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0 . environmental concerns were identified related to petroleum hydrocarbons, possibly waste water treatment, an oil spill, former LISTS (closure information not available). Discolored apparently stockpiled blue-gray white materials could possibly be an environmental concern and these materials should be identified on the figure. East of the buildings the surface appears disturbed and is labeled"SILOS [SOILS]. 6,60 East Loiuise Avel�ste, ema1�'��6iI��c�ncC��e�r�m,��to th "e, This email from AGE to the LEA stated that minor volumes of debris were observed "in the trench section" typically at depths of four feet or three feet, with a thickness horizon of less than six to eight inches. AGE stated that they found "no big items or locations without the presen[ce]ts of a native soil base under the spilled glass waste." They stated that glass was the majority of the waste, with some "bit or strings of plastic excavated." AGE stated that "This section is what was observed in the Geoprobe soil boring logs (photo attached)." Comments: Although photographs are indicated as initially attached, they were not available for review in this chain of emails. The email suggests native soils were encountered underlying the soils; however, trench logs to confirm this were not available for review. Did all exploratory trenches extend to "native soils"? If this was the case, then the trench logs need to indicate this important information. 564 East pindiene fromAGE tc�t � The email from AGE to the LEA states that they have received the soil sample analytical data from the trenches and soil piles from the SWIS site at 500 East Louise Avenue in Lathrop and that attached is the site plan and raw analytical data from the investigation. AGE stated: "As noted most every trench (T samples) were analyzed for metals, most for pH and others for VOC and other chemicals. Noft]much of any were detected. The soil piles samples (S samples) were also analyzed at your offices request. Most soil piles were non detected for VOC and other chemicals. One location did have elevated metals, however this "set of piles" would be profiled for local disposal at Forward Landfill. Map of the trenches attached." Minor volumes of debris were observed in the trench section, typically at depths of four feet or three feet, with a thickness horizon of less than six to eight inches. AGE found no big items or locations without the presents of a native soil base under the spilled glass waste. Glass was the majority of the waste, with some bit or strings of plastic excavated. This section is what was observed in the Geoprobe soil boring logs (photo attached next email). AGE plans to backfill the excavation with a soil mix borrowed from the field east of the former SWIS area. I will inform your office. Additionally the soil will [be] piled and profiled for disposal/landfill. Comments: as previously stated, it is not required to backfill exploratory trench excavations related to investigation of a waste disposal site with imported fill soil, rather the excavation can be backfilled with materials removed from that location in the reverse order excavated. This email may have just been an update to the LEA, as opposed to later providing additional data; however, at a minimum, analytical data should be tabulated onto tables and compared to appropriate regulatory and/or hazardous and/or screening or human health levels appropriate to the Project. A site plan with boring and trench locations, presence or absence of wastes and waste thickness needs to be provided. At a minimum, boring and trench logs should be provided to document this information. Also, it is not clear whether all stockpiled materials were proposed to be disposed of at the Class 11 Forward Landfill? Ninyo&Moore 1 500 E.Louise Avenue,Lathrop,San Joaquin County,California 1 104690095 1 August 11,2017 30