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' IT Corporation <br /> 4005 Port Chira o 111,4114 rt <br /> Concord C 1 91 20 1120 <br /> R 1 925 388 0808 <br /> Fax 92 i ?88 0888 <br /> he A '' �F if 1 01 <br /> ,�0�� 4,1IrmL:r of 712t II (roup <br /> February 2, 2000 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br />' 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 <br /> Subject First Quarter 2000 Monitoring and Sampling Report <br />' Farmer Southland Store No 20632 <br /> 4627 DaVinct Drive <br /> Stockton, California <br /> IT Corporation Protect 779962 <br /> Dear Mr DeNinno <br />' This First Quarter 2000 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by IT Corporation on February 2, 2000, at the subject site (Figures 1 and 2, <br />' Attachment 1) A summary of activities conducted during this reporting period is provided below <br /> ■ Depth to water (DTW) was gauged in four site-related groundwater monitoring wells, MW-1, <br /> MW-2, MW-3, and MW-5 <br /> ■ Groundwater samples were collected from the four 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), and the oxygenates methyl-tert- <br /> butyl-ether(MTBE), tert-butanol (TBA), ditsopropyl ether(DIPS), ethyl-tert-butyl ether (ETBl ), <br />' and tert-amyl-methyl ether(TAME) <br /> Groundwater Monitoring Data <br />' Groundwater monitoring of the four wells was performed on February 2, 2000 Before monitoring, the <br /> well caps were opened to allow the water in each well to stabilize to atmospheric pressure The DTW <br /> was measured to the nearest 0 01 foot from the top of the well casing using an interface probe <br />' A potentiometric surface map was prepared using the groundwater elevation data (Figure 2) Based on <br /> the groundwater elevation data, groundwater flow is toward the southwest at a gradient of 0 004 ft/ft The <br /> groundwater monitoring results for the February 2, 2000 monitoring and sampling event are presented in <br /> Table 1 (Attachment 2) and historical monitoring results are summarized in Table 2 Field data sheets <br /> are included rn Attachment 3 _ <br />