encased in flush mounted traffic rated well box. The table below shows well construction. During installation of the filter pack, the well will be surged to assure maximum filter pack density. i Well o. aa. Screen Slot Sand PackTrans. Seal. rout Seal san ', -63' 61'-surface - -g san - -sur ace This construction may be changed slightly in the field due to geology or depth to water.