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i 1 t � w Quarterly Report -- Fourth Quarter 2003 NOMELLINI CONSTRUCTION CO. I _ 1045 West Charter Way, Stockton, California I1.0. INTRODUCTION At the request of Mr Dante John Nomellini,Advanced GeoEnvironmental,Inc (AGE)has prepared Ithis quarterly report for 1045 West Charter Way(the site), Stockton, California The scope of work included performance of a ground water monitoring event,removal of free-phase petroleum product - from well VW-1 and preparation of this report The objectives were to monitor concentrations of petroleum hydrocarbons in ground water and to characterize ground'water flow direction and gradient at the site The site setting is illustrated on Figure, 1 Site structures and monitoring well I locations are depicted on Figure 2 4 y, r This report is prepared in accordance with guidelines issued by the California Regional Water ' Quality Control Board-Central Valley Region(CRWQCB)for investigation of underground storage _ a tank (UST) sites Background information is summarized in the AGE-prepared Revised Remedial Action Work Plan, dated 16 April 1997 Ground water analytical data acquired to date is included Iin this report • '2.0. PROCEDURES On 23 December 2003,ground water monitoring was performed at the site on wells MW-1 through MW-9 and VW-1 through VW-7 Ground water monitoring procedures for the site were outlined in the AGE-prepared Interim Work Plan, dated 10 July 1995, and approved by San Joaquin County Environmental Health Department(SJCEHD)by letter dated 17 July 1995 As-built monitoring well ' construction details are summarized in Table 1 I2 1 WELL MONITORING AND PURGING , 3 On 22 December 2003, depth to ground water was measured in each of the above-mentioned wells ' ' from the top of the well casing to the nearest 0 01-foot utilizing a Solmst water level meter The r ground water elevation from monitoring wells MW-1 through MW-9 were calculated by subtracting ' the measured depth to ground water from the surveyed casing elevation (Table 2) Ground water elevations subsequently were plotted and contoured on a scaled site map (Figure 3) i I On 23 December 2003, between 6 and 16% gallons{of ground water (a rnmimum of three casing- water volumes per well),were evacuated (purged) from monitoring wells MW-1 through MW-9, VW-1 and VW-2 utilizing dedicated,polyethylerie disposable bailers, and between 1/4 and%gallons ' of ground water were purged from wells VW-3 through VW-7 utilizing dedicated, polyethylene {, . disposable bailers before being purged` dry" Ground water was not recoverable from wells VW-8 and VW-9 and were observed as `dry' Advanced GeoEnvlronmental,Inc 4 1