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q <br /> � s <br /> 27 September 1999 <br /> AGE-NC Project No 95-0167 <br /> Page 4 of 9 <br /> the sampler in 6-inch increments was recorded on the boring logs All sampling equipment was <br /> washed in an Alconox solution and rinsed twice with water prior to each sampling run <br /> Both ends of the soil sleeve of each sample collected for laboratory analysis were covered with <br /> Teflon sheets, capped and sealed with tape The selected samples were stored in a chilled container <br /> and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a California <br /> Department of Health Services(DHS)-certified analytical laboratory located in Pacheco, California <br /> Selected samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 <br /> Modified and <br /> • Volatile aromatic compounds benzene,toluene,ethylbenzene and total xylenes(BTEX) and <br /> methyl-tert-butyl ether(MTBE) by EPA Method 8020 <br /> The results of the soil sample laboratory analysis are presented in Section 4 2 <br /> During drilling, auger returns were monitored for the presence of organic vapor using an organic <br /> vapor analyzer (OVA) equipped with a photo-ionization detector (PID Thermo Environmental <br /> 580A, 10 0 eV, calibrated to isobutylene) Auger returns were placed on plastic and stored on-site <br /> pending laboratory analysis and disposal at a licenced facility <br /> 42 LOGGING <br /> Duplicate soil samples were extruded from the second brass sleeve and were screened for the <br /> presence of organic vapor, using the OVA The OVA readings were recorded on the boring logs <br /> Soils were visually described and logged in accordance with the Unified Soil Classification System <br /> (USCS) A descnption of the soils encountered in the site investigation soil borings is presented in <br /> the finding (Section 4 1 ) Boring logs are presented in Appendix A <br /> 43 MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> A total of four ground water monitoring wells were installed at the site(Figure 2) Following drilling <br /> and Sampling ofsoil borings MW-1 through MW-4,the soil borings were completed as ground water <br /> monitoring wells Each ground monitoring well was completed with 20 feet of well screen section <br /> The wells were constructed using two 2-inch diameter, schedule 40 PVC casing with the following <br /> • designs and material <br /> Adrunced CeoEnuronmentsI,Inc <br />