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<br />business district was attributed to the fact that there was very <br /> <br /> <br />little land disturbing activity in a downtown area and the solids <br /> <br /> <br />buildup rates were reduced by street sweeping practices. <br /> <br /> <br />(3) Phosphorus levels were closely associated with the <br /> <br /> <br />suspended solids concentration, and generally increased with <br /> <br /> <br />increasing levels of suspended solids. One exception, the low <br /> <br /> <br />activity rural land, exhibited the lowest peak suspended solids <br /> <br /> <br />concentration but the highest peak phosphorus concentration, <br /> <br /> <br />probably due to increased use of fertilizers. <br /> <br /> <br />(4) The peak lead concentrations increased with increasing <br /> <br /> <br />impervious area and vehicular traffic and appeared closely <br /> <br /> <br />correlated to the suspended solids level in the runoff. <br /> <br /> <br />: As a part of their study, Sartor and Boyd (1972) measured <br /> <br /> <br />the difference in total solids loadings as a function of land <br /> <br /> <br />use type. Their results are shown in Table 17. <br /> <br />E. Total Pollutant Loads <br /> <br /> <br />Several investigators have reported results in terms of <br /> <br /> <br />pollutant yields (lbs/in/acre) and total pollutant contributions <br /> <br /> <br />(lbs/acre/year). Expressing results in this manner is useful <br /> <br /> <br />in determining the relative long term influence of urban storm- <br /> <br /> <br />water runoff on water quality in relation to other pollutant <br /> <br /> <br />sources. <br /> <br /> <br />Weibel, Anderson, and Woodward (1964) computed loadings on <br /> <br /> <br />a pound/acre/year basis for several of the constituents that <br /> <br /> <br />were found in the stormwater runoff from their test site in <br /> <br />38 <br />