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r� <br />Thelma Kellv A�ril 7, 1982 __ Page 3 <br />property). The <br />of underpinning <br />grade. <br />fireplace may be protected by installation <br />or rakers when the excavation is nearly to <br />6. Earth retaining walls should be designed for an equiva- <br />lent fluid pressure of 35 pcf (level backfill) and 60 pcf <br />(sloping backfilll; they should be backfilled only with <br />free-graining granular material. Adequate foundation <br />drains should be provided behind all walls enclosing sub- <br />grade spaces. <br />7, All below grade spaces should be protected with care- <br />fully designed and constructed foundation drains. These <br />should be of perforated plastic, wrapped with filter cloth, <br />placed in a bed of washed pea gravel, and provided with <br />access risers at strategic locations, to allow periodic <br />maintenance and to verify its continuing function. Under <br />no circumstances should surface water be led into tie foun- <br />dation drains. <br />8. Upon completion of the project, the exposed slo��e <br />should be immediately protected with a fast-growing vegeta- <br />tive cover having a broad leaf and close-knit root system. <br />We shall be p'leased to provide such further assistance as you <br />may need on this project and request that we be notified at the <br />cemmencement of excavation to verify soil conditions and assist <br />in the resolution of any unforeseen difficulties. <br />Very truly yours, <br />� <br />DBG:NHT:nt <br />N, T VJF;` <br />�t i"iSh,� �: <br />�I. I �'t <br />r��• <br />� o <br />\ ''�ST. F-p�i <br />cc: Olson/Walker <br />� NEIL H. TWELKER & ASSOCIATES, INC. <br />�� <br />� � <br />t, r�J . <br />. /��� � b <br />lc�; Neil H. Twelker, Pres. <br />N e <br />