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ATTACHMENT 4 SOIL SAMPLING AND SAMPLE HANDLING PROCEDURES AND BORING PERMIT Soil Samples from Borings A track mounted limited access Geoprobe® was used to collect soil samples from borings. The Geoprobe is a hydraulically -powered soil probing machine that utilizes static force and percussion to advance small diameter sampling tools into the subsurface was used to collect soil samples. Upon reaching the desired depth, the bottom plug was released and driving action forced relatively undisturbed soil into the lined sampler barrel. Following the driving operation, the sampler was retrieved from the boring and the sample liner removed. A portion of the soil sample liner was selected and prepared for shipment to the analytical laboratory. The selected sample was sealed by covering the ends with a sheet of Teflon and placing plastic caps on each tube end. Each sample was labeled and placed in a refrigerated chest for shipment to a state -certified analytical laboratory. To avoid cross -contamination between samples and boreholes, the sampler was cleaned before each use. The sampling equipment was washed with an aqueous solution of Alconox, rinsed with potable water and then distilled water, and allowed to air dry. Push rods were washed between borings to reduce potential cross -contamination. A portion of each recovered soil sample was examined by a geologist. The geologist observed the soil and recorded the soil characteristics visually observed. The soil description was based on the Unified Soil Classification system. An individual description of each soil sample was recorded for use in the site characterization report. Soil Samples from Excavations During sampling, the hand auger was manually driven or screwed into the soil. When the bucket was full, the hand auger was lifted from the boring, and the contents emptied into a drum. When the required sample depth was reached, samples are collected by emptying the contents of the bucket into a sample container (4 oz glass jar). Each sample was labeled and placed in a refrigerated chest for shipment to a state -certified analytical laboratory. To avoid cross -contamination between samples, the sampling equipment was cleaned before each use. The equipment was washed with an aqueous solution of Alconox, rinsed with potable water and then distilled water, and allowed to air dry. 10213-1.1 t.rp1 GRI