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' IT Corporation <br /> 4005 Port Chicago Highway <br /> Concord CA 945201120 <br /> Tel 925 288 9898 <br /> %,he Fax 925 288 0888 <br /> (figroup. <br /> A McmLc r of 7hc 77 Group <br /> ' January 31 2002 <br /> , <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> ' 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 'f <br /> Subject Fourth Quarter 2001 Monitoring and Sampling Report tr+y <br /> ' Remediation Well Installation/interim Remediation Report <br /> 7-Eleven Store No 19976 C-D <br /> 1399 North Main Street <br /> ' Manteca, California <br /> IT Project No 779956 <br /> Dear Mr DeNinno <br /> ' This Fourth Quarter 2001 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by IT Corporation at the subject site (Figures 1 and 2,Attachment 1) on November 18, <br /> 2001 A summary of activities conducted during this reporting period is provided below <br /> Depth to water(DTW)was gauged in ten site-related groundwater monitoring wells MW-1, <br /> MW-1A, MW-2, MW-3, MW-4, MW-4A, MW-5, MW-5A, MW-6, and MW-7 <br /> Groundwater samples were collected from the monitoring wells and submitted to a California- <br /> certified laboratory for analysis of benzene,toluene, ethylbenzene and total xylenes (BTEX), <br /> total petroleum hydrocarbons-as-gasoline (TPH-G), methyl4ert-butyl-ether(MTBE),tert- <br /> butanol (TBA), diisopropyl ether (DIPE), ethyl-tert-butyl ether(ETBE), and tert-amylmethyl <br /> ' ether(TAME) <br /> • Remediation well SP-1 was installed on October 29, 2001 Interim remediation (in the form of <br /> soil vapor extraction)was conducted on December 4 and December 19,2001 <br /> Monitoring results are for two depth intervals,shallow(about 30 feet below grade) and deep (about 50 feet <br /> below grade) Shallow wells are designated as MW-1, MW-2, MW-3, MW-4, MW-5,MW-6, and MW-7,the <br /> deeper wells are MW-1A, MW-4A, and MW-5A Groundwater elevations are similar in wells screened <br /> within both depth intervals, seasonally fluctuating between about 14 to 20 feet below grade (about 7- 13 <br /> feet above mean sea level) <br /> iI <br /> E <br />