In: Singh D., Galaa A. (eds) Contemporary Issues In Geoenvironmental Engineering. GeoMEast 2017. Sustainable Civil Infrastructures. Springer, Cham

 Conference

 In-Situ Chemical Oxidation Of Hydrocarbon Contaminated Groundwater (A Case Study Of Baruwa Community, Lagos, Nigeria).

 Ola S.A., Fadugba O.G., Uduebor M.A.

 2018

A chemical oxidation of hydrocarbon contaminated site is attempted by using potassium permanganate (KMnO4) through injection into five hand dug wells within a pilot test area one hectare. The aim is to improve the quality of groundwater by degrading the soluble organic materials for further treatment and polishing, while incorporating bioremediation. The Background characterisations of groundwater and contaminant studied have been previously carried out (Adekunte 2008; Balogun 2009). 50 g/litre of potassium permanganate (KMnO4) was used as oxidant for the remediation of the Total Petroleum Hydrocarbons (TPH) in the pilot test area, the delivery of oxidant was done by gravity feed to the monitoring wells up to a height of 600 mm (2 ft) above water levels. Oxidation study was carried out by observing the TPH for and other parameters during the process of In-situ Chemical Oxidation (ISCO) remediation for 30 weeks. A reduction in Total Petroleum Hydrocarbons (TPH) ranging from 92.28% to 99.86% was observed within the period. The maximum TPH value of 512 ppm was observed at well W53, while the minimum observed TPH at the end of thirty weeks was 0.7 ppm at the same well. 

 Electronic Journal Of Geotechnical Engineering (EJGE)

 Journal

 Hydrocarbon Remediation By Natural Attenuation At Baruwa, Lagos Nigeria.

 Uduebor M.A., Ola S. A.

 2016

This research is concerned with characterization and assessment of Natural Attenuation of hydrocarbon contaminated site. The specific study site is Baruwa community in Alimosho Local government area of Lagos state, Nigeria, with a population of over 100,000 people. There are over 150 wells within the community which have been affected by the oil pollution which dates back to 1994, when there was a burst in an N.N.P.C (Nigerian National Petroleum Corporation) Valve pit located at the Federal Housing Estate (Jakande Estate) opposite the study site. Earlier studies carried out by Adekunte (2008) and Balogun (2009) have established a case of the pollution of the groundwater via hydro-chemical analysis and geoenvironmental assessment coupled with stratigraphic characterisation of the contaminated site using wells within the area respectively. This study employed the collection of field data in 2014 from the contaminated site to sufficiently characterize the hydrocarbon contamination within the area. Characterization of the study area was conducted utilizing the methodology prescribed by United States Environmental Protection Agency (USEPA, 2001). 25 Hand dug wells to a depth of 26.5 metres within the area were utilized for the study. Water levels and Free Hydrocarbon Thicknesses were measured with the aid of an oil/water interface meter, Total Petroleum Hydrocarbon (TPH) was also measured both in groundwater and soil vapour using a portable Hydrocarbon Analyser. Comparisons were made with data obtained in 2006 of previous studies and Natural Attenuation occurrence established based on Tiers 1 and 2 criteria (USEPA, 1999). LNAPL thickness decreases of 86.4% to 99.7% were recorded in comparison with that from previous studies (2006 - 2014). TPH surveys carried out in the groundwater are in agreement with LNAPL flow direction. Decreases in TPH concentrations varying from 33.13% to 57.61% were observed in comparison with earlier studies (2006 - 2014). All the wells investigated within the study area indicated that significant Natural Attenuation has occurred over the period (2006 - 2014). 

 Journal Of Environment And Natural Resources Research. Canadian Center Of Science And Education.

 Journal

 Slug Tests For Determination Of Hydraulic Conductivity Of Contaminated Wells.

 Ola S. A., Fadugba O. G., Uduebor M. A.

 2016

This paper reviews three models for analyzing slug test data to determine hydraulic conductivity of hydrocarbon contaminated wells in the study area. 50 grams/litre potassium permanganate (KMnO4) was used as permeating fluid for the remediation of the site. Data of the slug-in test from five (5) observation wells varying in diameter from 0.82-1.93m in the study area in Baruwa, Lagos Nigeria were analyzed with three models used in the study, namely; Hvorslev, Ferris –Knowles and Earth Manual models. Analysis of the data showed that all three analytical methods produced similar range of magnitude of the order of 10-4cm/sec values of hydraulic conductivity. 

 4th GeoChina International Conference 2016.

 Conference

 Hydraulic Conductivity Of Partially Saturated Semi-Arid Tropical Black Clay From Consolidation Tests.

 Adeyeri J.B., Ojuri O.O., Uduebor M.A.

 2016

Oedometer and suction tests were performed in the laboratory on samples of black cotton soil of North-Eastern Nigeria compacted by static compaction to various degrees of saturation and moisture content to determine the compressibility and hydraulic conductivity characteristics at different states of stress in the pore-water. The goal is the evaluation of pavement performance and hydraulic barrier behaviour of semi-arid/arid soils under varied soil moisture and applied stress conditions. From the results, the basic index properties of the black cotton soil such as fines content, plasticity index, clay activity and predominant clay mineral were discussed against the backdrop of the pollution barrier potential of this tropical black clay. Soil suction decreased from 5.2 pF at 20% saturation to 1.8 pF at 100% saturation. Soil suction has been identified as a major factor controlling the expansive nature of black cotton soil i.e swelling- shrinkage properties. The coefficient of consolidation, which is an indication of the rate of consolidation, increased from 0.088 at 20% saturation to 0.324 at 100% saturation. It was observed that the hydraulic conductivity increased only by an order of magnitude from 2.83 x 10-8 m/s to 2.15 x 10-7 m/s as the degree of saturation increased from 20% to 100% when voids ratio varied between 0.305 and 0.338. This reveals that change in the hydraulic conductivity of the black cotton soil with increase in degree of saturation was not as remarkable as the change in compressibility. However the highest hydraulic conductivity value at 100% saturation (2.15 x 10-7 cm/s) is within the upper acceptable limit requirement for leak-proof waste containment liners (1 x 10-7 cm/s). 

 4th GeoChina International Conference 2016.

 Conference

 Hydro-Mechanical Properties Of Some Potential Clay Liner Materials In Southwestern Nigeria.

 Ojuri O.O., Uduebor M.A..

 2016

The influence of external applied stress on permeability of hydraulic barrier soils has not received adequate attention from researchers in recent times. The method of determining the coefficient of permeability (k) from back calculation from consolidation test is presented in this study. Special effort was made to derive a relationship between the coefficient of permeability and applied stress. Clay soil samples with potential for use as clay liners were taken in Akure, Southwestern Nigeria. Preliminary laboratory tests carried out on the samples include natural moisture content, particle size distribution test, pocket penetrometer test, and unconfined compression test. Consolidation test were performed on the soils, carefully simulating natural in-situ compression and the coefficient of permeability obtained ranged between 1.89 x 10-9 m/s and 1.35 x 10-11 m/s. Experimental results reported in this project indicate that permeability is inversely proportional to applied stress. For sample 1 when the pressure was 100 KN/m2, the coefficient of permeability was1.89 x 10-9 m/sec. however, when pressure rose to 3200 KN/m2, the coefficient of permeability dropped to 5.12 x 10-10 m/sec. Variation of voids ratio with progressive increment of applied pressure was monitored during the experimental programme. Statistical linear regression equation for the relationship between coefficient of permeability and the applied pressure gave a high coefficient of determination (0.985) with cubic polynomial best fit, which is close to 1, hence the best model for describing the relationship. Using the Samarasinghe, Huang and Drnevich, empirical relation between voids ratio and coefficient of permeability to validate the experimental results, log {k (1 + e)} - log e relationships have been obtained for the Akure clay soils. A comparison was made between the result obtained from the laboratory, the empirical Samarasinghe equation, and those reported by other authors. There was reasonable agreement to suggest that the coefficient of permeability values obtained from consolidation tests are reliable. 

 European International Journal Of Science And Technology,

 Journal

 Cost Prediction Models Of Components Of Building And Civil Engineering Construction In Akure Township And Its Environs, Ondo State, Nigeria.

 Aderinola O.S., Uduebor M. A. And Owolabi T.A

 2015

Forecast models for predicting future cost and prices of selected material, labour and equipment components both for building and civil engineering construction activities within the study area were generated based on past cost and price data collected. Prices, wages and hiring rate data for a defined period (2000-2010) were collated and stored in a database after which they were used to generate price indices using the Laspeyres index. A univariate (single variable) time series model was used to generate a forecast of future prices of the same selected components after the raw data had been adjusted by removing the effect of inflation. Series of analysis were carried out to ensure that effect of external forces like inflation, market forces etc. were removed giving a ‘constant’ (deflated) monetary value. The model was used to generate future cost and price data with subsequent error analysis carried out to verify the accuracy of the model. The generated models were found to be good descriptors of the price trends of the selected components with high degree of correlation. 

 The 4th Geotechnique, Construction Materials And Environment (GEOMATE 2014) Conference In Brisbane, Australia

 Conference

 Site Remediation In Nigeria: Proven And Innovative Technologies (Recovery Of Free Hydrocarbon From Soil/Groundwater).

 Ojuri O.O., Ola S.A, Fadugba O.G, Uduebor M.A

 2014

This research is concerned with geo-environmental impact assessment and remediation of contaminated soil/groundwater. The specific study site is Baruwa community (Latitude 06? 35' 12'' N, Longitude 03? 16' 21'' E), in Alimosho Local government area of Lagos state, Nigeria. The estimated 65,000 people of Baruwa own about 350 hand dug wells for domestic water supply; more than 200 of these wells are at present, under lock and key because of the oil seepage from leaking underground NNPC (Nigerian National Petroleum Corporation) pipeline. The Geoenvironmental Engineering research group in F.U.T.Akure, started Geoenvironmental site assessment, geotechnical, background and natural attenuation studies for the site in 2006. This has enabled delineation of the contaminated zone. Eight (8) hydrocarbon recovery/monitoring wells (W16, W17, W18, W19, W20, W42, W43, and W44) and two bore holes (W401 and W402) were used for the pilot recovery test. Existing contaminated water supply wells were used as hydrocarbon recovery/monitoring wells to minimize cost. Two boreholes were installed for soil vapour extracting and gas surveys in addition to the eight existing wells within the 100m x 100m designated pilot test area. We have already established that water supply wells are covered by pure phase leaking hydrocarbon products from the underground pipes. Tested well waters had been found to be as much as 95 percent petrol and up to 600 mm thickness of free hydrocarbon product on top of the ground water. Volumetric characterization of the pure phase hydrocarbon using Oil/Water Interface meter/ areal measurements and monitoring together with assessment of various technologies (Natural Attenuation, In Situ Chemical Oxidation and Bioremediation) for remediation was implemented for this site.