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..,,F .:F - sFS"- - ---- � �� the fill pipe and that correrlpunding eappmiite and of the tank and obtaining n r.rlmpirt from tttr tmekflll/nt►tive Knil intnt•face or n schort dintAnce below the it)to!a4icr.. it, the 1'klrsF! or teanio. lr,Nt; than 1,00() gallontt in ctspacity, only ,rne snmph! from befrrrnth the, isrsh is required. A rib art dintnnre tins been lir"finmi by Rogion 2 flonrd ongineerr's an not grenter than twenty-four inches below the bteclsfill/nrstivo, rail iner.rfar.e and fa generally taken to be one foot below thea thrt backfill/native noif interfaces. Thin rsoll ira brought up in the brscichne brtr,knt. A shovel or trowel In ur;od to cut away surfnesa soil and backfill rmutrrlal !.!rich may Love bran included In the bucket, and thr sample In tukrin by purthing +u• driving is brsanrs sample liner into the newly exposed sail from the de signnt►rci depth tsnd location. Additionni rltt►•ifireationk by Relginn 1 llimrd engineers have indicated that when there is tin nhvious differens•t- In the relative r.ontandnation of Boll brought up from the, interfncte depth, than it in the reelatively more contnmittnted soil that Minuld bei selectr,d for hiclut4issrs in 0e1 sample. RUCTIVE EXPLORATORY SAMPLFS: This type of sampling employe the mania wimple collection and handling proceduren no are used In •+tnndard RWQCD interfere sampling, but the soil is typically obtained at sa grentor depth or from to pnnition that Im Interally offmA from the Interface location. STOCKPILE SMVVY MODIFIED BAAQMD PROTOCOL: This sampling follows a survey pattern, but uses n modified Ii,1AW11) protocol for sampling stockpiles of mater int that have been newly rema;,vd from is tank pit excavation. This protocol calls foe a discrete srmpht container to be collected for ovary 12.5 cubic yards of material. The survey includes opposite sides of tl�c stockpile. 5trlct obbervnnce of the 8AAQ?1D protocol (for purposes of evaluating the leveln of fuel .-rtprar filtely to be diucha',ge•I from a stockpile) { calls for inclusion of the surface: material in the brass linea which is driven into the bile r►t n righE angle (to the tingle of repose) until the s liner is full. t.rrlless %pmcifically asked to follow the BAAQ,%ID pr.atocole our pertonnel routinely stindify the procedure to exclude the surface soil and collect soil from n depth of eight to eighteen inches. Whiles this prejudices the sample in the direction of yielding higher results than would a atrict _ BAA%ly1D lsnmpin, it b4 more reprersent.stive of the levels of fuel hydrocarbons = present in the axil and is not likely to mislead the client or contractor mica offhaulir►g or backfilling with soil stockpiles that are relatively clean at tho surface, but unacceptably rnntaminated through the remainder of their volun;P. SAMPLE CONTAINPHS Our firm uss•s new sample containers of the type specified by slither EPA or the RWQCB for the collection of samples at sites where underground ,storage tanks ere! involved. Water samples uru contained in 40 ml volatile organic nnulysis vials JV0AsI when analysisfor gasoline tend similar light volatile a compounds iN intendNd. These containers are prepared according to EPA SW 846 and will contuin n smtall amount of preservative when the analysis_ is for TPII atm gasoline or EPA 602. Vialsi,ttrrsded for EPA 601 analysis and 1rP�-6Z4 GCA1S prsxedurea are not preserved. Closure is accomplished with an open headed F (syringe aucep Bible) plastic screw cap 4arought darn on tip of a Teflon faced Sampling Ruport 811057-C--1 Chevron 1918 SECTION TWO/ptsge 9 F