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Lodi City Landfill November 16,2011 North of Awani Drive,Lodi,California Project No. 104690061 11.1. Proposed LFG Monitoring Well and Exploratory Trench Locations Ten borings are proposed to be drilled and completed as LFG wells LFG-1 through LFG-10. Based on background information,there appear to be two issues that will likely constrain the proposed LFG monitoring well constructions. • Based on review of previous boring logs, anticipated depth to water, presence of the Mokelumne River adjacent to the site, and information obtained from the site recon- naissance, it is likely that the total waste depths will be close to and at some locations, likely greater than the depth to groundwater at the proposed LFG well locations. The anticipated shallow depth to groundwater at some proposed LFG well locations will re- strict the total depths the wells can be drilled/constructed. • Because the Lodi City Landfill comprises the majority of a "peninsula" south of the Mokelumne River, at some proposed LFG well locations, there may not be any areas that outhe the waste footprint, so constructing a CCR Title 27-compliant LFG well out- lying the waste footprint may not be possible. Furthermore, residences are constructed immediately south and southeast of the landfill (north and northeast of the intersection of Awani and Mokelumne River Drives) and based on background information appear • to be immediately adjacent to or possibly overlying wastes, also making it difficult in this area to construct the proposed LFG wells at locations outlying the waste footprint. Ten exploratory trenches are proposed at this time and it its possible that one to two addi- tional trenches may be proposed when access is provided to the private gated River Pointe community. The additional exploratory trenches will be identified at the same time the pro- posed LFG monitoring well locations and exploratory trenches are marked in the field for utility clearance. Excavating exploratory trenches is typically the best way to evaluate the presence of wastes, waste extents, thicknesses, and characteristics; however, due to the pres- ence of residential developments southeast and south, and railroad tracks and residential structures west of the City of Lodi Landfill, locations that can accommodate backhoe exca- vating equipment are limited. In general, the exploratory trenches west of the City of Lodi Landfill are located in areas that appear to be accessible based on Google earth maps and will be used to obtain information about whether wastes were disposed of in this area. It is likely that while in the field, the number of trenches and some of the proposed trench loca- tions may be modified, from those shown on Figure 7 due to field observations and conditions encountered during excavation as well as results from earlier trenches. 104690061 R Sng.&o 23 N/m/a-*uuce