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Service Station #6100
<br /> QMR & QRPS 2Q06
<br /> August 31, 2006
<br /> • Page 4
<br /> MONITORING AND SAMPLING PROCEDURES
<br /> All monitoring and sampling activities performed for this site during the second quarter of 2006
<br /> were overseen by Stratus and reviewed and certified by a Stratus California Professional
<br /> Geologist Stratus Groundwater Sampling Data Package which Is Included as Attachment B
<br /> GROUNDWATER SAMPLE ANALYSES
<br /> Groundwater samples collected from each well were submitted to TestAmenca Analytical
<br /> Testing Corporation (TestAmerica) for analysis of GRO, benzene, toluene, ethylbenzene,
<br /> xylenes (BTEX), MtBE, tert-Amyl methyl ether (TAME), dl-Isopropyl ether (DIPE), ethyl tertiary
<br /> butyl ether (EtBE), tert-butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA), 1,2-dlbromoethane
<br /> (EDB), and ethanol by Environmental Protection Agency (EPA) Method 8260B Results of the
<br /> quarterly monitoring and sampling event are discussed below
<br /> GROUNDWATER SAMPLE RESULTS AND DISTRIBUTION
<br /> Shallow Water Bearing Zone
<br /> During the second quarter 2006 monitoring event, GRO and benzene were reported in wells
<br /> MW-4 and VW-3 The highest concentrations of GRO (940,000 pg/L) and benzene (28,000
<br /> pg/L) were reported in well MW-4 MTBE, TBA, TAME, DIPE, ETBE, EDB, 1,2-DCA, and
<br /> ethanol were not reported in any of the upper zone wells Analytical results for the second
<br /> quarter 2006 are generally consistent with previous quarters
<br /> Deep Water Bearing Zone
<br /> At the time of the second quarter 2006 monitoring event, GRO and benzene were reported in
<br /> wells MW-9, MW-10, MW-12, MW-16, MW-17, and MW-18 The highest concentrations of GRO
<br /> (110,000 lag/L) and benzene (28,000 pg/L) were reported in well MW-1 MTBE, TAME, DIPE,
<br /> ETBE, or ethanol was not reported In any of the deep zone wells Analytical results for the
<br /> second quarter 2006 are generally consistent with previous quarters
<br /> Domestic Well
<br /> MTBE, TBA, TAME, DIPE, ETBE, EDB, 1,2-DCA, or ethanol were not reported above stated
<br /> laboratory method reporting limits reporting (MRLs) In DW-1 GRO was detected with a
<br /> concentration of 75 pg/L, xylenes were detected with a concentration of 51 pg/L, and
<br /> ethylbenzene were detected with a concentration of 0 96 pg/L Following these detections, the
<br /> domestic well was resampled and the resample results were non-detect for all petroleum
<br /> hydrocarbons In addition, the domestic well will be sampled monthly to confirm the absence of
<br /> petroleum hydrocarbon compounds These analytical results for the second quarter 2006 are
<br /> consistent with historical data
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