The subject of the contract is the execution of construction works as part of the task: "Construction of pipe culverts on the Dobrzanka stream and its tributaries, with the insurance of the stream at culverts and reconstruction of road surfaces, crossings ford through the Dobrzanka stream, strengthening of the edge of the Dobrzanka stream in the form of stone boundary bands" , reference ID no. 04-02 / R / 02 / UE / a / 1-1. 2. The contract includes: 1) construction of 6 pipe culverts for arched objects with greater light in the Dobrzanka stream and its tributaries. 2) construction of 4 ford fords across the Dobrzanka stream 3) performance of 7 fortifications of the Dobrzanka stream shore

The works contract includes:

1. Construction of 6 pipe culverts for arched objects with greater light in the Dobrzanka stream and its tributaries - new culverts (P1, P2, P3, P4, P5, P6) are designed in the place existing after demolition. The culverts are designed from spiral-corrugated steel pipes with an arc-circular shape. The culverts will be placed on benches made of 30 cm thick natural aggregate. The bottom and slopes of streams above the inlet and below the outlet will be insured (earthworks, demolition of old culverts, preparation of the ground and foundations, ordering and installation of pipes for culverts, strengthening of diagonal slopes at the inlet and outlet of the culverts, reconstruction of the surface of the poviat road at P1, P2, P3 , reconstruction of the surface of logging routes).

2. Construction of 4 fords through the Dobrzanka stream - passing fords (Bród B1, Bród B2, Bród B3, Bród B4) through the Dobrzanka stream are located on existing logging routes designated for the use of forest resources. The fords are to enable safe passage from the poviat public road to the forest areas managed by the Bircza Forest District. Journeys with arranged fords will not cause erosion and pollution of the stream bed, as well as allow for safe use of means of transport. The fords will be part of the logging routes. The fords will include a belt reinforced with a 5 m wide stone in the stream bed and the length depending on the span of the stream bed and the design of driveways. Beards as well as access to them, as pedestrian - roadways are designed with a width of 5 m. Beard surfaces will be made of stone pavement 30 cm thick limited and protected by a palisade of round logs 10 - 12 cm and length 100 cm. Each of the fords will be recessed in the bottom of the stream bed, which means that the level of the ford surface will be consistent with the surface of the bottom of the stream bed. This solution will ensure full ecological patency along the watercourse. Above B2 ford it is planned to insure the shore of the concave Dobrzanka stream from the side of the poviat road for a length of 16.30 m with a stone shore band (construction of passages in the stream bed, construction of slopes to the fords, strengthening of the stream bed above and below the fords, shore band above the B2 ford .)

3. Execution of 7 strengthening of the Dobrzanka stream shore - the purpose of making 7 sectional strengthening of the Dobrzanka stream banks is to protect the poviat road and forest areas against the erosive effects of the stream waters. The crown of the edge bands was designed 100 cm above the bottom of the stream. The bands will be made of stone cover. Stone diameter minimum 50 cm, wedged with broken stone of smaller dimensions. The stone coating on the slopes will be made on a fascine wall 25 cm thick. The base will be placed 50 cm below the bottom of the stream. Two types of bands will be made: · Type 1: - slope of the underside slopes - 1: 1.5, - width of the band crown - 100 cm, · Type 2: - slope of the underside slopes - 1: 1 - width of the crown band - 80 cm. At the beginning and end of each band there will be a wooden palisade made of round logs 10 - 12 cm long 100 cm. At the beginning of the bands (from the water inflow side) there will be cuttings 3.0 m long.