Laserfiche WebLink
23 May 2001 <br /> AGE-NC Project No. 99-0592 <br /> Page 3 of 8 <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 <br /> Modified/5030; <br /> • Total petroleum hydrocarbons quantified as diesel (TPH-d) by EPA Method 8015 <br /> Modified/3550, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tert-butyl ether <br /> (MTBE) by EPA Method 8020; and <br /> • Fuel oxygenating compounds including MTBE, di-isopropyl ether (DIPE), ethyl tertiary- <br /> butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tert-Butanol (TBA), Methanol, <br /> Ethanol, ethyl dibromide(EDB) and 1,2-Dichloroethane(1,2-DCA) by EPA Method 8260. <br /> Laboratory reports for soil analyses, testing methods, laboratory quality assurance/quality control <br /> (QA/QC) reports, and sample chain of custody documentation will be presented in a report with <br /> findings and recommendations. <br /> 3.2. MONITORING WELL INSTALLATION AND SAMPLING <br /> Monitoring wells will provide repeatable sampling points for hydrocarbon-impacted ground water <br /> and allow determination of site-specific ground water flow direction. The procedures for soil <br /> sampling, monitoring well installation and ground water sampling are presented in Section 4.1., <br /> Section 4.2. and Section 4.4., respectively. <br /> 3.2.1. Monitoring Well Installation and Development <br /> Following completion of the pilot borings, two-inch diameter monitoring wells will be installed in <br /> the three borings. Wells will consist of 20 feet of well screen section. The well screen section will <br /> be installed across the observed water table level with approximately five feet of screen section <br /> extending above the water level and fifteen feet of screen section extending below the water table <br /> level. Based on available information, it is anticipated that the total depth of the monitoring wells <br /> will be approximately 70 feet bsg. Wells will be completed as described in Section 4.2. A typical <br /> monitoring well design is presented in Figure 3. <br /> Following well installation, the wells will be developed to maximize water flow into the well and <br /> minimize the amount of fine-grained sediment drawn into the well during purging for monitoring <br /> events. Field procedures for monitoring well installation and development are presented in Sections <br /> 4.2 and 4.3, respectively. <br /> Advanced GeoEnvironmental,Inc. <br />