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Field Investigation: SSI - Phase One <br /> • steel bailer was Iowered through the rod to collect depths and in similar g p i soil types In addition,one <br /> a groundwater sample The bailer was then sample(HP-3SE)was analyzed for selected <br /> retrieved and the groundwater sample decanted physical properties including total organic carbon <br /> into laboratory supplied sample containers The (TOC), bulk density, moisture,and porosity <br /> process was repeated until adequate sample <br /> volume for the required analyses was collected <br /> Sample containers were labeled and placed in a <br /> chilled ice chest for transport along with a <br /> completed chain-of custody form to a state <br /> certified analytical Iaboratory <br /> All sampling rods and the sampling toot were <br /> steam-cleaned prior to use in order to minimize the <br /> potential for contamination The completed <br /> borings were tremie-grouted with a neat <br /> cement/bentonrte slurry to grade under the <br /> direction of an HLA field geologist and in the <br /> presence of a PHS/EHD inspector <br />' ANALYTICAL PROGRAM <br /> Thirteen soil samples and seven Hydropunch <br /> groundwater samples were submitted for analyses <br /> in accordance with the approved analytical <br /> program Samples were analyzed for TPHg with <br /> EPA Method 8015B and for BTEX constituents <br /> with EPA Method 8020A In addition, at the <br /> I request of PHS/EHD, and as documented in <br /> HLA's Work Plan Addendum(BLA, 1998a),one <br /> soil sample(HP-2SG)and one Hydropunch <br /> groundwater sample(HP-2WA)were analyzed for <br /> the RWQCB list of five oxygenates and 1,2-DCA <br /> with EPA Method 8260B <br />' In accordance with the approved scope of work <br /> (HLA 1998a),and because insitu biodegradation is <br /> the preferred(most cost effective) remedial <br /> 1 alternative for low-risk petroleum hydrocarbon <br /> UST sites, analytical data that assess the efficacy <br /> of passive bioremediation as a viable remedial <br />' alternative for the site were collected Plate counts <br /> of the total indigenous heterotrophic microbial <br /> population and the subset of hydrocarbon utilizers <br /> were performed on two samples at HLA's <br /> bioremediation laboratory in Novato,California <br /> The purpose of the plate counts was to <br /> demonstrate the appropriate range of cell densities <br />' to support insitu biodegradation One sample(HP- <br /> 3SE)contained TPH-impacted soil and one sample <br /> (HP-3SF)was representative of non-impacted <br />' soils These samples were collected at similar <br /> L 1300001387371WP138737N19 Harding Lawson Associates 'i <br />