Laserfiche WebLink
INTEROFFICE MEMORANDUM <br />TO: ERICA CROSBY <br />FROM: DAVID BIRD -SENIOR GEOCHEMIST <br />SUBJECT: CEMEX, LYONS QUARRY, M-1977-208 <br />DATE: 10/5/2007 <br />CC: CARL MOUNT <br />Following are my comments on the Recommendations (Section 5) submitted 31 August 2007 by Brown <br />and Caldwell as part of Technical Revision No. 8 for the CEMEX Lyons Quarry. <br />Reduction of sampflng frequency for C-Pit Water from quarterly to semi-annually <br />Due to the history of constituents in pit water and ground water at concentrations exceeding regulatory <br />limits, DBMS should requite at least five quarters of analyses with results below regulatory limits before <br />approving this proposal <br />Eliminate dissolved thallium and chloride from the analyte list <br />Because of the history of thallium and chloride detections at the site, eliminating thallium and chloride <br />from the analyte suite would be premature. Thallium and chloride are regulated parameters, and should <br />therefore be analyzed for five quatrers, with results below regulatory limits, before DRMS approves their <br />removal from the analyte suite. <br />Continue to monitor the water level in C-Pit <br />Agree. <br />Reduce the sampling frequency for monitor well CEM-001 <br />Because of the existence of multiple parameters historically exceeding regulatory limits both in pit water <br />and in ground water, DRMS should recommend that quarterly sampling continue. <br />Monitor the water level at compliance well CEM-005 semi-annually. <br />Fot the reasons stated above, compliance welt CEM-05 should be sampled quarterly as welt. <br />Sample alluvial well CEM-004 semi-annually and analyze for selenium, sulfate, total dissolved <br />solids, and pH. <br />For the reasons stated above, well CEM-004 should be sampled quarterly, and thallium should be added to <br />the suite of analytes. <br />