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<br /> ATC Associates Inc
<br /> 1117 Lone Palin Avenue, Suite B
<br /> (:
<br /> Modesto, California 95351 VYATC
<br /> 209-579-2221
<br /> • ASSOCIATE 8 INC Fax 209-579-2225
<br /> ANALYTICAL RESULTS
<br /> The groundwater samples collected from wells MW1, MW2, MW4, MW5, MW6, and MW9
<br /> contained detectable concentrations of TPHg and/or BTEX constituents The groundwater
<br /> samples collected from wells MW3 and MW8 and the on-site domestic well contained no
<br /> detectable concentrations of TPHg, BTEX, MTBE, TBA, DIPE, ETBE, TAME, 1,2-DCA, or
<br /> EDB
<br /> The groundwater samples collected from wells MW5 and MW6 contained detectable
<br /> concentrations of MTBE at 3 4 micrograms per liter (ug/L) and 62 ug/L, respectively The
<br /> groundwater samples from wells MW1, MW5, MW6, and MW9 contained detectable
<br /> concentrations of 1,2-DCA respectively as follows 59 ug/L, 9 6 ug/L, 160 ug/L, and 1 9 ug/L
<br /> The groundwater samples collected from wells MW1, MW2, MW3, MW4, MWS, MW9, and the
<br /> on-site domestic well contained no detectable concentrations of MTBE, TBA, DIPE, ETRE,
<br /> TAME, or EDB although the reporting limits for wells MW 1 and MW2 were elevated due to
<br /> dilution Concentrations of TPHg, and BTEX constituents detected in the groundwater sample
<br /> collected from well MW1 increased significantly since the previous groundwater monitoring event
<br /> conducted on August 17, 2004
<br /> . Analytical results of groundwater samples are summarized in Table 2 and laboratory data sheets
<br /> are contained in Attachment 2
<br /> GEOTRACKER DATA UPLOAD
<br /> The depth to water data was submitted electronically to the State Water Resources Control Board
<br /> (SWRCB) Geotracker database (confirmation number 4562225162) and the laboratory data was
<br /> also submitted electronically to the SWRCB Geotracker database (confirmation number
<br /> 2916210353) The facility has been assigned a Geotracker global identification number
<br /> T0607700051 Documentation of the data submittal is contained in Attachment 3
<br /> RECOMMENDATIONS
<br /> Based on the results of the fourth quarter 2004 monitoring event, we recommend the following
<br /> • Continue quarterly monitoring and analyze samples from the monitoring wells for TPHg,
<br /> BTEX, MTBE, ETBE, DIPE, TBA, TAME, 1,2-DCA, and EDB
<br /> • Continue with scheduling the installation of the remediation system proposed in ATC's
<br /> Interim Remediation Plan(IRP) dated March 25, 2004 and approved in a letter from SJCEHD
<br /> dated April 23, 2004
<br /> s renvwmnenW\2529lVeporrs14QR-2004 doc 3
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