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' IT Corporation <br /> 757 4rnold Drive, Suite D <br /> Pr }� Martinez, CA 94553-6526 <br /> ® 'lel 925 370 3990 <br /> Fax 925 370 3991 <br /> the(' t;group- I A Member of The IT Group <br />' October 4, 1999 <br /> Mr Bob DeNinno <br />' 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland,OR 97233 <br /> t Subject Third Quarter 1999 Monitoring and Sampling Report <br /> Former Southland Store No 20632 <br /> 4627 DaVinci Drive <br /> Stockton, California <br />' IT Corporation Project 779962 <br /> Dear Mr DeNinno <br /> This Third Quarter 1999 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by IT Corporation,Inc , at the subject site (Figures 1 and 2,Attachment 1) on <br />' August 28, 1999 A summary of activities conducted during this reporting period Is provided below <br /> ■ Depth to water(DTW)was gauged in four sde-related groundwater monitoring wells,MWA, <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),diisopropyl ether(DIPS), ethyl-tert-butyl ether(ETBE), <br /> and tert-amyl-methyl ether (TAME) <br />' Groundwater Monitoring Data <br /> Groundwater monitoring of the four wells was performed on August 28, 1999 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 potenttometric surface map was prepared using the groundwater elevation data (Figure 2) Based on <br /> the groundwater elevation data,groundwater flow is toward the south at a gradient of 0 0007 ft/ft The <br /> groundwater monitoring results from the August 28, 1999 monitoring and sampling event and historical <br /> monitoring results are presented in Table 1 (Attachment 2) Field data sheets are included in <br />' Attachment 3 <br />