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IT Corporation <br /> 4005 fort Chicago 1119111vay <br /> Concord, CA 94520-1120 <br /> rel 925 288 9898 <br /> SheA Eix 925 288 0888 <br /> �ri;woup A Afembrr ofThe ITGmup <br /> w <br /> IMarch 30,2001 r ` <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, Oregon 97233 <br /> Subject First Quarter 2001 Monitoring and Sampling Report <br /> 7-Eleven Site No 20632 <br /> 4627 Davina Drive <br /> Stockton, California <br /> IT Corporation Project 779962 <br /> Dear Mr DeNinno <br /> This First Quarter 2001 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 February <br /> 7,2001 A summary of activities conducted during this reporting period is provided below <br /> • Depth to water(DTW)was gauged in four site-related groundwater monitoring wells (MW-1, MW- <br /> 2, MW-3, and MW-5) <br /> • Groundwater samples were collected from the monitoring wells and submitted to a <br /> California-certified laboratory for analysis of benzene,toluene, ethylbenzene and total xylenes <br /> (BTEX), methyl-tert-butyl-ether(MTBE),tert-butanol (TBA), dnsopropyl ether(DIPS), ethyl-tert- <br /> butyl ether(ETBE),tert-amylmethyl ether (TAME), and total petroleum hydrocarbons-as-gasoline <br /> (TPH-G) <br /> Groundwater Monitoring Data <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 <br /> interface probe, and the resulting data was used to prepare a potentometnc surface map (Figure 2) <br /> Based on the potenbometnc surface map, groundwater flow is toward the southwest at an approximate <br /> gradient of about 0 002 foot per foot Groundwater monitoring results for the quarter and historical <br /> monitoring results are presented in Tables 1 and 2, respectively(Attachment 2) Field data sheets are <br /> included in Attachment 3 <br /> 6 <br />