Regulated Heavy Metal Cumulative Loadinga,b A. Arsenic 37 lbs/acre B. Cadmium 35 lbs/acre C. Chromium 2,680 lbs/acres D. Copper 1,340 lbs/acre E. Lead 270 lbs/acre F. Mercury 15 lbs/acre G. Molybdenum 16 lbs/acre H. Nickel 375 lbs/acre I. Selenium 90 lbs/acre J. Zinc 2,500 lbs/acre (a) This is the maximum sum of all prior loadings to the soil. (b) Compost shall have a pH greater than or equal to 5.5.