Selected the site for field demonstration from a number of candidate sites
Selected a special version of point-velocity-probe (SBPVP) that can measure both vertical and horizontal seepage velocity
Proposed to collect sediment cores for measuring sediment bedding anisotropy
Proposed to conduct SEAWAT modeling to quantify dilution/attenuation factor
Drafted the key portion of the field demonstration plan
Analyzed existing soil data to select the locations for excavation;
Designed a passive soil vapor sampling to estimate the initial excavation extent;
Computed risk-based target concentrations to meet cleanup requirements while minimizing the volume of soil to be excavated;
Finalized lateral excavation limits by inferring the extent of target concentrations with a robust interpolation algorithm;
Oversaw the field work and occasionally took lead of the field work oversight.
One of the two primary authors of this study and the final report;
Reviewed historical literature on shallow gas occurrence and groundwater quality in relation to regional geology, oil field development, and development practices;
Assessed the integrity of oil and gas wells and conditions of pits, and compared groundwater quality data collected in 2014 against historical data and standards;
Evaluated the potential for fracking fluids and production gas to enter shallow groundwater, and recommended further activities to protect domestic water wells.
Conducted research and analyses on major MTBE impact cases across the nation and compared the predicted MTBE impacts to actual impacts;
Provided a thorough literature review on the biodegradability and attenuation of MTBE in the subsurface to better understand its fate after nationwide MTBE ban;
Refuted several claims of the counter-side’s primary expert witness such as the inappropriate comparison of MTBE impacts to nitrate impacts;
Drafted the technical portion of the expert report for a key expert witness.
Constructed a 3-D visual imagery model of the site to facilitate assessment;
Evaluated the existing remedial measure and identified its lack of effectiveness;
Led a field team and conducted slug and aquifer tests, LNAPL baildown tests, and tracer dye testing to assess LNAPL recoverability and contaminant transport;
Revised the site conceptual model and implemented more cost-effective remedial measures towards a faster site closure.
Supported the Charnock Technical Advisory Group (CTAG) on the fate and transport modeling of the MTBE and TBA (tertiary butyl alcohol) plumes;
Assisted in model development and additional plume characterization activities;
Simulated various scenarios of future impact to the well field once reopened.
Supported the Carson Regional Groundwater Group (CTGG) on the impact of regional oil refineries and related operations;
Constructed a 3-D visual imagery model of the region to facilitate model development and interaction within CTGG and with the US EPA;
Assisted in model setup, calibration, and uncertainty analysis;
Conducted contaminant source tracing for forensic analysis.
Developed with GSI Environmental Inc. (GSI) for the Air Force Center for Environmental Excellence (AFCEE) to streamline and optimize long-term groundwater monitoring programs;
Author of the optimization methodologies (location and frequency reduction/ augmentation, and data sufficiency analysis) and the primary developer of the software.
In charge of Technical Memo No. 3 General Site Conditions (physical settings, environmental concerns, flood prevention, odor control, and land development and design criteria);
Provide input for Technical Memo No. 16 Effluent Discharge and Oufall;
Responsible for collecting and assessing data, conducting research, coordinating and reviewing subconsultant work, and drafting Technical Memos.
Served as Project Engineer and later Deputy Manager;
Worked on and managed over 30 projects;
Responsible for preparing Request for Proposal, reviewing Proposal, Pricing, and Shop Drawing, managing Request for Information and Change, conducting related Engineering Design when required, and coordinating with City and Contractor.
In charge of process design for the preliminary engineering;
Performed hydraulic calculations for the entire process;
Determined dimensions of major structures and selected relevant equipments;
Completed plant layout and the layout of major pipelines (wastewater, sludge, recycle sludge, and storm).
Author of the expert system algorithms;
Primary developer of the software using the C Language;
Collected and compiled the spporting data and conducted case studies
Remedial excavation of petroleum hydrocarbons contaminated soil at an active Port facility in California. Conducted an upper confidence limit analysis of existing soil concentration data to determine the potential locations for excavation. Designed the sampling plan using passive soil vapor samplers to provide an initial estimate of the excavation extent at the selected locations. Computed risk-based target concentrations for the sidewall and bottom confirmation soil samples to meet cleanup requirements while minimizing the volume of soil to be excavated. Finalized lateral excavation limits by inferring the extent of target concentration based on sidewall confirmation samples with a robust interpolation algorithm. Oversaw the field work and occasionally took the lead of the field work oversight.
Investigation of the potential contamination of domestic water wells in the Pavillion, Wyoming area where hydraulic fracturing in the Pavillion Oil Field has been suspected to be the cause. Conducted a thorough literature review of historical water quality issues in relation to oil and gas development in this area. Assessed the water quality of select domestic water wells, the integrity of nearby oil and gas wells, and historic pits in the Pavillion area. Clarified water quality concerns and assessed the need for any further action to protect drinking water resources in the Pavillion area. Key author of the final report which can be found at the following link: http://deq.wyoming.gov/wqd/pavillion-investigation/resources/investigation-final-report/
Site conceptualization and remedial design for a former truck maintenance facility in California. Identified the fractured rock/clay nature of the underlying water–bearing units, obtained fracture porosity information through literature review, and provided a reliable range of LNAPL volume estimates. Evaluated various LNAPL remedial alternatives including hot water flooding and electrical resistance heating, and recommended a less risky yet cost-effective method to achieve LNAPL recovery to the asymptote in a reasonable timeframe. Designed an in-situ chemical oxidation pilot study for treating groundwater at a localized area containing elevated VOC concentrations.
Assessment, characterization, and remediation for a former gas plant site in Texas. Performed a thorough evaluation of the site hydrogeologic and contamination conditions by incorporating site data into a 3-D visual imagery model. Evaluated existing remedial actions and identified its lack of effectiveness. Conducted further characterization activities including LIF-ROST investigation, slug tests, aquifer yield tests, LNAPL baildown tests, LNAPL recovery assessment, and tracer dye testing. Revised the site conceptual model and implemented more cost-effective remedial actions towards a faster site closure.
Assessment, characterization, and remedial evaluation for a Texas oil refinery along shoreline. Developed a 3-D visual imagery model integrating the upland area and the offshore area to study the geological, hydrological, and contamination conditions. Estimated the potential seepage risk along the shoreline through the evaluation of lithology, LNAPL thickness, dissolved concentrations, and tidal fluctuations. Identified preferential flow zones and classified the shoreline into different zones of risk. Assessed various remedial strategies and prioritized the remedial actions.
Assessment, remediation support, and risk assessment for petroleum hydrocarbons contamination at a diesel bulk storage facility in the San Francisco Bay Area. Developed a 3-D visual imagery model for the site and prepared presentations for client and regulatory meetings. Delineated the areal extent and depth of remediation, evaluated remedial strategies, and assisted in remedial design. Conducted human health and ecological risk assessment for the site: identified the significant and complete routes of exposure; developed cleanup goals for protecting ecological receptors by taking into account the dilution and attenuation of groundwater concentrations due to tide-induced mixing near the Bay; calculated exposure point concentrations for comparison to regulatory screening levels and developed cleanup goals; and conducted quantitative calculation of the cancer and non-cancer risks for pathways rarely addressed in regulatory guidance. This risk assessment provided the basis for a subsequent site risk management plan leading to closure of the site.
Characterization and remediation pilot test at a natural gas compressor station in Texas. Conducted additional drilling and obtained a better understanding of the site lithology and groundwater conditions. Conducted in-situ chemical oxidation (ISCO) pilot test using calcium peroxide to evaluate its feasibility. Conducted tracer dye testing at new borings and existing monitoring wells to understand field transport conditions.
Assessment of MTBE/TBA contamination due to truck operations at a California site where public and domestic drinking water wells were impacted or threatened. Identified potential transport pathways both horizontally and vertically, evaluated MTBE/TBA attenuation trends both temporally and spatially, and concluded that MTBE/TBA will be further attenuated within the monitoring network, posing no threat to downgradient public and domestic wells. A No Further Action request based in part on the assessment was approved and the site is now in a 60-day public comment period pending closure.
Assessment, characterization, and remediation of chlorinated solvents contamination at an Oklahoma chemical plant. Studied site data, identified data gaps for additional characterization, refined site conceptual model, and evaluated remedial options for the DNAPL source and dissolved plumes. Source excavation for DNAPL removal and natural attenuation for dissolved plumes were finally selected and implemented. Designed and implemented ISCO using RegenOX at one source area where excavation was not possible.
Remedial planning for dissolved petroleum hydrocarbons contamination at an oil refinery in California. Conducted groundwater modeling to delineate zones of hydraulic influence for the placement of pumping wells and remedial systems.
Assessment of well network for monitored natural attenuation (MNA) at a California oil refinery. Conducted particle tracking simulations and utilized 3-D visual imagery to evaluate the effectiveness of each monitoring well in tracking the dissolved plume.
Design of carbon adsorption systems for treating petroleum hydrocarbons contaminated groundwater from residential wells downgradient of a fuel terminal in Texas.
Assessment of petroleum hydrocarbons and heavy metals contamination at a bulk fuel terminal site along a major river in Oregon. Identified the sources, potential transport pathways, and extent and magnitude of the contamination. Developed a site conceptual model that facilitated the remedial evaluation and planning. Conducted hydrological and hydraulic analyses and provided an evaluation of the potential impact on river sediment.
Feasibility study and remedial action planning of fuel oxygenates contamination (MTBE and TBA) at a service station site in California. Evaluated multiple remedial options and proposed action plans.
Analysis, characterization, and risk assessment of petroleum hydrocarbons contamination at an active port facility in California. Investigated preferential pathways, tidal influence, plume stability, and soil vapor issues, and demonstrated the effectiveness of site remediation through visualization and statistical analyses. Designed and implemented a field characterization work to quantify the mixing of groundwater and seawater within aquifers caused by tidal action. Evaluated and improved the long-term monitoring program at the site. Participated in the development of risk-based cleanup goals for human health and ecological receptors at the site, identified the inappropriateness of some of the regulatory criteria, and conducted field and modeling studies to determine the appropriate cleanup goals.
Development of site conceptual model for LNAPL contamination at an oil refinery in California. Assessed site characterization data, built a 3-D site visual imagery model, delineated LNAPL distribution in the subsurface, and identified preferential pathways.
Assessment of mineral distribution in coal slurry impoundments for numerous mining sites across the nation. Estimated coal volume, quantity, and recovery progress and superseded traditional 2-D mapping with 3-D interactive imagery in presenting the results.
Design of an interception/treatment system for groundwater remediation at a former Manufactured Gas Plant (MGP) site in Florida. Used groundwater modeling to determine the configuration and layout of an interceptor wall and a treatment trench.
Assessment of sediment contamination at a harbor site in Florida and a lake site in Washington. Estimated contaminant distribution in the sediment and provided remedial calculation utilizing 3-D visualization techniques.
Characterization, assessment, and remedial planning for various projects: LNAPL contamination at three gas plants in Texas and Minnesota, DNAPL contamination at three former MGP sites in Indiana and Florida, oil-water interaction in rock fractures at a Texas oil well field, impact of coal-bed methane at a gas well site in Kentucky, soil vapor contamination at an oil refinery site in California, and chemical contamination at two industry sites in New Jersey.
Modeling of variable-density flow using SEAWAT at an active port facility in California. Developed a 3-D cross sectional model to estimate the dilution of contaminant concentrations caused by tidal fluctuation within the aquifer near the aquifer-ocean boundary. Two scenarios were simulated: a vertical sheet pile wall boundary and a sloping riprap boundary. The dilution factor was calculated as the ratio of total outflow to the net groundwater outflow. Simulated results of salinity distribution and groundwater fluctuations within the aquifer were used to guide the installation of two lines of monitoring wells that are perpendicular to the shoreline and at different depths. Refined and calibrated the model using field-collected data. This modeling study was crucial in developing the dilution-attenuation factor and the subsequent site cleanup goals, both of which were approved by the regulatory agency.
Development of a variable-density flow model using SEAWAT to calculate groundwater cleanup goals at an active marine fuel terminal site near the San Francisco Bay. Constructed a 3-D cross sectional model based on actual site data and conservative assumptions of key model parameters. Estimated an overall dilution factor of for the upland area and an effective dilution factor for site monitoring wells closest to the shoreline. The groundwater cleanup goals applicable to site monitoring wells for evaluating the exposure of marine aquatic receptors were calculated as the marine surface water cleanup goals multiplied by the effective dilution factor. This was approved by the regulatory agency and expedited site remediation and closure.
Development of a groundwater fate and transport model for heavy metals contamination at a former fertilizer manufacturing plant site in North Carolina. The modeling effort was focused on arsenic, the more mobile and prevalent metal at the site, using MODFLOW and MT3D for flow and dual-domain transport simulations. Applied the model to refine characterization of the hydrogeologic and geochemical conditions at the site and assessed the potential for future plume migration.
Modeling of dissolved PCBs transport resulting from soil contamination at an industrial facility in New Jersey using the AT123D analytical model. Assessed the potential migration and extent of the dissolved PCBs for different combinations of source release, hydraulic, and sorption conditions.
Development of a groundwater fate and transport model for remedial planning at a fuel terminal site in Virginia. Used MODFLOW-SURFACT to simulate the dissolution of residual LNAPL and subsequent reactive transport in vadose and saturated zones.
Development of a groundwater flow model for remedial evaluation at a Delaware refinery. Simulated the groundwater system in connection with a river to investigate the potential impact of a proposed 550-foot sheet pile wall along the river shoreline.
Review of a groundwater fate and transport model for MTBE and TBA contamination at a public well field in California. Performed a thorough check of model assumptions and parameters and estimated a reasonable initial mass for use in transport simulations.
Development of a groundwater fate and transport model to evaluate natural attenuation with source control at a dry-cleaner site in Texas. Used RT3D to simulate reductive dechlorination and conducted an uncertainty analysis to assess the reliability of model predictions.
Development of a groundwater fate and transport model to study chlorinated solvents contamination at an industrial site in South Carolina. Conducted various modeling analyses to support site assessment and remedial design.
Key contributor to the development of a regional groundwater flow model surrounding an oil refinery in California. Developed model boundary conditions, checked calibration targets, evaluated parameter sensitivity, and assisted in model calibration.
Development of a groundwater flow model for the design of an interception/treatment system at a former MGP site in Florida.
LNAPL mobility analysis and recovery calculation for a California site using various LNAPL modeling tools developed by the American Petroleum Institute (API).
Development of a numerical NAPL model to simulate fuel hydrocarbons release and the subsurface migration at a railroad site in North Dakota. Used finite-element code BIOSLURP to simulate the LNAPL migration and extent under historical site conditions.
Development of a numerical model with BIOSLURP to evaluate the feasibility of LNAPL removal via vacuum enhanced recovery at an Oklahoma gas plant. Evaluated a number of scenarios to find the optimal number and configuration of dual phase recovery wells.
Development of numerical model with BIOSLURP to evaluate the feasibility of an LNAPL recovery trench design at a Washington site.
Modeling analysis for a pipeline release in Europe to simulate the fate and transport of LNAPL and dissolved plume using finite-element codes ARMOS and BIOTRANS.
Modeling evaluation of contaminant transport, tracer test, capture zone, and aquifer characteristics for numerous projects using analytical codes such as BIOSCREEN, BIOCHLOR, SOLUTE, WHPA, TWODAN, AQETSOLV, and HSSM.
Technical support for a major MTBE litigation involving a State suing major oil companies. Conducted a thorough literature review on MTBE and TBA biodegradation potential, including laboratory and field evidence and emerging confirmation techniques such as stable isotope and molecular biological analyses. Compiled most recent state-wide studies on MTBE remediation and biodegradation that have clearly demonstrated the reduction in magnitude and frequency of MTBE impact once it was phased out. Conducted a retrospective review of three major MTBE litigation cases by comparing the opposite side’s arguments and predictions against actual observations and recent data. The comparison demonstrated their errors in assumptions and predictions, providing a more likely scenario of the longevity and behavior of MTBE in the subsurface. Refuted the claim that MTBE resembled certain other chemicals in terms of groundwater impact by enumerating their distinct differences in many aspects with substantial supporting data. These technical analyses are crucial parts of an expert report submitted for the case.
Technical support for a California case regarding the potential impact of rising groundwater levels due to proposed basin-scale storage program on facilities with environmental contamination. Conducted a thorough evaluation of the proposed program including a regional groundwater model for simulating the proposed storage scenario. Identified serious deviations in the proposed storage scenario from conceptual foundations on which the storage program was proposed, and clearly demonstrated that simulated rises in groundwater levels by the proposed storage scenario, claimed to be a likely maximum rise, are not even close to the worst case. Pointed out the incapability of the regional groundwater model, which lacks horizontal and vertical resolution, to accurately simulate groundwater level changes on the scale of individual facilities or sites. The technical analyses led to the opposite side agreeing to add a process to the proposed program to allow individual facilities to assess impact and offering to model additional storage scenarios, among others.
Technical analysis and visualization service for a California case involving gasoline and diesel release at a service station. Assessed potential past releases over the operating history and estimated the mass of the contaminants using advanced 3-D interpolation technique. Generated a set of convincing animations to present site hydrogeologic conditions, plume migration through time, and mass allocation results. This work led to a verdict in favor of the client.
Technical support for a legal dispute over remediation costs for a former petroleum terminal in California. Based on site use, potential receptors, hydrogeologic conditions, and risk screening, the remedial endpoint and methods that would be considered reasonable at the time of property transfer were determined with the related costs quantified. In addition, a presentation package detailing these findings was prepared for the legal team to facilitate negotiation. This work led to a settlement that significantly reduced the client’s payout.
Technical analysis and preparation of expert & rebuttal reports for a California case regarding cost allocation for gasoline and diesel release in an industrial area. Reviewed site ownership and operating history, assessed forensic and hydrogeologic data, evaluated site data with a 3-D visual imagery model, conducted contaminant mass and liability allocations, evaluated remedial system performance, and proposed further remedial strategies. Proved that significant contributions of contaminants from potential offsite sources was impossible by assessing sanitary sewer and storm drain networks and by comparing the spatial distribution and concentration levels of key contaminants in site vicinity. The work resulted in recovering $4.25 million in remediation cost.
Technical analysis and state-of-the-art visualization service for a major litigation case in North Dakota involving fuel hydrocarbons release from a railroad site. Assessed site hydrogeology and built a 3-D visual imagery model to visualize the distribution of LNAPL in a complex geologic setting with a fluctuating water table. Conducted numerical modeling to simulate the LNAPL release and migration in the subsurface. Demonstrated that it was impossible for the LNAPL reaching a certain area of concern. The technical analyses and 3-D visualization exhibition significantly strengthened the client’s case, resulting in a verdict that saved the client tens of millions of dollars.
Technical and visualization analyses for a Missouri case regarding a limestone quarry flooded by nearby river flow. Studied quarry operation history and water breakthrough events and investigated potential causes. Developed a 3-D visual imagery model to help understand the interrelationships between quarry operation, change in hydraulic conditions, nearby sinkhole occurrences, and water breakthrough. Demonstrated that it was the deepening and dewatering of the quarry that caused the subsurface channeling and subsequent flooding. The analysis led to a settlement in favor of the client.
Technical and visualization support for a litigation case in Colorado where a river was impacted by former MGP derived coal tar DNAPL. Assessed site characterization data and developed a 3-D visual imagery model of the site. Investigated the petroleum hydrocarbons impact from a nearby service station. Evaluated the commingling of the DNAPL and the dissolved petroleum hydrocarbons plume. Conducted transport analysis to illustrate the change in DNAPL migration under the influence of dissolved petroleum hydrocarbons. A settlement was reached in favor of the client.
Technical analysis and visualization service for a number of litigation cases involving methane vapor intrusion, petroleum hydrocarbons contamination, and heavy metals pollution at oil exploration, gas and chemical plants, refinery, bulk fuel terminals, and service station sites.
Development of a three-component soil sampling program for an active port facility in California. The sampling program was designed to confirm if cleanup has been achieved in certain treatment areas, demonstrate the progress of remediation, and to identify potential hot spots at some historical source areas. The number of sample size and locations were determined based on the evaluation of historical sampling data, derived population statistics, and historical site information. Designed a triangular grid sampling covering the study area to obtain representative areal mean or mean-based statistics, and to provide hot-spot detection together with proposed subjective samples.
Analysis of sheen monitoring data to assess the effectiveness of the corrective action at a diesel bulk storage/distribution facility in eliminating the intermittent appearance of sheen on San Francisco Bay water. The size of sheen, frequency of sheen occurrence, and their temporal trends were analyzed. Bubble plots were used to illustrate sheen patterns and trends over time and relative to tide levels. Composite plots integrating bubble plots and bar graphs were created to evaluate the effect of precipitation on sheen size and occurrence. Trend analysis was utilized to reveal changes in sheen size and frequency of occurrence over time. Results were compared for both pre- and post-corrective action monitoring data and for areas within and outside of the corrective action area. In addition, animations of sheen occurrence on Bay water were generated to facilitate interaction and communication with regulators. The analysis successfully demonstrated the effectiveness of the corrective action and led to the termination of the sheen monitoring program.
Development of a statistical evaluation method for determining the frequency of sampling at monitoring locations and a geostatistical method for optimizing a monitoring network. Applied these methods to multiple sites to evaluate their groundwater monitoring programs.
Application of appropriate statistical analyses to a groundwater monitoring program at an airport site in Washington. Client was concerned with elevated arsenic concentrations and wanted to know if they were true exceedance. Proposed intra-well analysis using combined Shewhart CUSUM Control Chart, seasonality adjustment, and verification re-sampling. Set up the protocol for statistical analysis after the project was awarded.
Improvement on the statistical evaluation of remedial performance at an active port facility in California. Selected Sign test for site-wide comparison to address the significant percentage of non-detects in the monitoring data and replaced linear trend test with a nonparametric test.
Statistical analysis for LNAPL investigation at an oil refinery in California. Assessed the changes in LNAPL composition over time using an altered version of Mann-Kendall analysis and revealed the difference between samples from different depths with paired t-test.
Direction of the sediment mapping of polychlorinated biphenyls in a 6-mile river section in Washington. Problems emerged when two firms presented inconsistent results using different methods (kriging vs. IDW). Identified the cause of such differences, introduced Thiessen Polygon method for additional check, examined the goodness-of-fit by cross-validation, and directed GIS specialists on how to improve the mapping.
Statistical analysis for compliance evaluation at a number of sites and application of geostatistical uncertainty analysis to soil and groundwater characterization programs for suggesting locations of sampling.
Development of a set of spatial and temporal methodologies for evaluating groundwater monitoring plans. The methodologies handle many aspects of monitoring evaluation (spatial redundancy reduction, network augmentation, frequency optimization, and sufficiency analysis) and allow the dynamic optimization of the monitoring program as site and contaminant conditions change over time.
Key author and primary developer of the AFCEE’s decision-support software, Monitoring and Remediation Optimization Systems (MAROS), which is available to the general environmental practitioners for formulating cost-effective and scientifically-based long-term monitoring plans. Constantly provide guidance on how to use or benefit from the software for practitioners and researchers seeking suggestions.
Evaluation of groundwater monitoring programs six sites across the nation as part of a joint U.S. EPA & AFCEE study for demonstrating innovative long-term monitoring optimization strategies and their applicability.
Optimization of groundwater monitoring programs at numerous other sites to achieve more effective and/or efficient monitoring on a dynamic basis over the life cycle of the projects.
Walnut Creek Wastewater Treatment Plant (WWTP) Optimization and Facility Plan, Austin, Texas, 2018-2019. The Facility Plan is to optimize and upgrade the Walnut Creek WWTP, the largest WWTP of the City of Austin, from current 75 MGD to the ultimate capacity of 150 MGD. In charge of Technical Memo No. 3 General Site Conditions (physical settings, environmental concerns, flood prevention, odor control, and site development criteria) and served as Project Engineer for Technical Memo No. 16 Effluent Discharge and Oufall. Responsible for collecting and assessing data, conducting research, coordinating and reviewing subconsultant work, and drafting Technical Memos.
Engineering and management of the City of Austin Facility and Force Main IDIQ Project, Austin, Texas, 2018-2019. Served as Project Engineer and later Deputy Manager, responsible for preparing Request for Proposal, reviewing Proposal, Pricing, and Shop Drawing, managing Request for Information and Change, conducting related Engineering Design, and coordinating with City and Contractor. This contract covers small- to medium-scale design and construction projects for the City’s three major Water Treatment Plants (WTPs), three major Wastewater Treatment Plants (WWTPs), more than 100 Lift Stations and Package Plants, and over 30 Pump Stations and Reservoirs.
Design of a 100,000 ton/day (26.5 MGD) Urban WWTP in XinJiang Autonomic Region, China (新疆昌吉市十万吨城市污水处理厂初步设计). The treatment process consists of bar screening, grit removal, activated sludge treatment by oxidation ditch, sedimentation, disinfection, and sludge digestion and dewatering. Completed hydraulic calculations for the entire process, determined dimensions of major structures, selected relevant equipments, designed plant layout, and conducted hydraulic calculation and layout of major pipelines (wastewater, sludge, recycle sludge, and storm).
Design of the aeration tank and bar screens for a 50,000 ton/day Urban WWTP in northern China. Performed hydraulic calculation, determined dimensions, calculated air volume, and selected blowers and aeration equipment.
Feasibility study of an Urban WWTP for DuYun, GuiZhou Province, China (贵州都匀市城市污水处理厂可行性研究报告). Performed a water budget calculation, estimated wastewater quantity and contaminant loadings, and considered the city’s population and development blueprint. Proposed a conventional activated sludge process with a treatment capacity of 100,000 ton/day. Calculated process parameters and conducted an engineering economic analysis on the cost-benefits of the proposed project.
Primary author/developer of the Urban WWTP Process Selection Expert System for the Ministry of Construction of China (城市污水处理厂工艺方案选择专家系统 – 建设部国家八·五计划攻关课题). This decision-support software selects the optimal treatment process by evaluating experts’ opinions regarding capital and operation costs, land use, technical maturity, operation and maintenance difficulty, and discharge quality.
Design of carbon adsorption treatment systems for treating petroleum hydrocarbons contaminated water from residential wells downgradient of a fuel terminal in southeastern Texas.
Sampling of effluents from community wastewater treatment plants in the Greater Houston Area, Texas for a Total Maximum Daily Load (TMDL) project.
Preparation of water quality permit application and storm water pollution prevention plan (SWPPP) for remediation-related construction projects or intrusive work, and implementation of the associated best management practices (BMPs).
Technical support for the MTBE (methyl tertiary butyl ether) litigation brought by the State of New Hampshire against major oil corporations. Conducted research and analyses on major MTBE impact cases across the nation and groundtruthed the predicted MTBE impacts by the opposite side’s primary expert.
Technical support and preparation of an expert report for the MTBE litigation brought by Puerto Rico against major oil corporations. Researched major MTBE impact cases across the nation and compared the predicted MTBE impacts to actual impacts. Provided a thorough literature review on the biodegradability and attenuation of MTBE in the subsurface to better understand its fate after nationwide MTBE ban. Refuted several claims of the counter-side’s primary expert witness such as the inappropriate comparison of MTBE impacts to nitrate impacts.