I ~~ r. ~i '. 'c,,';.! APPENDIX C ORIGINAL. i, '

Transcription

1 ., t' ~~ r. ~ '. 'c,,';.! \.... APPENDX C ORGNAL, '

2 ' '..f ; FACT SHEET #10. Sol Confrmaton Samplng Gudelnes Under the Voluntary Remedaton Program n ther 2000 sesson, the Wyomng Legslature created new opporluntes,. procedures, knd standards for voluntary remedaton of contamnate;! stes. These provsons, enacted as Artcle-s 16, 17 and 18 of the Wyomng Envronmental QualtyAct and mplemented by the Wyomng!Department of Envronmental Qualty (DEQ), wll govern future envronmental cleanups n!wyomng.. ' Ths Fact Sheet prbvdes gudelnes for sol confrmaton samplng under the Voluntary Remedaton Progr~m (VRP)., 1. What s sol cqnfrmaton s~ and WhY~ needed? Sol confrmatonsamples are samples collected at the completonof excavaton beneath oradjacentto areas!fromwhchcontamnatedsolhas beenremoved- that s, at the base and along the sde walls of an excavaton pt- to determne ot verfywhether cleanup levels have been acheved. Sol confrmatonsamplng s necessayfor all remedes that nvolve sol excavaton. Solconfrmatonsamplng s one ofthe keyelements of the VRP, because t gves volunteers and DEQ a way to evaluate the effectveness of cleanups and make decsons about ss~ance of certfcates of completon'and other labltyassurances...2. How are conf~maton sam~roaches develo~ed?! ',, DEQ has develope~ a standard approach to sol confrmaton samplng. The standard sol confrmaton samplng appro<;lchs descrbed, n detal, n the gudelnes attached to ths Fact Sheet. Volunteers should followthe gudelnes,carefullyto determne mportant confrmaton samplhg features such as the number of confrmatonsamples, samplng., locatons, and analytcalmethods. ndevelopngthe sol confrmatonsamplng gudelnes, DEQ made a numb~r of key decsons ncludng: ' ', " ' Stes are classfedas smallor large basedon the excavatonarea., n general, small stes hlave excavaton areas of 10,000 square feet or less. Large stes have excavaton areas of more than 10;000 square feet.., The numberof confrmaton samples s specfed for small stes anp determned on a ste-by-ste bass for large stes. '! Dscrete samplng methods are to be used; compostng samples for confrmng completon df sol remedaton s rot acceptable wthout pror approval from DEQ., ', Stand~rd U.~. Envronmental Protecton Agency (USEPA) analytcal methods and qualty assu~ance/qualty control (QAlQC) procedures are requred, wth laboratory reportng lmts that are approprate to (Le., equal to or lower than) cleanup levels. ' Fact Sheet #10 04/15/04 v.5 APPENDX C, ORGNAl

3 ORGNAL t"-~ <, - ~" ~.f; j" t '. ;, ); " ~- Because all cleanup stes are dfferent, the standard confrmaton samplng approach provdes opportuntjes for volunteers to develop more ndvdual approaches for large stes and under certan bther crcumstances subject to DEQ approval. Whle ste-specfc varatons are allowed, DEQ strongly encourages volunteers to follow the standard approach to sol co'lfrmaton samplng as much as possble. Usng the standard approach wll allow DEQ to quckly evaluate your cleanup and make decsons about certfcates of completon and other lablty assurances. 3. How s sol confrmaton sam,= documented: Careful documenta~on of sol confrmaton samplng s ve,ry mportant. At most stes, volunteers wll develop a Sol Confrmaton Samplng Plan asl part of remedy selecton. The content of Sol Confrmaton Samplng Plan s covered n detal n the attached gudelnes. n general, these plans shoulc! descrbe: - 0 Planned SOl!excavaton area ~r areas. -0 Planned sa+ple locatons and ratonale. 0 Approach to sample analyss and planned analytcal parameters and methods. 0 Approach tol data evaluaton. < More nformaton on Sol Confrmaton Samplng Plans -s ncluded n the attached gudelnes, There are certan stuatons where sol confrmaton s needed but a Sol Confrmaton Samplng Plan s not requred. The most common example of ths s a small ste (less than 10,000 square feet) that s accepted nto the ndependent Cleanup Process (CP). The CP s a streamlned admnstratve process desgned for stes where contamnaton s lmted to sol and where the remedy s excavaton to cleanup levels approprate for unrestrcted ste uses. For morel nformaton on the CP, see the Fact Sheet #6 ndependent Cleanup Under the Voluntary Remedaton Program. Although a Sol Confrmaton Samplng Plan generally s not requred for CP stes, DEQ cautons volunteers that wthout pror DEQ revew and approval of sol confrmaton samplng actvtes, the Department may requre addtonal samplng before makng a decson about ssuance of a certfcate of completon or other-lablty asst!jrance n addton, at the!completon of sol confrmaton samplng all volunteers (ncludng volunteers wth sm~1 stes - n the CP) should prepare a Remedal Acton Completon Report to document the results of sol confrmaton samplng. The content of Remedal Acton Completon ~eports s descrbed n the attached gudelnes. 4. What f my confrmaton samplng reveals that cleanup levels.have not been acheved? DEQ understands t~at clea~up projects are teratve and that t can sometmes be very dffcult - even wth proper plannng - to determne the exact amount of excavaton that wllbe needed.to ach~ve cleanup levels. f your sol confrmaton samplng reveals that cleanup levels are not acheved, DEQ wll work wth you to dentfy addtonal remedal measures, such as kddtonal sol excavaton, that are approprate for your ste. - Fact Sheet # /15/04 v.5

4 ORGNA. ~!! () () ngeneral, DEQadvses volunteers to watfor DEQrevewand approvalofsolconfrmaton samplng results b~fore backfllngexcavated areas. Ths wllavodthe need to completely re-excavate f DE(Qdetermnes that addtonal samplng (or addtonal sol removal) s needed. Of cours~, you should at alltmes properlymantanexcavated areas so that they do not pose a hazard for workers or the publc. 5. How can ~et more nformaton about the VRP?,. For more nformat~n,to learn abo'~tvrpstes ~ryourcommunty,to obtan copes ofother VRP Fact Sheets ahd gudance documents, orto volunteer, qontact DEQ at (307) or through the VRP web ste at The VRP web ste s updated frequently and ncludes the latest nformaton about DEQ's progress n developng gudance, polcy, and other supportng documents for the VRP. ",' " Fact Sheet # /15/04 v.5

5 l., '0. \. { 1. Gu[delnes for Sol Confrmaton Samplng T confrmato~ Samplng Approaches. Collecton of sol confrmaton samples usng the followng samplng approaches should be done followng excavaton and removal of dontamnated sol: a. Small stes: ~10,OOOsq. ft. of excavatonfloor area (e.g., pt, trench). The followng tables should be used to determne the mnmum, number of. samples necessary from the excavaton floor and sdewalls. A mnmum of fve total confrmaton sol samples should be collected, one from the base and ohe from each of the sdewalls. For rregularly shaped excavatons wthere four walls are not readly dscernble, dvde the total wall' permeter nto four segments of approxmately equal sze for <?ollecton of excavaton sdewall samples. Sdewall samples are hot requred for excavatons less than or equal to 1 ft. n depth. (1) The mnmum number of excavaton floorsamples should be determned from Table 1., TABLE 1 '.. ",':'-Af~~t:Qf~~;86~:~f~~~~~!;W!(~~t~t~l~~H~'b&:f1d1~: j:m~:~'g~\~ X < $00 ~ X < 1, JOOO~X < 1, J500 ~ X < 2, ,1500~ X < 4, ,pOO ~ X <. 6, ,1000~ X < 8, ,SOO~ X < 10,000 8 (2) The mnmum number of excavaton sdewall samples should be determned from the table below. TABLE 2 Excavaton Sdewall Samples Total Lnear Ft. of-sdewalls Mnmum Number of Sam ples '. X < ~ X < boo ~ X < b00 ~ X < ~ X 8 Fact Sheet # /15/04 v.5." ġ ORGNAL

6 . ot f~ 1' ',t:; 1}). fft $.;" ;: ~:. Samples wll be based or collected from areas (or depths for sdewall samples) where the hghest concentratons would be expected based on prornvestgatons,vsblecontamnaton,or sol type/characterstcs. H. Sample locatonsncludngratonaleforselecton ofsample locatons shouldbe approvedn advancebydeq. v. To demonstrate complancewth cleanup levels, each sample result r s compared drectly to the cleanup level for each consttuent dentfed for remedaton. f cleanup levels are exceeded at any sngle locaton, addtonal excavaton wll be requred and addtonal sol confrmaton samples should be collected wthn the areas of addtonal excavaton untl complance wth the cleanup levels s attaned. b. Largle Stes: >10,000 sq. ft. of excavaton floor area. L The number and locatonof confrmaton sol samplesfor large stes should be determned by ste-spe9fc characterstcs, such as expected locatons of hghest contamnant concentratons, varablty of sol contamnaton, vsble; contamnaton, or sol type/characterstcs.-.. Use of a samplng grd s recommended to determne' sol sample locatons. A scaled square grd s supermposed onto a map of the remedated area (ncludng both ~dewalls and base). Some specfed pont (usually the southwest corner) s desgnated as the 0,0 coordnate. The grd s then adjusted, as necessary, to maxmze samplng coverage and to accommodate a mnmum of at least one sample per sdewall... H. A grd cell sze of 400 to 1000 sq. ft. wll be approprate for most large stes. The number of samples depends on grd dmensons and area of excavaton floor. v. f samplng grds are used for collecton of sol confrmaton samples, the samples wll be collected wthn each grd usng systematc samplng technques (sample collected at the center of each grd) or a random samplng approach (randomly-generated coordnates are determned usng a random number generator). Procedures for v. conductng samplng wthn grds are provded n Methods for Evaluatng the Attanment of qleanup Standards, Volume 1, Sols and Sold Meda (EPA 1989). To demonstrate complance wth ste cleanup levels, each sample result s drectly compared to the cleanup levels. Alternatvely, a statstcal approach can be used that allows one or more samples to exceed the cleanup level. The recommended statstcal approach uses the 95 percent upper confdence level (UCL) on the true populaton mean to demonstrate complance for a sngle, contguous. remedal area. Methodology for ths statstcal approach s provded n supplemental gudance to RAGS: Calculatng the Concentraton Term, Publcaton (EPA 1992). v.. f cleanup levels are exceeded, 'addtonal excavaton may be' requred untl crtera are attaned. The radus of excavaton around the sample exceedng the cleanup level s equal to the grd nterval. f addtonal excavaton s requred, addtonal sol confrmaton Fact Sheet # /15/04 v.5 ORGNAL

7 .., ': -.1, l'. ~ ; ~), r ~ 1; ~;) ~, ~[ r.,' v. samples should be collected wthn the areas of addtonal excavaton untl the cleanup levels are attaned. Alternatvely, addtonal sol samples may be collected to defne the extent of contamnaton where sol concentratons exceed the cleanup levels. f the boundares of contamnaton are defned wth addtonal samplng, DEQ wll consder use of these addtonal sol samples as confrmaton samples, as long as the sample results demonstrate complance wth cleanup levels. 2. Sample AndlYSs. Analytcal methods u~ed for sol confrmaton samples should be approprate'"'}or the contamnants dentfed for cleanup at the ste. The laboratory reportng llljlts should be set at levels equal to or less than the cleanup levels, unless other reportng lmts are approved by DE~. Laboratory methods and analyses shpuld be performed n accordance wth EPA or other standard methods [such as Te# Methods for EvaluatngSold Waste, S,W-846 (EPA 1986)] and usng approprate QNQC procedures. Generally,consttuents nsol wll be measuredon a total, dry-weghtbass. -. Qualty Ass~rance/Qualty Control. QNQC procedures n the feld and laboratory should be f<bllowed. General QNQC procedures for feld actvtes and laboratory analyses sh~uld be provded n the Sol Confrmaton Samplng Plan (see 4a below). At a mnmuln, the procedures - wll nclude the followng:. a. Datal qualty objectves wll be dentfed so that the types and quantty of data Fre obtaned n a manner such that the data are of known, approprate,. and suffcent qualty to support ther ntended use. - b. ProjJct data should be techncally sound, statstcally vald, and properly docuh1ented, havng been evaluated aganst EPA-establshed crtera for prec~on, accuracy, representatveness, completeness, and comparablty. c. Lab~ratOry reportng lmts for sample data should be set at levels less than or eqlual to the cleanup levels, unless other reportng lmts are approved by DEQf Laboratory reportng lmts may need to be lowered to meet cleanup levels. - d. FactSheet# /15/04 v.5 ORGNAL

8 .. "t ~.<~.".; t.,~ 1-, ~.; ~~. J~ j;! ' ~.;' ~. t;.1!. 1<: 4. e. v. v.. V.!... V. (3) Samples suffcent to run matrx spke/ matrx spke, as approprate. Feld nstruments wll be properly operated, calbrated, and mantaned by qualfedpersonnel accordng to the manufacturer's gudelnes and recommendatons. Sample handlng durng packagng and shpment should not result n cross-contamnaton or loss of contamnants (e.g., VOCs). Possesson or custody of samples should be traceable from the tme of collecton untl.the tme the sample s submtted to the laboratory...foranalyss., Custody means sample s secured to prevent tamperng, s placed n a d~sgnated, secured area, or the sample s. n actual physcal possesson of the sampler. Chan-of-custodyrecords are used to document the custody of the sample from collectonuntlsubmtt~d to the laboratory. Sample labels are used to accu~atelydocument the sample locaton, date/tme of collecton,and sam'ple analyses requested. La~oratory QAJQC procedures: '... The laboratory wllmantan sample ntegrty, securty, and custody.. Laboratory qualtycontrosamples should nclude, at a mnmum: (1) Laboratory method blanks. (2) Surrogate spkes, as approprate. (3) Laboratory matrx spke/matrx spke du'plcates, as approprate... (4) Laboratoryduplcates, as approprate. (5) Laboratorycontrolsamples, as approprate... Laboratory QC samples are generally analyzed at a frequency of lone n 20 samples, not ncludngqc samples. Document~ton. Sol confrmatonsamplng actvtesshould be documented and documentaton should be submtted to DEQ for revew and approval. The document~ nclude a Sol Confrmaton Samplng Plan,and Remedal Acton CompletofjlReport. " a. sol Confrmaton Samplng Plan. The Sol Confrmaton Samplng Plan may ether be provded to DEQ, as part of the remedy agreement or, for ndependent cleanup stes, as part of a proposal for ste nvestgaton and cleanup. DEQ encourages property owners to enter the Voluntary Remedaton Program and obtan DEQ approval pror to sol cleanup and confrmaton samplng. f sol cleanup and confrmaton samplng actvtes are completed pror.to DEQ approval, DEQ may requre addtonal work. The sol confrmaton samplng plan should nclude the followng, as approprate: (1) Planned sol removal area(s). A scaled map of the planned sol removal area(s) wth ntended locatons for sol (2) confrmaton samples dentfed. Sample locaton ratonale. Detaled nformaton should be provdedto explanthe ratonaleused to defnethe followng:"" (a) (b) Confrmaton sample locatons (wth sample grd, as approprate ). Sample depths. FactSheet# /15/04 v.5 ORGNAL

9 samplng.. " {' J, ", ~. H ~.~ n ft~y' ~;!;. ~~. t;'y ~,~~ ~;.. b. (3) (4) (c) Sample collecton procedures. (d) Any bases that wll or may be used for sample locaton selecton (e.g., dscolored sol, source area, etc.). (e) Descrpton of how sample number and locatons wll be modfed, f excavaton area s smaller or larger than expected. (f) Feld QA/QC. Sample analyss; The followng nformaton should be provded on the type of sample analyss to be used for the sol confrmaton samples: (a) Analytcal parameters. (b) Analytcal methods.. (c) Method reportng lmt goals. (d) Laboratory QA/QC.. :, Data evaluaton. The descrptpn of data evaluaton methods should nclude nformaton on the followng: (a) Cleanup levels.. (b) Evaluaton methods (e.g., drect comparson to cleanup levels, statstcal evaluatons). Strategy for determnng ffurther acton s necessary based on data results;. Remedal Acton Completon Report.. ' (c) Followng completon of a remedal aeton nvolvng excavaton and removal of contamnated sol, documentaton ofthe sol confrmaton! results s requred. The results should be provded wth the documentaton for completon of the remedal. acton. The! documentaton should nclude the followng, as approprate: (1) Scaled map of remedatonarea(s), sh.owngsample grd (f used) and sol confrmaton sample locatons. (2) Descrpton of confrmaton samplng, ncludng: (a) Confrmaton sample locatons (wth sample grd, as approprate)., (b) Sample depths. (c) Sample collecton procedures. (d) Ratonale for any modfcatons to confrmaton sample locatons from those specfed'n the Sol Confrmaton Samplng Plan. (3) Confrmaton sample results, ncludng: (a) Tables provdng analytcal parameters, methods, and analytcal results for each parameter. (b) Cleanup levels. (c) Descrpton of data evaluaton technque (drect compar~on to cleanup levels or statst.cal analyss). (d) Results of data evaluaton, ncludng any addtonal remedaton that was necessary because of exceedng cleanup levels. (e) Laboratory data sheets and data valdaton results. (4) Addtonal nformaton needed to support completon of remedy agreement requrements. Fact Sheet # /15/04 v.5 ORGNAL