EXAMPLE 6. Family Population from the Anticipated Work Force 

 in an Impact Study of a Platform Fabrication 

 Yard. (Source: Reference 18) 



Some Brown & Root employees would be part of families, others 

 would be unmarried. Marital and family status of the Brown & Rpot 

 workers living and working in Northampton County is assumed to be- 

 the same as the general Virginia population under 65. In - 

 1970, 77 percent of the Virginia population under 65 were in families. 

 The remaining 23 percent lived alone or in rooming houses and other 

 group quarters. 



Using these same proportions, Brown & Root would have 694 

 workers in families and 206 single individuals. The 694 workers 

 in the families are assumed to comprise 625 separate family households 

 because of the possibility of both husbands and wives working. 



Approximately 150 of the 206 individuals are assumed to be 

 living alone. The remaining 56 are assumed to be living in rooming 

 houses or boarding with local families. 



Applying the same assumptions to the 200 workers in the industries 

 supported by Brown & Root would mean an additional 138 families and 

 46 single individuals, 33 of whom will be living in separate 

 households. 



In 1970, the Commonwealth of Virginia contained 3.57 persons per 

 family unit; Northampton County contained approximately 3.6 persons 

 per family. Based upon a national ratio of 3.5 persons per family, 

 an additional 2,923 residents, distributed among 763 family units 

 and 250 individuals would be expected in Northampton County. 

 Northampton County population would then total approximately 16,000 - 

 a 15 percent increase over 1970 and close to the county's 1950 level. 



2.3.7 Total Population Added 



Total population added is obtained by adding the estimated number of 

 new resident employees without families, and the estimated total population 

 of new resident families. An example of the calculations required to 

 determine total population added is presented in Figure 5. This example 

 applies the format laid out in Figure 2. It is based on a hypothetical 

 direct employment of 1,000 workers. Assumptions and resultant numerical 

 values are noted for each step. It is critical to remember that the 

 ratios, multipliers, and factors all vary widely, and therefore numerical 

 estimates will also vary greatly.. 



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