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<br /> S E C ® R
<br /> . Mr Harlin Knoll
<br /> March 27, 2006
<br /> Page 2
<br /> REPORT OF FINDINGS
<br /> On January 26, 2006, Gettler-Ryan Incorporated (G-R) performed 1Q2006 groundwater
<br /> monitoring and sampling event at the above referenced site (Attachment A) Monitoring
<br /> well samples collected by G-R were analyzed by a suite of analytical methods chosen to
<br /> assess the presence of total petroleum hydrocarbons as gasoline (TPHg), benzene,
<br /> toluene, ethylbenzene, and total xylenes (BTEX), methyl tertiary butyl ether (MtBE), di-
<br /> isopropyl ether, (DIPE), ethyl tert-butyl ether (EtBE), tert-butyl alcohol, (TBA), tert-amyl
<br /> methyl ether (TAME), 1,2-dcchloroethane, (1,2-DCA), ethylene bromide (EDB), and
<br /> ethanol Whenever possible, detection limits for all analyses, with the exception of TPHg,
<br /> ethanol, and TBA, have been 0 5 micrograms per liter (Ng/L) Sporadically the detection
<br /> limits were raised due to the presence of elevated concentrations of TPHg Typically
<br /> detection limits for TPHg, ethanol, and TBA are 50,ug/L, 50 Ng/L, and 5,ug/L, respectively
<br /> G-R's standard operating procedures (SOPs) Indicate that before sampling, each well is
<br /> checked for the presence of separate-phase petroleum hydrocarbons If separate-phase
<br /> petroleum hydrocarbons are not detected, then the depth to water and the total depth of
<br /> each well Is measured and recorded prior to sampling Groundwater elevations are
<br /> • calculated using the measured depths Groundwater elevations across the site ranged
<br /> from -24 42 to -23 53 feet below mean sea level (msl) Groundwater elevation across the
<br /> site Increased an average of 5 86 feet from the previous sampling event Groundwater flow
<br /> was calculated to the southeast at an approximate gradient of 0 001 to 0 004 A summary
<br /> of TPHg, benzene, MtBE, EDB, 1,2-DCA, and TBA laboratory analytical data are presented
<br /> below
<br /> ANALYTICAL METHODS
<br /> Groundwater samples from MW-1, MW-2, MW-3, MW4, MW-4D, MW-5, MW-5D, MW-6,
<br /> MW-6D, and MW-7 were analyzed using the following parameters,
<br /> • BTEX, MtBE, DIPE, EtBE, TBA, TAME, Ethanol, 1,2-DCA, and EDB by EPA Method
<br /> 82606,
<br /> • TPHg as TPH-GRO by CA LUFT modified EPA Method 80158
<br /> RESULTS
<br /> Laboratory analytical results are summarized In Tables 1 through 2 These tables
<br /> represent a summary of data tables presented In the G-R report Included as Attachment A
<br /> No petroleum hydrocarbon constituents were detailed In the certified laboratory analytical
<br /> • reports for groundwater samples collected from monitoring wells MW-1, MW-4, and MW-D
<br /> N 1Files\ProjectslChevron\Retaill#9-32321Periodic Monitonng1200611Q0611Q06 QMR doc
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