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w <br /> S EtC0R <br /> DATE September 11 2003 <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> Store Number 7-Eleven Store#19976 <br /> Site Address 1399 North Main Street, Manteca, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc —Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 19976 03 0518 <br /> Primary Agency San Joaquin County Environmental Health Department (SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Second —20031 <br /> 1 Conduct groundwater monitoring and sampling of ten wells on June 27, 2003 <br /> 2 Perform periodic oxygen injection in wells SP-1 and SP-1A on April 10, April 21, May 2, and May 12, <br /> 2003 <br /> 3 Prepare quarterly groundwater sampling and remediation progress report <br /> z <br /> 4 Underground storage tank removal and replacement <br /> WORK PROPOSED FOR NEXT QUARTER [Third—20031 <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> 2 Continue periodic oxygen injection into wells SP-1 and SP-1A <br /> 3 Resume periodic soil vapor extraction once Permit to Operate is obtained from the San Joaquin <br /> Valley Air Pollution Control District <br /> DISCUSSION <br /> An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 and 2) <br /> Monitoring and sampling has been conducted at the site since the third quarter of 1998 The current <br /> groundwater monitoring and sampling data are summarized in Table 1 and presented in Figures 2 ander <br /> 3 Historical groundwater monitoring and sampling results are summarized in Table 2 The well <br /> completion details are summarized in Table 3 r.M <br /> Y w <br /> Current Site Information <br /> t� <br /> Current Phase of Project Groundwater Monitoring and Periodic j <br /> Remediation <br /> a <br /> Frequency of Monitoring and Sampling Quarterly, Ten wells- MW-1 through MW- <br /> 7, MW-1A, MW-4A, MW-5A <br /> � a <br /> Are Liquid Phase Hydrocarbons Present On-site No r� <br /> Water Supply Wells within a 2,000 foot radius and their 65 wells within 2,000 feet in various <br /> Respective Direction directions <br /> Current Remediation Techniques Oxygen injection and soil vapor extraction & , <br /> Permits for Discharge San Joaquin Valley Air Pollution Control <br /> District Authority to Construct No N-4761- <br /> 1-0 <br /> Historic Range in Depth to Water, Q3-98 to Q2-03 MW-1, 14 17 to 21 12 feet bgs <br /> Current Quarter_Monitoring Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Ten wells- MW-1 through MW-7, MW-1A, <br /> MW-4A, MW-5A <br /> . Dissolved Oxygen Readings Collected From Ten wells- MW-1 through MW-7, MW-1A, <br /> MW-4A, MW-5A <br /> Approximate Depth to Groundwater(DTW) 19 78 to 22 16 ft bgs <br /> 19976 03-2Q Report doc <br />