FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Site Characterization-Second Event Page 3 Former Karlson Trucking Facility Project No. 191.2 March 2,2001 2.3 Groundwater Sampling Prior to completing the Geo-Probe borings to the desired depth, groundwater samples were collected from three levels in each of the borings. Rubber O-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 un-preserved, 1-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. 2.4 Field Data and Geology A detailed log was made of each boring. The information noted included such data as sample depths, horizons of detectable contamination (detected by field methods), soil description (color, texture, composition, hardness, moisture content, and post- depositional changes that have occurred in the sediments) and symbols utilizing the Unified Soil Classification System. The soils at the site generally consist of clean, medium- to very coarse-grained sands. In contrast with prior sampling events, no trace of hydrocarbon odors were noted. No field evidence (including odor or stain) was observed to suggest that any of the soil or groundwater encountered in these boring had been impacted with petroleum hydrocarbons. The boring logs for borings SB-13 and SB-14 are attached as Appendix C. 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto,Ca 95356 Fax: (209)569-0295