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FEB -02-19% 13:24 FROM CA INTEGRATED k1ASTE MGNT TO 912094640138 P.02 <br />A <br />U sti n Road Landfill Fxpansion (39 -AA -0001) <br />December 11, 1995 <br />Page 2 of 5 <br />Y <br />showing the relationship tO the disposal -area. <br />As required by U CCR.18222(f), H_distaaces to the nearest <br />st=CtureS all be identified-,, No distance$ to the <br />nearest structures are identified in Drawings P1 through P4. <br />The distances to and an identification of these structures <br />should be provided. - <br />Excavation Stockpiling Plans,- APPe=d'x B'r Drawing ?2 <br />4 <br />kopendix B, Drawing P2, indicates that the sides Of the <br />borrow pit will have a Maximum Slope Of 1:1- This may cal -'se <br />some slope stabty cIIF nCer7Xs for the -disposal site due to <br />the proximity ofthe borrow Pit, Little Johns Creek, and t1 -_- <br />flood easement zone to the dizposal area. To ensure <br />laiadf ill . slope stability, the slope stability analysis <br />should include the existence of the borrow pit along with <br />Little Jdhns Creek as discussed in the next coment. <br />Surface Drainage Plans -.'Appendix B, Drawings pi, P6, P7 & P8 <br />Appendix D in Appendix I contains the drainage system <br />analysis for a 100 year/24 hour storm event. The analysis <br />is limited to providing the flow contribution to Little <br />,Tohns Creek. The RDS1 sh6uld present the calculations for a <br />j-00 year/24 hour storm event which were used to determine <br />the dimensions of all surface drainage system components, <br />including Little Johns Creek. The flow direction and volume <br />in the drainage structures for the 100 Year/24 hour 8.torm <br />event should also -be indicated- In particular, the creek <br />and flood zone narrow considerably before making a tight <br />right angle tu= on the west boundary of the facility <br />property line. This location may prevent a worse case <br />scenario for erosion and flooding under a 100 year/24 hour <br />storm event..., Any dra ' inage plan analysis should include an <br />ation. <br />-....analysis of this loc <br />Additionally, the proximity of Little aohns Creek and.the <br />flood easement zone may cause s=e slope stabilitY Wnce=z <br />for the disposal site- To ensure landfill slope stabilicy, <br />the slope stability analysis should be performed under the <br />condition of a.i00 year/24 hour storm event, and include the. <br />existen6e of the borrow pit (as discussed in previous <br />comment), Little JOhns creek, and the flood easement zone. - <br />Site Access Plan Appeu4UXX,­­ 2 <br />As required by 14 CCR .17714, (t) raffic'Elow into, on, and <br />out of the disposal' site shall be in accord with the design <br />4ntent and in such a manner so as to minimize possible <br />t - <br />interference and safety problems for traffic on adjacent <br />