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*B. <br /> Soil sampiEs wiIj be cbtained at 5 foct inter a is . Some cine mous <br /> samplingmay to done in Ona of the first borings to determine where <br /> the soil/groundwater interface exists, Soil Samples will be <br /> collected bl, advancing tea; boring to a point lust above the <br /> sampling depth, then_ driving a California--.modiii.ed, split-spoon <br /> sampler containing brass sleeves through the hollow center of the <br /> auger into the soil . The sampler is driven 18 inches with a <br /> standard 140 pound hammer repeatedly dropped approximately 30 <br /> inches. The number of blows Needed to drive the sampler for each <br /> successive 5 inches will be recorded to evaluate the relative <br /> consistency of soi?_ . Sampling equipment aril' be cleaned between <br /> each use with an A1corox mash followed by a potable water rir.su . <br /> The b.r_as-s sleeves containing so! ! _,samples sEj ecte6 tai- analysis <br /> will he r emovet from rhe sampler er a d the encs covered ered 4} itt? teflon <br /> ".ape, or aluminum foii , and plasnis end caps. The samples will be <br /> labeled, and promptly placed in iced storage, for -transport to the <br /> laboratory. Chain--of-Custody recorns will be maintained at the <br /> site and accompany the samples to a California State-certified <br /> laboratory for analysis. Samples will be :analyzed for TPH- <br /> gasoline, TPH-diesel and BTEX. <br /> The total depth of each boring is projected to be 15 to 20 feet <br /> bras . Field conditions ( confining layers, suspected areas of <br /> contamination) will be, evaluated prior to the completion of <br /> drilling. one nrar water sample from each boring will be collectf'':J <br /> at, tota .. depth. Groundwater will bre Transferred to the appropriate.!caboratcry +in supplied containers for analysis . The samples will <br /> be labeled, recorded on a Chain-of--Custody and storey on .ice: prior <br /> to transport to laboratory. The water samples will be analyzed :dor <br /> TPH-gasoline, TPH--diesel and BTEX. <br /> After sampling is completed, each soil boring will be backfilled <br /> with grout tremied from total depth to surface . Neat cement or a <br /> cement/bentonite grout mixture will he use l. Soil cuttings wili <br /> be sampled and disposed of by integrated Ti,astestream Management. . <br /> i:dater used to iecontam.ina;.e augers will be drummed .and sampled <br /> n• i cr to disposal , <br /> 3 . 4. 2 Monitoring Well installation <br /> Four monitoring wells will be drilled t:3 an approximate depth of <br /> 20 feet bgs using a truck--mounted 8-inch diameter hollow-stem auger <br /> drilling rig. Soil samples will be obtained every 5 feet using a <br /> spilt-spoon sampler for lithologic and chemical analysis. Samples <br /> will be collected in clean, brass sample sleeves, covered on both <br /> ends with either teflon tape or aluminum foil .ln,a sealed `a*itis <br /> plastic end caps , The samp!Qs will be labeled, placed in c+ co3ler- <br /> with ice and transported tc. :a State-certified laboratcry . Samples <br /> wilt e anal f-' m -n T sel and LTEZ. <br /> vV L"1 analyzed �.r 1.F'1"I yaS )_..k't!_.� _l�t�'-dl.e� , <br /> The monitoring wells will he ccnstructen using 2-inch diameter, <br />