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;j 4 .iii- ; - r. . �• QuArterly.Re'port, .January 1999 ; t HESS=DuBOIS CLEANERS -348;West-Hardirg Way: - < a r Stocktou,_Califa"rnia' 1 `i+k st, tr' S r ft r j. •• -'t L .e A � INTRODUCTION AND;SCOPE'OF:W_ ORK k At the request'of Mr. Peter Vallace,'property owner,Advanced GeoEnvironmental, Inc.•(AGE)has.. f..prepared-this Quarterly Report detailingdactivities at,348.WestHardin .Wa �.Stockton b _ "California(the.site): The:objective of the work was to monitor ground water conditions at the site. ' The site location and surioundings are illustrated" .Figure .1:_ Structures an d`monitoring,well e locationsare shown in Figure 2. 2.0., PROCEDURES. ,.. ; Field activities at the `site were performed- in accordance with guidelines for; the-subsurface. ; investigation of underground storage tank(UST) sites established by the Central Valley Regional Water Quality Control Board(CVRWQCB)and by the San Joaquin County-Public Health Services= Environmental Health Division (PHS-EHD). > 2.i.. . MONITORING WELL PURGE PROCEDURES'. ' On,15 January 99,a Solinst water level meter was used to measure the depth to ground water in each well,relative to the tops of the well casings. The relative ground water elevation in each well and hydraulic gradient were determined from these data(Table:l-): After ground water depths were measured,a pre-cleaned, two-stage submersible pump was used to . '' purge.wells'from the upper most water to down to,the screen interval,of wells MW-1, MW-2, MW- 3R;MW-4 and MW-5. Wells-MW-l and MW-2-re uired the um _ to be lowered deeper in to the q pump P well;during purging and were observed to-produce less water pet•minute than the-remaining wells. During the January sampling event,•approkimately L5"gallons of water (a minimum-of three well volumes) were removed from each well. Temperature, pH and conductivity:were measured at 2= gallon intervals usingan ICM water analyzer. Purged water was stored in 55-gallon DOT-approved drums ori=site. Monitoring-well stabilization data and field'data sheets are included in.Appendix A.' 22. . ' COLLECTION,OF GROUND WATER SAMPLES tDuring.the,sampling'. event ground water samples were.collected,from,each well'using new disposable bailers. Ground water samples were collected following the' gin the wells -Advanced GeoEnVironmental,Inc.