Groundwater remediation is carried out by extraction, purification (P&T) and subsequent refiltration of the groundwater at the upstream boundary of the damage area. On the one hand, this is intended to remove pollutant mass from the area of the secondary source and, on the other hand, to stimulate the natural degradation of pollutants. Depending on the results of the first year of operation, nitrate may be added to the refiltered water. In the first year of operation, the extent to which the availability of electron acceptors in areas where currently low nitrate concentrations (< 5 mg/l) are currently present will be improved by groundwater extraction and pure filtration of the purified water alone. Extraction and pure filtration from 1.25 l/s to max. 2.0 l/s is planned. The groundwater purification plant consists of the following components: storage tank, pre-treatment + sand filter and activated carbon purification plant

LOT-0000
Nathan Hale Depot - Groundwater Remediation - PhIIIb.
The services to be provided on the basis of the recommendations in the restructuring plan and the official approval of the restructuring including ancillary provisions can be summarised as follows:
- Review and evaluation of existing documents
- Inspection of the property with representatives of the LBIH (NL South) and BIMA
- Preparation of a work and safety plan in accordance with DGUV
- Preparation of a work and safety plan in accordance with DGUV (explosive ordnance)
- Safety and health protection plan in accordance with BauStellV, integration of A + S plans
- Implementation planning of construction
- Implementation planning for operation and maintenance
- Preparation and participation in the awarding of contracts. Preparation of tender documents/tender documents
- Further preparations for the field work: in particular ensuring that the wells and pipelines are free of pipes and explosive ordnance
- On-site construction supervision
- Construction of the rehabilitation facility
- Borehole 2 new infiltration wells
- Construction of a rehabilitation plant
- Expert support (operation and maintenance GWRA; monitoring, coordination, implementation and auditing of GW monitoring; measurements of groundwater hydraulics; groundwater cut-off date measurements); 6 years
- Laboratory analysis, self-monitoring
- Surveying work according to BFR surveying
- Laboratory analysis, GW monitoring
- Accompanying GW monitoring;
- Approx. 15 measuring points (Partly several vers. depths),
-Duration; 6 years
- Input of the data required for EFA into the EFA file handed over by the Client, including GeoModul, in accordance with the supplied manual
- Evaluation of the results, preparation of various reports (final report for trial operation, annual progress reports, final report)
- Coordination with the parties involved (RP, BIMA, LBIH, city of Darmstadt, affected residents)
The work is being carried out on the basis of the Building Guidelines for Soil and Groundwater Protection (BFR BoGwS) in the latest version at the time of implementation (currently March 2022, available at https://www.bfr-bogws.de/index.html) of the Federal Ministry of Housing, Urban Development and Building (BMWSB) and the Federal Ministry of Defence (BMVg).
In particular, Annex 2.5 (Requirements for Sampling, Sample Pre-Treatment and Chemical Examination Methods on Federal Properties, as of April/May 2014) must be observed.
Hint:
the requirements of Annex 2.5 of the currently valid BfR are based on Annex 1 of the old BBodSch-VO.
If the provisions of Annex 2.5 conflict with the amended BBodSch-VO/Mantel-VO, the provisions of the amended BBodSch-VO/Mantel-VO must be observed.
- Until the publication of the revised BfR BoGwS, we refer in particular. with regard to the examination of the topicality and areas of application of methods, to the "Collection of Methods for Solid Matter Investigation" of the Advisory Board for Soil Investigations (FBU) and the LAGA Forum for Waste Investigation.