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IT Corporation <br /> 4005 Poe t ('1e1t e_fI ffi-O] n <br /> Com Orel C 191120 1120 <br /> K 1 925 288 0898 <br /> 1,ghe, EI% 9 5 '88 0888 <br /> ■ 1 11r aekL,1 ,rf 711, 1 f f r,rrp <br /> rg�°oup <br /> 1 <br /> May 15, 2000 <br /> 1 Mr Bob DeNlnno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road <br /> Portland, Oregon 97233 <br /> 1 Subject Second Quarter 2000 Monitoring and Sampling Report and Well Search <br /> Southland Store No 17647 <br /> 1 1048 West Yosemite Avenue <br /> Manteca, California <br /> IT Corporation Project 781721 <br /> ' Dear Mr DeNlnno <br /> This Second Quarter 2000 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> 1 activities performed by IT Corporation at the subject site (Figures 1 and 2,Attachment 1)on April 7, 2000 A <br /> 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 /> 1 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), diisopropyl ether (DIPE), ethyl-tert-butyl ether (ETBE), and tert- <br /> amylmethyl ether(TAME) <br /> 1 <br /> Groundwater Monitoring Data <br /> 1 Groundwater monitoring of the three wells MW-1, MW-2, and MW-3 was performed on April 7, 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 TI Well Monitoring System <br /> 1 A potentiometric surface map was prepared using the groundwater elevation data collected on <br /> April 7, 2000 (Figure 2) ' Based on the groundwater elevation data, groundwater flow is toward the <br /> 1 southwest at a gradient of approximately 0 0036 ftlft The groundwater monitoring results from the April 7, <br /> 2000 monitoring and sampling event are presented in Table 1 (Attachment 2) Field data sheets are <br /> included in Attachment 3 <br /> iIf <br /> I 2775692tpl <br /> I � { <br /> k II ii <br /> Ike I! Ik�l IE l r kl If I ,li ll II II kllk II h , � I � I k I kk kI kkl ` I I I� I <br />