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' IT Corporation <br /> 4005 Port Chtc,t�o Highs, is <br /> Concord C4 94 520 1120 <br /> 7e1 915 188 9898 <br /> the Fa. 915188 0888 <br /> rg�rou� <br /> L ilenzbcr of Thi IT Group <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 17647 <br /> 1048 West Yosemite Avenue <br /> Manteca, California <br /> IT Corporation Project 781721 <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 /> f� Depth to water(DTW)was gauged in three site-related groundwater monitoring wells <br /> 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-tent-butyl- <br /> ether (MTBE), tert-butanol (TBA), diisopropyl ether(DIPE), ethyl-tert-butyl ether(ETBE), and tert- <br /> ' amylmethyl ether (TAME) <br /> Groundwater Monitoring Data <br /> ' Groundwater monitoringf - _ <br /> o 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 /> 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 /> A potentiometnc surface map was prepared using the groundwater,elevation data collected on <br /> July 20, 2000 (Figure 2) Based on the groundwater elevation data, groundwater flow is toward the <br /> ' southwest at a gradient of approximately 0 007 ft/ft The groundwater monitoring results from the July 20, <br /> 2000 monitoring and sampling event and historical data are presented in Table 1 (Attachment 2) Field data <br /> sheets are included in Attachment 3 <br /> 2175682 rpt <br />