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Quarterly Report - Fourth Quarter 2001 • Mel Bokides Petroleum Inc. 444 Mossdale Road, Lathrop, California ' 1.0. ` INTRODUCTION At the request of Mr Nick Bokides of Mel Bokides Petroleum Inc ,Advanced GeoEnvironmental, Inc (AGE)has prepared the enclosed report for the former Mel Bokides Petroleum facility located at 444 Mossdale Road, Lathrop, California(the site) The site setting is illustrated on Figure 1 Site ' structures, previous borings and monitoring well locations are depicted on Figure 2 The scope of work included monitoring of the ground water monitoring well network on the site The site history and a description of work previously performed at the site were presented in the AGE- prepared Preliminary Investigation and Evaluation Report (PIER), dated 01 March 2000 ' The field work was performed and this report prepared in accordance with Central Valley Regional Water Quality Control Board (CV-RWQCB) and San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)guidelines for subsurface investigations of underground ' storage tank (UST) sites and ground water monitoring well sampling procedures, respectively '. 2 0. PROCEDURES ' On 26 October 2001, ground water monitoring and sampling were performed at the site on wells MW-1 through MW-5 ' 2 1 WELL MONITORING, EVACUATION AND GROUND WATER SAMPLING I A Sohnst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-5 After depth to ground water measurements were taken, a minimum of 3 casing-water volumes were purged from each well to be sampled using dedicated,disposable bailers I Seven to eight gallons of water were removed from each well Temperature,pH and conductivity of purged ground water were measured at 1-gallon intervals using an ICM water analyzer` The field data sheets are included in Appendix A Purged water was temporarily stored on-site in 55-gallon DOT-approved H-17 storage drums pending proper disposal Following purging, the depth to ground water was measured to ensure that a minimum of 80% well-volume recharge had been achieved prior to sampling A water sample was collected from each well using the dedicated, disposable plastic bailer Immediately upon retrieval, samples were transferred into a one-liter amber bottle with no sample . preservative and into three 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative The samples were logged on a chain-of- I