Laserfiche WebLink
CSUS-Multi Campus Regional Center--Quarterly Groundwater Monitoring <br /> July 25,2002 <br /> Page 2 <br /> FIELD OBSERVATIONS <br /> No separate phase petroleum or sheen was noted„in the groundwater recovered from the wells. A mild <br /> petroleum odor was noted in the groundwater recovered from MW-3. Groundwater monitoring field <br /> forms are attached. <br /> GROUNDWATER ELEVATIONS AND GRADIENT <br /> On June 28, 2002 the depth to groundwater was measured in monitor wells MW-1, MW-2, and MW-3. <br /> Groundwater elevation data is presented in Table 1. The average depth to groundwater in the monitor <br /> wells was approximately 37.19 feet below the surveyed well collar measuring points (the measuring <br /> points are slightly below the ground surface). The average groundwater elevation measured in the <br /> monitoring wells increased approximately 0.3 feet between December 18, 2001 and June 28, 2002. The <br /> estimated groundwater gradient for the site on June 28, 2002 was 0.0015 ft/ft to the southeast and is <br /> shown in attached Figure 2. <br /> Table i Groundwater Elevation Data(June 28,2002) <br /> Well Number Well Collar Elevation (fcet)l Depth to Groundwater(feet) lGroundwater Elevation(feet) <br /> MW-1 17.42 37.16 -19.74 <br /> MW-2 17.59 37.38 -19.79 <br /> MW-3 17.16 37.02 -19.86 <br /> All measurements are in feet. <br /> TOC=Top of Casing <br /> TOC Elevation: Referenced to NAVD98 datum from NGS Benchmark HS3999. <br /> LABORATORY ANALYTICAL RESULTS <br /> All groundwater samples were analyzed for total petroleum hydrocarbons (TPH) quantified as kerosene, <br /> diesel, and motor oil by EPA Method 8015B; for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-G) and for benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method <br /> 8015/8020F; and for gasoline oxygenates/additives by EPA Method 8260. The gasoline i <br /> oxygenates/additives include Methyl tertiary-Butyl Ether(MTBE), ethanol,tertiary-Butanol (T-BUT),Di- <br /> isopropyl ether (DIPE), Ethyl tertiary-Butyl Ether (ETBE), tertiary-amyl Methyl Ether (TAME), 1,2- <br /> Dibromoethane, and 1,2-dichloroethane (1,2-DCA). Excelchem Environmental Labs of Roseville, CA <br /> analyzed the groundwater samples. The laboratory analytical results for the groundwater samples <br /> collected from the monitor wells on June 28, 2002 are presented in Table 2, on the next page, and in <br /> Figure 3, attached. The laboratory certificates of analyses and chain-of-custody record are attached. <br /> F. <br /> L� CONDOR <br />