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The PSA report did not include a figure indicating the lateral and vertical extent of wastes based on background information and results of the site investigation. v p ��+vith ltatian C_210 h "hi . This Google Earth Image indicates a square area south of the Pilkington NA building and to the adjacent east of the power plant identified as "Trenching Plan Area Jan 2015." �gu w•n Pian, dar +ct rtitl1 6kIE},,.� r This document consists of Figure 3 — Trenching Plan, and although not known, may be a submittal by AGE to provide additionally requested information related to proposed exploratory trench locations since the above-referenced Google Earth Image only identified the general area of trenching. Comments: This figure identifies in the "Legend" a red outlined area as Estimate[d] Waste Storage Location (Historical) and also what appears to be the same area in yellow lettering on the figure as "Area of Known Impact Waste Hand[e]ling." It is likely the area identified in yellow lettering is the same as the red outlined area identified as waste storage. The nomenclature of this waste disposal area east of the power plant is differently in the same document and it appears also on the figure, as well as other documents related to this project making it difficult to understand the Project. It is recommended that the same nomenclature referring to waste disposal be used. Twenty-three trenches are shown on the figure, all oriented north-south except trench T13 which is oriented east-west and parallel (as opposed to perpendicular) to the assumed waste disposal area. To delineate the lateral extent of wastes, trenches should be located at (not within) the assumed waste disposal area perimeter and they should be oriented perpendicular to the assumed waste disposal area boundary. More specifically, trenches T1 to T4 should be located at the assumed eastern waste extent and oriented east-west and not north-south. Similarly, trenches T21 to T23 are located east of the assumed western lateral extent of waste rather than at the assumed western boundary and why are they parallel rather than perpendicular to the assumed waste boundary? Only one trench T-13 is located at the assumed southern waste boundary and it is oriented in the wrong direction (it should be north-south and perpendicular, not parallel to the assumed waste boundary). Trenches T1, T8, T17, T18 and T23 should be located at the assumed northern waste boundary. The trench locations appear to have just been placed on the figure, with the same generally north-south orientation without regard to delineating the suspected lateral extent of waste based on the area identified on the figure as"Estimate[d] Waste Storage Location" and "Area of Known Impact Waste Hand[e]ling" and historical aerial photographs. Only borings AB8 to AB21 are indicated on the figure and AB1 to AB7 should also be shown. The blue-white gray materials stockpiled at some locations appear to possibly be mixed with soils. This material needs to be identified and whether it is a potential environmental concern. Are these materials related to glass manufacturing or are they waste products associated with the manufacturing process? Ninyo&Moore 1 500 E.Louise Avenue,Lathrop,San Joaquin County,California 1 104690095 1 August 11,2017 24