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N..W Geo&guaI Techfcus Inc. Page 3 Monitoring Well Installation Work Plan Valley Wholesale Drug Co.,Inc. it Project No. 989.2 November 21,2001 After the well sealing materials have set (>24 hours), the well will be developed (using mechanical surging and pumping methods) until a clear stream of water is obtained. The well will be purged and groundwater samples collected no sooner than 24 hours after well �. development. All development and purge water will be containerized in 55-gallon DOT approved containers and stored on site until their disposition can be arranged. 2.3 Soil Sampling & Analysis Protocol W 2.3.1 Soil Sample Collection ,r Soil samples will be collected for geological and analytical evaluation at five-foot intervals. A professional geologist working under the supervision of a registered geologist will maintain a boring log providing sediment description using the USCS and field observations. Soil samples will be collected in 6.0-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 protocol. Because every soil sample collected will not be submitted for laboratory analysis, a screening process will be used to gather additional in£orination through field observations. These observations will 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 field portable photo ionization detector that uses a 10.0 eV lamp to detect compounds with ionization potential below 10.0 eV (hydrocarbon range). 2.3.2 Soil Sample Analyses Based on field screening observations, up to two soil samples from each borehole will be submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory 41400) for �. analysis for benzene, toluene, ethylbenzene and xylene (BTEX) by EPA method 8020, gasoline range petroleum hydrocarbons (TPH-Gas) by EPA method 5030/8015(m), Methyl Tertiary Butyl Ether (MTBE) by EPA method 8020 with confirmation by 8260, and Oxygenates (5), 1,2 DCA, EDB by EPA method 8260. The detection limits for these compounds are listed below. A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. Detection Limits: BTEX MTBE TP H-Gaso line xygenates , 1,2 DCA, EDB Soil µg g ,000 5 IP �,. TBA detection limit is 20(µg/Kg) 4 i.