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IleQuarterly Report - Fourth Quarter 2003 FORMER CONNELL MOTOR LIFT TRUCK- RIVER CITY PETROLEUM 2211 North Wilson Way, Stockton, California 1.0. INTRODUCTION ' At the request of Mr Sheldon Heckman and Ms Kama Harngfeid, Esq , Advanced GeoEnviromnental, Inc (AGE) has prepared this quarterly report for the property located at 2211 North Wilson Way, Stockton, California(the site) The scope of work included conducting a quarterly ground water monitoring event and preparation of this report The site setting is illustrated on Figure 1 Site structures, soil boring and monitoring well locations are depicted on Figure 2 I The objective of this investigation was to monitor the vertical and horizontal extent of dissolved petroleum hydrocarbons and fuel additives on the site A site conceptual model with minor background information is included in Appendix A The procedures for the site investigation were outlined in the AGE-prepared Additional Site Assessment Work Plan,dated 19 May2000,and approved by the California Regional Water Quality Control Board - Central Valley Region(RWQCB)by letter dated 13 November 2000 ' • 2.0. PROCEDURES On 29 and 30 December 2003, ground water monitoring and sampling were performed Field work Iwas performed in accordance with guidelines established by the RWQCB.for subsurface investigation of contaminated sites The number of the ground water monitoring wells has been reassigned,at the direction of the CVRWQCB, which is presented in Table I and Figure 2 2 1 WELL MONITORING AND PURGING The depth to ground water in each well was measured to the nearest 0 01 foot from the top of each well casing utilizing a Solmst water level meter The ground water elevation was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) After water levels were measured, dedicated disposable bailers were utilized to purge between 3 75 and 4 5 gallons of ground water (a minimum of three casing-water volumes per well) from the shallow wells related to the site MW-1 through MW-17 A set of dedicated Waterra inertial bailers were used to purge wells MW-2 to MW-8 and disposable bailers were used to purged and sample wells MW-1 and MW-9 to MW-17 An oily product was discovered in well MW-15 and this well was purged of the product and not sampled The ground water level in well MW-4 drew down during purging and only one-gallon was removed during the purged, prior to sampling Advanced GeoEnvironmentat,Inc