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<br /> terly
<br /> QuarReport. September T999.
<br /> • i' STRONG PROPERTY'
<br /> 5157.West-Business Loop 205,-Tracy;California
<br /> 14
<br /> INTRODUCTION
<br /> y, Advanced Ge oEnvironmental;Inc. (AGE)-has prepared this quarterly report for51.57°West Business
<br /> Loop 205 (site), Tracy, California: The site setting is illustrated on Figure 1. Site structures'and
<br /> monitoring well locationstare depicted on,Figure 2. ,
<br />'` •. The objective of the work was'to monitor dissolved petroleum hydrocarbon c ' centrations"in ground '
<br /> " ,water and to characterize ground water 'flow direction and 'gradient on the .site: This'report 'is
<br />' prepared in.accordance with.guideline§ established by :the San Joaquin County Public Health
<br /> Services,- EnvironmentairHealih.Divi.sion (PHS-EHD)Iand by the Central IValley Regional Water
<br /> ,
<br /> Quality Control B'bard{CVRWQCB) for investigation of uriderg'round storage tank (UST) sites `A
<br /> y ,
<br /> summary 'of previous investigations at the, was included in Preliminary •EvaluatronAnd
<br /> Investigation Report-July 1998, dated 14 September 1998; prepared by AGE. ,
<br /> ' 2�0. ' ^■ 'UARTERL,Y:MONITORING AND SAMPLING•PROCED.URES }
<br /> 4n`22 September 1999, ground watei monitoring'and"sampling was performed at the site on wells .
<br /> e
<br /> ',,MW'l,MW-2, MW-3 and MW-4. Ground water monitoring and"sampling procedures for the'srfe s
<br /> were,outlined in-Work Plan Addendum -'.June 1998, dated,02 June 1999=,prepared.by AGE arid
<br /> iapproved by the PHS-EHD by letter dated 08 June 1998 '
<br /> 2 1 MONITORINGrvWELL PURGE-PROCEDURE-
<br /> i
<br /> p . ground water was measured at each monitoringwell from the tops of the well casings at ;
<br /> the.site to the nearest 0.01°'foot utihzmg a Sotuist waterlevel meter..Ground waier.lelevations in-each
<br /> Weill at the site-w-ere calculated by,subtracting the measkured: epth to grouiid water-from surveyed '
<br /> casing elevations.(Tables 1) Ground water elevations were plottedand contoured on'a scaled site map it
<br /> (Figure 3).
<br /> ' ,After water' levels ,we`re measured, approximately-8 gallons of ground water•;(a minimum.'of three
<br /> well-volumes per well): were removed from,wells•MW-l;`MW-2,;NIW-3 and MW-4 utilizing a �I 1,0 a -
<br /> I disposable!polyethylene hand:bailer I�Temperature,,,,pH- and conductivity of'purged water 'we're
<br /> j measured for stabilizationat'regular purge-volume intervals from each-well;using an ICM-Model }
<br /> 52200 water analyzer Field data and logs.* xncluded)with'Appendix°A. Purged ground water was
<br /> 1 'T i I II ; ` .- ' I' ` lackFn ,.,
<br /> contaaner�zed in 55 gallon drums-and was stored on,site-in an area' g general public access.
<br /> I,r•- ' � ITIS :.: ' S11' I , , r h '. -
<br /> ! ' h Ailvnare'dGeoEnvironmenU1,Inc. ,
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