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The mean annual pan evaporation for Lodi measured from 1948 to 2002 was 64.92 inches (Western Regional Climate Center). The mean monthly evaporation ranged between 0.06 inches in December and 10.60 inches in July. These values can be adjusted by multiplying by 0.7 or 0.8 to more closely estimate the evaporation from natural surfaces. 4.6.5 RunenRun-on and lRunoff Volume and /Pattern The natural topography of the Foothill Landfill area controls runenrun-on onto the site, with the refuse fill generally at a higher elevation than the surrounding soil - In addition, the active fill area is a significant distance from the property boundary, so Funen +rite refuse fill from SUFFOUnding PFOpe Ftg a idproviding area for drainage features to channel water away from the landfill. To control runoff, a perimeter ditch surrounding the landfill directs storm water rye##into various storm water basins, the largest of which is a peFmanent sedimentation basin on the east end-side of Module "I" of the site (Figure XX2). Overflow of this basin has not occurred to the knowledge of the County. The sedimentation basin aGts as an infiltFation pond. RunenRun-on near the active area is diverted to a sedimentation area that islocatedjust southeast of Module 1 (f„+„ro Ma dulo 'Figure XX2). If this sedimentation area overflows, the water flows overland through grassland to the water pond on landfill property (Plate2.2).. This sedimentation area-did-net eueFfle , in the winter„f 2004/2005.. Water leaving the landfill property along this route is sampled for National Pollution Discharge Elimination System requirements. 4.6.6 DFaonaqe Des*qn Pattem move to "Grad Planned dFainage features feF the developed site (Site Development Plan (SIDP) On Appendix G) weFe sized using a peak flow frern a 100 yea GGGUrrenGe stoFm. The Ratmenal Method was used foF design. With this Foothill Sanitary Landfill Page 29 Public Works/Solid Waste Joint Technical Document _�_,cF._ _- County of San Joaquin-Revised 7/30/10