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�l�tl �j IrYa{'v�y7�,''IT I yr y.,'_t'i! , r 3 t .R; } *t fl Px F f t�. .• t s 11 r AIJ-'. ; Liy y' ' .1 e R a n I t.q i w rll7 s i s•,r !I� n4y F s A! j 1j j A 'I20ll0 04May 5 AGE NC Pro}ectN '4 6. • S Gill, i I r` Page 3 of 8' .:,,. ? , ,41t ` ` ; , <}ti i, .. - T r i s J 2:5:' 'MONITORING WELL PUICYPROCEDURES rr]](�E `.. - •. - •.,' • , y .I• �, � f '^ , Ili S . i ,J A. V ;D F , f On'28:January 2000;'dS61inst water level meter'was.used Admeasure;the,depth to groundwater in each well.relative to the tops"of the well casings: The relative''ground water elevation in eacli'well "and liydraillicFgradient were determined from these dafa(Table l). After ground water depths were measiued,,a-pre-cleaned, two-stage submersible purrip,was used to,, ' ,I evacuate water in\dells MW-:1'throu h MW-7.- the Jams sam lin•`event,'a roximatel g. . g � P g pp Y 1-2 t6, 15. gallons of water. (a minimum of three.well volumes) were removed',&orn each well: Temperature,pH and conductivity vwere mea'sured,at 3-gallon intervals using a'Hydac water analyzer. i Purged water was stored in 55= allon DOT-approved drums'on-site. Monitoringwell, stabilization,s..` data'and fiel'd-•data sheets are included in'Appendix'B. ` 2.6. COLLECTION OF GROUND WATER SAMPLES Ground water samples were collected from`each well using new disposable bailers. Ground water samples,were collected following the purging of the wells. Immediately upon retrieval; the samples were transferred into 40-m1 EPA-approved VOA vials containing 0.5 ml:of hydrochloric acid(:18%) as a sample reservative and'were labeled. The samples were transported in a chilled container . p P � p P _ under chain-of-custody to-Kiff Analytical a State of California Department of Health Services (DHS)-certified laboratory. Samples were analyzed in.accordance.with: •: EPA Method 8015 Modified for TPH-ss ' EPA Method.8020 for BTEX and • EPA Method 8010 for HVOCs. 2.7. SURVEYING t The elevation of the top of eachwell casing installed for the Hess Dubois investigation was surveyed ; ' relative.to City of Stockton Bench Mark ##24. On 30,December 1999, a California state-licensed survey engineer from Baumbach&Piazza, Inc. surveyed a reference point on the-top of each ground% 1. •water Inonitoring well casing at the site to the-nearest�0.01-foot relative to•the City of Stockton Bench Marks and Description at 9.71 feet above mean sea level'(msl):The results of the monitoring , well survey are contained in Table'.I.,The surveying report (Baumbach,& Piazza) is presented in- Appendix C. .` _ Advanced GeoEnvironmentil,In"e. • _ _ j moi, ,n i