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c - - x .. VERIFICATION SAMPLING OF TANK FIELD WEGE bas contracted West HazmathDrillfaot(dPp�'#i5west9oftthedrill UST and sample one roil baring UST and drill, sample and install toground2water forlthistsitetrangesof e from see Figure 3. Depth to g 11.7' to 12.9' at monitor well MWI- Starting at the 11 foot depth of each boring, samples will be obtained to top of ground water, and field screened for total volatile organic vapors using a HNu photoionizing detector with a 10,2 electron volt bulb. The sample exhibiting the highest in a response ss fres with athe luminumlbe foilCandained plastic end 2caps, thatwill sleeve, capped labeled with sample ID#, time sampled, be sealed with duck tape, date sampled and analysis ie,beseealed, The andsplaced onlicehein a placed in a Zip-Lock bagg to MATRIX Environmental cooler and transported that day Laboratories (DHS# 1676) for analysis of Total Petroleum GC FID {5030} and BTEX using Hydrocarbons Gas (TPH G) using a e 17 of Tri-Regional Board method 8020 as shown on Table #2, p g Staff Recommendation August 10, 1990. VERIFICATION OF COPTTAMINANT FREE GROUND WATER DOWN GRADIENT OF TANK FIELD. Monitor well (MW4) will be placed northeast of the tank fielusingTEX and lead, d, developed and hee imempheedsarnpled for PisGobtained, monitor wellsMW1, methods. At t MW2, and MW3 will also If laboratory analysis indicateled. All wells will be sathat the depth to ground wat a request to destroy } ground water sampled is contaminant free, all four monitor wells will be presented. WELL CONSTRUCTION the The well will be ded by GeoYEngineersWest mCt57C5drilling�) contractors supervision of Western 513857 and California Registered Geologist license nted auger rig, onch7 hollow Hazmat utilizing a truck mou stem augers, will drill to the eleven foot depth, then sample from the l samples eleven foo1edepth into top of gheuHNund wPlDrandAldescribed recovered will be field screened samples that indicate uaing'ASTM guidelines. Any reserved (stored in a zip contamination will be sealed, labeled, p nd chain of custody ice delivered to mt lock. on ice in an ichest) a the will MATRIX Laboratories lbasesofpthe boring obThese dwill also he of ground water and the preserved aand BTEXin �oncesthe boringehas beered to nAcompleted, araalytwo for TPH G sing with 0.02 inch slot will be installed inch SCH 40 F480 PVC ca from approximately the 15 foot depth to the 10 foot depth. The 10 foot deptaintssaeamachine threaded andce will be cased hsealedcwithlOnrings — - . --Teasing= -All 3 - page2 l..