Geotechnical-mark-assessment of brown carbon and clay pits in Maxhütte-Haidhof.

Maxhütte-Haidhof is located in the southwestern part of the Oberpfälzer district Schwandorf about 20 km north of Regensburg on the federal highway 93. The brown coal and clay pits to be viewed are located in the city of Maxhütte-Haidhof.

The aim of engineering services is the geotechnical-market assessment of daily openings and day-to-day mining and open pit mining, as well as the derivation of old mining related risks to public safety. The pit water solution of lignite pits and clay mines, in particular through karst cavities, must be taken into account.

As a result, recommendations are to be derived for exploring, custody or safeguarding the scald-endangered pit construction and open pit embankments in order to permanently eliminate the risks posed by mining mines.

The processing has to be done step by step and has to be coordinated with the client regularly at monthly intervals in the context of meetings held at the Bergamt in Northern Bavaria. Depending on the processing and interim results, the work steps can be more or less labor-intensive. These work steps and processing results must be documented.

The single pits located in Maxhütte-Haidhof must be described and viewed separately within the expert assessment if they do not have a local and operational context.

The results of the geotechnical-mark-state exploration (risk analysis) as well as the security concept must be presented in a presentation.

See II.1.4) Short description.

In addition, the following extracts (!!!) communicated from the SOW:

4.1 Searching and evaluating documents and pit cracks:

The geotechnical-mark-specific conditions including old-mining conditions at the site of brown coal and clay pits are to be clarified by the appropriate research. The implementation and results of these searches are described in the report. In the run-up to the geotechnical-mark-governmental assessment, a foundation assessment for known documents for the study area was prepared in various archives and authorities on behalf of the Bergamt Northern Bavaria. As a result of the basic material determination, crack works, historical operating records, mining damage analyses, exploratory documentation, expert reports, etc. were evaluated taking into account the information content. A complete list of the documents viewed and evaluated is listed in Appendix 2 of the basic analysis. Appendix 2 also refers to reproductions to be produced. An overview of the relevant archive documents to be evaluated is contained in Appendix 2 of the SOW. The relevant documents are stored in the following institutions and must be viewed or procured on site:

— Bergamt North Bavaria (Bayreuth),

— Bavarian Main State Archive (Munich),

— State Archives Amberg (Amberg),

— State Archive Bamberg (Bamberg),

— Stadtarchiv Maxhütte-Haidhof,

— Bavarian State Office for the Environment (Court).

In the course of evaluating the relevant documents, important information for the task has to be determined and evaluated and obtained if necessary (copy, scan, etc.). The relevant mine files are mainly written in typed writing. A third of the mine files are written down and read in old German manuscript. The relevant files cover a period from 1835 to 2018 and include, among other things, maps, pit cracks, plans, drawings, photos, evaluations and reports, certificates, chronicles, information on mountain damage as well as carried out safeguarding/custody work, drilling, operating plans with cracks, geological, hydrological and storage, geotechnical and hydrogeological studies and information on the suspected and location of various mine fields. The official mine paintings in the Bergamte Northern Bavaria are mostly scanned, only the pit image for the clay mine Rohrhof I, II and Winkerling is analogous. The geological maps in the LfU are also available digitally. The files of these cracks and maps are listed in the basic determination and are digitally handed over to the contractor.

Further documents can be viewed or obtained from the following institutions:

State Office for Digitization, Broadband and Surveying in Munich (LDBV):

— basic geographic data (topographic maps, orthophoto, DGM1, ALKIS, etc.),

— historical aerial photographs, measuring table sheets and bay.

—Soldner coordinate system transformation parameters.

Bergamt North Bavaria:

— land register statements (proof of ownership) of affected parcels.

City administration, district office, water management office, etc.

— construction guidelines, land use plans, protected areas, suspected contaminated sites, combat equipment loads, contracts for the re-use of pit works and the use of mine water.

Utilities:

— existing plans, management plans (locally and regionally important line lines).

Teublitz Ton GmbH and Rohstoffgesellschaft mbH

— plant and operating files,

— Digital pit image.

Engineering office for market separation, surveying and mining planning G. Kuhn (Bernhardswald):

— Mountain damage assessments.

Engineering firm GolHo (Niederschöna):

— Mountain damage assessments.

Eyewitness Survey:

— including Ponholz e. V..