Background: Eligibility, Compare NAAQS and CAAQS and difference in nonattainment areas. Road paving: Describe the process for identifying, justifying, and obtaining ERC certificate, and what stumbling blocks to be aware of.
Real: Actually occurring, implemented, and not artificially devised. Surplus: In excess of any reductions required by rule, regulation, or order. Or SIP. Or proposed by the District in any AQ attainment plan for attaining the annual reduction required by the CCAA. Review federally nonattainment areas carefully to make sure they are surplus. Enforceable: Verifiable and legally binding. Timely: Oftentimes must apply within a reasonable amount of time (6 months).
Xa = 1/n Σ x i Xg = n √x 1 * x 2 * x 3 * x 4 . . .
Source: “Area Designations and Maps – 2001” by CARB
S = surface material silt content, percent Mdry = surface material moisture content under dry, uncontrolled conditions, % P = no. of days with at least 0.01 in. of precipitation per year K = coefficient depending on size fraction; for unpaved roads PM 10 k = 2.6; for PM 2.5 , k=0.38 (for paved roads, PM 10 ; 0.016). A,b,c = 0.8, 0.4, 0.3, resp. The quality rating of the formula is “B” (out of A-E).
Paved road emissions are less than ½ % of unpaved road for same amount of traffic
Mdry = surface material moisture content under dry, uncontrolled conditions, % P = no. of days with at least 0.01 in. of precipitation per year K = coefficient depending on size fraction; for unpaved roads PM 10 k = 2.6; for PM 2.5 , k=0.38 (for paved roads, PM 10 ; 0.016). A,b,c = 0.8, 0.4, 0.3, resp. The quality rating of the formula is “B” (out of A-E). sL = road surface silt loading (g/m 2 ). For “worst case conditions” = 3 (post-winter storm or areas with substantial mud/dirt carryout). For normal conditions, low ADT (average daily traffic < 5,000 vehicles); 0.4.
125 tpy for 1.5 mi of farm access road with seasonal large truck traffic and ¼ mi. of an in-town unpaved road segment with auto/light truck traffic.
Best Available Control Measures Reasonably Available Control Technology
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