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These data are part of the data collected for the California Phase II OCS Monitoring Program of the Santa Maria Basin by Dr. Hyland from Battelle Ocean Science and Dr. Lissner from SAIC spanning the period from 21 Oct 1986 to 08 Mar 1987. As part of this program, physical, chemical and biological data were analyzed to determine the impact of oil/gas drilling and production. Originator's data were submitted on tape which have been copied/migrated to current NODC data storage media. Description of the data in the files follows: File 1 of the originator's tape contains carbonate and total organic data (TOC). File 2 contains salinity, temperature and sigma-t data recorded using a CTD. Files 3 and 4 contain hard-bottom epifaunal data derived from the analysis of photographs taken using a ROV and a description of the epifaunal codes. File 5 contains grain size data. Files 6 and 7 contain data derived from the analysis of infauna samples taken from box cores. Files 8 and 14 contain data location and sample codes for all files. File 9 contains ph, shear stress and redox data derived from the analysis of sediment samples taken from box cores. File 10 contains saturated hydrocarbons derived from the analysis of sediment and pore water data. File 11 contains aromatic hydrocarbons from sediment and pore water samples. File 12 contains trace metal (AG, AS, BA, CD, CR, CU, HG, NI, PB, V, ZN) concentrations in sediments and pore water. File 13 contains data on the activity of radioisotopes (PB 210, TH 228, TH 230, TH 232, TH 234) in sediments. File 15 contains saturated hydrocarbons from tissue samples. File 16 contains the aromatic hydrocarbons from tissue samples. File 17 contains trace metal (AG, AS, BA, CD, CR, CU, HG, NI, PB, V, ZN) concentrations in tissue samples. File 18 contains data on the concentration of 2 to 5-ring aromatic hydrocarbons from sediment samples. File 19 contains water quality data collected using bottle casts. The parameters reported are dissolved oxygen (DO) nitrate, nitrite, PH, phosphate, salinity and silicate. Sample locations and codes can be found in files 8 and 14.