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4. Sampling Plan <br />This work plan section describes the procedural and proposed analytical testing program for the <br />investigation. Discrete sampling and analytical testing will be used to characterize the burned <br />refuse and surrounding soils. The sampling will be accomplished using either a track excavator <br />or hollow stem auger drill rig. The samples will be screened using a GMI 422 Gas Surveyor <br />instrument and screened for radioactivity using portable radiation detection equipment. The <br />following describes the proposed sampling plan: <br />4.1. Sampling Methodologies <br />Discrete samples will be collected from the trench excavations and bore holes to characterize <br />burned refuse and adjacent soils. Municipal solid wastes will not be sampled for analytical <br />testing, rather they will be visually classified and recorded on the boring or trench logs. <br />4.1.1. Trench Excavation Sampling <br />Representative samples will be collected during and/or following completion of excavating <br />activities and submitted for analytical testing. The samples will be collected directly into brass <br />sleeves by directly coring the sleeve into the relatively intact soil masses brought to the surface <br />by the excavator bucket. The brass sleeves will be sealed with Teflon tape and caps. Sample <br />depths and locations will be based on visual observations of subsurface materials. If the wastes <br />in the trench excavations are observed to be debris or municipal solid wastes not conducive to <br />sampling and analytical testing, then soil samples will be collected from layers (if present) within <br />these wastes and/or a soil sample will be collected directly underlying these wastes. Burned <br />material, if encountered will be sampled. Sampling will be performed by Ninyo & Moore and <br />CIWMB field personnel. Following completion of trench -related activities, the excavated <br />materials will be placed back into the trench in approximately the reverse order that they were <br />removed. <br />4.1.2. Borehole Sampling <br />Samples will be collected from each boring at approximately 5 -foot intervals or as deemed <br />appropriate based on subsurface conditions to the total depth drilled. Samples will be collected <br />with a California sampler or a standard penetration test sampler lined with brass sleeves. Upon <br />retrieving the sampler from the borehole, the brass sleeves will be separated. The ends of the <br />brass tubes, the sampler shoe, and one to two of the sleeves will be emptied and used to <br />observe and visually identify the subsurface materials. At each sampling depth, one to two of <br />the brass sleeves, to be submitted for analytical testing, will be covered on both ends by Teflon <br />TM sheeting, and sealed with plastic end caps. It is anticipated that one to two samples from <br />each boring will be submitted for analytical testing based on subsurface conditions encountered. <br />The sampler will be driven approximately 18 inches in advance of the hollow -stem auger by a <br />140 -pound hammer falling 30 inches. The blow counts will be recorded for every 6 inches of <br />penetration, the blow counts that will be reported on the logs are those for the last 12 inches <br />of penetration. Soils will be observed and removed from the sampler, classified in accordance <br />with the Unified Soil Classification system (USCS) in general accordance with ASTM D 2499- <br />93, recorded on the boring logs, photographed, and bagged for reference. <br />4-22 <br />