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f , Quarterly Report;= June 1999 STRONG PROPERTY 5157-West Business Loop 205 _ Tracy- California 1.0. INTRODUCTION Advanced, GeoEnvironmental, Inc..."(AGE)' has prepared,this Quarterly Report for- 5157 West Business Loop 205, Tracy;"California. The site setting is illustrated on Figure'1. Site st uctures'and ' monitoring•well 'locations are depicted-on.Figure 2. The objective of the work .was to rnonitor dissolved petroleum hydrocarbon concentrations. in ground water and to characterize ground water flow,dii-ection and, gradient on the site. This-report vis prepared_.in-accordance.with guidelines' ' established .by 'the San Joaquin County-Public Health Services- Environmental Health Division (PHS-EHD) and by the Ceritrai Valley, Regional,Water Quality Conti-ol Board,(C`JRWQCB)'fox'''' ' investigation of underground'storage tank (UST} site's. A'suminary of previous'investigations at the ..Site, was included in` Preliminar Evaluation And Investi ation Re a-t - " Y g p July 1998,' dated 14 September'1998, prepared by AGE. 2.0. . QUARTERLY MONITORING AND SAMPLING PROCEDURES On 14 June.1999., ground water monitoring and saripIing was performed.at the site on wells MW-1, ° MW-2; •MW-3 and MW-4. Ground water monitoring and sampling,procedures for the site were outlined in TVork Plan Addendum -June"1998,,dated 02 June 1998 prepared by AGE and approved by the PHS-EHD.by letter dated 08 June 1998. 2.1. MONITORING WELL PURGE PROCEDURES. epth to ground water was measured at each monitoring-well from the tops of the well casing's,at D the siie'to the nearest,0.01-foot utilizing a Solinsi waterlevel meter: Ground water elevations in each well at the;site were calculaied by subtracting•the measured.depth to ground 'ater from surveyed casing elevations(Table 1):.Ground water elevations were plotted and`contoured on a scaled site map (Figur`e 3) ' . After water level's we're measured,;approximately 8'gallons of,ground.water (a,minimum,ofthree . well-volumes per well) were removed from ixells M '-L MW-2, MW-3`and'IvlW=4 utilizing atwo= stage submersible pump; duringground water evacuation (purging);ground water,was pumped from ' near the top of each water'c6lbmi to facilitate removal of all stagnant water. Temperature, pH and I conductivity of purged water Nvere;measured for,stabilization at regular purge-volume intervals from each well using ;an,ICM Model,52200 water anafyzer. Field-data-,and logs are,included wiih' .. . Append-1,x A. Purged ground «-ater wa's containerized in 55-gallon drums and was-stored on-site.in an area lacking general'public-access. = IAdiwncedCcoEn%ironmcntal,Inc.