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1 ' 05 October 2007 AGE-NC Project No.07-1537 ' Page 4 of 8 ' 2.2.2. Logging Soil was extruded from a second stainless steel sleeve and then visually described in accordance with the Unified Soil Classification System; boring logs are provided in Appendix D. Soil was not screened for the presence of organic vapors,because the organic vapor meter(OVM)was inoperable. ' 2.2.3. Well Completions ' Pilot borings MW4 through MW6 were completed as single-level ground water monitoring wells utilizing 2-inch diameter schedule 40 polyvinylchloride (PVC) 0.020-inch slotted screen installed from approximately 30 to 50 feet bsg.A filter pack,consisting of 42/12 Lonestar sand,was installed ' from approximately 28 to 50 feet bsg. A nominal 2-foot bentonite seal (pell plug non-coated bentonite pellets)was installed above the filter pack and hydrated.The well was then grouted to near the surface with portland cement, and water-tight, traffic-rated well boxes were installed over the ' wells. The as -built well diagrams are depicted on the boring logs in Appendix D. i2.2.4. Well Head Survey ' On 10 July 2007, a California state-licensed surveying engineer from Baumbach & Piazza, Inc surveyed the location and elevation of monitoring wells MW-4 through MW-6; the global positioning system(GPS)location was surveyed to the nearest 0.1-foot relative to coordinate datum ' NAD 83(1986)and the elevation at the top of the well casings were surveyed to the nearest 0.01 foot relative to the City of Stockton Bench Mark# 182 at 15.77 feet above mean sea level (MSL). The elevations of wells MW-4, MW-5 and MW-7 were determined to be 16.67 feet MSL, 16.47 feet ' MSL, and 16.03 feet MSL, respectively. Geo-coordinantes (X, Y and Z) files, and GeoMap, were error-checked and uploaded to the State Water Board's Geotracker data base; the confirmation numbers are 4125948846, 7348513543, and 8164248406. 3.0. FINDINGS ' A discussion of field and laboratory results of soil and grab groundwater samples collected from CPT boring and pilot boring advancements are detailed below. 3.1. STRATIGRAPHY ' Generally,the soil type encountered in pilot borings MW4 through MW6 was a dark yellow- orange ' Advanced GcoEvironmental,Inc.