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<br /> 19 Febniary 2002 fi � � `� h�i `'� '
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<br /> , ` �z 2 5� CPT DRILLING AND GROUND=WATER COLLECTION PROCEDURES
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<br /> 11 1 #� `� A'2:5'tori,truck-mounted CP.T drill':ng equ�ppedwith 2=inch diameter h_ollow!steIn rod`s fitted with s:
<br /> a H-ydroPunch ground water sampling tool utili ed a hydraulic ram to advance to specified depths ; ,�
<br /> r F iii each soil'borin A`H droPunch sam le tool was ushed into the s, ecified zone,-the withdrawn _r . F ;
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<br /> . v approximately three feet to expose-a`n inlet-screen., The'nterior ofthe-sampling tooI filled with water;„� . .1
<br /> ,,,E, _ �� and a Y,=inch'outer diameter.(O D:)stainless steel bailer was lowered:and utilized-to extract a ground -r y I -
<br /> � µ water sample_,Ground water,sampl-es•were'eollected,from each-selected depth�ir terval(zone) based "t � �
<br /> - �� .on pre�iausly acquired CPT-litliology.data indicating favoYable conditions foI.r:sarnphng glound N , }��
<br /> ' "�jtrwater All rinseate generated,during drilling activities was coritainenzed in properly labeled DOT ;
<br /> 4 - approved=55-gallonAr.ums,,arid was stored`ori-site in an area lacking;public access All soil borings ; o_�
<br /> were backfilled•over their entire depth with a portland cement grout mix - , � , � .
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<br /> - Foilowin sam le_collection;°each preserved sarriple was logged on a chaizi=of!c�ustody�forrn placed--
<br /> ,� � 1. g p, 7. $ .
<br /> ,` - f a chilled container-and transported to a:California Department of health Services (DHS) certified' . �y
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<br /> q. � :laboratory' for analysis for _ . .. .� ;- ;r _: � ,� __ 1. = .
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<br /> Rt S:.. . _Total petroleum hydrocarbons quantified W as� ga9oli -e. 7 UlgIl by, EPA Methods :;
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<br /> 7.- ..., 8Q15-,5030,°'- -- � '- - ^` 'X , `��n. �'�` a.'� y, f=-} #..s y ,�''.' -r`"- -' - a �.
<br /> ` - •�k -Benzene toluene efiti ibenzene and x lene TEX with meth 1 tern bu 1 ether1. TBE '� w
<br /> r - bV EPA Method 8020, and �" 3� ,-� � � � x -s , z f sE i
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<br /> s ` Eth lene dibromide, EDB and 1;2 dichloroeth- 1 2.DCA ,tern/ liutaiiol TBA , di __ _j
<br /> fr �� `isopropyl etherr(DIPE), ethyl tert butyl `ether(ETBE); tert amyl methyl ether(TAME) and
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<br /> � MTBE.by EPA Method 8260M, � r � �"
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<br /> 2 G: LABORATORr.jY RESULTS Of -GRAB GROUND=WATER SAMPLES4 ;3
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<br /> I. total of-seven-.`°grab Bound water •samples:were coileeted,from•CPT�1 acid CPT 2A and '
<br /> f� submitted'for laboratory analysis far the above mentioned constituents ' ` �
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<br /> TPH was-detected iri a water sam le;collected from CPT 1 at de the between 117 to:120 feet bs
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<br /> _.: - ` r-':(HU.7)�at,a concentration-of 200- -,,1crograins_per Liter(Ecg/l) im
<br /> ;:and iri threewater,-sainples�col.lected -�C.�
<br /> K- y from CPT-2A at;depths of 106 to 115 feetbsg'(HCT6}, 121 to 1°25 feet bsg(HTJ7) and 136 to 140 feet__ �,
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<br /> E- "`-3 bsg`(HU9) at,:conceritirations as _high asw680.ug/l The laboratory reported all the above sample : -
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<br /> ,? . �� chromatograms.as hamming significant unrriodified or weakly modified gasoline patterns F --F
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<br /> BTEX compounds were detected m`aCPT-ls water sample co 6c 117,and 1Z0feet bsgR t
<br /> (HU7) at concentrations as high as-3Qµgll; low_concentrahons of toluene and xylenes were 1.detected r�� t-`< �y
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