Technologies and Costs for Removal of Arsenic From Drinking Water

systems could underestimate the need for roads and fences at some entry points. Therefore,the 18% without treatment from the 1,001 - 3,300 category was applied to the four largersystem categories. The following table summarizes the percentage used for each of the sizecategories.Table D-3Assumed Percentage of Ground Water Systems with No TreatmentPopulation CategoryPercentage of GWS w/o any Treatment25 - 100 43%101 - 500 19%501 - 1,000 16%1,001 - 3,300 18%3,301 - 10,000 18%10,001 - 50,000 18%50,001 - 100,000 18%100,001 - 1 MIL 18%Thus, the cost of a road and fence was calculated and 43% of that total was included in the unitcost for activated alumina for systems serving between 25 and 100 people.13. The equation for process area, which is the key variable in estimating the costs for buildings,roads, and fences has been based on the design flow of the system. The equation used forprocess area is:Process Area = 726.6 * Design Flow + 59Basis. The basis for the cost equations for buildings, fence and road are described in Section4.0 of the Very Small Systems Document (10). The Very Small Systems Document providedcosts as a percentage of the capital costs for design flows from 0.024 to 0.65 mgd. Theprocess area was calculated from the building cost estimates by dividing by 40 (building costsD-8