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��� <br />o�x <br />C", H <br />9 H fn <br />4 <br />H � <br />tC C] <br />H 7a <br />�H� <br />C/� H <br />zp <br />H <br />OHd <br />��g <br />(�] Y (q] <br />�HL�1 <br />HH <br />8� <br />o�� <br />�H� <br />H O CA <br />' <br />� <br />� <br />; t <br />Thelma Kelly April 7, 1982 Pave 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 />(slopi,nq backfill); they should be backfilled only with <br />free-ffraininq granular material. Adequate foundation <br />drains should be provided Uehind 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, wrapoed with filter clbth, <br />placed in a bed of washed pea g:avel, and provided with <br />access risers at strategic locations, to allo�r periodic <br />maintenance and to verify its continuing function. Under <br />no circumstances should surface water be led into the foun- <br />dation drains. <br />8. Upon completion of the project, the exposed slone <br />should be immediately protected with a fast-growing vegeta- <br />tive cover having a broad leaf and close-knit root syste��i. <br />We shall be pleased to provide such further assistance as you <br />may need on this project and request that we he notified at the <br />commencement of excavation to verify soil conditions and assist <br />in the resolution of any unforeseen diEficulties. <br />DBG:NHT:nt <br />cc: Olson/Walker <br />Very truly yours, <br />NEIL H. TWELRER � ASSOCIATES, INC. <br />b J'�/ ' <br />Neil H. Twelker, Pres. <br />