Underwater explosions (UNDEX) and a ship's vulnerability to them are problems of interest in early-stage ship design. A series of events occur sequentially in an UNDEX scenario in both the fluid and structural domains and these events happen over a wide range of time and spatial scales. Because of the complexity of the physics involved, it is a common practice to separate the description of UNDEX into early-time and late-time, and far-field and near-field. The research described in this dissertation is focused on the simulation of near-field and early-time UNDEX. It assembles a hybrid framework of algorithms to provide results while maintaining computational efficiency. These algorithms include Runge-Kutta, Discontinuous Galerkin, Level Set, Direct Ghost Fluid and Embedded Boundary methods. Computational fluid dynamics (CFD) solvers are developed using this framework of algorithms to demonstrate the computational methods and their ability to effectively and efficiently solve UNDEX problems. Contributions, made in the process of satisfying the objective of this research include: the derivation of eigenvectors of flux Jacobians and their application to the implementation of the slope limiter in the fluid discretization; the three-dimensional extension of Direct Ghost Fluid Method and its application to the multi-fluid treatment in UNDEX flows; the enforcement of an improved non-reflecting boundary condition and its application to UNDEX simulations; and an improvement to the projection-based embedded boundary method and its application to fluid-structure interaction simulations of UNDEX problems. / Doctor of Philosophy / Underwater explosions (UNDEX) and a ship's vulnerability to them are problems of interest in early-stage ship design. A series of events occur sequentially in an UNDEX scenario in both the fluid and structural domains and these events happen over a wide range of time and spatial scales. Because of the complexity of the physics involved, it is a common practice to separate the description of UNDEX into early-time and late-time, and far-field and near-field. The research described in this dissertation is focused on the simulation of near-field and early-time UNDEX. It assembles a hybrid framework of algorithms to provide results while maintaining computational efficiency. These algorithms include Runge-Kutta, Discontinuous Galerkin, Level Set, Direct Ghost Fluid and Embedded Boundary methods. Computational fluid dynamics (CFD) solvers are developed using this framework of algorithms to demonstrate these computational methods and their ability to effectively and efficiently solve UNDEX problems.

Cette recherche doctorale en histoire immédiate, s'inscrit dans une réflexion plus large sur l'étude de nouveaux conflits, la culture et l'emploi des forces armées françaises sur le terrain, en prenant l'exemple de son engagement en Afghanistan. Elle porte particulièrement sur l'emploi de l'arme du génie dont nous postulons à la grande importance de ses savoir-faire sur le terrain, en situation de contre-insurrection. / This doctoral research takes part on the study of the new conflicts, by taking the example of the French engineers in Afghanistan. We postulate for the big importance of these combat support units in situation of counterinsurgency.

<p>I dagens konfliktområden är förekomsten av minor och oexploderad ammunition(OXA) ett vanligt förekommande problem för civilbefolkning samt de militära enheter som arbetar i området för att skapa stabilitet och säkerhet. Den här uppsatsen avhandlar möjligheten att lösa eventuella problem som har att göra med förekomsten av minor och OXA i ett missionsområde utan tillgång till stödresurser i form av min- och ammunitionsröjningsteam. Uppsatsens syfte är att undersöka om det är möjligt att tillföra minröjningskompetens på gruppnivå utan att tappa ursprunglig kompetens och fokus från huvudtjänsten. Uppsatsen tar även upp vilken lägsta nivå av utbildning som krävs för att kunna röja mineringar och OXA, samt hur man når upp till det målet. Uppsatsens frågeställning har varit: Går det att inom ramen för Jägarbataljon 09 utbilda en soldat som besitter kompetensen att kunna identifiera och röja mineringar samt OXA? Om ja, vilken utrustning bör tillföras? Mina slutsatser är att det är praktiskt möjligt genom att tillföra en min- och amröjledare på bataljons nivå. Min- och amröjledaren kan i sin tur utbilda och ge soldaterna den reella kompetens som behövs på enbart fyra veckor, ca 130h stimmar. Utbildningen som krävs är grundkursen Minröjning Manuella Metoder(MMM). För att fullt ut kunna nyttja förmågan krävs det att gruppen tillförs viss ammunitionsröjningsutrustning, bland annat extra tänd- och sprängmedel. Effekten man vinner på tillförsel av minröjningskompetensen är kopplat mot förbandets förmåga till okonventionellt uppträdande samt möjligheterna att ta ytterligare steg innanför motståndarens beslutscykel.</p> / <p>In today’s conflict areas the remnants of war, mines and unexploded ordnance (UXO) is a common problem for the civilian population. These remnants also pose a great threat for the military units who work in the area to create peace, stability and security for the people. The purpose of this essay is to discover if and how it is possible to solve eventual problems associated with remnants of war in conflict areas, without the support of Explosive Ordnance Disposal (EOD) teams. My research has explored if it is possible to implement mine clearance and ammunition disposal on a squad without loosing additional competence and focus from the squad’s main field of service. Additional research has been carried out to ascertain the lowest level of competence necessary to work within the field of mine clearance and ammunition disposal, and what education is needed. My thesis aims to answer, if it is possible within the frame of the Army Ranger Battalion 09, to educate a soldier on a squad to have the ability and competence to do work within the field of mine clearance and ammunition disposal? If yes, what additional equipment should be added to the squad, to be able to perform that task? My conclusion is that it is possible to achieve by adding a mine clearance and ammunition disposal leader to the Battalion staff who can educate, train and give the soldiers the proper education in four weeks (approximately 130h). The education required to achieve this goal is the course, Mine clearance Manuel Methods (MMM). To use this ability it is necessary to equip the group with some additional and specific disposal-equipment (i.e. extra explosives.) The main effort gained from implementing this ability on a ranger squad is the Ranger Battalion’s overall ability to operate and appear in unexpected areas, and to get inside the enemy’s OODA-LOOP.</p>

I dagens konfliktområden är förekomsten av minor och oexploderad ammunition(OXA) ett vanligt förekommande problem för civilbefolkning samt de militära enheter som arbetar i området för att skapa stabilitet och säkerhet. Den här uppsatsen avhandlar möjligheten att lösa eventuella problem som har att göra med förekomsten av minor och OXA i ett missionsområde utan tillgång till stödresurser i form av min- och ammunitionsröjningsteam. Uppsatsens syfte är att undersöka om det är möjligt att tillföra minröjningskompetens på gruppnivå utan att tappa ursprunglig kompetens och fokus från huvudtjänsten. Uppsatsen tar även upp vilken lägsta nivå av utbildning som krävs för att kunna röja mineringar och OXA, samt hur man når upp till det målet. Uppsatsens frågeställning har varit: Går det att inom ramen för Jägarbataljon 09 utbilda en soldat som besitter kompetensen att kunna identifiera och röja mineringar samt OXA? Om ja, vilken utrustning bör tillföras? Mina slutsatser är att det är praktiskt möjligt genom att tillföra en min- och amröjledare på bataljons nivå. Min- och amröjledaren kan i sin tur utbilda och ge soldaterna den reella kompetens som behövs på enbart fyra veckor, ca 130h stimmar. Utbildningen som krävs är grundkursen Minröjning Manuella Metoder(MMM). För att fullt ut kunna nyttja förmågan krävs det att gruppen tillförs viss ammunitionsröjningsutrustning, bland annat extra tänd- och sprängmedel. Effekten man vinner på tillförsel av minröjningskompetensen är kopplat mot förbandets förmåga till okonventionellt uppträdande samt möjligheterna att ta ytterligare steg innanför motståndarens beslutscykel. / In today’s conflict areas the remnants of war, mines and unexploded ordnance (UXO) is a common problem for the civilian population. These remnants also pose a great threat for the military units who work in the area to create peace, stability and security for the people. The purpose of this essay is to discover if and how it is possible to solve eventual problems associated with remnants of war in conflict areas, without the support of Explosive Ordnance Disposal (EOD) teams. My research has explored if it is possible to implement mine clearance and ammunition disposal on a squad without loosing additional competence and focus from the squad’s main field of service. Additional research has been carried out to ascertain the lowest level of competence necessary to work within the field of mine clearance and ammunition disposal, and what education is needed. My thesis aims to answer, if it is possible within the frame of the Army Ranger Battalion 09, to educate a soldier on a squad to have the ability and competence to do work within the field of mine clearance and ammunition disposal? If yes, what additional equipment should be added to the squad, to be able to perform that task? My conclusion is that it is possible to achieve by adding a mine clearance and ammunition disposal leader to the Battalion staff who can educate, train and give the soldiers the proper education in four weeks (approximately 130h). The education required to achieve this goal is the course, Mine clearance Manuel Methods (MMM). To use this ability it is necessary to equip the group with some additional and specific disposal-equipment (i.e. extra explosives.) The main effort gained from implementing this ability on a ranger squad is the Ranger Battalion’s overall ability to operate and appear in unexpected areas, and to get inside the enemy’s OODA-LOOP.

In the last few years, considerable efforts have been given to develop sensitive and effective sensors for explosive materials and to generate systems which exhibit high luminescence in both solution and solid-state. The increasing number of terrorist activities around the world have prompted scientists to design effective ways to detect and disarm even the trace amount of explosives. The nitroaromatics (NACs) are the common constituents of most of the explosives due to high explosive velocity and ease of availability. The NACs were extensively used as the main constituents in landmines until World War II. Apart from their explosive behavior, the NACs are well-known environmental pollutants. The industrial waste and the leakages from unexploded landmines are the major contributors towards the soil and ground water contamination. Presently for effective detection of trace amount of explosives, skilled canines and metal based detectors are commonly used. The canines are trained for a specific type of explosives which limit their ability to detect different types of substrates. The chemical sensors that work on the principle of colorimetric and/or fluorimetric detection techniques have emerged as suitable alternative due to cheap production cost, portability and sensitivity. Different types of materials including conjugated polymers, metal-organic frameworks (MOFs), and quantum-dots have been reported as efficient chemosensors for NACs. However, poor solubility in the common organic solvents, low solid-state fluorescence, very high molecular weight and lack of signal amplification have restricted the application of these material for in-field testing. Renewed interests have been invested in small molecule based systems; and metal-organic discrete molecular architectures due to precise control over their photophysical properties and the supramolecular interaction among neighboring molecules that facilitates energy migration among the molecular backbone. On the other hand, recently post-synthetic modification of different molecular systems including MOFs and polymers has emerged as a potential technique to incorporate desired functional groups into the system and to tune their properties with the retention of basic structures. Reports on the post-synthetic modification of discrete metal-organic architectures are rare due to the delicate nature of the metal-organic bonds that ruptures on mild environmental changes. Therefore, post-synthetic functionalization of discrete molecular systems using mild reaction conditions will open up a myriad of possibilities to generate new systems with desired characteristics. Chapter 1 of the thesis will briefly discuss the history of different explosive materials including different detection methodologies that are widely used. It will also include a brief discussion on different small molecular systems with high solid-state luminescence. In Chapter 2, design and synthesis of triphenylamine-based two Platinum(Pt)(II) molecules functionalized with carboxylic acid and ester groups including their organic analogues have been discussed. The triphenylamine core was chosen due its unique non-planarity and luminescence. On the other hand, Pt(II) center was incorporated to increase intermolecular spacing in solid-state that can induce high luminescence. Scheme 1. Schematic representation of fluorescence quenching using small molecules. All the four molecules were found to be highly sensitive towards NACs including picric acid and dinitrophenol. Although the molecules exhibited similar sensitivity in solution, the carboxylic acid analogues demonstrated superior sensitivity in solid-state. Careful observation of the crystal structures of the systems revealed the acid analogues were oriented in a 2-D grid-like pattern that facilitated energy migration among neighboring molecules (Scheme 1.). Chapter 3 describes design, synthesis, and NACs sensing behavior of anthracene-based four purely organic small molecules. The molecules exhibited high selectivity towards picric acid only. All the molecules were found to be highly emissive in both solution and solid-state due to the vinylanthracene backbone (Scheme 2.). Scheme 2. Schematic representation of fluorescence quenching and solid-state sensing behavior. Chapter 4 discusses the strategy to develop mechano-fluorochromic and AIE active triphenylamine-based Pt(II) complex and its organic analogue. The twisted triphenylamine backbone restricted molecular close packing in solid-state; and weak C-H-- interactions were utilized to hinder the motion of the phenyl rings. As a result, the molecules were highly emissive in solid-state. Grinding disrupted the intermolecular interactions and thus mechano-fluorochromic behavior was observed. Due to twisted backbone, the molecules were also found to be AIE active. Both the systems containing terminal aldehyde groups were finally utilized for selective detection of biomolecule cysteine (Scheme 3.). Scheme 3. Mechano-fluorochromic and AIE behavior of the triphenylamine based Pt(II) complex. In Chapter 5 vinylanthracene-based linear donor was used in combination with carbazole-based 90° and triphenylamine-based 120° Pt(II) acceptors to generate (4+4) and (6+6) molecular squares and hexagons, respectively. The vinylanthracene backbone imparts high solution and solid-state luminescence to the system as well as made them AIE active. The molecules were further investigated for the solution and solid-state sensing for NACs and found to be effective for trinitrotoluene (TNT) and dinitrotoluene (DNT) (Scheme 4.). Scheme 4. Schematic representation of AIE active molecular square and its NACs sensing. Chapter 6 describes the formation of Pd3 self-assembled molecular trinuclear barrels containing triphenylamine imidazole donors and Pd(II) acceptors. Using Knoevenagel condensation the aldehyde group present in the barrel was post-synthetically functionalized with Meldrum’s acid. From spectroscopic characterization, it was proved that the structural integrity remained intact after the post-modification treatment (Scheme 6.). Surprisingly, pre-synthetic modification of the donor alone with Meldrum’s acid followed by self-assembly treatment with the Pd(II) ion did not yield trigonal barrel 6.8. Scheme 6. Post-synthetic functionalization of trinuclear barrels using Knoevenagel condensation.(For colour pictures pl see the abstract pdf file)

Lower body explosive power (LBEP) forms a critical component in any individual and team sport performance and it is therefore essential to develop a means of predicting LBEP in adolescents for early identification of future talent in various sporting codes. LBEP is frequently used by athletes during matches or competitions where explosive movements such as jumping, agility running and sprinting are required for successful performance. These movements are usually found in individual sports such as long jump and high jump as well as in team sports such as basketball, volleyball and soccer. To date not much literature is available on LBEP, especially with regard to LBEP prediction models. Furthermore, studies on adolescents are scarce and a LBEP prediction model has not yet been developed for a South African adolescent population. It is against this background that the objectives of this study were firstly, to develop a LBEP prediction model from various physical and motor performance components among a cohort of adolescents living in the Tlokwe local municipality of Dr Kenneth Kaunda district in the North-West Province, South Africa; and secondly, to develop a LBEP prediction model from several anthropometric measurements among a cohort of male and female adolescents living in the Tlokwe local municipality of Dr Kenneth Kaunda district in the North-West Province, South Africa. Two hundred and fourteen (15.8±0.68 years) 15-year-old adolescents (126 females, 88 males) from 6 surrounding schools within the Tlokwe local municipality of Dr Kenneth Kaunda district in the North-West Province of South Africa were purposefully selected from pre-acquired class lists took part in the study. Data was collected by means of various questionnaires as well as anthropometrical, physical and motor performance tests. For representation of LBEP a principal component factor analysis was done and the results indicated that the vertical jump test (VJT) was the best indicator of LBEP in the cohort of adolescents. With regard to the anthropometrical related LBEP prediction model, the forward stepwise regression analysis yielded a correlation coefficient of R2 = 0.69. The following variables contributed significantly (p≤0.001) to the anthropometrical LBEP prediction model: stature (57%), muscle mass percentage (10%) and maturity age (3%). The LBEP prediction model that was developed equated to LBEP (vertical jump) = -136.30 + 0.84(stature) + 0.7(muscle mass percentage) + 4.6(maturity age). Variables other than the variables that formed part of the study could explain the further 31% variance in the LBEP of the adolescents. The physical and motor performance LBEP prediction model indicated that gender (39%) and 10 m speed (7%) contributed significantly (p ≤ 0.001) to the overall prediction of the LBEP of the adolescents. The LBEP prediction model delivered a stepwise forward regression analysis coefficient of R2=0.458 and a prediction formula LBEP = 68.21 + 9.82 (gender) – 18.33(10 m speed). The remaining 56% of the variance in the results could be explained by other factors than the variables considered in the study. In conclusion, to the best of the researchers’ knowledge, this is the first study which has made an attempt at developing LBEP prediction models from the anthropometrical, physical and motor performance components of a cohort of adolescents of South Africa. The prediction models developed in the study will assist teachers sport scientists and sporting coaches who have limited resources available, to measure and calculate LBEP in adolescents, with the means to do so in South Africa. Further high quality studies are necessary to further improve and develop such prediction models for various age groups of adolescents in the greater South Africa. / MSc (Sport Science), North-West University, Potchefstroom Campus, 2014

Lower body explosive power (LBEP) forms a critical component in any individual and team sport performance and it is therefore essential to develop a means of predicting LBEP in adolescents for early identification of future talent in various sporting codes. LBEP is frequently used by athletes during matches or competitions where explosive movements such as jumping, agility running and sprinting are required for successful performance. These movements are usually found in individual sports such as long jump and high jump as well as in team sports such as basketball, volleyball and soccer. To date not much literature is available on LBEP, especially with regard to LBEP prediction models. Furthermore, studies on adolescents are scarce and a LBEP prediction model has not yet been developed for a South African adolescent population. It is against this background that the objectives of this study were firstly, to develop a LBEP prediction model from various physical and motor performance components among a cohort of adolescents living in the Tlokwe local municipality of Dr Kenneth Kaunda district in the North-West Province, South Africa; and secondly, to develop a LBEP prediction model from several anthropometric measurements among a cohort of male and female adolescents living in the Tlokwe local municipality of Dr Kenneth Kaunda district in the North-West Province, South Africa. Two hundred and fourteen (15.8±0.68 years) 15-year-old adolescents (126 females, 88 males) from 6 surrounding schools within the Tlokwe local municipality of Dr Kenneth Kaunda district in the North-West Province of South Africa were purposefully selected from pre-acquired class lists took part in the study. Data was collected by means of various questionnaires as well as anthropometrical, physical and motor performance tests. For representation of LBEP a principal component factor analysis was done and the results indicated that the vertical jump test (VJT) was the best indicator of LBEP in the cohort of adolescents. With regard to the anthropometrical related LBEP prediction model, the forward stepwise regression analysis yielded a correlation coefficient of R2 = 0.69. The following variables contributed significantly (p≤0.001) to the anthropometrical LBEP prediction model: stature (57%), muscle mass percentage (10%) and maturity age (3%). The LBEP prediction model that was developed equated to LBEP (vertical jump) = -136.30 + 0.84(stature) + 0.7(muscle mass percentage) + 4.6(maturity age). Variables other than the variables that formed part of the study could explain the further 31% variance in the LBEP of the adolescents. The physical and motor performance LBEP prediction model indicated that gender (39%) and 10 m speed (7%) contributed significantly (p ≤ 0.001) to the overall prediction of the LBEP of the adolescents. The LBEP prediction model delivered a stepwise forward regression analysis coefficient of R2=0.458 and a prediction formula LBEP = 68.21 + 9.82 (gender) – 18.33(10 m speed). The remaining 56% of the variance in the results could be explained by other factors than the variables considered in the study. In conclusion, to the best of the researchers’ knowledge, this is the first study which has made an attempt at developing LBEP prediction models from the anthropometrical, physical and motor performance components of a cohort of adolescents of South Africa. The prediction models developed in the study will assist teachers sport scientists and sporting coaches who have limited resources available, to measure and calculate LBEP in adolescents, with the means to do so in South Africa. Further high quality studies are necessary to further improve and develop such prediction models for various age groups of adolescents in the greater South Africa. / MSc (Sport Science), North-West University, Potchefstroom Campus, 2014

我們提供一個新的可靠度模型，DwACM，並提供一個模式選擇準則CCP，我們利用DwACM和CCP來選擇衰變量。 / We propose a new reliability model, DwACM (Dichotomous-data with Auxiliary Continuous Measurements model) to describe a data set which consists of classical dichotomous response (Go or No Go) associated with a set of continuous auxiliary measurement. In this model, the lifetime of each individual is considered as a latent variable. Given the value of the latent variable, the dichotomous response is either 0 or 1 depending on if it fails or not at the measuring time. The continuous measurement can be regarded as observations of an underlying possible degradation candidate of which descending process is a function of the lifetime. Under the assumption that the failure of products is defined as the time at which the continuous measurement reaches a threshold, these two measurements can be linked in the proposed model. Statistical inference under this model are both in frequentist and Bayesian frameworks. To evaluate the continuous measurements, we provide a criterion, CCP (correct classification probability), to select the best degradation measurement. We also report our simulation studies of the performances of parameters estimators and CCP.

O presente trabalho teve por objetivo apresentar e discutir um caso de identificação e remediação emergencial de compostos orgânicos voláteis, oclusos em camada arenosa do Terciário da Formação São Paulo, em decorrência do vazamento de tanques de combustíveis de um posto de serviços. A técnica de remediação adotada para o caso consistiu na extração in situ dos vapores do solo e no tratamento dos mesmos por adsorção em filtros de carvão ativado (SVE - soil vapor extraction). Os processos de seleção, projeto, implantação, operação e descomissionamento da tecnologia SVE seguiram as metodologias indicadas pela literatura, adaptadas às condições locais. O acompanhamento da eficiência da remediação foi baseado na quantificação inicial dos hidrocarbonetos totais de petróleo leves presentes no subsolo, através das técnicas de cromatografia gasosa e espectrometria de massa, e na medição em campo das concentrações de voláteis e dos respectivos teores de explosividade. O resultado da campanha laboratorial apresentou fortes indícios de que a contaminação local fosse proveniente do combustível gasolina e indicou a ocorrência do composto benzeno em concentrações superiores aos limites adotados como referência. As leituras realizadas em campo mostraram rápido declínio das concentrações de voláteis e dos teores de explosividade com a operação da tecnologia SVE, indicando baixa ocorrência de fatores limitantes do transporte de massa no local. Corroborou com tal hipótese, o fato das metas de remediação terem sido atingidas com poucas trocas de ar, parâmetro retro-analisado a partir de dados de ensaios geológico-geotécnicos. Assim, concluiu-se que, para áreas com características semelhantes à estudada, a tecnologia SVE pode ser eficiente como medida de remediação de voláteis e redução dos riscos de explosividade. / This work aims to present and to discuss a case study of identification and emergency remediation of volatile organic compounds, occluded in a sand layer of the São Paulo Tertiary Formation, as a result of the leakage of fuel tanks of a service station. The adopted remediation technique was in situ soil vapor extraction (SVE) and offgas treatment for adsorption in activated carbon filters. Selection, design, commissioning, operation and shutdown processes of SVE technology followed literature methodologies, which were adapted to local conditions. Remediation efficiency monitoring was based on the initial quantification of light total petroleum hydrocarbons in the subsoil, through gas chromatography and mass spectrometry techniques, and on measurement of the volatile concentrations and respective explosive contents in the field. The result of the laboratorial campaign presented strong indications that the local contamination proceeded from combustible gasoline and it indicated the occurrence of benzene in concentrations higher than the adopted reference. Field measurements showed fast decline of the volatile concentrations and explosive contents with the SVE technology operation, fact that indicated low occurrence of mass transfer limitations in the place. The fact that remediation goals were achieved with few air exchanges, parameter back-analyzed from geologicgeotechnical tests, contributed to reinforce such hypothesis. Thus, SVE technique can be considered efficient for volatile remediation and explosive risks reduction, for areas with characteristics similar to the studied one.

O presente trabalho teve por objetivo apresentar e discutir um caso de identificação e remediação emergencial de compostos orgânicos voláteis, oclusos em camada arenosa do Terciário da Formação São Paulo, em decorrência do vazamento de tanques de combustíveis de um posto de serviços. A técnica de remediação adotada para o caso consistiu na extração in situ dos vapores do solo e no tratamento dos mesmos por adsorção em filtros de carvão ativado (SVE - soil vapor extraction). Os processos de seleção, projeto, implantação, operação e descomissionamento da tecnologia SVE seguiram as metodologias indicadas pela literatura, adaptadas às condições locais. O acompanhamento da eficiência da remediação foi baseado na quantificação inicial dos hidrocarbonetos totais de petróleo leves presentes no subsolo, através das técnicas de cromatografia gasosa e espectrometria de massa, e na medição em campo das concentrações de voláteis e dos respectivos teores de explosividade. O resultado da campanha laboratorial apresentou fortes indícios de que a contaminação local fosse proveniente do combustível gasolina e indicou a ocorrência do composto benzeno em concentrações superiores aos limites adotados como referência. As leituras realizadas em campo mostraram rápido declínio das concentrações de voláteis e dos teores de explosividade com a operação da tecnologia SVE, indicando baixa ocorrência de fatores limitantes do transporte de massa no local. Corroborou com tal hipótese, o fato das metas de remediação terem sido atingidas com poucas trocas de ar, parâmetro retro-analisado a partir de dados de ensaios geológico-geotécnicos. Assim, concluiu-se que, para áreas com características semelhantes à estudada, a tecnologia SVE pode ser eficiente como medida de remediação de voláteis e redução dos riscos de explosividade. / This work aims to present and to discuss a case study of identification and emergency remediation of volatile organic compounds, occluded in a sand layer of the São Paulo Tertiary Formation, as a result of the leakage of fuel tanks of a service station. The adopted remediation technique was in situ soil vapor extraction (SVE) and offgas treatment for adsorption in activated carbon filters. Selection, design, commissioning, operation and shutdown processes of SVE technology followed literature methodologies, which were adapted to local conditions. Remediation efficiency monitoring was based on the initial quantification of light total petroleum hydrocarbons in the subsoil, through gas chromatography and mass spectrometry techniques, and on measurement of the volatile concentrations and respective explosive contents in the field. The result of the laboratorial campaign presented strong indications that the local contamination proceeded from combustible gasoline and it indicated the occurrence of benzene in concentrations higher than the adopted reference. Field measurements showed fast decline of the volatile concentrations and explosive contents with the SVE technology operation, fact that indicated low occurrence of mass transfer limitations in the place. The fact that remediation goals were achieved with few air exchanges, parameter back-analyzed from geologicgeotechnical tests, contributed to reinforce such hypothesis. Thus, SVE technique can be considered efficient for volatile remediation and explosive risks reduction, for areas with characteristics similar to the studied one.