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April 2014 26 10381640A <br />contact with the CKD from area A2 is currently being monitored in the other downgradient <br />wells. <br />Furthermore, based on the low hydraulic conductivity and slow groundwater velocities of the formations <br />beneath the Site, it is concluded that CKD leachate migration to the eastern permit boundary would <br />require more than 450 years, even without accounting for constituent sorption by bedrock materials. <br />Therefore, CKD leachate will not travel beyond the permitted boundary or be received by any off -Site <br />receptors for centuries, if ever. <br />Based on these findings, Golder recommends that: <br />1. Site reclamation liability be released based on groundwater considerations; <br />2. Holcim and the DRMS discuss possible additional groundwater monitoring at the Site for <br />information purposes, but not based on site reclamation liability requirements; <br />3. If Holcim and the DRMS agree on additional groundwater monitoring at the Site for <br />information purposes, then implement annual sampling of Site groundwater monitoring <br />wells; and <br />4. The analyte list be modified to only include alkalinity, chloride, pH, TDS, sulfate, and <br />dissolved barium, boron, calcium, iron, magnesium, manganese, potassium, and sodium <br />in a possible informational groundwater monitoring program. <br />GOLDER ASSOCIATES INC. <br />/ara Harkins <br />Project Geologist <br />4. ✓Y! 4A-4 C.r <br />Randy March, P.E., P.G. <br />Principal Geological Engineer <br />SH /JA/RM /ds <br />t <br />n <br />Jroe -Alexa <br />ject Scientist <br />is \10 \81640a\ 0400 \g\ har ilinstallfieldrep _fnl- 30apr14\10381640a gmharrpt _holcim- boettcher_fnl- 28apr14- wth holcim edits. docx <br />Golder <br />Associates <br />