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5.4 QUANTITIES OF HOUSEHOLD HAZARDOUS WASTES <br /> �- In 1986, an estimated 549 tons of household hazardous wastes (HHW) <br /> were generated in the County (Table 5-10) . <br /> The 1986 HHW estimates were based on: <br /> • A HHW characterization study in Marin County, California <br /> • Planning data on the number of households in San Joaquin <br /> County in 1986 <br /> • Estimated composition of household hazardous wastes <br /> described in HHW characterization studies for Marin <br /> County, California and New Orleans, Louisiana <br /> • Conversions developed by DHS relating HHWs and waste <br /> groups <br /> To date there have been few carefully structured studies that have <br /> estimated quantities of HHW generated per capita. Data obtained from <br /> 1-day collection events tend to be misleading because the quantities <br /> typically reflect storage rather than generation. However, the Marin <br /> County, California and New Orleans, Louisiana studies upon which the <br /> Plan estimates are based, focus on HHWs generated by households on a <br /> regular basis rather than on quantities stored in a garage or under a <br /> kitchen sink. <br /> The following steps were taken to develop the estimates for the 1986 <br /> household hazardous waste generation: <br /> 1 . A unit factor of 7.41 pounds per household per year for genera- <br /> tion of HHW was obtained (W.L. Rathje, et. al . , July 1987) . <br /> 2. The unit factor was multiplied by the number of households in San <br /> Joaquin County in 1986 (147,983 households) to yield 549 tons of <br /> household hazardous wastes generated in 1986. (Source of data on <br /> number of households: State of California Department of Fi - <br /> nance. ) <br /> 5-12 Rev. 1 11 08 88 <br /> PJ9 93905020.00D / / <br />