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<br /> Quarterly Report' Fourth�QuaFrter 2000' �' '
<br /> U •+ * � i r -1 '. i. ,n. 'k•^ t I'x- � I I '. s 1- 'i I I- i � 1,' y I -�- s- �i
<br /> Former HESS DuBOIS.CLEANERS
<br /> 3 WestHardrng Way ' { ti ', ''� ri
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<br /> Stockto aliforn;ta ' k ' '{
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<br /> ].Os°.. 9INTRODUCTION'AND,-SCOPE°.OF WORK v s
<br /> t .At the reguest,of Mi.Peter Wallace;, owner;Advanced GeAnvironmental, Inc`'(AGE) has s,,
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<br /> ;prepared: this quarterly report,detailing.fieU-activities at,348 :Westi Harding way, Stockton, _. ,
<br /> „ California(the site) during the fourth quarter of 2000. ' ,
<br /> The'scope of;work completed during the.quarter'included'rrionitoring acid sampling of sevenon- and i
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<br />' off-site groundwater rrionitoringwells in.Decelnber 2000. The'site setting is illustrated in Figure i
<br /> ' The locations'ofistructures and m'omton g wells on and near the site are depicted in Figure"2.
<br /> 1.0. PROCEDURES
<br /> .Field, activities,at the 'site 'were performed in' accordance with guidelines for the 'subsurface.'.
<br /> !' y investigation�of underground storage tank (UST) sites established by''the Central Valley.Regional
<br /> Water Qualify,Control Board (CVRWQCB) axid'for sampling of ground water monitoring wells by
<br /> the San'Jo,aquin County Public Health Services,-'Environinental•Health Division (PHS-
<br /> 2.L
<br /> FHS=2.L MONITORING WELL PURGE PROCEDURES
<br /> On,22 December.2000, a Solinst water level meter was used to measure the depth to ground water
<br /> in each well relative to-the tops of the-well'casings. The relative ground water elevation,in eachwell
<br /> and hydraulic"gradient were determined from these data(Table 1).
<br /> After ground water depths were measured, a pre;clearied; twa-stage submersible'pump-was to
<br /> evacuate water from wells MW4 through MW-T. Duririg the une`.sampling event, approximately.r' ;
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<br /> 9 to J 5-gallons of water(a'minimum of three casing-water volumes were removed from each-well:
<br /> Temperature,pH,and conductivity were measured at 3-gallon intervals•using,a.Hydacwater analyzer: ; {
<br /> Purged-water was stored in 55-gallon.DOT-approved drums-on-site.'Moniforing:well sta6ilizatl6n
<br /> ;data and field data sheets are included id'.A endlx.A.
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<br /> [ 1.2. 'COLLECTION-OF GROUND WATER.SAMPLES: -
<br /> 'Ground water samples were.collected from each well using new disposable bailers:Ground water
<br /> sam les were collected following the ur in g'•of the wells and recbvery,of at 1east.80/o 4i6
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<br /> purge casing'water v_olume..Imimdiately upon retrieval, thc'sam_ples were transferred into 40-m1' '' y�
<br /> ! i,Advanced'coEnvironmental,Inc`
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