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Title: River Tamar EC dangerous substance directive failure 1993 : final draft report
Author: Tim Geatches
Document Type: Monograph
Annotation: EA additional title info: environmental department cornwall area - final draft report - river tamar ec dangerous substance directive failure 1993
The River Tamar downstream of Hingston Quarry discharge (R12E042) failed for dissolved copper (standard = six microg/l annual average) in 1993. Routine monitoring sites and dissolved copper concentrations are shown in appendix 1. In 1993 dissolved copper concentrations steadily increased from Horsebridge (R12E002) to Gunnislake Bridge (R12E003). The lower reaches of the River Tamar passes through an area of historic mining. Drainage from adits and mine spoil heaps contributes substantially to dissolved copper concentrations in the River Tamar. The annual average dissolved copper concentration upstream of Hingston Quarry discharge (R12E043) was equal to the EC directive standard for 1993. Downstream of Hingston Quany discharge (R12E042) seven of the twelve samples exceeded the EC directive standard in 1993. Hingston Quarry discharge was known to have been operating on two occasions, not operating on two occasions and no record was available on the other three occasions.
Publisher: National Rivers Authority
Publication Date: 1995
Publication Place: Exeter
Subject Keywords: RiversCopperDrainageQuarryingDangerous substancesWater quality
Geographic Keywords: TamarTamar catchmentGunnislake
Extent: n.p. [9]
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