Engineering and expert services to support groundwater remediation using the Funnel & Gate system, to monitor the bioreactor and to extract tar oil.

From 1913 to around 1930 the Gustav Lang company "Factory for tar distillation, tar products and roofing felt" was located in the Kaiserlei district of Offenbach. During the Second World War, the former tar oil site was used as a dumping ground for rubble and household waste. In the course of investigations on the site, soil and groundwater contamination with organic pollutants - predominantly BTEX and PAK - were found. As components of tar oil, these have penetrated in phase to the base of the quaternary aquifer, from which released pollutants reached the outflow. A Funnel & Gate system with a bioreactor has been in operation at the site since 2017.

The following main services are advertised:

- familiarization with the existing project and the project documents including on-site visits, summarizing the state of knowledge;

- Adoption and construction of a numerical flow model;

- Plant controls (external monitoring) and engineering services in the office;

- Support of the AG and quality assurance;

- Review and ensure occupational health and safety measures;

- Data management and maintenance of the HIM-ASG database system (GW manager);

- Planning and coordination of monitoring services at the bioreactor and in the surrounding area including monitoring of the analysis service and documentation;

- Provision, provision, operation and maintenance of photometer and oxygen probe and other technical facilities for determining the key parameters oxygen and SAK;

- Water sampling and determination of SAK and oxygen in the individual reactor stages;

- Provision, provision, operation and maintenance of the equipment for carrying out monitoring examinations in the bioreactor and the trench;

- Conducting qualified pumping and / or tapping samples in the bioreactor and in the trench;

- sampling of dosing templates (H2O2 and nitrate);

- Provision, provision, operation and maintenance of the equipment for carrying out monitoring studies in the remediation environment, including water level measurements;

- Provision, provision, operation and maintenance of a mobile water activated carbon system for carrying out monitoring studies in the renovation environment;

- Implementation of qualified pump sampling in the renovation environment;

- traffic recording and condition control;

- Provision, provision, operation and maintenance of a tar oil discharge pump including peripherals (aggregate, riser, hose line, etc.) for carrying out the tar oil extraction as well as preparation, support and documentation of the tar oil extraction;

- Allocation of services from third parties (laboratory services and operating, maintenance and repair services).

Selected applicants will be able to find details later on in the job description.