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' IT Corporation <br /> 4005 fort Chicago 11tghl+,A <br /> Concord C S 94 5117 1120 <br /> Tel 915 188 9898 <br /> Fax 915 288 0888 <br /> the(tigroup. <br /> A lit tuber of Thi If Croup <br /> August 24, 2000 <br /> Mr Bob DeNinno <br /> ' 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 <br /> ' Subject Third Quarter 2000 Monitoring and Sampling Report <br /> 7-Eleven Store No 19976 <br /> 1399 North Main Street <br /> Manteca, California <br /> IT Project No 779956 <br /> ' Dear Mr DeNmno <br /> This Third Quarter 2000 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 July 21, 2000 <br /> ' A summary of activities conducted during this reporting period is provided below <br /> • Depth to water (DTW)was gauged in seven site-related groundwater monitoring wells MW-1, <br /> MW-1A, MW-2, MW-4, MW-4A, MW-5 and MW-5A <br /> • Groundwater samples were collected from the seven 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), methyl-tert-butyl-ether (MTBE), <br /> tert-butanol (TBA), dusopropyl ether(DIPE), ethyl-tert-butyl ether (ETRE), and tert-amylmethyl <br /> ' ether (TAME) <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, and MW-5, the deeper wells <br /> ' are MW-1A, MW-4A, and MW-5A Groundwater elevations are similar in wells screened within both depth <br /> intervals, seasonally fluctuating between about 14 to 17 feet below grade(about 17 - 14 feet above mean <br /> ' sea level) Well MW-3 was covered by asphalt during recent repairing of the site A metal detector will be <br /> used during next site visit to locate and uncover the well <br /> s1Groundwater Monitoring Data <br /> ' Before monitoring, each well cap was opened to allow the water level in each well to stabilize to <br /> atmospheric pressure The DTW was measured to the nearest 0 01 foot from the top of the well casing <br /> ' using an interface probe <br /> 1 <br />