The emplacer should consider all risks and weigh them

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Unformatted text preview: ith the basic considerations of suitability and accessibility. DRAINAGE D-38. Drainage considerations include the elevation of the site and type of soil. The importance of good drainage makes a site on high ground preferable unless other factors rule it out. Moisture is one of the greatest natural threats to the contents of a cache. Swamp muck is the most difficult soil to work in. If the site is near a stream or river, the emplacer should ensure that the cache is well above the all-year high-water mark so that rising water does not uncover and wash away the cache. GROUND COVER D-39. The types of vegetation at the site will influence the emplacer’s choice. Roots of deciduous trees make digging difficult. Coniferous trees have less extensive root systems. In addition, the presence of coniferous trees usually means that the site drains well. Does the vegetation show paths or other indications that people visit the site too frequently for secure caching? Can the emplacer easily restore the ground cover to its normal appearance after burial of the cache? Tall grasses reveal trampling, but the emplacer can easily replace an overlay of leaves and humus that effectively conceals a freshly refilled hole. NATURAL CONCEALMENT D-40. The vegetation or the surrounding terrain should offer natural concealment for emplacement and recovery parties working at the site. Planners should carefully consider seasonal variations in the foliage. TYPES OF SOIL D-41. Burial in sandy loam is ideal because it is easy to dig and drains well. Planners should avoid clay soil because it becomes sticky in wet weather and too hard to dig in dry weather. 30 November 2010 TC 18-01 D-7 Appendix D SNOWFALL AND FREEZING D-42. If the personnel must emplace or recover the cache in winter, data on the normal snowfall, the depth of ground freeze, and the usual freeze and thaw dates will influence the site choice. Frozen ground impedes digging and requires additional time for burial and recovery. Snow on the ground is especially hazardous to the burial operation. It is almost impossible to restor...
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