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n <br />C <br />Oil Exploration and Production Wastes Initiative Project Methodolody <br />be involved in the regulation of E&P wastes (IOGGC, 1993). <br />.. - <br />The primary data quality objective of the study was to collect and analyze <br />samples that would be representative of the wastestream as a whole. To that <br />end, SCD employed a sampling strategy based on scientific principles outlined in <br />U.S. EPA's -Test Methods for Evaluating Solid Waste, Physical/Chemical <br />Methods" publi tion SW 646, 3`d edition, 1996. Samples collected were <br />adequate in terms of number and volume, field blanks were collected at a rate of <br />10% of the total number of waste samples collected, and all quality assurance <br />procedures established for each test method were followed. Statistical analyses <br />of the data were also completed and those findings are included with the <br />discussion of results in this report. <br />2. Site selection criteria <br />E&P waste samples were collected at six oil production facilities in Los Angeles <br />County and two oil production facilities in Kern County. Although the sampling <br />sites were selected by SCD, participation in the study by each facility took place <br />on a voluntary basis. <br />Sampling sites in Los Angeles County were of interest to DTSC due to their <br />location in highly populated business or residential districts, and their proximity to <br />public schools. Due to concerns regarding potential impacts of E&P wastes on <br />children's health, DTSC selected for sampling facilities that produced oil (and <br />therefore E&P wastes) within a quarter of a mile distance of a public school. <br />Whenever possible, the sites were selected from different oil fields, to help <br />diversify the sampling points. <br />In general, oil production facilities sampled in Los Angeles County were small- <br />scale oil producers, occupying one or two blocks, and producing oil from older <br />reservoirs by making use of waterflood, a type of enhanced recovery operation. <br />By contrast, facilities sampled in Kern County are representative of large-scale oil <br />production. These facilities were selected based on their diversity of operation <br />and availability of wastestreams of interest. General features included: extensive <br />areas of operation in a rural -type setting, on-site recycling of certain types of <br />wastes, and use of enhanced oil recovery by steam injection, a process known <br />as steamflood. <br />Statewide Com liance Division,., Mav 2002 <br />WE <br />