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' IT Corporation <br /> 4005 Part Chicago 111ghtt n <br /> Concord C4 94 i2O 1120 <br /> Til 927 288 9898 <br /> Eax 925 288 0888 <br /> he A1IPmLrr of Thi I f Lrntrf� <br /> (#P1*0UP. <br /> 1 <br /> 1 <br /> ' August 15, 2000 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> ' 10220 S W Greenburg Road <br /> Portland, Oregon 97233 <br /> ' Subject Third Quarter 2000 Monitoring and Sampling Report <br /> 7-Eleven Store No 21756 <br /> 853 E Yosemite Avenue <br /> Manteca, California 781723 <br /> ' Dear Mr DeNinno <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 20,2000 <br /> A summary of activities conducted during this reporting period is provided below <br /> • Depth to water(DTW)was gauged in three site-related groundwater monitoring wells <br /> ' 0 Groundwater samples were collected from the three 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), the oxygenates methyl-tert-butyl <br /> ether(MTBE), tert-butanol (TBA), dfisopropyl ether (DIPS), ethyl-tert-butyl ether (ETBE), and <br /> ' tert-amylmethyl ether(TAME) <br /> Groundwater Monitoring Data <br /> Groundwater monitoring of the three wells MW-1, MW-2, and MW-3 was performed on July 20, 2000 <br /> Before monitoring, the well caps were opened to allow the water in each well to stabilize to atmospheric <br /> 1 pressure The DTW was measured to the nearest 0 01 foot from the top of the well casing using an ORS <br /> Environmental Equipment INTERFACE PROBE TM Well Monitoring System <br /> 1 A potentiometnc surface map was prepared using the groundwater elevation data collected on July 20, <br /> 2000 (Figure 2) Based on the groundwater elevation data, groundwater flow is toward the northwest at a <br /> 1 gradient of 0 002 ft/ft The groundwater monitoring results from the July 20, 2000 monitoring and <br /> sampling event are presented in Table 1 (Attachment 2) Field data sheets are included in Attachment 3 <br /> r <br />