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Activities Potentially Resulting in Impacts 



First Priority - drilling muds and cuttings, produced waters, produced sands, spills (crudes and refined 

 materials), the physical structure of the platform itself, structure removal, fish population displacement, 

 and synergistic effects; 



• Second Priority - deck drainage, anodes and anti-fouling materials, domestic/sanitary wastes, pipelines 

 (metals & test fluid), geomagnetic disturbance (fish navigation), noise, completion/work over fluids, and 

 trash; 



Third Priority - air impacts, hydrostatic test materials, and sand blasting/paint chipping activities. 



Parameters to Measure 



• Physical - water, produced waters (composition, verify mixing models, examine microlayers, etc.); 



• Biological - benthic communities only, water column work should be avoided except in specific cases 

 such as resident fish communities associated with a structure; 



• Chemical - standard parameters; 



• Miscellaneous - analysis of all discharges. 

 Effects and Parameters to Measure 



• Chemical - While it first appeared that the parameters to be examined were a repetition of past work, 

 these previous studies dealt almost exclusively with short-term, acute stress. These same parameters may 

 now require re-evaluation in terms of long-term, chronic stresses and effects thereof. 



Metals - selected metals should be examined as to their toxicological effects as well as their potential 

 use as tracers. 



Barium - a major component of drilling muds and possibly be a particularly good tracer; 



Mercury - found in drilling muds, sacrificial anodes, and some paints, and often in pipe dope; Zinc - 

 pipe dope, sacrificial anodes; 



Miscellaneous - Chromium, Cadmium, Copper, Arsenic, Tin, Vanadium, Nickel 



Radionuclides - particularly the radioactive isotope of barium which has been previously used as a tracer. 



Silicon (i.e. silicate) and sulfur - may have use as indicators of primary production and deposition. 



Organics - Polynucleated aromatics (PNA's), naphthalenes, dibenzenes, benzene, heterocyclics, 

 lignosulfonates and their derivatives (it was pointed out here that they are not very sensitive because they 

 are extremely difficult to detect), steranes-triazanes, petroleum hydrocarbon ratios, isopenoids, and the 

 total organic content, Carbon/CaCOj ratio, bactericides, and treatment chemicals. From the 

 toxicological point of view, alkalated analogs, particularly the ratios of specific position isomers 

 (standards are now available for such new techniques), were also added to the list of organic compound 

 which should be considered. With the interest in microbial processes the nutrient content (e.g., 

 phosphate and nitrate) of the interstitial waters will also need to be examined. 



• Physical Parameters - Benthic 



Standard Measurements - sediment shear strength; mineralogy; total organic carbon; interstitial waters; 

 REDOX potential/discontinuity layer; isotopes, particularly short-lived species (e.g., Radium, Thorium) 

 in the sediment which may be of value in examining mixing rates and fluxes; and grain size distribution 



