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13 December 1999 <br /> _AGE-NC'Project No. 98-0433 . <br />' Page 5of13 <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 and diesel (TPH-g and TPH-d)by EPA <br /> Method 8015 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 /> • Oxygenated fuel additives: MTBE,tertiary butyl alcohol (TBA), di-isopropyl ether(DIPE), ' <br /> ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME) in accordance with <br /> 1 EPA methods 8260 Modified. <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 /> 35.2. LOGGING <br /> ' Duplicate soil samples were extruded from the extra brass sleeves or from the unpreserved portions <br /> of the soil in the core barrel sample and were screened for the presence of organic vapor, using the <br /> OVA, equipped with PID. The OVA readings were recorded on the boring logs. Soil samples were <br /> visually described and logged in accordance with the Unified Soil Classification System (USCS). <br /> A description. of the soils encountered in the site investigation soil borings is presented in <br /> Section 4.1. Boring logs are presented in Appendix A. <br /> 3.5.3. MONITORING WELL INSTALLATION AND DEVELOPMENT <br /> A total of five ground water monitoring wells were installed at the site (Figure 2). Following drilling <br /> and sampling of soil borings MW-1 through MW-5,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 casings and have the <br /> jfollowing designs and material: <br /> Monitoring wells were constructed with 0.02-inch slotted screen installed from depths of 10 to 30 <br /> feet bsg and with blank casing extending to the surface. A filter pack was installed using#3 Lonestar <br /> Advanced GcoEnvironmental,Inc. <br />