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Additional Soil and Groundwater Investigation and
<br /> 3 Monitor Well Installation Report
<br /> CSUS Multi-Campus Regional Center
<br /> January 11,2002
<br /> . Page 7
<br /> ;,All well-development equipment was cleaned prior to use by washing in a solution of laboratory-grade,
<br /> -� non-phosphate detergent and de-ionized water, and double rinsing with de-ionized water. The purge'water
<br /> discharged from the wells during development was placed in 55-gallon drums, sealed, labeled, and left on
<br /> site where they will remain pending laboratory analyses. Disposal of hazardous materials, if any, will be
<br /> :the responsibility of CSUS. Groundwater,WellDevelopment Field Forms are included in Appendix C.
<br /> 4.6 WELL CASING SURVEY
<br /> Following installation of the monitor wells, the wells were surveyed to determine the location and
<br /> elevation of the well collars relative to a NGS benchmark datum(Benchmark No. H94399). The well
<br /> ;collars were surveyed with a vertical accuracy of 0.01 foot and a horizontal accuracy of 0.05 foot. The
<br /> :measuring point for water-level measurements was marked on each.well collar. Well collar elevations are
<br /> shown in Figure 2,Appendix A, on the geologic boring logs in Appendix B,and in Table 4, Section 5.3.
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<br /> :4.7 GROUNDWATER SAMPLING
<br /> On December i 18, 2001, a .Condor representative was on site to measure water levels and collect.
<br /> groundwater ample, from monitor wells MW-1, MW-2, and MW-3. All dawn-hole field equipment was
<br /> decontaminated in the field.with a solution of.laboratory-grade, non-phosphate detergent and de-ionized
<br /> water and rinsed_with de-ionized water prior to use in each well. All field instruments were calibrated to
<br /> the manufacturer's recommended standards. The water level in the monitor wells was measured:to the
<br /> nearest 0.01 foot with a battery-operated, flat-tape, water-levet meter. A new, disposable, polyethylene
<br /> bailer was lowered into each well to collect a field-inspection sample. The bailer sample was inspected
<br /> for floating product, sheen, discoloration and/or. odor. Floating product was not observed in any of the
<br /> monitor wells during the groundwater sampling. A slight petroleum hydrocarbon odor was noted in the
<br /> groundwater sample collected from monitor well MW-3. Petroleum hydrocarbon odors were not noted in
<br /> l "the groundwater samples collected from monitor wells MW-I or MW-2.
<br /> :Monitor wells MW-1, MW-2, and MW-3 were purged with disposable, polyethylene bailers. Monitor
<br /> wells MW-1 and MW-3 were purged until approximately three well casing volumes of groundwater were
<br /> removed and the electrical conductivity, pH, and temperature of the purged water stabilized. Monitor well
<br /> MW-2 was purged dry after approximately two well casing volumes had been purged from the well.
<br /> Groundwater samples were collected after the water level recovered to at least 80 percent of the pre purge
<br /> water level in monitor well MW-2. The purge water was discharged.to 55-gallon drums and left on site to
<br /> await disposal. Groundwater Monitoring Field Forms are included in Appendix C.
<br /> Groundwater samples were collected from monitor wells MW- MW-2 and MW-3 b fillip laboratory-
<br /> supplied
<br /> P � Y g r3'
<br /> supplied containers directly from disposable, single—use polyethylene bailers equipped with a-bottom-
<br /> emptying device. The filled sample containers were labeled, placed in a cooler chilled with Blue,Ice®,
<br /> and delivered under chain-of-custody,procedures to Excelchem:
<br /> 14.8 LABORATORY ANALYSES
<br /> The groundwater samples collected from the monitor wells were analyzed for TPH-G and TEPH
<br /> quantified as kerosene, diesel, and motor oil by EPA Method 8015M; for BTEX by EPA Method 8020;
<br /> and for gasoline oxygenates/additives by EPA Method 8260B. The gasoline oxygenates/additives.irclude
<br /> MTBE, ethanol, tertiary-Butano 1, DIPE, ETRE,TAME, EDB,and 1,2=DCA.
<br /> The soil samples collected from the monitor well borings were analyzed for TPH-G and TPH quantified
<br /> as kerosene, diesel, and motor oil by EPA Method 8015M; for BTEX by EPA Method 8020; and for
<br /> gasoline oxygenates/additives by EPA Method 8260B. The gasoline oxygenates/additives include.MTBE,
<br /> - ethanol,tertiary-Butanol, DIPE,ETBE, and TAME.
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<br /> i CONDOR
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