Agreement between the Canton of Basel-Landschaft, represented by the Government Council, and the Municipality of Holderbank (SO), represented by the municipal council, on the Joint Implementation of Wastewater Treatment for Langenbruck (BL) and Holderbank (SO) - Purpose (SO)

1. The Canton of Basel-Landschaft and the Municipality of Holderbank jointly conduct the wastewater remediation for the municipalities of Langenbruck (BL) and Holderbank (SO).

1. For this purpose, the following installations of common interest shall be established

a. Inlet channel from Shaft 48 in Langenbruck to Shaft 1 in Holderbank;

b. Main collection channel from Shaft 1 to Shaft 157 in Holderbank;

c. Inlet channel from Shaft 157 Holderbank to the connection to the regional channel of the Falkenstein Wastewater Association, Shaft 27 in Balsthal.

2. These installations are depicted on Plan 4500/1 of the engineering firm BSB dated December 2, 1976, which forms an integral part of the contract.

3. The treatment of wastewater shall occur, subject to any potential stormwater clarification basins, at the treatment plant of the Falkenstein Wastewater Association.

1. The Canton of Basel-Landschaft constructs and maintains the Langenbruck supply channel at its own expense pursuant to Article 2, paragraph 1, letter a. The municipality of Holderbank acquires the necessary transit rights at its own expense.

2. Holderbank constructs and maintains the Holderbank main collection channel pursuant to Article 2, paragraph 1, letter b. Holderbank bears the construction costs; the maintenance costs are shared equally by the contracting parties. The costs of extraordinary repairs will be distributed according to a special agreement, whereby the Canton of Basel-Landschaft is involved only if the damage is caused by wastewater from Langenbruck.

3. Holderbank constructs and maintains any stormwater clarification basin that may be required below Holderbank at a later date. The cost sharing will then be regulated according to mutual interest.

4. Holderbank constructs and maintains the supply channel to Balsthal pursuant to Article 2, paragraph 1, letter c. The construction and maintenance costs are shared equally by the contracting parties. Holderbank is entitled to request partial payments according to the progress of construction; it provides the Canton of Basel-Landschaft access to the construction accounts.

5. The entry fee for the facilities of the Falkenstein wastewater association is divided according to the calculated design flow rate (TWA) for the partial expansion: Langenbruck 9 l/sec, Holderbank 7 l/sec.

6. Federal subsidies are directly obtained by the contracting parties for their respective shares.

1. The municipality of Holderbank is entitled to connect the domestic wastewater of the existing individual properties (rehabilitation area) located above the village free of charge to the Langenbruck supply channel. For any new constructions, appropriate connection fees are to be paid to the Canton of Basel-Landschaft.

2. The Canton of Basel-Landschaft is entitled to discharge a maximum of 40 liters per second into the Holderbank main collection channel during partial expansion. When sizing the Holderbank main collection channel, 90 liters per second are considered for the wastewater from Langenbruck. However, this volume of water may only be discharged once a stormwater clarification basin has been constructed below Holderbank. Furthermore, the Canton of Basel-Landschaft is entitled to claim half the capacity of the supply channel to Balsthal.

3. All discharges must comply with federal regulations regarding wastewater conduits. The contracting parties are responsible for any damage caused by the characteristics of the wastewater according to the origin of the pollutant.

1. Holderbank, including the wastewater share from Langenbruck, joins the Wastewater Association Region Falkenstein (ZAF).

2. The Canton of Basel-Landschaft transfers full representation of its interests at the ZAF to Holderbank. Holderbank undertakes to protect these interests. For extraordinary expenses related to this representation, Holderbank will be compensated by the Canton of Basel-Landschaft.

3. The Canton of Basel-Landschaft commits to complying with all relevant statutory and regulatory provisions of the ZAF and allows its bodies, as well as the specialist bodies of the Canton of Solothurn, to inspect the wastewater in Langenbruck, particularly in industrial-commercial facilities, upon reasonable prior notification to the Water Management Office Basel-Landschaft.

4. The Canton of Basel-Landschaft provides Holderbank with any assistance necessary to clarify issues arising from the ZAF or the municipality of Holderbank regarding wastewater originating from Langenbruck. If Holderbank is held liable by the ZAF for consequences stemming from wastewater flowing in from Holderbank, without the causes being determinable, the contractual partners are jointly and severally liable.

5. The ZAF's cost calculation is decisive for the apportionment of operational, maintenance, and administrative costs for using the Falkenstein Wastewater Association's facilities; separate invoicing should be pursued.

1. As supplementary law, the legislation of the Canton of Solothurn shall apply.

1. This contract is firmly established for a period of 50 years and may be terminated for the first time at the end of the 50-year contract period with a notice period of 6 years.

2. If this contract is not terminated in due time, it shall be impliedly extended for an additional 10 years. It may then be terminated at the end of each ten-year period with a notice period of 6 years.

3. If one party terminates the contract, they shall pay the other party reasonable compensation for the disadvantages incurred due to the termination.

1. This contract shall enter into force following approval by the municipal assembly of Holderbank, the Executive Council of the Canton of Solothurn, and the Cantonal Council of Basel-Landschaft, subject to the condition of Holderbank joining the Falkenstein Wastewater Association.