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<br /> 21,•October 1996 .
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<br /> -not:puirged; on 17 July I996..On.17 September l'996,'regular quarterlynionitoring activities,were�.-
<br /> ;performe"d-at the'site,4hich also-included,MW-14-and EW-1. .As'during recent past monitoring
<br /> k. event.s;:wells MW-1through M-W-5,did notcontain enough water for sampling., i T,
<br /> s
<br />' r 2.2.1. MONITORING WELL-PURGE PROCEDURES
<br />' On 17 September 1996; a.Solinst'water level'meter was:used to measure the depth to ground water
<br /> _-in eachmonitoring well..(Table 4). -Monitoring well EW-1�was;purged.using.a.2-inch 'submersible-
<br /> pump. Monitoring wells'MW-6 through iY1W-14 were-purged:using clean PVC bailers A'minimum r
<br /> of-three well volumes.of water'were removed"Trom eacliWell.
<br /> Temperature, pH and:"conductivity of,the purgg water.were measured at,approximately 1-gall6n, f
<br />'. intervals (10- allori ,intervals for-EW-1 rusin aTCM water anal zen--Dissolved oxygen wa
<br /> g ) gn.. Y Y� s .
<br /> measured in each well during purging. Monitoring well stabilization.data and field, sheets are ,
<br /> included.in'Appendix'X Tl e purge:water wasplaced in DOT.-approved druiris:and'stored 6'n'-site.
<br /> lip2.2.2. ' 'COLLECTION OF GROUND WATER SAMPLES
<br /> .Water samples were.callected from each`purged well,using'disposable plastic'bail'ers,,Inimediately
<br /> upon retrieval, the samples.were transferred into,40-ml EPA vials containing hydrochloric acid as '
<br /> a preservative and were-transported in a chilled container to McCampbel1.Analytical, lnc. (MAI)..' `
<br /> Sarmple's were analyzed-for TPH-g and'BTE&X in,accordance with-EPA methods 5030/8015m, and
<br /> „r
<br /> 602, respectively.�Samples from MVL1=7, MVT -'8, MViW-9; MW-1y2,MW`17 ; MW�,1'4,and EW-1 were
<br /> • also.analyzed-for volatile halocarbons in accordance;with EPA method 601. -The sample from MW
<br /> 14 was also analvzed for ethylene.dibromide '(EDB} in accordance,with EPA rimethod 601'.
<br /> SOIL GAS.MONITORING ;
<br /> Seven remed"Wionwells (VW=1 through VW-7), three dry monitoring wells (MW,-3 through'MW
<br /> r5), and MW44 are connected to a low-pressure blower that provides oxygen in'air to the subsurface, '
<br /> The.blower'is commonly turned off.forl'activities associated,with the business located at the-site. =
<br /> On'17 July 1996, thepercentages of oxygen and carbon dioxideiin the soil..gas of the vadose zone
<br /> were: nieasured.'usirig a GasTech OZ/COi: _analyzer as Feld 'instrumentation. Organic vapor,
<br /> concentrations in the soil'gas,were measured in- artsper million using-,a photo=ionization detector
<br /> (PID): '
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