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' Former Nelson Ready Mix Page 4 <br /> Groundwater Monitoring Well Construction <br />' GPE Protect No 5]8 2 <br /> March 30, 2006 <br />' 2.0 FIELD INVESTIGATION <br /> The following sub-sections describe the work completed on and near the subject <br />' site <br /> 2.1 Soil Borings & Monitoring Well Construction <br /> Three groundwater monitoring wells (designated as MW-1 through MW-3) were <br /> drilled and constructed <br /> 2.1.1 Soil Boring Drilling <br /> On February 10, 2006 a BK-81 hollow stem auger drilling rig, owned and <br />' operated by V&W Drilling Inc (C-57 #720904), was used to drill three soil <br /> borings (designated as MW-1, MW-2, and MW-3) The borings were advanced to <br /> a total depth pf 20 feet While drilling, all soil cuttings were placed in <br /> 1 previously existing stockpile for bio-remediation <br /> The borings were drilled using 8-inch diameter hollow stem auger tools Soil <br /> samples were collected during the drilling process to assist in logging the <br /> borings, and for possible laboratory analysis <br />� . <br /> 2.12 Soil Sample Collection Procedures <br /> During the drilling process, soil samples were collected for geological and <br /> possible analytical evaluation at five-foot intervals using a 2 0-inch diameter <br /> (i d ) California split spoon sampler with the samples contained in 2 by 6-inch <br /> stainless steel liners The sampler was driven up to 18 inches into the native <br /> soil using the 140-pound slide hammer mounted on the drill rig The hammer <br /> blow count was recorded for each sample collected All soil samples were sealed <br /> with aluminum foil, capped, labeled and placed in a cooler at 4° Celsius for <br /> transport to the laboratory following Chain of Custody protocol <br /> Boring logs of soils encountered in each boring were kept by a professional <br /> geologist working under the supervision of a California Professional Geologist <br /> (Appendix B) Recorded in these logs were notes on sampling intervals, boring <br /> locations and sediments intersected by the boring Not all soil samples collected <br /> were submitted for laboratory analysis Accordingly, a field screening procedure <br /> was used to select those samples that were to be tested Special attention was <br /> paid to sediment type, color, grain size, sorting, and odor <br /> 2 13 Monitoring Well Construction <br /> After drilling, the borings were converted to monitoring wells They were <br /> constructed as originally proposed in the Work Plan The wells were cased with <br /> 2 0-inch diameter, schedule 40 PVC casing with flush threaded points The <br /> 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 <br /> Modesto, CA 95356 Fax (209) 569-0293 <br />