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Saml-,)1ing at a location will entail use of the Geoprobe, ,N,,hich will drive a direet-push <br />sampling toot down to rialive soil beneath the old Fill. <br />t3n.der the authoritative sampling protocol. the CLAWMI3 field engineer may change <br />individual samphiig locations based on site-specific field conditions (inclUdif.114 <br />unfioreseen obstructions, visible signs of comarninatcd soils or other factors). CWMB <br />anticipates that appIVXjMaIcIy 3_5 sai-ripling locations will be required to adequately <br />define the horizorit.al and vertical extent cif the fill and covet, thickness (reference FI(.)LI.I'e <br />3). Sail saniples wil I be screened using: a (JIM.1 41-2 (3as SuIrveyorinstrument and also <br />screened. for RldiOaCtiVily LIShig pot -table radiation detection equipment and then sent to a <br />State ofCalifornia certified haZaAlOUS waste laboratory fbraiialysis. The hole created by <br />the (leoprobe direct PLISII sampling equipi-nem, will be screened using a GMI 421- Cias <br />Survevor itistrument, capable o.f.measuring coticentratiotis of hydrogen. sulfide. <br />C, 41- <br />carbon dioxide, oxv,,en and carbon monoxide, II gas concentrations exceed 1.12151,N) during <br />g <br />screening., as sWliples will be taken and analyzed usingT.O.-.1 5 procedures. UTpon <br />I I <br />completion of'sarnplino and loo -Ing activities, direct -push borings vvill be backfilled with <br />bentonite, <br />2.3 Expected Data <br />Chemical coiistituent concentratiort data obLaitied. clueing g this HlVeSti�Mi011 will IV <br />- <br />evaluated to determine H'additional sampling is necessary. Additional sampling may be <br />ped'ornied if it is found that specific cotistitueni. levels exceed hazat'CIOUS levels Specified <br />in 221 (:Clz� C.Ln STIA 6or.L.ead is much ueater Lh.aii 5 m,o/I. Based wi hil'ormation <br />krioivri about the site the 1`61lowing is expected: <br />a) residual concentrations of,' heavy metals such as lead, copper, chro.ine,., <br />nickel, and zinc inay be present in. burn. ash or soil. <br />b) Municipal solid waste is likely to be found on all parcels that %vere subdivided <br />from the <br />ori incl Syiider Dump. <br />C) Landfill gas may be present; concentrations and migration issues are <br />uAnown <br />d) [JSGS topographics maps of' the gravel inining pit shote bottom of <br />VVaSte elCVZlt]OIIS,' VOIUITIC o1 waste should be differciice between bottom <br />of waste elevations and current urade lines. <br />C) Waste, primarilycotistruction and. demolition debris is expected against <br />I =1 <br />the Sante Fe railroad levee, on the, Lane and L.,yiich properties which occurred <br />durI ing illegal disposal activities <br />__ <br />0 <br />