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=Palomino <br />Date: <br />May 25, 2005 <br />Project Name: <br />Personnel: John Lane <br />roject Activity: Site Inspection <br />Job Number: 618 <br />Page: <br />1 of 1 <br />John Lane of Ground Zero conducted a site inspection during excavation of debris pits at the southwest corner <br />of the pro eegy. Present at the site were John Lane of Ground Zero, Peter Palomino, Frank Girardi of San <br />Joaquin County EHD, and several laborers. <br />John Lane observed that dust control in the form of water sprayed from a garden hose was being _ap lip 'ed to <br />the excavation zone pursuant to the Site Mitigation Workplan and Workplan Addendum. No visible dust was <br />observed and no run-off from the sprayed water was observed. The pit currently being excavated appeared to <br />have general debris including concrete and a bicycle. Several old fire extinguishers were also found. The <br />extinguishers should be disposed of pursuant to Ground Zero's Memorandum dated May 25, 2005. <br />Excavation from another pit just south of the current dig has been temporarily suspended due to the presence <br />of ash waste in the pit. The ash waste appears to be the result of a small tire burn. <br />Mr. Palomino has indicated that the CounV has requested the followingaction: <br />tion: <br />1. Use a dust fogger for dust control during excavation and loading of stockpiled soil/waste instead of <br />sprayed water as is currently being used. <br />Cease excavation of the ash waste until the new ash waste is characterized for landfill disposal. <br />Ground Zero makes the following recommendations: <br />1. Continue to use spray nozzle and/or water truck for dust control since wetting the material will not cause <br />any disposal or exposure issues This open excavation does not appear to be an appropriate application <br />for a dust fogger. A dust fogger appears to be more appropriate for inside large buildings, such as a <br />landfill transfer station or in segmented surface materials handling systems, such as in the aggregate, <br />crushing, and mining industries. A good overview can be found in Arch Dust Suppression Handbook, <br />published by Arch Environmental Equipment, Inc. (See page 4 of the handbook "Garden Hose <br />Technology"). <br />2. Characterize the new ash waste to determine if it can be handled as non -hazardous waste along with the <br />waste piles currently stockpiled on site. <br />r <br />