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. Quarterly Report - Second Quarter 2003 NOMELLINI CONSTRUCTION CO. 1045 West Charter Way, Stockton, California I ' ' 1.0. INTRODUCTION I At the request of Mr Dante John Nomelhm,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 I 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 2 0. PROCEDURES On 12 June 2003,ground water monitoring was performed at the site on wells MW-1 through MW-9 and VW-1 through VW-7, wells VW-2 and MW-8 were not monitored during the June 2003 monitoring event due to the well boxes being concealed(burred)and not readily available However, I AGE utilized a metal detector to locate and expose each buned well on 10 September 2003, thereafter, wells VW-2 and MW-8 were monitored and sampled on 25 September 2003 as part of the Yd Quarter 2003 ground water monitoring event 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 I I 2 1 WELL MONITORING AND PURGING IDepth 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 ground water elevation in I each well was 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) ; IAfter water levels were measured,between 1 5 gallons of ground water(a minimum of three casing- water, volumes per well) were purged from wells VW-3 through VW-7 utilizing dedicated, IAdvanced GeoEnvi ron mental,Inc i