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' rQuarterly Reort - First Quarter 2001 ' Local Food Store ' 2650 Monte,Diablo Avenue, Stockton, California 1.0. N INTRODUCTION ' ;At the request of Mr Liaqat Khan of Local Food Store,Advanced GeoEnvironmentaI, Inc (AGE) has prepared this quarterly report for Local Food Store, located at 2650 Monte Diablo Avenue, Stockton, California(tile site) The scope of work of this investigation included ground water monitoring and sampling of four - rr onitonng wells on 28 February 2001 and preparation of this report of findings The location of the site with respect to its surroundings is illustrated in Figure 1 On-site structures, boring and monitonng well locations are illustrated in Figure 2 ' ' This report is prepared in'accordance with Central Valley Regional Water Quality Control Board - guidehnes for subsurface investigations of underground storage tank (UST) sites General background information and data were presented in Preliminary Evaluation and Investigation Report, dated 04 August 2000, prepared by AGE 2.0. PROCEDURES The field activities were performed-in accordance with the San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD)-approved Preliminary Sate Assessment Work ' Plan prepared by AGE, dated 29 November 1999 1 21 GROUND WATER MONITORING ACTIVITIES On 28 February 2001, a ground water monitoring,event was conducted at the site The monitoring ' - activities included the measurement of depths to the groundwater surface within wells and collection of ground water samples from the four monitoring wells 1 The water level in monitoring wells-MW-1 through MW-4 were measured relative to the tops of the well casings using a Solmst water level meter After water levels were measured, a two-stage submersible pump was used to purge each well Six gallons (a minimum of three casing-water- ' volumes) of water were removed from wells MW-1, MW-3 and MWA and twenty-five gallons of water were removed from well MW-2 ' Temperature, pH and conductivity of the purged water were measured at two-gallon intervals for • MW-1, MW-3 and MW4 and at five-gallon intervals for MW-2 Temperature,pH and conductivity .