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Geologicalredwcsinc. • • Page ' Work Plan George's Service Project No.425.2 August 14,2002 California split spoon sampler. All soil samples will be sealed with Teflon, capped with end caps, labeled and placed in a chilled cooler for transport to the laboratory following Chain of Custody protocol. Since only selected soil samples collected will be submitted for laboratory analysis, a screening process will be used to gather additional information through field observation. These observation include: • 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 • readings above background on a organic vapor meter (OVM) The OVM is a portable photo ionization detector that uses a 10.0 eV lamp to detect compounds with ionization potential below 10.0 eV(hydrocarbon range). 2.1.2 Soil Laboratory Analyses ' Up to five soil samples from borehole MW-201 and three soil samples from borehole MW- 106 will be submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory #1400) for the following analysis: ' • BTEX by EPA method 8020 • MTBE by EPA method 8020 • TPH-G by EPA method 8015(m) • One sample from each boring will be tested for the oxygenate compounds (MTBE, TBA, DIPE, ETBE and TAME)by EPA method 8260 ' 2.1.3 Monitoring Well Construction 30-Foot Wells The monitoring wells will be constructed using 2.0-inch diameter PVC casing with flush threads. A short screen(2.5-feet in length) will be used. A#3 sand filter pack will surround and extend two feet above the 0.020 inch screened interval. A weighted bentonite pellet seal will be installed. A surface seal of neat cement grout (augmented with<4%bentonite) will be installed via a tremie pipe. The wells will be secured with locking watertight caps encased in flush mounted traffic rated well boxes. Construction details are as follows: We o. ta. creen of an ac rans. ea rout ea - san -s ace - san -su ace This is the same construction as MW-105. Figure 3 is a schematic of monitoring well construction.