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1 f 1 , I I tl t i � F I Quarterly Report - Third Quarter 2003 NOMELLINI CONSTRUCTION CO. ' u T 1045 West Charter Way, Stockton, California3 i h 1 1.0 'INTRODUCTION At the request ofMr Dante John Nomellini,Advanced GeoEnvironmental,Inc (AGE)has prepared ' this 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 in Figure 1 Site structures and monitoring well , ' locations are depicted in Figure 2 This report is prepared in accordance with guidelines issued by the California Regional Water Quality Control Board-Central Valley Region(RWQCB)for investigation of underground storage ' 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 in,this report li 20 PROCEDURES On 25 and 26 September 2003, ground water monitoring was performed at the site on wells MW-1 ' through MW-9 and VW-1 through VW-9 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 h County Environmental Health Department (SJCEHD) by letter dated 17 July 1995 As-built monitoring well construction details are summarized in Table 1 1= 2 1 WELL MONITORING AND PURGING, , t On 25 September 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 O1-foot utilizing a Solinst water level meter The 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) After,ground water levels were measured,between 6 arida 16%2 gallons of ground water(a minimum , of three casing-water volumes per well) were evacuated (purged) from monitoring wells MW-1 through MW-9,VW-1,VW-2 and between 1/4 and"/4 gallons of ground water were purged from wells VW-3'through VW-6 utilizing dedicated, polyethylene disposable bailers Groundwater was not . recoverable from wells VW-7;VW-8 and VW-9 and were observed as `dry' Advanced GeoEnviron mental,Inc I I r `