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r t �' � r � i•�P 'k •t 1 ; j r.til yr r•1 !�, 1 *. 1 F ,l 1 N rl , l.- t Y. � 'r„ � i � f h � , L 1,. . e 1: � •5 r P if w -w ' tit ". N.L 20 August'2001 AGE'=IVC'Pro�ect:No:,95 0114`' s,:. Vit' ;, ,, Page 2'6 1 a Y S } rTem erature 1,•�H and coriductivity were measured at 3-gallon intervals,using. ah; Oakton water_ arialyzen Purged-water was stored in 55-gall6n DOT-approved-drums b'nsite.•Monitoringfwell stabilization`data and field data shee'ts-are.inc'Iuded in Apperidix.A. 22' COLLECTION OF'GROUND WATER SAMPLES Ground water samples.were collected fromeach.well using new disposable bailers: Ground water'a samples Were collected,following the purging of the wells and recovery of at lease 80%ofthe pre-.. purge•casing.water voluixie: Immediately upon retrieval,the`sarr_ples were transferred'into 40-m1' EPA=approved VOA-6als'containing 0.5 m1 of hydrochloric.acid(18%o) as a,sample preservative,' =, and were labeled, The samples were.transported.in'a chilled container under chain-of-custody to McCampbell Analytical Inca(MCAI)'a State of California Department of Health Services',(DHS)= r' certified laboratory(#1644). Samples Were.analyzed'for: ' 'Total petroleum hydrocarbons quantified as stoddard.solvents (TPH=ss) by EPA Method'' E 8015 Modified; • Volatile aromatic cbirlpounds.- benzene, toluene, ethylbe'nzene and .xylene..(BTEX) with ' 1 methyl-tertiary butyl.,,ether(MTBE) by EPA Method 8020; and • Volatile organic and halogenated compounds(HVO.C) specifically fuel additives methanol, ethanol,'ethylelie dibromide(EDB), 1,2-dichloroethane (•1,2-DCA);tertiary butanol.(TBA), . di-isopropyl ether(DIPE), ethyl tert huiyl.ether(ETBE), tert-amyl methyl ether{TAME),and ' ' confirmation of MTBE by.EPA Method 8260 Modified. ' 2:3. DRILLING AND WELL INSTALLATION PROCEDURES w 1 , On 18 and 19.April 2001;monitoring-wells EW1,,MW8, MW9 and MW10 were installed on-site; on Apri12001, groundwater mbnitoring:well developmcnt was conducted and on 02 May.2001;: t' ; • ground water samplirig,was performed on;the newly installed`well MW-10. . Ground water monitoring procedures for-'the site were outlined,in Work,Plan Addendum For , Additional Ground Water'Investigation, dated'15 November 1995,prepared by AGE and`approved by the PHS-EHD,by permit dated 07'December 1995: r Advanced GeoEniironmental,Inc.