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<br />2?L iarch 197$ <br />i•:r. Dale tieam <br />Cooley Gravel Coa~rany <br />P, O. Box $48$ TA - <br />Denver, Colorado <br />Dear !`1r. Dean: <br />-iii iiiiiiu~iiiiii <br />The purpose of -this letter is to sucr.iarize the results of a <br />fuJitive dust suLn~eiliance program as requested in our <br />meeting of 14 bIarch 197$• <br />This program eras directed by Franklin Davis an3 conducted by <br />the Colorado >chooi of Ikines Research institute (project <br />ruriber J20$34; . T!:e surveillance bean on 6 July 1972 aild <br />rata was analyzed on a monthly basis through 13 July 1973. <br />After this tine the program continued on a quarterl~r basis <br />through T+Ia;;r 1974. The sui~veiilance program i•:as conducted <br />according to applicable standards of the A~,erican aociety <br />for Testing Iaterials (n3^i,i Standard D1739-621. `t'his <br />rrxedure used. a lipoid-filled standard bttcY.et, At file and <br />of the sampling period tr_e liquid eras evapcrated and ,he <br />residue r+eighed, from this the dustfall was calculated <br />Dustfall stations erere set-up at boundries of the Cooley <br />property as follo,:s (see figure 1): <br />Station "'o. Station Location __ <br />1 Tlorthern Boundary; ap?ro;~. 10 yds inside <br />northern boundary and apprer„ IF00 yds nest of <br />northeast propert;;r corner <br />2 V7es-cerz Boundary; approx. $ yds inside and <br />midway along the 1316.83 ft line which d..ivic.es <br />the quarry property from the 33.96 acre spur <br />of Denver mountain park property <br />3 Southern Boundary; appro,;. $ yds inside <br />southern boundary and anpror,. $00 yds west of <br />southeast property corner <br />4 Eastern uoundary; approx. 10 yds inside east <br />boundary line and approx.. $GO yds south of <br />nortizeas-t property coiner <br />In the 13 September 1972 report of this surveillance it was <br />stated ti~at: <br />