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IT Corporation <br /> a <br /> 737 irnold Drive, Sinte D <br /> Alai tmm,, CA 9455.3 6526 <br /> 0 <br /> h] 925 370 3990 <br />;&he 'k 1 925 370 3991 <br /> V _ ti, , til ' � <br /> ®group <br /> 1 S ltunLe r ul 1 he 11 !,roup <br /> su <br /> 1 July 6, 1999 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 1 10220 S W Greenburg Road, Suite 470 <br /> Portland, Oregon 97233 <br /> Subject Second Quarter 1999 Monitoring and Sampling Report <br /> 7-Eleven Site No 17334 <br /> 4501 North Pershing Avenue <br /> Stockton, California <br /> 1 IT Corporation Project 779950 <br /> Dear Mr DeNinno <br /> 1 This Second 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 May 21, 1999 A summary of activities conducted during this reporting period is provided below <br /> ■ Depth to water(DTW)was gauged in five site-related groundwater monitoring wells <br /> (MW-2 through MW-4 and wells MW-5A and MW5-6) <br /> ■ Groundwater samples were collected from five monitoring wells (MW-2, MW-3, MW-4, <br /> MW-5A and MW-5B) and submitted to a California-certified laboratory for analysis of <br /> 1 benzene,toluene, ethylbenzene and total xylenes (BTEX), methyl-tert-butyl-ether <br /> (MTBE),tert-butanol (TBA), dusopropyl ether (DIPS), ethyl-tert-butyl ether(ETBE),tert- <br /> amylmethyl ether(TAME), and total petroleum hydrocarbons-as-gasoline (TPH-G) <br /> 1 Groundwater Monitoring Data <br /> Groundwater monitoring of the wells was performed on May 21, 1999 Before monitoring,the well <br /> caps were opened to allow the water in each well to stabilize to atmospheric pressure The DTW <br />' was measured to the nearest 0 01 foot from the top of the well casing using an interface probe <br /> A potentiometric surface map was prepared using the groundwater elevation data collected from <br /> the five monitoring wells on May 21, 1999 (Figure 2) Based on the potentrometnc surface map, <br /> groundwater flow is toward the northeast at an approximate gradient of 0 004 foot per foot <br /> Groundwater monitoring results for May 21, 1999 and historical monitoring results are presented in <br /> Tables 1 and 2 (Attachment 2) Field data sheets are included in Attachment 3 <br />