ENVIRONMENTAL COMPANY OF SAO PAULO STATE – … · according to the guideline abnt nbr 15495-1 and...

ENVIRONMENTAL COMPANY OF SAO PAULO STATE – CETESB

REGIONAL CENTRE OF STOCKHOLM CONVENTION ON POPs FORLATIN AMERICA AND THE CARIBBEAN REGION

V INTERNATIONAL TRAINING PROGRAM ON ENVIRONMENTAL SOUND MANAGEMENT ON CHEMICALS AND WASTES, ESPECIALLY ON PERSISTENT

ORGANIC POLLUTANTS (POPs) AND MERCURY (Hg)

Assessment of Contaminated Areas - Detailed InvestigationEng. Maria Cecilia Pires

2016

Sao Paulo – SP – Brazil

OBJECTIVE

• IT IS TO QUANTIFY THE CONTAMINATION,DETERMINING THE DIMENSIONS OF THE AFFECTEDAREAS AND VOLUMES, TYPES AND CONCENTRATIONOF CONTAMINANTS. IN THE SAME WAY IT MUST BEDETERMINED THE CHARACTERISTICS OF THECONTAMINATION PLUMES, THEIER LIMITS ANDPROPAGATION RATES.

• THE CONCEPTUAL MODEL 2, RESULTING FROM THECONFIRMATORY INVESTIGATION IS USED AS BASIS FOR ITSDEVELOPMENT.

DETAILED INVESTIGATION

Detailed Ivestigation

Data collection

Hydrogeologicalchacarcterization

AC

AS

AP

Registro deACs

Plan of investigation

ConceptualModel 2

Caracterizationof the source ofcontamination

Mapping ofthe plum of

contamination

Monitoring Mathematicalmodeling

Interpretation of the results

ConceptualModel 3

RUA UM

RU

A D

OIS

RUA SEIS

RU

A T

RÊ

S RU

A C

INC

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RUA QUATRO

RU

A S

ETE

RUA SEIS

REPRESA

0.30.2

0.9

1.4

1.2

0.8

1.55

1.8

2.3

2.6 2.4

0.0

0.5

1.5

2.0

0.2

1.75

0.8

1.6

-0.7-0.6

-0.9

0.3

0.6

0.9

1.3

1.41.1

1.0

RESERVOIR

DETAILED INVESTIGATIONINFORMATION REQUIRED FOR THE INVESTIGATION PLANNING

• THE DEFINITION OF THE TECHNICAL AND SCIENTIFICCONCEPTS THAT MUST BE CONSIDERED.

• TO DEVELOP A SYSTEM FOR ORGANIZATION ANDMANAGEMENT OF THE DATA TO BE RAISED(SPREADSHEETS, DATABASES, ROTINE RECORDS OF THEREQUIRED AND OBTAINED INFORMATION).

• TO IDENTIFY THE TECHNICAL AND EXPERTS THAT AREREQUIRED FOR THE INVESTIGATION, GUIDELINES TO BEUSED, METHODS AND PROCEDURES TO BE ADOPTED IN THEFIELD AND ETC.


• TO SET HOW THE DATA COLLECTED IN FIELD WILL BEREGISTERED AND MANAGED (STANDARDISATION).

• TO KNOW WHICH ARE THE REQUIREMENTS OFREGULATORY AGENCIES.

• TO ESTABLISH CHEDULE TO BE ATTENDED.

• TO REASE THE AVAILABLE BUDGET.

• TO KNOW THE REQUIRED QUALITY CONTROL FOR THISSTAGE OF INVESTIGATION.

• TO HAVE A SAFETY PLAN.

• TO HAVE AN EMERGENCY PLAN.


• LIMITS OF INVESTIGATION

– CURRENT PROPERTY BOUNDARY

– PROPERTY LIMIT IN THE PAST

– CHARACTERISDTICS OF THE SITE (TOPOGRAPHY, SOIL, GEOLOGY, HYDROGEOLOGY, BIOTA)

DETAILED INVESTIGATIONSTEPS TO CARRY OUT

• TO DEVELOP A DETAILED PLAN OF THEINVESTIGATION AND SAMPLING OF THEENVIRONMETAL MEDIAS TO BE ASSESSED.

– METHODS OF SAMPLING– ANALYTICAL METHODS– SAMPLING PROTOCOLS– FIELD ANALYSIS– PROCEDURES TO ENSURE AND CONTROL

THE QUALITY OF WORK

Progresso do processo de uma liberação dehidrocarbonetos no solo, à partir de um vazamento

ocorrido em tanque subterrâneo

Produto emfase livre

Zona não saturada

Zona saturada

Franja Capilar Nível do aquífero freático

Camada confinante

Início do vazamento

Produto emfase livre

Nível do aquífero freático

Camada confinante

Fase dissolvida

Continuidade do vazamento

Zona saturada

Franja Capilar

Zona não saturada

Zona não saturada

Franja Capilar

Zona saturada

Fase dissolvidafaselivre

Camada confinante

Fonte primária eliminada

Solocontaminado

Nível do aquífero freático

LIKAGE OF HYDROCARBON FROM A UNDERGROUND TANKPROGRESS OF THE PROCESS OF HYDROCARBON RELEASE IN THE SOIL

UNSATURATED ZONE

FRINGE CAPILLARY

SATURATED ZONE

FREE PHASEPRODUCT

WATER TABLE LEVEL

CONFINED LAYER

THE BEGINNING OF LIKAGE

UNSATURATED ZONE

FRINGE CAPILLARY

SATURATED ZONE

FREE PHASEPRODUCT

WATER TABLE LEVEL

CONFINED LAYER

LEKAGE PROGRESS

DISSOLVED PHASE

UNSATURATED ZONE

SATURATED ZONE

FRINGE CAPILLARY

PRYMARY SOURCE OF CONTAMINATION

FREE PHASE

PRODUCTCONTAMINATED

SOIL

CONFINED LAYER

DISSOLVED PHASE

WATER TABLE LEVEL

DETAILED INVESTIGATIONDISTRIBUTION OF STAGES

• FREE PHASE

– THE PRODUCT IN SEPARATE PHASE (IMMISCIBLEOR PARTIALLY MISCIBLE) PRESENTS MOBILITYBETWEEN POROUS MEDIA, FLOWING TO THEINTERIOR OF THE MONITORING WELL.

– IT REPRESENTS A SOURCE OF CONTAMINATIONFOR GROUNDWATER.

– IT PRESENTS RISK OF EXPLOSION AND FIRE.


• RESIDUAL PHASE

– THE PRODUCT IN SEPARATE PHASE(IMMISCIBLE OR PARTIALLY MISCIBLE) DOESNOT PRESENT MOBILITY IN POROUS MEDIA ANDDOES NOT FLOW TO THE INTERIOR OF THEMONITORING WELL.

– IT REPRESENTS A SOURCE OF CONTAMINATIONTO GROUNDWATER.

– IT PRESENTS RISK OF EXPLOSION AND FIRE.


• VAPOR PHASE

– IT IS EMINENTLY PRESENT IN THE NONSATURATED ZONE AND IN VERY LOWQUANTITIES IN THE SATURATED ZONE.

– IT PRESENTS HIGH MOBILITY AND MAYACCUMULATE IN CONFINED SPACES.

– IT PRESENTS RISK OF EXPLOSION.


• DISSOLVED PHASE

– IT IS PRESENT IN THE SATURATED ZONE.

– IT PRESENTS HIGH MOBILITY AND ISRESPONSIBLE FOR THE TRANSPORT OFCONTAMINANTS FOR LONG DISTANCES OFTHE CONTAMINATION SOURCE.

– IT HAS GREAT IMPORTANCE BECAUSE THEGROUNDWATER HAS TO BE PROTECTED.


• ADSORBED PHASE

– THE PRODUCT IS RETAINED IN THE SOLIDPHASE OF THE AQUIFER.

– IT DOES NOT PRESENT MOBILITY.

– IT REPRESENTS A SOURCE OFCONTAMINATION FOR THE GROUNDWATER(IN A SCALE MUCH SMALLER THAN THEFREE AND RESIDUAL PHASES).


• PROPERTIES GOVERNING THIS DISTRIBUTION

– VAPOR PRESSURE (FREE AND RESIDUALPHASE TO STEAM PHASE AND VICE VERSA).

– SOLUBILITY (FREE AND RESIDUAL PHASE TODISSOLVED PHASE).

– HENRY'S LAW (DISSOLVED PHASE TO STEAMPHASE AND VICE VERSA).

– KD (DISSOLVED PHASE TO SOLID PHASE ANDVICE VERSA).

DETAILED INVESTIGATIONPROPERTIES OF THE ENVIRONMETAL MIDEA

• THE POROSITY AND PERMEABILITY ARE THETWO MOST IMPORTANT PROPERTIES RELATEDTO THE GEOLOGICAL MIDEA, THAT INFLUENCETHE MOVIMENT OF FLUIDS.

– THE POROSITY CHARACTERIZED THE ABILITYOF THE SOIL MEDIA TO STORE FLUIDS.

– THE PERMEABILITY CHARACTERIZED THEABILITY OF THE SOIL MIDEA TO TRANSPORTFLUIDS.

DETAILED INVESTIGATIONPROPERTIES OF THE MEAN

• THE PROPAGATION RATE OF PLUMES OF FREE PHASEPRODUCT AND DISSOLVED PHASE ARE DIRECTLY RELATED TOTHE PERMEABILITY OF THE SOIL.

• THE HYDRAULIC CONDUCTIVITY MEASURES THE ABILITY OFTHE GEOLOGICAL MEDIA TO TRANSMIT WATER. IT IS RELATEDNOT ONLY TO SOIL PCHARACTERISTICS BUT ALSO TO FLUIDPROPERTIES.

• THE INTRINSIC PERMEABILITY IS A PERMEABILITY MEASUREWHICH INDEPENDENTS OF THE FLUID NATURE.

DETAILED INVESTIGATIONDATA COLLECTION

• CHARACTERIZATION OF THE ENVIRONMENTAL MIDEA AND THE CONTAMINATION

– THE SURROUNDING AREA CHARACTERIZATION;– THE GEOLOGICAL/PEDOLOGICAL CHARACTERIZATION;– THE HYDROGEOLOGICAL CHARACTERIZATION.

• CHARACTERIZATION OF THE CONTAMINATION– TO CHARACTERIZE THE CONTAMINATION, IT SHOULD

BE DETERMINED THE CONCENTRATIONS ANDDISTRIBUTION OF THE CHEMICALS OF INTEREST (SQIS)AND SET THE LIMITS OF THE PLUME OFCONTAMINATION.

DETAILED INVESTIGATIONGEOLOGICAL/PEDAGOGICAL CHARACTERISTICS

• TO CARRY OUT DRILLING WELLS USING PROPERMETHODS FOR THE SOIL MIDEA AND TO COLLECT THEREQUIRED SAMPLES ;

• TO IDENTIFY AND TO DESCRIPT THE SOIL, SEDIMENT,ROCK AND/OR LANDFILL IN ACCORDING TO THERECOMMENDATIONS OF GUIDELINES, SUCH AS THEMANUAL OF DESCRIPTION AND COLLECTION OF SOIL INTHE FIELD, OF THE BRAZILIAN SOCIETY FOR SOILSCIENCE, AND OTHER DOCUMENTS APPLICABLE FORTHE ROCKS DESCRIPTION;

• TO DESIGNING THE PROFILE DRILLINGS PERFORMEDAND THE CONSTRUCTION OF TRANSVERSAL ANDLONGITUDINAL SECTIONS;

DETAILED INVESTIGATIONGEOLOGICAL/PEDAGOGICAL CHARACTERISTICS

• THE COLLECTION OF SAMPLES OF THE MATERIAL THATCOMPOSE THE REPRESENTATIVE LAYERS OF THESOIL/ROCK/SEDIMENT/LANDFILL FOR DETERMINING THESOIL GRANULOMETRY,TOTAL POROSITY AND EFFECTIVEPOROSITY;

• THE ESTABLISHMENT OF TABLES WITH THE RESULTS OFDETERMINATIONS MADE;

• THE PREPARATION OF EXPLANATORY TEXT WITH BRIEFDESCRIPTION OF THE ROCKS, SEDIMENTS, SOILS ANDLANDFILL FOUND ON THE SITE;

• TO DRAW UP A PLANT CONTAINING THE LOCATION OF THEDRILLING WELLS PERFORMED AND THE SAMPLING POINTS.

DETAILED INVESTIGATIONHYDROGEOLOGICAL CHARACTERIZATION

• INSTALLATION OF MONITORING WELLS, WHICH SHOUD BEBUILT UP ACCORDING TO THE ABNT NBR 15495-1 AND ABNTNBR 15495-2 BRAZILIAN GUIDELINES;

• INSTALLATION OF MULTILEVEL WELLS WITH THE FILTERSECTIONS OF THE DEEPER WELLS LOCATED IN THE LAYERSTHAT CONDITIONING THE FLOW, WITH THE PURPOSE OFDETERMINING THE EXISTENCE OF VERTICAL FLOW;

• DETERMINATION OF THE TOPOGRAPHIC COTA OF THESURFACE OF THE WELL AND WATER TABLE LEVELMEASUREMENT FOR THE CALCULATION OF THE HYDRAULICPOTENTIAL IN EACH MONITORING WELL. THE MEASURESMUST BE TAKEN IN THE SAME DATE, INCLUDING THEMULTILEVEL WELLS.


• TO DETERMINE THE HYDRAULIC CONDUCTIVITYOF ALL WELLS INSTALLED;

• TO DETERMINE THE GROUNDWATER SPEEDFLOW FOR EACH OF THE CONDITIONINGHYDROGEOLOGICAL UNITS OF TRANSPORT OFTHE SQIS;

• TO PREPARE A PLANT OF POTENTIOMETRICMAPS COVERING THE DETERMINED PLUMES OFCONTAMINATION;


• TO PREPARE A PLANT OF TRANSVERSAL ANDLONGITUDINAL SECTIONS RELATED TO THEMAIN AXIS OF THE MAPPED PLUMES INHORIZONTAL PLAN, CONTAINING THEREPRESENTION OF THE LOCAL GEOLOGY, THEPOTENTIOMETRIC LINES, THE CONSTRUCTIVEPROFILE OF DRILLING WELLS AND THEHYDRAULIC CONDUCTIVITY VALUES FOR THESOIL TESTED;

• EXPLANATORY TEXT WITH SUMMARY OFLOCAL HYDROGEOLOGY.

LONGITUDINAL SECTION

TRANSVERSAL SECTION

CONSTRUCTIVE PROFILES OF ALL THE MONITORING WELLS WITH DESCRIPTION OF THE LITHOLOGY THAT WERE CROSSED

LOCATION OF THE DRILLING AND

MONITORING WELLS

THE PLANT SHOUD BE DONE PREFERABLY PER INVESTIGATED SOIL STRATUM

EXEMPLE OF HYDROGEOLOGICAL CHARACTERISTICS

WELL DEPTHm

FILTER SECTION m

STABILIZED WATER TABLE

HYDRAULICLOAD

HYDRAULIC CONDUCTIVITY (m/s)

POTENTIOMETRIC MAP - PER INTEREST LAYER

DETAILED INVESTIGATIONMAPPING OF THE PLUMES OF CONTAMINATION

• THE MAPPING THE PLUMES OF CONTAMINATIONMUST CONTEMPLATE THE THREE-DIMENSIONALLIMITATION OF THE PLUMES FREE, DISSOLVEDAND RETAINED PHASES, AS WELL AS THE SPATIALDISTRIBUTION OF CONTAMINANTS INSIDE THEEXTENT OF THE DELIMITED PLUME.

• THE LIMITS OF CONTAMINATION PLUMES IN FREE,DISSOLVED AND RETAINED PHASES WILL BEDEFINED WHEN IT IS OBTAINED A SUFFICIENTNUMBER OF LIMIT POINTS FOR ITS CLOSURE.

DETAILED INVESTIGATIONANALYTICAL RESULTS

THE ANALYTICAL REPORTS OF SOIL,GROUNDWATER AND OTHER MATERIALSSAMPLES EVALUATED MUST BE PRESENTEDACCORDING TO THE GUIDELINE ISO - IEC 17025.

IT MUST BE IDENTIFIED THE AREA WHERE THESAMPLE WAS COLLECTED.

THE DATA SHEET SAMPLE COLLECTION AND BYTHE CHAIN OF CUSTODY MUST COME TOGETHERWITH THE ANALYTICAL REPORTS, DULYCOMPLETED AND SIGNED.

DETAILED INVESTIGATIONFREE PHASE

TO DELIMIT THE FREE PHASE PLUMES THEMONITORING WELLS MUST BE INSTALLEDACCORDING TO THE GUIDELINE ABNT NBR 15495-1AND ABNT NBR 15495-2, AND MUST BE INSTALLEDWITH FULL FILTERING SECTION, WITH MAXIMUMLENGTH OF 3,0 m , BEING THAT 1,0 m IN THE NONSATURATED ZONE AND 2 m IN THE SATURATED ZONE.

FREE PHASE PLUME

WATER TABLE LEVEL

H0 - Thickness of free phase apparent

Hr - Real product thickness in free phase

DTP - Depth of the free phase level in the monitoring well

Ha - Distance of the product in free phase in the formation until the water level

X - Difference of the water level in the well and in the formation

H0

Ha

Hr

• THE MAPPING OF THIS PLUME WILL BE HELD BY MEANS OF APROCESS OF TRIAL AND ERROR. THAT IS, THE LOCATION OF ANEW DRILLIG WELL WILL BE DETERMINED IN FUNCTION OFWHAT WAS PREVEOUSLY FOUND.

• IN THE DESIGN OF PLUMES, IT SHOULD BE CONSIDERED THATITS LIMIT IS LOCATED IN THE HALF OF AN IMAGINARY LINETHAT CONNECT A POINT WHERE CONTAMINATION WASDETECTED AND ANOTHER WHERE IT WAS NOT DETECTED.

• FREE PHASE PLUMES WITH REGULAR SHAPE (CIRCULAR ORELLIPTICAL), THE USEPA CONSIDERS THAT THE AREA OF THEREAL PLUME IS ABOUT 40% LARGER THAN THE ONE THAT WASDELIMITED.

DETAILED INVESTIGATION DELIMITATION OF THE FREE PHASE PLUME

• TO DELIMIT THE APPARENT FREE PHASE IN THE VERTICALPLAN IT MUST BE CONSIDERED THAT THE UPPER LIMITPOINT OF THE PLUME WILL BE OBTAINED IN THE HIGHERQUOTA OF THE FREE PHASE LEVEL MEASURED INMONITORING WELL AND THE LOWER LIMIT POINT WILL BE, INA CONSERVATIVE WAY, THE QUOTA OF THE WATER TABLELEVEL MEASURED IN THE MONITORING WELL.

• THE GRAPHIC REPRESENTATION CAN BE MADE BY MEANSOF SOFTWARES THAT ENABLE THE THREE DIMENSIONALVIEW OR THROUGH SECTIONS OF PRESENTATION.

DETAILED INVESTIGATIONDELIMITATION OF THE FREE PHASE PLUME

DETAILED INVESTIGATIONDELIMITATION OF THE FREE PHASE PLUME

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Tanque

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Tanq

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Bom

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BombaBombaBomba

Escritório

Residência

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Residência Residência

ComércioResidência Residência Residência Residência

Direção do fluxo da AS

OFFICE

OFFICE

RESIDENCERESIDENCERESIDENCERESIDENCE

RESIDENCERESIDENCERESIDENCE

RESIDENCE

RESIDENCERESIDENCE

RESIDENCE

RESIDENCE

RESIDENCE

RESIDENCE

RESIDENCE

RESIDENCE

PUM

P

TAN

K

TAN

KTANK

TANK

PUMPPUMPPUMP

MONITORING WELL FOR FREE PHASE DELITITATION

MONITORING WELL

FREE PHASELEVEL (m)

WATER TABLELEVEL (m)

FREE PHASE PLUME NON-

AQUEOUS PHASE LIQUIDS OR NAPLS

LONGITUDINAL SECTION

FREE PHASE PLUME NON-

AQUEOUS PHASE LIQUIDS OR NAPLS

DETAILED INVESTIGATIONRETAINED PHASE

THE MAPPING OF THE RETAINED PLUMA MUSTCONTEMPLATE THE DETERMINATION OF THE LIMITSOF THE PLUME. FOR THAT IT MUST BE COLLECTEDSOIL, SEDIMENT, ROCK OR LANDFILL SAMPLESACCORDING TO THE SAMPLING PROCEDURES SETBY CETESB IN THE GUIDELINE SAMPLINGPROCEDURES FOR IDENTIFYING ENVIRONMENTALLIABILITIES IN ESTABLISHMENTS WICH FUEL WITHUNDERGROUND STORAGE SYSTEM (SASC).

DETAILED INVESTIGATIONMONITORING NETWORK OF GROUND WATER

DESIGN AND INSTALLATION OF MONITORING WELL

– TO SELECT THE TARGETS ZONES OF INVESTIGATION

– TO DETERMINE THE LOCATION OF MONITORING WELLSBACKGROUND,DOWNSTREAM,PREFERENTIAL GROUNDWATER FLOWS ZONES


DESIGN AND INSTALLATION OF MONITORING WELL

– TO DETERMINE THE POSITION AND EXTENT OF FILTERSSUPERNATANT FREE PHASE (THICKNESS)VERTICAL FLOWPREFERENCIAL GROUNDWATER FLOW ZONES

– DESIGN AND INSTALLATION OF MONITORING WELLS

– TO SET THE DESIGN OF THE WELLS TO BE INSTALLED

– TO INSTALL AND DEVELOP THE MONITORING WELLS

– TO LOCATE THE MONITORING WELLS (TOPOGRAPHY)


AS A FUNCTION OF THE COMPLEXITY AND HETEROGENEITYIDENTIFIED IN THE SITE CAN NOT BE POSSIBLE THEINSTALLATION OF A MONITORING WELL NETWORK WHICH WILLEXPLAIN IN A PROPER WAY THE OBSERVED SCENARIO OFCONTAMINATION.SO, BEFORE THE INSTALLATION OF MONITORING WELLNETWORK, IS NECESSARY AN EXTENSIVE KNOWLEDGE OF THEAREA ABOUT:

– GEOLOGICAL AND HYDROGEOLOGICAL CHARACTERISTICS(PRESENCE OF PREFERENTIAL PATHS)

– NATURE AND CHARACTERISTICS OF POTENTIAL CONTAMINANTS– ANTHROPOGENIC INTERFERENCES


POSITIONING THE MONITORING WELLS IN THEDETAILED INVESTIGATION– UPSTREAM WELLS

• THE NUMBER MUST BE SUFFICIENT TO ASSESS THEQUALITY OF THE GROUND WATER UPSTREAM OF THEINVESTIGATED AREA.

– DOWNSTREAM WELLS

• THE NUMBER MUST TO SUFFICIENT TO DELIMIT THE CONTAMINATION PLUME IN ALL DIRECTIONS AND TO MONITOR ITS FLOW.

DETAILED INVESTIGATIONMONITORING NETWORK OF UNDERGROUND WATER

POSITIONING THE MONITORING WELLS IN THEDETAILED INVESTIGATION

THE NUMBER OF WELLS TO BE INSTALLED IS DEFINED CASE BYCASE, DEPENDING ON VARIOUS FACTORS SUCH AS THEHETEROGENEITY OF THE ENVIRONMENTAL MIDEA, PRESENCE, TYPEAND NUMBER OF PREFERENTIAL FLOW PATHWAYS (SAND/GRAVELLENS INTERCALATED WITH MATERIAL OF THINNER GRAIN SIZE,FRACTURE, And FRACTURES AND CHANNELS IN THE ROCKS), THETYPE OF EXISTING CONTAMINANT, EXISTENCE OR NOT OF NATURALINTERFERENCES THAT AFFECT THE FLOW DIRECTION ETC.



– TO AVOID TO LOCATE THE MONITORING WELLS IN AREASWITH LOCALIZED ELEVATION IN THE WATER LEVEL.

– TO CONSIDER THE SEASONAL AND DAILY CHANGES (TIDES)OF THE AQUIFER LEVEL THAT CHANGE THE FLOW DIRECTION.

– TO CONSIDER THE CHANGES IN THE FLOW DIRECTIONINDUCED BY MAN.



– TO CONSIDER THE EXISTENCE OF THE POSSIBILITY OF OTHERSOURCES OF CONTAMINATION LOCATED OUTSIDE THE AREA.

– TO EVALUATE CAREFULLY THE PREPARED POTENTIOMETRICMAP, WITH RESPECT TO POSSIBLE INTERFERENCES.


ANTHROPOGENIC INFLUENCES– THE PUMPING WELLS

• PUBLIC, PRIVATE WELLS

– THE INJECTION WELLS– THE ARTIFICIAL RECHARGES

• LEAK AGE IN PIPES

– THE DRAWDOWN OF THE AQUIFER• CONSTRUCTION, MINING, DIGS

–THE UNDERGROUND INTERFERENCE• SEWAGE NETWORK, AQUEDUCTS, STREAMS CHANNELED


POSITIONING THE FILTERING SECTION

– BETWEEN THE NON SATURATED AND SATURATEDZONE (LNAPLS)

– INSIDE THE FLOW ZONE OF THE GROUND WATER (DISSOLVED FASE)

– INSIDE THE PREFERENTIAL LAYERS OF FLOW(ZONES OF HIGH HYDRAULIC CONDUCTIVITY)


BETWEEN THE NOT SATURATED AND SATURATED ZONE(LNAPLS)

Lâmina de produtoem fase livre

Contato água/hidrocarboneto

Poço de monitoramento instaladocorretamente

Lâmina de produto em fase livre


Poço secob)

a)

Lâmina de produto em fase livre


a) Apenas água entra no poço

Fonte

THERE IS ONLY WATER IN THE MONITORING WELL

FREE PHASE PRODUCT LAYER

FREE PHASE PRODUCT LAYER

FREE PHASEPRODUCT LAYER

THE CONTACT OF HYDROCARBON/WATER

THE CONTAC OF HYROCARBON/WATER

DRY MONITORING WELL

THE CONTACT OF HYDROCARBON/WATER

PROPERLY INSTALLED MONITORING WELL


INSIDE THE FLOW ZONE OF THE UNDERGROUND WATER(DISSOLVED PHASE)



– FILTERING SECTION IN ONLY ONE DEPTH - SINGLEMONITORING WELL

• ABSENCE OF FREE PHASE PRODUCT;

• LITTLE OR NONE PROBABILITY OF THE EXISTENCE OFVERTICAL FLOW;

• PRESENCE OF A SINGLE LAYER OF PREFERENTIALFLOW;

• SIMPLE AND HOMOGENEOUS GEOLOGY.

DETAILED INVESTIGATION MONITORING NETWORK OF GROUND WATER


– FILTERING SECTION IN MORE THAN ONE DEPTH -MULTILEVEL WELL

• PRESENCE OF PRODUCT IN FREE PHASE;• HIGH PROBABILITY OF EXISTENCE OF VERTICAL

FLOW;• PRESENCE OF MULTIPLE SEPARATED LAYERS OF

HIGH HYDRAULIC CONDUCTIVITY;• HETEROGENEOUS GEOLOGY;

– VERY VARIABLE LITHOLOGY– MORE THAN ONE INTERCONNECTED AQUIFER– AQUIFER SUSPENDED

INVESTIGAÇÃO DETALHADADISSOLVED PHASE

THE MAPPING MUST CONTEMPLATE THE DETERMINATIONOF THE LIMITS OF THE PLUME.

THE MAPPING OF THE CONTAMINATION PLUME MUST BEUSE MONITORING WELLS AND MULTILEVEL WELLS, WHICHTHE INSTALLATION AND DEVELOPMENT MUST BEACCORDING TO THE BRAZILIAN GUIDELINES ABNT NBR15495-1 AND ABNT NBR 15495-2.

IT MUST BE AVOIDED THE INSTALLATION OF PART OF THEFILTERING SECTION OF THE MONITORING WELL IN A NONSATURATED ZONE. THE TOP OF THE FILTERING SECTIONMUST BE PLACED NEXT AND BELOW TO THE STABILIZEDLEVEL OF WATER (AROUND 25cm). THE FILTERING SECTIONMUST HAVE A MAXIMUM LENGTH OF 2 m, BEINGNECESSARY A SMALLER LENGTH FOR THE CASE OFMULTILEVEL WELLS.

DETAILED INVESTIGATIONDISSOLVED PHASE

THE LIMITATION OF THE CONTAMINATIONPLUMA IN DISSOLVED PHASE MUST BE SETFROM A SUFICIENT NUMBER OF LIMIT POINTSNECESSARY FOR ITS CLOSURE AND MUSTCONSIDERED AS THE LIMIT OF THE PLUMESTHE INTERVENTION VALUES (VI) DEFINED BYCETESB AND, IN THE ABSENCE OF VI TO APARTICULAR PARAMETER, THE DETECTIONLIMIT (LD).


TO PERFORM THE DELIMITATION OF THEDISSOLVED PHASE PLUME IN THE HORIZONTALPLAN MUST BE CONSIDERED THAT THE LIMITPOINT OF PLUME MUST BE LOCATED NEAR THESAMPLING POINT OF GROUND WATER THATPRESENTS CONCENTRATION OF THE SQIBELOW THAN VI, TO A QUARTER OF DISTANCEBETWEEN THIS AND OTHER SAMPLING POINTSTHAT PRESENT CONCENTRATION OF THE SQIGREATER THAN VI.


• THE DEPTHS OF THE FILTERS LEVELS OF MULTILEVELWELLS MUST BE ESTABLISHED AS FUNCTION OF THEINTERPRETATION OF THE HYDROGEOLOGICALCONCEPTUAL MODEL DEVELOPED FOR THE SITE, INWHICH MUST BE IDENTIFIED THE PREFERENTIAL FLOWLAYERS OF THE GROUND WATER.

• EACH MULTILEVEL SET MUST BE FORMED FOR, ATLEAST, ONE PAIR OF WELLS WITH FILTERING SECTIONINSTALLED IN TWO DIFFERENT DEPTHS.


• IN THE CASE OF BEING DETECTED CONCENTRATION OFTHE SQI ABOVE THE VI IN THE DEEPEST WELL MUST BEADDED ONE OR MORE LEVELS TO THE MULTILEVELWELL, IN ORDER TO PROVIDE PROPER DEFINITION OFTHE LOWER LIMIT OF THE DISSOLVED PLUME.

• IN THE DETERMINATION OF THE LIMITS OF THEDISSOLVED PLUME IN THE VERTICAL PLAN MUST BECONSIDERED THAT THE LIMIT POINT OF THE PLUMEMUST BE LOCATED IN HALF OF THE DISTANCE BETWEENTHE BASIS OF THE FILTERING SECTION OF THE WELLTHAT PRESENTS THE CONCENTRATION BELLOW VI ANDTHE BASIS OF THE FILTERING SECTION OF THEADJACENT WELL THAT PRESENTS CONCENTRATION OFSQI OVER VI.


• AFTER BEING ESTABLISHED THE LIMITS OF THEDISSOLVED PLUME MUST BE CHECKED THE DISTRIBUTIONOF THE CONTAMINATION INSIDE THOSE LIMITS, THROUGHTHE DENSIFICATION OF THE MONITORING WELL NETWORK,POSITIONING NEW WELL CLOSE TO THE PRIMARYSOURCES OF CONTAMINATION, AIMING THEIDENTIFICATION OF HOT SPOTS.

• IN CASES IN WHICH THE HIGHEST CONCENTRATIONS HAVEBEEN IDENTIFIED FAR FROM THE PRIMARY SOURCES, THEDENSIFICATION MUST BE HELD NEXT TO THESE POINTS.

• FROM THE DATA OBTAINED, THE REPRESENTATION OFTHE CONTAMINATION PLUMES IN GROUND WATER MUSTBE INDIVIDUAL FOR EACH SQI WHICH CONCENTRATIONSARE ABOVE THE VI.


THE COLECTION OF SAMPLES OF GROUND WATERMUST BE OBSERVED IN THE GUIDELINESCONTAINING THE PROCEDURES FOR THEIDENTIFICATION OF ENVIRONMENTAL LIABILITIES INESTABLISHMENTS WITH FUEL UNDERGROUNDSTORAGE SYSTEM (SASC), AND MUST BEOBSERVED A PERIOD OF NO LESS THAN 10 DAYSBETWEEN THE INSTALLATION AND DEVELOPMENTOF THE MONITORING WELLS AND THE SAMPLECOLLECTION.

Storage dischargetanks

Distributiontubingsupply

OperationWastes

Sparetion boxStorage of used oil

ResidentialCommercial/IndustrialWork workerRelevant Ecological Receptor

ResidentialCommercial/Industrial

RecreationalRelevant Ecological Receptor

Primary source Secondary source Routes of exposure ReceptorsTransport Mechanism

Subsuperficial soil

(> 1 meter)

Rain/Superficial

waterTransport

Superficial WaterRecreational use /Relevant habitat

Volatilizationand

atmosphericdispersion

GROUND WATER

(Drinkable)

AIRInhalation of

vaporsand Particulate

SOILDermal contact and ingestion

Superficial soil

(<1 meter) Wind erosion and atmospheric dispersion

Volatilizationand

Accumulationin closedspaces

NAPL Mobile

Dissolved plume

ground water

Leaching and transportfor A.S

Superficial soilsediments

superficial water

Non-aqueous phase

(NAPL)

Residential

CONCEPTUAL MODEL

ResidentialCommercial/IndustrialWork workerRelevant Ecological Receptor

DETAILED INVESTIGATION AND ACTION PLAN

SPECIFIC OBJECTIVES

• TO DEFINE THE EXTENT OF CONTAMINATION PLUMES;

• TO DETERMINE THE CONCENTRATION OF SUBSTANCES OF INTEREST;

• TO CHARACTERISY ENVIRONMENAL MIDEA;

• TO ASSESS THE NEED TO ADOPT INTERVENTION MEASURES;

• TO DETERMINE THE INTERVENTION MEASURES TO BE TAKEN;

• TO SET THE REMEDIATION GOALS TO BE ACHIEVED IN THE POINTS OFCOMPLIANCE (POC), AIMING AT THE REHABILITATION OF THE SITE FORTHE PROPOSED USE.

DETAILED INVESTIGATION“PROCEDURE FOR MANAGEMENT OF CONTAMINATED AREAS”

DETAILED INVESTIGATION

THE IMPLEMENTATION OF THE DETAILEDINVESTIGATION AND ACTION PLAN MUST HAVE ATECHNICAL RESPONSIBLE FOR PERFORMINGTHE FOLLOWING ACTIONS :

• TO GET TOGETHER AND TO ASSESS ALL THE EXISTINGDATA;

• TO PERFORM THE DATA COLLECTION FOR DETAILEDINVESTIGATION;

• TO PREPARE THE INTERVENTION PLAN;

• TO PRESENT THE RESULTS– DETAILED INVESTIGATION– INTERVENTION PLAN.

CETESB-ENVIRONMENTAL COMPANY OF SÃO PAULO STATE

REGIONAL CENTER OF THE STOCKHOLM CONVENTION

THANK YOU!MARIA CECILIA PIRES [email protected]

PROFESSOR FREDERICO HERMANN JR. AVENUE, 345 – SÃO PAULO - BRAZIL

www.cetesb.sp.gov.br PHONE.+5511.3133.3854

ENVIRONMENTAL COMPANY OF SAO PAULO STATE – … · according to the guideline abnt nbr 15495-1 and...

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