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> F - <br /> sem. <br /> 16 May,2000w <br /> AGE-NC Pro3ect No. 95 017.3 <br /> Page 5 of 6 s <br /> 1ff�Ck <br /> Joaquin'County=Public Hedlth :Senliees.;Environmental Health 1Drvision .Well=Standards) and <br /> CVRWQCB guidelines (Tri-Regional Water Quality•-;.Control Board:.Recommendations for. <br /> Neliminary.Investigations and Evaluation-of Underground-Storage Tcinks) sampling protocols <br /> jr <br /> _♦F-y^"y A - - 1ST' I' ' - '3 YS J <br /> - 3:5.1 Static Water Level Measurements .semf _ - _ x r <br /> rte. - - - - <br /> ` Prior to all::ground water purging acid sampling; static wateraevels in each well_will be,measure -Ln <br /> . ., <br /> usmg_an elecmc water level indicator. Water level.data <br /> will be recorded to the nearest.0.01 foot from - -� <br /> y .; <br /> a='refer-epee}point:marked on'the t'op of_each PVC well casiri :-Before and after each,use, the cx Er <br /> measurement device will be rinsed�with clean tap water, <br /> - Y{ . . <br /> Well Evaeuation ,._ - , u- <br /> - <br /> _ �'F - �y --_ '-.. .. '. 3 � .,- � _• J Tom' k <br /> - Subsequent to riieasurement.oflepth to vwater-arid pno to sampling,each well will be_purged using r <br /> abailer or.submerslble pump-to,ensure that the sample:is representative4. of the suiroundmgRaqutfer ` <br /> ground water:-The well will be purged until: l) a minimum of three.casing volumes is::removed.fro.In <br /> ' <br /> 4 - . <br /> `' the well;-and/or 2)-the_field-measured groundwater parameters have_stablllzed 14 wever"i the well <br /> 1 s. <br /> Js s"urged dry prior to.evacuating .three casing volumes, a ground- <br /> water_sample will be collected <br /> following 84:percent recovery.of ground water within the well or within 24-hours:of well evacuation <br /> . � <br /> f ; <br /> ;Sample Withdrawal <br /> Water.samples will,be collected-from the moriitonrig.welhusing .a new;pre cleaned.disposable <br /> ' polyethylene bailer, These bailers are'-,d'i"sposed=-of after orie`use.and:require no�decontaminating, <br /> thereb' nminilnizin cross contaminatio'fi,a .to_sam lin devices Sam les will he"drawn and <br /> Y- s. ._ . p g p <br /> -= =� colle' ed,•in:such a manner that agitation and exposure of the groundwater to the atmosphere is' <br /> Y.w rninlmaL-Sample confainers will be filled using-the`appropriate disposable sampling attachment ° ?�, <br /> v�hich allows controlled flow but-of the bottomof-the baller,.by lifting the.check valve; <br /> { _.14- <br /> 5 <br /> Mt <br /> S3 5:4 Sam le.Handling <br /> .Ground wate'r samples will be collected into laboratory-supplied coritalner5 Ground water samples- <br /> 4 S <br /> for.TPH=g, TPH-d,,:BTEX and..fuel oxygenate`(EPA;:g260)'_anaiyses will be:collected into 40-rn1 <br /> VOAvials-containing Q.5-m1-of hydro acid as preservati��e and---into one liter arnber.bottles. <br /> Following collection the samples will be appropriately:labeled and placed an ice and kept in a cooler.. <br /> -�• <br /> ;un#il delivered.to the laboratory,for analysis Chain-of,custody protocols will be used to document <br /> - f <br /> "- ' = <br /> } h as z <br /> - 4 Adianced GeoEn%ironmental <br /> `..c`r Y - ate_s s- 3'ri p" ._ -r-.•-ra -�' ..'.r nx-- —t °-- y 1� -x -p '.-'. <br />