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02.7.2019 <br />Memo <br />This typo has been corrected <br />Pg.02 <br />4. Please correct "typo" on revised page 2.05-75. The first sentence following <br />Table 2.05.4-5, starts out, "In Phase ID". The Division believes that this should <br />read, "In Phase III". <br />This typo has been corrected. <br />5. LCC is proposing a cover standard of 500 stems per acre on areas considered to <br />be shrub plots. On revised page 2.05-72, LCC commits to sampling a <br />minimum of 3 shrub plots. Please define how large these shrub plots are <br />anticipated to be. The permit system shows that 129.3 acres of disturbance <br />remain in the Lorencito Mine Permit area. The Division suggests that the <br />shrub lots represent some percentage of the reclaimed area. Five percent of the <br />disturbed area would be 6.5 acres, ten percent of the disturbed area would be <br />12.9 acres. LCC needs to state how much area will be considered within the <br />shrub plots for sampling purposes. <br />NECC provided an appropriate response. NECC commits to sampling shrub <br />plot areas will comprise between 5 to 10% of the total disturbed area. The <br />Division concurs with the commitment and sampling methodology. <br />6. On page 2 of the Arcadis Sampling Plan, dated May 2, 2018. The Division <br />finds an error in Equation 1: The denominator should read (d*Xmean)Z [my <br />keyboard will not allow me to enter X with a bar for sample mean] Rule <br />4.15.10(2)(a). Please assure that Arcadis uses the correct formula as shown in <br />Rule 4.15.10(2)(a) for determining sample adequacy. <br />This equation has been corrected in the Arcadis June 2018 sampling plan <br />description. <br />NECC has adequately responded to the Division's May 23, 2018 preliminary <br />adequacy concerns. <br />