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4' 1 }=iw <br /> s! r °( i z 'r 1• 14. iv,; + ti,—I •'�- 3 P'^�t t a ..yt I' ,� ! .Al 1 i <br /> L-'`r t l -1 {i - i, �s� -{t ' y I i� { 1 H�y Ili ` Is �.�,I {i 0 <br /> 1 _11' <br /> �ry.1' <br /> 1 Iltlw <br /> ,' r 1� ' ` 'r ' e 1 *f •'! at I "0 aH ,aY d,n i'�''��•. <br /> Quarterly Report ::Second Quarterr'2000 �' <br /> •. _ `Former HESS-DuBOIS.,CLEANERS <br /> { _ 348;West Harding Ways= f ! ; <br /> S#ockton,'California... <br /> 1:0. INTRODUCTION AND SCOPE'OF`1WORK ,'. <br /> At the request"of Mr,Peter Wallace;property'owrter,Advanced GeaEnvrronxnental,-1hc'.'(AGE) has <br /> . . <br /> prepared.this Quarter]y eporet"ing'�:field activitie's..ai 348 West Harding-way;,Stockton; <br /> California(the site)during the second quarter of 2000. <br /> The scope.of completed.during the qudrtes,included monitoring and sampling of seven on- and <br /> off-site groundwater monitoring wells in,June 2000. The site settirig'is illustrated iri Figure 1.,The:.: <br /> locations of structuresand monitoringwells:on'arid near the site,are depicted in Figure 2. <br /> 2.0: PROCEDURES' • , - " <br /> Field activities, at the site•were performed•in accordance with guidelines for the subsurface <br /> investigation.of.underground storage tank (UST) sites established by the'Centrai Valley-Regional <br /> Wafer Quality C_ontrol Board(GVRWQCB) and by the San Joaquin.County Public Health Services- < <br /> ;Environmental Health Division (PHS-EHD); - <br />' 2.1.: MONITORING WELL PURGE PROCEDURES <br /> On 09 June 2000, a Solinst water level meter was used to ineasure the depth.to ground water,in each <br /> k i s Well relative to the tops of the well casings: The relative ground water elevation in each well and <br /> , hydraulic-gradient were det&rnined from these data(Table I <br /> After ground water de-the were rheasured a re-cleaned two=sta e submersible' um was-used to <br /> p P g p . p . . <br /> evacuate water in wells_ MWA through MW-7. During-the June sampling event-approxirnkely, 12. <br /> to 17 gallons,of,water (a min-imum'of three casing-water volumes)'were removed.from'each.well. <br /> ' Tem erature, H'and conductive were measured at 3-gallb.dirite.rvals usirig:a Hydac water anal zer. <br /> p p h` _ Y 1 <br /> Purged water was stored in-55-gallon'DOT approved drums'on=site. Monitoring well stabilization,, <br /> data and'field data sheets are included m'Appendix A." <br /> 2.2.' COLLECTION OF GROUND WATER SAMPLES i <br /> Groundwater samples:Were-collected from each well using riew disposable bailers. Ground water <br /> ` sample's were:collectedfollow hg'the purging of tihe.wells and recovery of at lease $0%'ofalie pre ilk <br />• purge:casing water'volume:,Immediately uponretrieval, the samples were transferred-into.40 ml <br /> ~ Advanced 6eknvironmental,Inc. J1' <br /> ,� t ' • _ ' '. ' . 3'• 'F • r; E'• V ', 1 •111 <br />