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L.. Report-Soil Investigation <br /> Page 3 <br /> Former LTPRR Service Yard <br /> Project No. 376.2 <br /> 1.0 May 9, 2003 <br /> 2.0 FIELD DATA COLLECTION PROCEDURES <br /> La <br /> 2.1 Geo-Probe Soil Borings <br /> On April 22, 2003 three Geo-Probe soil borings (designated B-1, B-2, & B-3) were <br /> L- completed at locations shown on the site map and under the supervision of Mr. <br /> Harlin Knoll of the San Joaquin County Environmental Health Department. <br /> Boring B-1 was advanced at a point about 2 feet south of the pit of a former <br /> '- underground storage tank to a total depth of 45 feet below grade. The borings B- <br /> 2 and B-3 were located in the south and central parts of the former rail spur <br /> area on the east side of the Property, and were advanced to a total depth of 20 <br /> feet below grade. All three borings were drilled using a 1.5-inch o.d. Geo-probe <br /> equipment owned and operated by V & W Drilling Inc., of Rio Vista, CA (License <br /> #720904). Soil samples were collected for geological and possible analytical <br /> evaluation at five-foot intervals. In addition, upon reaching total depth a <br /> groundwater sample was collected from boring SB-1. Upon reaching total depth <br /> in each boring and collecting the final sample, each boring was filled to grade <br /> with neat cement. <br /> The Geo-Probe is a truck mounted drilling system that uses direct push <br /> methodology to collect soil and groundwater samples. Four foot long by 1.5-inch <br /> diameter stainless steel rods are pushed or hammered into the ground using a <br /> La hydraulic ram or the hydraulically actuated hammer mounted on the ram. Soil <br /> samples are collected using a 1.5-foot long by 1.5 inch inside diameter drive <br /> sampler lined with a plastic sample sleeve. This device is activated by removing <br /> a retaining bolt from the top of the device by inserting rods through the hollow <br /> stem of the probe rods. Removing this retaining bolt allows the drive point to <br /> retract through the sampling tube and a sample to be collected. <br /> 2.2 Geo-Probe Soil and Groundwater Sampling <br /> 2.2.1 Geo-Probe Soil Sampling <br /> Upon retrieval of each soil sample, the end of each plastic sample tube removed <br /> �. from the coring device and possibly submitted for laboratory analysis was sealed <br /> with Teflon sheets, capped with plastic end caps, secured with tape, labeled and <br /> placed in a cooler at 4° Celsius for transport to the laboratory using Chain of <br /> La Custody protocol. Chain of Custody (CofQ forms are documents used to track <br /> the handling of samples. All dates, times, persons and companies handling the <br /> samples were listed from the time the sample was collected to its ultimate <br /> disposal. <br /> Nitrile gloves were worn during sample collection and changed between the <br /> collection of each sample. <br /> .. 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br />