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r , <br />' Langston Is Market, 15615, eiath Street Lathtu California 2 1995 <br /> p, �ecenabzr 1 , <br /> PhalelI Lateral& Vertical Extent of Second Page• 5 <br />' GrounthpaterAquifer Work Phan <br /> date and time of sampling, the nu:nbet of well volumes removed before sampling, preservatives <br /> added (if any), and any filtration perfonried on samples <br /> The samples will be refrigerated immediately for delivery to the laboratory and will under no <br /> circumstances he opened by anyone other than laboratory personnel Chain of Custody records <br /> will be maintained at all times (Figured) <br /> 34 Soal&unphng <br /> All soil sampling equipment will be thoroughly steam-cleaned before and between sampling to <br /> prevent cross contaminat.on Relatively undisturbed soil samples will be talceii at intervals of <br /> not more than 5 feet in ,order to evaluate the subsurface materials, hov;et er, this sampling <br /> interval may be waived in saturated sands in vvh�eh sample recovery is not noss.ble <br /> The soil sa-n-les will be taken usin a California Modified �, slit Spoon aavl-ler with brass <br /> p � g r ►� p <br /> liners The sarriplr r will be driven continuously by a wire hr hani.mur <br /> Thi x t z <br /> e l�tboratoiy samples �,�il� not have heap space and r nil be inunerli�i.�ly sale d in their liners <br /> using aluirimuni foil or Teflon lined plastic caps The remairung sample will be removed from <br /> its liner to be used as an aide to the on-site geologtst in logging the material at that depth <br /> Soil samples collected for analysis will be analyzed using FPA method 5030 LUFT for <br /> total petroleum hviirocarbon, in the gasoline range and EPA method 8020 for BTX&E <br /> compounds Tile rainimuni detection 1,mits used for each analyte will be 0 005 mg/kg for <br /> BTX&E and I 0 mgiKg for gasoline Analyses wLll be conducted by California <br /> Laboratory Sei vices, a State.-certified laboral ory in Rancho Cordova, California <br /> 35 Grounr ii ater Sampling <br /> A travel blank prodded by the laboratory will accompany the sample vials frorn the time they <br /> are picked up h om the lab to the time they are delivered to the lab 'I his travel blank should be <br /> listed on the Chain of Custody but will be analyzed only if all samples contain the same <br /> contaminants <br /> All sampling equipment including p g ment cI p g the pump, bailer, and cables, used by sampling personnel, will <br /> be disassembled, if appropriate, and steam-;,leaned prior to commencemtrrit of sampling These <br /> procedures will al;,o be followed between eat,h well, sampling point and at the end of the <br /> sampling day De-ionized or organic fi ee water (also provided by the labor atory) will then be <br /> I introduced into the pump of bailee as a i nirI stake of cleaning This watei will then be pumped <br /> or gently poured into sample vials to bt- used a!, purnp or baiir--r blanks Ti.esu, blanks will be <br /> tested only if their (,orre,,ponct:ng samrslen,a,e 1nuad to (orircun coWarninants <br /> Immediately p.tor In ;,.vnf ling, .water le"els sing WO,l rirpth irieaaiu0itcntra will be taken in all <br /> wells at the ,itc Eacn will be e-actiate�I u,ma sta iil��5., st{ 41 b1.iJdei plltllp, winch does <br />