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ori Quarterly Report - Fourth Quarter 2005 RIVER CITY PETROLEUM - CONNELL MOTOR LIFT TRUCK 2211 North Wilson Way, Stockton, California 1,0. INTRODUCTION At the request of Ms Kerry Heckman of Connell Motor LIR Truck,Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 2211 North Wilson Way, Stockton,California(the site) The site setting is Illustrated on Figure 1 Site structures,soil borings, and monitoring well and soil-vapor extraction well locations are shown on Figure 2 The scope of work included the following 1) operation and monthly monitoring of the Interim soil-vapor extraction (SVE) remediation system 2) performance of a quarterly ground water monitoring event In December 2005, and 3) preparation of this report The procedures for site remediation were outlined in the AGE-prepared Soil-Vapor Extraction and Site Assessment Work Plan,dated 15 November 2003 and approved by the Central Valley Regional Water Quality Control Board(CVRWQCB)In a letter dated 30 December 2003 Ground water monitoring was performed in accordance with procedures outlined In the AGE-prepared Monitoring Well Installation Work Plan, dated 01 June 2004, Monitoring Well Installation - Site Assessment Work Plan Addendum, dated 05 May 2005, and Monitoring Well Installation Location and Specification, dated 02 June 2005 and approved by the CVRWQCB by electronic letter dated 14 June 2005 and the MRP R5- 2005-0827 Currently,there are forty-eight monitoring well locations at the site Eighteen wells(MW-1 through MW-17 and MW-41) are shallow-water wells screened from 40 feet to 60 feet below surface grade (bsg),the remaining wells are either Intermediate or deep, depth-discrete ground water monitoring wells Based on field and laboratory analytical data, the screened intervals of these wells were set within eight depth-discrete Intervals (hydrogeologic units, HUs) to monitor vertical and lateral changes in hydraulic gradient,contaminant concentrations,and migration directions within each umt Each hydrogeologic unit was previously defined based on lithologic information provided by laboratory analyses, soil sample descriptions,and cone penetrometer testing The above-referenced monitoring wells are located within the hydrogeologic units as follows • Shallow-screened (40 feet to 60 feet bsg) monitoring wells MW-1 through MW-17 are screened through the first hydrogeologic unit (HU1), i • Upper intermediate-screened (75 feet to 85 feet bsg) wells MW-18 through MW-21 are screened in the second hydrogeologic unit (HU2), • Lower intermediate-screened (90 feet to 105 feet bsg) wells MW-22 through MW-29, MW-38, MW-40, MW-43, MW-45, and MW-47 are screened in the third and fourth hydrogeologic units (HU3 and HU4, respectively), • Deep-screened(125 feet to 135 feet bsg)wells MW-31 through MW-33 are screened In the • fifth hydrogeologic unit (HU5), Advanced GeoEnvironmental,Inc