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72 10 November 1.999 AGE-NC Project No. 98-0433 Page.5 of,13 i , 1 ' Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) by EPA Method 8015 Modified and ' • Volatile aromatic conipotulds: benzene, toluene, ethylbenzene and total xylenes (BTEX) and mcthyl-tort-butyl ether (MTBE) by EPA Method 8'OM • Oxygenated fuel additives: TVITBE, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPS), ethyl tertiary butyl ether(l TBE).and tertiary amyl methyl ether(TAME) in accordance with LPA methods 8260 Modified. The results of the soil sample laboratory analysis are presented in Section 4.2. During drilling, auger returns were monitored for the presence of Organic vapor* using an orbame vapor analyzer (OVA.) egt)ipped with a photo-ionization detector .(PID' Thermo l zlvironmental 580A, 10.0 eV, calibrated to isobtayleric). AfUei: returns «icre placed on plastic and stored on-site pending laboratory analysis and disposal at a licenced facility. 3.5.2. t,OGGING Duplicate soil samples were extruded from the excess brass sleeve or soil sample location in the core° barrel sample and were screened for the presence of organic vapor, rising the OVA. The OVA readings Nvere recorded on.the boring logs. Soils were visually described and logged in accordance with the Unified Soil Classification System (USCS). A description of the soils crimentered in the site invCstigation soil bbrings is presented in Section 4.1 . Boring logs are presented in Appendix A. 3.5.3. MONITORING WELL INS'i-ALLATION AND DEVI LOPML:NIT A total oft I ve ground water monitoring vxlls were ii)stalled at the site (Figure 2). t'ollowing drilling ' and sampling of soil borings MW-1 throttgh MW-5, the soil borings were completed as ground water monitorang wells. IJach ground monitoring well was completed with 20 feet of well screen section. The wells were constructed using two 2-inch diameter, schedule 40 PVC casing and have the ' foltowin- designs all(.] material: jMonitoring wells were constructed with 0.02-inch slotted screen installed fro;n depths of*10 to 30 ' feet bs mcl with blank casino;cxtending to the surface. A filter hack was installed using 43 Lonestar saner from 9 to 30 feet bsg:Bentonite chips \`T?erc used to nlal<c a 0=400t transition seal above the sts �d pac]<:'l�hc rcmaiuin�� annular shave teas bacl:.lilled io within six inches of surface grade with portland CQilleflt. A trap lc-ratcd veli box (8-inch diameter) was Installed over e,,fch well, in r accordance With COLIMV re,1,11ations. Monitoring well design specifications are depicted in Appendix . .frh•u�tcc°rl(.>cof?n�•ir'anrmcntal, fnr.