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IT Corporadoaa <br /> 757 Arnold Drive Suite D <br /> Alartinez, CA 94553 6526 <br /> ® T.1 925 370 3990 <br /> %he FSR 925 370 3991 <br /> ' (ripgroup. A Member oI The IT Group <br /> tOctober 4, 1999 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, Oregon 97233 <br /> Subject Third Quarter 1999 Monitoring and Sampling Report <br /> 7-Eleven Site No 17334 <br /> 4501 North Pershing Avenue <br /> Stockton, California <br /> ' 1T Corporation Project 779950 <br /> Dear Mr DeNinno <br /> This Third Quarter 1999 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) <br /> on August 28, 1999 A summary of activities conducted during this reporting period is provided <br /> below <br /> ■ Depth to water (DTW)was gauged in five site-related groundwater monitoring wells <br /> (MW-2 through MW4 and wells MW-5A and MW5-B) <br /> ' ■ Groundwater samples were collected from five monitoring wells (MW-2, MW-3, MW4, <br /> MW-5A and MW-5B) and submitted to a California-certified laboratory for analysis of <br /> benzene,toluene, ethylbenzene and total xylenes (BTEX), methyl-tert-butyl ether <br /> (MTBE),tert-butanol (TBA),dnsopropyl ether (DIPE), ethyl-tert-butyl ether(ETBE),tent- <br /> ' amylmethyl ether(TAME), and total petroleum hydrocarbons-as-gasoline (TPH-G) <br /> Groundwater Monitoring Data <br /> ' Quarter) groundwater monttonn of the wells was performed on August 28, 1999 Before <br /> Y9 J p g <br /> ' 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 <br /> an interface probe, and the resulting data was used to prepare a potenttometric surface map <br /> (Figure 2) Based on the potenbometnc surface map,groundwater flow is toward the northeast at <br /> an appro)amate gradient of 0 004 foot per foot Groundwater monitoring results for the quarter and <br /> historical monitoring results are presented in Tables 1 and 2, respectively(Attachment 2) Field <br /> ' data sheets are included in Attachment 3 <br /> k�4 <br />