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Site Characterization - Second Event Page 8 Former Karlson Trucking Facility Project No. 191.2 April 27, 2000 Geo-Probe Soil Boring Prior to completing the Geo-Probe borings to the desired depth, rubber 0- rings were installed above the threads of each joint of Geo-Probe stem. By doing this, groundwater above the sampling device was kept out of the hollow rods. The rods were then hammered to the desired depth and the rods retracted to expose a 3 foot section of well screen inside of the hollow sampling tip to the formation. Groundwater samples from the Geo-Probe borings were then collected by oscillating a clean dedicated section of Teflon tubing fitted with a check valve which was inserted inside of the hollow stem of the Geo-Probe. Samples were collected in 1 unpreserved liter amber glass bottles. Each sample container was then labeled and placed into an ice chest chilled to 4°C to await transport to the laboratory under chain of custody protocol. Monitoring Well The monitoring well sampling event was completed on March 29, 2000. Upon arriving on-site all the wells were opened and the depth to water measured 'M using an electrically actuated sounding tape. The water level reading was recorded to an accuracy of 0.01 foot. Each well was also screened for the presence of floating product. Floating product was not noted in any of the wells. Stagnant water in the well casing was purged using a dedicated submersible pump. The rate of well purging was noted and groundwater parameters measured, i.e., temperature, conductivity and pH, at the initiation of pumping and after purging each well volume to determine if water representative of formation was entering the well. It was assumed that representative water was entering the well when measured groundwater parameters were within 10% of each other for three consecutive parameter measurements. At a minimum, three well volumes were pumped from each well. Before a sample was collected, each well's water level was allowed to recharge to at least 80% of it's initial level. All water removed from the monitoring well and not used as a sample was placed in 55 gallon polyurethane drums, properly labeled, and temporally stored in a locked area on the site, pending arrangements for its proper disposal. 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, Ca 95356 Fax: (209)569-0295