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' IT Corporation <br /> 4005 Port Chicago 11,ghsias <br /> Concord C4 94 520 1120 <br /> • h e r s I ;S l lel 925188 9898 <br /> 1 ' Fax 915 288 0888 <br /> he `g�roup t E- 58 4 11ewher of Tlx If Group <br /> r ' !t <br /> i <br /> September 14, 2000 <br /> 1 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 /> Former Southland Store No 20632 <br /> 4627 DaVinci Drive <br /> Stockton, California <br /> IT Corporation Project 779962 <br /> Iti Dear Mr DeNinno <br /> This Third Quarter 2000 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by IT Corporation on August 8, 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 /> i <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 <br /> xylenes (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G), and the oxygenates <br /> methyl-tert-butyl-ether (MTBE), tert-butanol (TBA), diisopropyl ether (DIPS), ethyl-tert-butyl <br /> ether (ETBE), and tert-amyl-methyl ether (TAME) <br /> Groundwater Monitoring Data <br /> Groundwater monitoring of the four wells was performed on August 8, 2000 Before monitoring, the well <br /> caps were opened to allow the water in each well to stabilize to atmospheric pressure The DTW was <br /> measured to the nearest 0 01 foot from the top of the well casing using an interface probe <br /> A potentiometnc 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 0 002 ft/ft <br /> The groundwater monitoring results for the August 8, 2000 monitoring and sampling event are presented <br /> in Table 1 (Attachment 2) and historical monitoring results are summarized in Table 2 Feld data sheets <br /> are included in Attachment 3 <br /> 1 <br />