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' f1T Corporation <br /> 4005 Port Chicago Highway <br /> Concord, CA 945201120 <br /> ® Tel 925 288 9898 <br /> Fdx 925 288 0888 <br /> ® tS,tif�rnher of The 1lt.-J) �p �{ �] � <br /> ® n tic t'�� <br /> ' April 29, 2002 MAY Q 3 20 2 <br /> ENVIRO'NW-0 HEALTH <br /> ' Mr Bob DeNinno PERMITISERVIWES <br /> 7-Eleven, Inc <br /> 3130 S Owyhee Street <br /> ' Boise, ID 83705 <br /> Subject First Quarter 2002 Monitoring and Sampling Report <br /> 7-Eleven Store No 17647 <br /> ' 1048 West Yosemite Avenue <br /> Manteca, California <br /> IT Corporation Project 781721 <br /> ' Dear Mr DeNinno <br /> ' This First Quarter 2002 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by IT Corporation at the subject site (Attachment 1, Figure 1) on January 7, 2002 <br /> C A summary of activities conducted during this reporting period is provided below <br /> Depth to water(DTW) was gauged in three site-related groundwater monitoring wells <br /> ' c Groundwater samples were collected from the three monitoring wells and submitted to a <br /> California-certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes <br /> ' (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G), the oxygenates methyl-tert-butyl- <br /> ether(MTBE), tert-butanol (TBA), dnsopropyl ether(D1PE), ethyl-tent-butyl ether(ETRE), and <br /> tertamylmethyl ether(TAME) <br /> ' o Selected soil and grab groundwater samples were collected downgradient of the existing well <br /> configuration to complete plume delineation during the March site assessment, per the <br /> Pre-Closure Sampling Workplan (IT Corporation, October 2001) <br /> Additional plume delineation (sod borings) was completed after collection of first quarter 2002 groundwater <br /> monitoring data The San Joaquin County Public Health Services Department(SJCPHS) has indicated no <br /> ' further action may be approved pending completion of additional assessment, analysis for <br /> 1,2-dichloroethane (1,2-DCA), and residual mass calculation Dissolved 1,2-DCA was not included in the <br /> first quarter 2002 sampling due to an oversight, therefore, sampling of groundwater monitoring wells for <br /> i' 1,2-DCA and a residual mass calculation will be conducted during the second quarter 2002, at which time <br /> closure will be evaluated <br /> 1 <br />