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z 7-70-1998 d-0]PM FROM AVALON ENV IR N I At- r I a CX4" -r-'"" <br /> reartaiirhirtg eleven br rinP wl.11 be aged at various locations throughout the site 1� up gradient and <br /> dowry gradient to dOeMAe�iie eaeterrt sof groundwater impact. The depth to groundwater hasbbeen. � <br /> descri,W by previous investigators as between 6 and 12 feet bgs. The attaced site MV(Figcrre 1) <br /> I <br /> shows the apprcaxima# Io ticah of the proposed borings, h ►wever,field conditions:and find.ingrs in <br /> the course of the invesdgation may necessitate modifying these locations during field work, <br /> During the problrhg, Satmpl+es.will be collected at S foot intervals or at ft-1 6r lithologic cont.. ' <br /> Sarrrpleswill be field Wined using:`'Photo loization Detector(PICS).Samples with tf a hillil t.PJP <br /> readings will be anal f+ne 1 by EF*A M +difiecl Method 8tl1 C iesel, ariid iiline,acct for. <br /> enzine,Toluene,Ethyl-Bene anti Xylene(BTEX)by EPA method 8020, eleven soil samples will <br /> b <br /> collected at the capillary fringe andanalyzed;for oxygenates by El*A Methdd 8260. <br /> Avalon will utilizla aiedorobe i sampli ig The boreholes will be cored wi#h a rig equipped, <br /> with a hydraulic-powered. on 4rive s pier. Soil samples will be obtained vwri A probing <br /> tool lined with three(8) 14rwch diameter by 6-inch long brass tum. The probing tool will be pushed <br /> or hammered hydraulically-into the soil. The bottom brass tube will be retained for laboratory <br /> analysis. The open ends of the retained sample tubi;will be covered with Teflon material, capped <br /> With plastic end caps, labeled, double-bagged in sealable plastic bas, entered lytta a chain-of- <br /> custody form and plaided on ice in a portable cooler for delivery to;a California DHS-oettified <br /> laboratory for analysis. <br /> A portion of each recovered soil sample will be placed in a sealable plastic bag, disaggregated to <br /> release any volatile petroleum hydrocarbons allowed to set for a few minutes, and then field <br /> screened using a Photo Ionization Detector(PID). Samples with high PID readings Will be anallyzed <br /> for petroleum hydrocarbons. in the absence of significant FIE?measurements,selected representative <br /> samples will be analyzed. Soil samples will be examined, described and logged under the <br /> supratv"eson of a Califcrrr'hia Registered Geologist using the[.lnified Soillas5ificatcxw (l1S) <br /> All coring and sampling equipment will be cleaned prior to use to proverit:crnss contamination <br /> between borings. Thi*sampling equipment and brass sample tubes will be cloned=using aw solution <br /> of <br /> Atconok and tap water, rinsed in tap water and final rinsed with delonized water to prevent cross <br /> cin# Mination between samples. Alconox is a non-phosphate detergent. <br /> After completiamof`the drilling and samol n& the boreholes will be backfilled with neat-cement to <br /> surface grade. <br /> Groundwater samples will be coll�cted from each baring, Two groun4waftr sairrpfft will be <br /> colleitted.*or�r a of the`four wells"drilled to a depth of 20 feed bgs. One sample will.be collected <br /> DEiidPt$tOtf1�FS fi wv w ra.: T. Project#%27-001.1 <br /> ) .ltly y9 8 2 Lathrop,CaliEty+nh* <br />