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1 ' Quarterly Report - First Quarter 2005 i Former MEL BOKIDES PETROLEUM-MANTECA ' 983 Moffat Boulevard,Manteca, California ' 1.0. INTRODUCTION At the request of Mr Nick Bokides of Mel Bokides Petroleum,Advanced GeoEnvironmental, Inc ' (AGE)has prepared this quarterly report for 983 Moffat Boulevard, Manteca, California(the site) The location of the site and the surrounding area are illustrated on Figure 1, structures, former underground storage tank (UST) locations, and soil boring and monitoring well locations are illustrated on Figure 2 Ground water monitoring is being conducted at the site as required by the Central Valley Regional lac Water Quality Control Board (CW2%?5, ) This report presents the results of ground water monitoring activities conducted in and has been prepared in accordance with guidelines ' issued by the Regional Water Quality Control Board (RWQCB) Tri-Regional Board Staff Recommendations for Preliminary Investigations and Eval uation of Underground Tank Sites, dated 10 August 1990 Background information and results of prior investigations at the site are in AGE's Preliminary Investigation and Evaluation Report(PIER), dated 09 March 1999,and Additional Site Assessment Report, dated 21 March 2001 Ground water data from previous quarterly monitoring events are included in the tables of this report 2.0. PROCEDURES On 25 January 2005,ground water monitoring for the first quarter of 2005 was performed at the site The ground water monitoring activities included measurement of ground water levels and the collection of ground water samples from on-site monitoring wells MW-1 through MW-8 Ground water monitoring procedures for the site were outlined in Additional Site Assessment and Ground Water Extraction Pilot Test Work Plan, dated 31 May 2000, and conform to ground water monitoring guidelines issued by the San Joaquin County Environmental Health Department(EHD) 2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING During the January monitoring event, the depth to ground water was measured in all wells from the top of the well casing to the nearest 0 01-foot utilizing a Solmst water level meter The ground water elevation in each well at the site was calculated by subtracting the measured depth to ground water from the surveyed well casing elevation(Table 1) After the depth to ground water measurements were collected, the wells were purged using a dedicated,disposable plastic bailer A minimum of three casing water volumes(approximately b to ' Advanced GeoEnvironmental,Inc