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ATC Associates Inc
<br /> 1117 Lone Palm Avenue, Suite B
<br /> �RTC
<br /> (: j
<br /> v Modesto, California 95351
<br /> 209-579-2221
<br /> . A S S Q C I A T E S I N C FaX 209-579-2225
<br /> ANALYTICAL RESULTS
<br /> The groundwater samples collected from MW3 and MW8 and the on-site domestic well
<br /> contained no detectable concentrations of TPHg and BTEX These target analytes have not been
<br /> detected at method detection limits in MW8 since November 28, 2000 MWI, MW2, MW4,
<br /> MWS, MW6, and MW9 contained detectable concentrations of TPHg and/or BTEX constituents
<br /> MW4 contained detectable concentrations of TPHg but not other target analytes Concentrations
<br /> of TPHg, and BTEX constituents detected in the groundwater sample collected from MWI
<br /> increased since the previous groundwater monitoring event conducted on February 16, 2005
<br /> The groundwater samples collected from MW8 and the on-site domestic well contained no
<br /> detectable concentrations of MTBE, TBA, DIPE, ETBE, TAME, 1,2-DCA, or EDB The
<br /> groundwater samples collected from MW5 and MW6 contained detectable concentrations of
<br /> MTBE at 5 0 micrograms per liter (ug/L) and 110 ug/L, respectively The groundwater samples
<br /> from MWI, MW2, MW3, MWS, MW6, and MW9 contained detectable concentrations of 1,2-
<br /> DCA respectively as follows 76 ug/L, 54 ug/L, 1 0 ug/L, 13 ug/L, 230 ug/L, and 2 5 ug/L MW5
<br /> contained detectable concentrations of TBA at 12 ug/L The groundwater samples collected from
<br /> MWI, MW2, MW4, MW8, and MW9 contained no detectable concentrations of MTBE, TBA,
<br /> DIPE, ETBE, TAME, or EDB although the reporting limits for MW 1 and MW2 were elevated
<br /> • due to dilution
<br /> Analytical results of groundwater samples are summarized in Table 2 and laboratory data sheets
<br /> for groundwater and soil cuttings 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 3946304142) and the laboratory data was
<br /> also submitted electronically to the SWRCB Geotracker database (confirmation number
<br /> 8428922355) 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 second quarter 2005 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 development of the remediation system proposed in ATC's Interim Remediation
<br /> Plan (IRP) dated March 25, 2004 and approved in a letter from SJCEHD dated April 23,
<br /> 2004
<br /> . • Perform VE4 elevation well survey
<br /> SIenviromenta]125291\reponsl2ndQR-2005 doc 3
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