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M Corporation <br /> 4.005 Port C:hrcago Highudv <br /> Concord CA 94520 1120 .v <br /> 1,.1 925 288 9898 <br /> 1,jx 925 288 0888 p Q <br /> I) the ^` <br /> u <br /> ti <br /> roup. A,l embe f of Floe 17 Croup <br /> y 3� <br /> July 9,2001 <br /> s <br /> C'' y <br /> ' Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 <br /> ' Subject Second Quarter 2001 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 DeNinno <br /> This Second Quarter 2001 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by IT Corporation at the subject site (Figures 1 and 2, Attachment 1) on April <br /> 2,2001 A summary of activities conducted during this reporting period is provided below <br /> 0 Depth to water(DTW)was gauged in nine site-related groundwater monitoring wells MW-1, <br /> MW-1 A, MW-2, MW-4, MW-4A, MW-5,MW-5A,MW-6, and MW-7 <br /> ' 0 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), methyl-tent-butyl ether(MTBE),tert- <br /> butanol (TBA), dnsopropyl 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,MW-5, MW-6,and MW-7,the <br /> deeper wells are MW-1A,MW4A, 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 /> ' Groundwater 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 />