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<br /> ,i� 21'zNovember 1996
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<br /> AGE NC ProaectNa..95 0114 , i w, �,, I :I,�a ; 1 r ••+ .r } r .'rt P 4 rL,
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<br /> Page 2-of,4 I, £` h ,� 1 L,r 4 i.'�.r 'i' - 11;L 4 �t 1 Ity ',' •i 3 i f r. } .`�� �'� �,r, f n =a 1?r yNl'
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<br /> s >` analyzer. Purged water'•was storedrin 55 gallon dr' uns on site 'lvlonitoring,well stabilization Baia and
<br /> 'field data'�sheets are included to Appendiz'A F �
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<br /> COLLECTION OF GROUND WATER SAMP4. LES °r
<br /> 4.
<br /> I Ground watef s'amples'w'ere collected from each well using,new.disposabid'.bailers.:Immediately;
<br /> ' upon retrieval,""the'sampl s were'trans feired into'.40-im1'EPA'viAs containing 0:5'ml of:,118%,'
<br /> hydrochloric-acid as a sample preservative, aiid were label`eci. Tlle'sampte's were transported in a.E,� H
<br /> x chilled,'-container%under -chain of custody.to'.Aipha':Ahalyti'cal ,Laboratories' (AAL} ii�r Ukiah; `
<br /> r _r.• r. ., : :.. _ `
<br /> California:Eachr'"satnple was analyzed Tor,TPH ss (Stoddard solvent) and BTE&X in accordance-,z ' '
<br /> 1 with EPA,mehodGFID15030 an 02,.re
<br /> speettvely.:` : "
<br /> DISPOSAL:OF PURGED GROUNDWATER
<br /> _ In an attempf to dispose Pfpurged,aro'und water into; he'City'of Stocktbn's'saniiaty sewage system;.,
<br /> ,4GE requested a perr`nit for.`disposal;from.the Department of 1Vlunicipal Utilities:An'ap'plication:for'
<br /> waste water.discharge.was not approved,by the'City. According to Ms.Toni,Duncan and Mr. I arry
<br /> Williams of'the i _
<br /> ,1 .. . _ C ty'of Stockton MUD,.IPH-ssdtscharge tntopthe sanitary system isLprohibited. s
<br /> I' — � ' • � ': _ ,.; . '; � :,SII
<br /> On.30 September'1996, eleven drums of'previously purged water were collected by Shop Hazards . W
<br /> a Solutions; Inc. of Turlock, California, for final disposal at a licenced treatment facility. A copy of,' 'r
<br /> the:transporters manifest is included in'Appendix D.
<br /> 3 0. FINDINGS."` r „
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<br /> GROUNDWATER GRADIENT AlVD.DiRECTION'.
<br /> During the September 1996 sampling, the depth'to groundwater at the site ranged from 32:13 to
<br /> k 32'.78 feet bel'o'w.tops'of the'well casings: The average relative'-ground water elevation ai'ihe site
<br /> decreased-"'app'roxtmately 1.03 feet.stnce,the'rJune 1996, sampling.event:,Relative 'ground water.'. r.
<br /> _:elevations are summarized in-Tabl'e:.]. The,dominant•grourid water:flow-directiori for the sampling j r`'
<br /> r event in September 1996'was toward.the'n�-itheast 6°E)at a gradienfof 0 017 ft/ft-in`the'vicinity::;
<br /> of the former USTs.•The.calculated gradient fori:September'1996 is consistent with the historical'. ;
<br /> 4 ;
<br /> � 7r•a
<br /> e gradient'at:the site.Ground water-flow directton;is'depicted'in Figure 3T- Relative Ground Wale1-
<br /> Elevation.' til h
<br /> f' .. .. - _ _ _• 1. ._ � e" �.n . .r r � .., .r,Yd i.
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