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Oil Ex loration and Production Wastes Initiative Project Methodolo <br />Table 4: Associated Wastes in CA, 1995 <br />Data source: API, 2000 <br />Note: wastes generated by the production of natural gas are not addressed <br />within the scope of this report. Natural gas and hydrogen sulfide gas are often <br />co-produced with the oil. Natural gas is isolated early on in production and <br />marketed as a separate product. Hydrogen sulfide gas is also present in certain <br />formations: it constitutes a waste and is flared or injected into Class II disposal <br />wells alongside other waste fluids. <br />To summarize, the wastestreams sampled during this project were produced <br />water, drilling waste, oily sludges, and workover waste from a foam treatment <br />operation. Table 5 summarizes the wastestreams sampled, their points of <br />generation, and methods of disposal encountered at each facility. The names of <br />the facilities are kept confidential by giving the sites a number 1 through 8 <br />designation. <br />Statewide Com liance Division _ LAay 2202 <br />-15- <br />