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' IT Corporation <br /> 4001 Port Chuago Ih9j]wdy <br /> Concord, CA 94 520 1 120 <br /> Id 925 288 9898 <br /> *he(� r�v 925 288 ossa <br /> tf*ou . <br /> A elle nehtt (AThr IT Lroup <br /> 1� <br /> DEED <br /> ' JUL 18 2001 <br /> July 9, 2001 <br /> ENVIKUNMENT HEATH <br /> Mr Bob DeNinno PEWNT/SERVICES <br /> ' 7-Eleven, Inc <br /> 10220 S W Greenburg Road ' <br /> Portland, Oregon 97233 <br /> Subject Second Quarter 2001 Monitoring and Sampling Report <br /> 7-Eleven Store No 21756 <br /> 853 E Yosemite Avenue <br /> Manteca, California 781723 <br /> Dear Mr DeNinno <br /> I' This Second Quarter 2001 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by IT Corporation at the subject site (Figures 1 and 2,Attachment 1) on April <br /> i� 4, 2001 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 /> 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),desopropyl ether(DIPE),ethyl-tert-butyl ether(ETBE), and <br /> tert-amylmethyl ether(TAME) <br /> ' Groundwater Monitoring Data <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 <br /> interface probe <br /> ' A potentiometric surface map was prepared using the quarterly groundwater elevation data (Figure 2) <br /> Results indicate that the groundwater flow is toward the west-northwest at a gradient of 0 002 fVft The <br /> ' groundwater monitoring results from the current monitoring and sampling event are presented in Table 1 <br /> (Attachment 2) Field data sheets are included in Attachment 3 <br /> ,1 <br />