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Oil Exploration and Production Wastes Initiative Project Methodology <br />Based on information supplied by industry representatives, the most common <br />method of disposal for drilling wastes is on-site burial of drilling pit contents after <br />aggregation of the aqueous component with cement. This method has regional <br />limitations and may not be appropriate where drilling fluids other than water- <br />based fluids are used. An alternate method of disposal is shipment to a <br />commercial disposal facility that accepts E&P wastes. Table 2 lists available <br />published data regarding the volume of drilling wastes and methods of disposal in <br />California. <br />Table 2 Drilling Wastes in CA, 1995 <br />IDnllmgwastes <br />. <br />i Barrels Percentage <br />__._.._ _.. -----_v _ __. __._., - _._-_ __ <br />Total estimated volume drilling wastes, solid and liquid <br />_- _ _ .._. _., <br />1 1,826,401.W <br />_ <br />100%111 <br />,Drilling waste produced with freshwater drilling fluid1,789,872.98 <br />98_0%, <br />,Drilling waste produced with oil-based drilling fluid� <br />27 396.02{ <br />1.5% <br />lDrilling waste produced with synthetic drilling fluid <br />9,132.01! <br />0.5% <br />ilEstimated volume of liquid drilling waste disposed by <br />method Barrels . Percentage <br />Evaporate on or offsite <br />347,000.001 <br />19.M: <br />Land spread onsite <br />---------------- <br />? 804,000.001 <br />44.0% <br />;Land spread offsite <br />1,000 001 <br />0.1%1 <br />Reuse for drilling <br />j 22,000.00E <br />1.2%1 <br />;Other <br />256,000 061 <br />14.0%1 <br />Estimated volume of solid drilling waste disposed by method i Barrels Percentage <br />B.uned onsite <br />383,000 00 ' <br />21.0% <br />_.... <br />Land spread onsite <br />�._.__..___......__._ <br />5,000 00; <br />0 3%. <br />__. <br />Land spread offsite <br />2,000 00 <br />0 1%'. <br />lCommer l sal facility .__ <br />4 000 00 <br />0.2%! <br />_._ _a. _ _ <br />ocp landfill <br />ndu municipal __......_ _ . <br />__-- — __ 2,000 00 <br />_0 - <br />_ _ __.._ <br />Other <br />401.00! <br />0.02W <br />Data source: API, 2000 <br />• • - IM -1415611 <br />Sludge waste generally consists of oily sands and untreatable emulsions <br />segregated from the production stream, and sediment accumulated on the <br />bottom of crude oil and water storage tanks. The estimated total volume of oily <br />sludge generated in California during 1995 was 220,300 barrels (API, 2000). <br />Sludge samples during this project were collected from production pits and from <br />the bottom of water holding tanks. Table 3 d' Al's estimation of the <br />number of production pits and tanks associated with production facilities in <br />Statewide Compliance Division May 2002 <br />-13- <br />