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Monthly Ground Water Monitoring Report - February 2000 i FLAG CITY CHEVRON 6421 Capital Avenue, Lodi, California 1.0. INTRODUCTION AND SCOPE OF WORK At the request of Mr Richard Bokides of Flag City Chevron, Advanced GeoEnvironmental, Inc (AGE)has prepared this Monthly Ground Water Monitoring Report for 6421 Capital Avenue (the site), Lodi, California The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objective of the work was to monitor dissolved petroleum hydrocarbons and methyl tert butyl ether(MTBE) concentrations in ground water and to characterize ground water flow direction and gradient on the site This report is prepared in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites Background information and a description of prior investigations at the site was included in AGE's Work Plan Addendum - ]March 2000, dated 08 March 2000 2 0. QUARTERLY MONITORING AND SAMPLING PROCEDURES On 25 February 2000, ground water monitoring and sampling was performed at wells MW-1,MW-2, MW-4,MW-5,MW-6 and MW-7, ground water samples were collected from two domestic drinking water wells located at 14659 Thornton Road (Rocky's Restaurant) and at 14749 Thornton Road (Three B's Truck Plaza), ground water samples were collected from two municipal ground water wells located approximately 700 feet and 1,700 feet southeast of the Flag City Chevron site and one grab water sample was collected in a storm drain located 10 feet east of Flag City Chevron monitoring well MW-1 Ground water monitoring procedures for the site were outlined in the Wo?k Plan Addendum dated 28 January 1998 and approved by the PHS-EHD by letter dated 24 February 1998 2 1 MONITORING WELL PURGE PROCEDURES Depths to ground water were measured in each well from the tops of the well casings at the site to the nearest 0 01 foot utilizing a Solinst water level meter Ground water elevations in each well at the site were calculated by subtracting the measured depth to ground water from the surveyed well casing elevations(Table 1) Ground water elevations were plotted and contoured on a scaled site map (Figure 3) After water levels were measured, approximately 9 to 16 gallons of ground water (a minimum of three well-volumes per well) were removed from wells MW-1, MW-2, MW-4, MW-5, MW-6A, Adianced Geo En+ironnienlai,Inc