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mental & Infrastructure, Inc <br /> NOV Q 4 2a�Z 4005 Port Chicago Highway <br /> Concord CA 94520-1120 <br /> ' ENVIRORMENT HEALTH 925 2889898 <br /> f 1ERMITISERVICES Fax 925 288 0888 ShaW The Shaw Group Inc'Inc TM <br /> 1 <br /> October 31, 2002 � N h <br /> 1 Aff ceapvll <br /> l <br /> Mr Bob DeNinno <br /> 1 7-Eleven, Inc �;� <br /> 4 <br /> 10220 S W Greenburg Road, Suite 470 � 1�J�a�! a' <br /> 1 Portland, OR 97233 6� ti 1 1 <br /> Subject Third Quarter 2002 Monitoring, Sampling, and Remediation Progress Report <br /> 1 7-Eleven Store No 19976 <br /> 1399 North Main Street <br /> Manteca, California <br /> Shaw Project No 779956 <br /> 1 Dear Mr DeNinno <br /> This Third Quarter 2002 Monitoring, Sampling, and Remediation Progress Report includes the results of <br /> monitoring and sampling activities performed by Shaw Environmental, Inc (Shaw) at the subject site <br /> (Figures 1 and 2, Attachment 1) on July 8, 2002, and remediation events conducted during the third <br /> 1 quarter 2002 A summary of activities conducted during this reporting period is provided below <br /> ' • Depth to water(DTW)was gauged in ten site-related groundwater monitoring wells (MW-1, <br /> MW-1A, MW-2, MW-3, MW-4, MW-4A, MW-5, MW-5A, MW-6, and MW-7) <br /> • Groundwater samples were collected from the monitoring wells and submitted to a California- <br /> certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes (BTEX), <br /> total petroleum hydrocarbons-as-gasoline (TPH-G), methyl-tert-butyl-ether(MTBE), tert- <br /> butanol (TBA), diisopropyl ether(DIPE), ethyl-tert-butyl ether(ETBE), and tert-amylmethyl <br /> ' ether(TAME) <br /> • Soil vapor extraction (SVE)was conducted on August 1 and 22, 2002, using the horizontal <br /> vent wells SVE was conducted using a 250-cubic-foot per minute(cfm) thermal oxidizer <br /> ' operated under a Permit to Construct issued by the local air pollution control district A Permit <br /> to Operate is being obtained and, once received, will allow for increased SVE frequency <br /> ' Background <br /> The site is an active 7-Eleven facility that dispenses gasoline The San Joaquin County Public Health <br /> Services (SJCPHS) has indicated that remediation will be required based on site levels of dissolved <br /> MTBE Specific site cleanup goals have not yet been established by the SJCPHS <br /> I_ <br /> 11176Q23 ooc <br /> 1 <br />