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<br /> �� November 2005,
<br /> AGE-NC P' g6W
<br /> ro�ect'No 0235
<br /> ' ry , Page2of13 '
<br /> " � 2„ 1 y z WELLMONITORING
<br /> AND,EVACUATION `
<br /> fA Solinst water'level meter was used to measure�the;depth to,ground water in tweet -two wells
<br /> r
<br /> 4� 6 I�"'�relative to tYte tops�of the sure
<br /> casings -The grouridfwater elevatlons'ancl gradzent�were det
<br /> from these measurements (Table 1) ermined
<br /> i " 1,
<br /> 1 k 1
<br /> 1 .. �
<br /> I ' � 311` 1 t•h " ` 1
<br /> ,r1 After iecording water,level measurements, wells 'MW_l;,MW-2, MW-9, MW=l -1113O, MW
<br /> ` 1'`413 and MW-1 SB
<br /> MW-12B,MW- we're purged,of standing water utiIizing a Waters inertial pump
<br /> �, I
<br /> or a dedicated disposable plastic bailer; between 4'and 25 gallons of water were removed from
<br /> each
<br /> " of the wells Ground water temperature,pH and conductivity were measured at regular purge-volume`
<br /> intervals using an Oakton water analyzer Field sheets and data are included in Appendix A Purged
<br /> wN! water was stored on-site in`labeied,S5-gallon Department of Transportation(DOT)-approved drun
<br /> 22 COLLECTION AND`ANALYSIS OF GROUND,WATER SAMPLES N
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<br /> ,Water samples were collected from each purged well utilizing'the discharge tube`of the Waters
<br /> inertial pump,or a nein, dedicated 'disposable plastic bailer after allowing the wells to a
<br /> 1 . minimum $o% recovery of the pre-'purge water volume Each water sam thieve a
<br /> „+Jto
<br /> '40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric'acid as a samerred ple
<br /> a4�
<br /> ppreservative acid 1-liter rriber bottles without preservative After collection, the samples were �`J-,
<br /> roperly labeled, placed in'a chilled container and transported under chain of custody to
<br /> Environmental Laboratories`(CTEL), a State of California Department of Healthy Cal Tech
<br /> Services (DHS}- ,
<br /> certifiedranalytical laboratory, and were analyzed for '
<br /> ' , r ' )D 1
<br /> •' Total rpetroleum 'hydrocarbroris 1 quantified as gasoline (TPH=g)' and total petroleum
<br /> C= , hydrocarbons as'diesel (TPH-d)
<br /> ,In accordance with EPA'Method 8015M and,
<br /> rrry; , i
<br /> Benzene,toluene,etliylbenzene and total xylenes'(BTEX)and the fuel additives di-isopropyl
<br /> ` ether(PIPE);ethyl tertiary"-butyl ether(ETBE),`meth 1 tertiaryr
<br /> amyl methyl ether (TAME), terti bu 1 alcohol TBA -butyl ether{MTBE),tertiary-" ,
<br /> Y- tY ` }, 1;2-dibromoethane (EDB} and
<br /> 1,2-dichloroetliarie (1,2-DCA} in accordance'
<br /> EPA Method 82608 Y'
<br /> ` 2 3 r ,'CPT INVESTIGATION
<br /> Between,21 22 borings �
<br /> y, ,, y'iand 23� September, four CPT so11 ings (CPT-10 through CPT-13) and�five
<br /> hindividuall established borings(CPT-10 through CPT-14)'for collection of ground water'samples ` r
<br /> ` J'were advanced at the southern UST'No 3 location (Figure 2) CPT soil borings were advanced t
<br /> define -the 'lateral and vertical :extent of ° J `
<br /> a petroleum hydrocarbon-impacted ground �water
<br /> I
<br /> AdvancedGeoE
<br /> nvironmeutal,Inc
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