Laserfiche WebLink
N..o� <br /> CHRONOLOGY <br /> 7-Eleven Store #32262 <br /> 2360 Grant Line Road <br /> Tracy, CA 95367 <br /> 05/03/03 Grab water samples were collected from two tank pit observation wells by <br /> 7-Eleven, Inc.'s consultant (SECOR) during dispenser upgrade activities on this <br /> date. Petroleum hydrocarbon contamination was reported in the water samples <br /> with concentrations of up to 510,000 micrograms per liter (Ng/1) of methyl tertiary <br /> butyl ether (MtBE). <br /> 05/19/03 Unauthorized Release Report and Notification of Hazardous Waste Discharge <br /> #03-028 were submitted this date. <br /> 05/29/03 Three underground storage tanks (UST's) were removed this date under San <br /> Joaquin County Environmental Health Department (EHD) permit and inspection. <br /> During the excavation dewatering activities approximately 199,000 gallons of <br /> water, and an estimated 244 pounds of MtBE, were removed. <br /> 05/29/03 A Notice of Responsibility was sent this date to responsible party 7-Eleven, Inc. <br /> 06/02/03 Samples (T1-10' through T9-14') were collected this date from the bottom of the <br /> tank excavation; laboratory analyses reported petroleum hydrocarbon impact. <br /> 06/24/03 A Record Title Owner letter was received this date by the EHD. The owner of the <br /> property is YLY LLC; lessee of the property is 7-Eleven, Inc. <br /> 0513/04 A Notice of Responsibility was sent this date to property owner YLY LLC and <br /> tank owner/operator 7-Eleven, Inc. <br /> 10/15-17/03 Six groundwater monitoring wells (MW-1 through MW-5 and MW-6D) were <br /> installed during this time. See SECOR's 'Site Assessment Report' dated <br /> December 12, 2003, <br /> 10/30/03 Routine quarterly groundwater monitoring and sampling began on this date. <br /> 06/02/04 Installation of one groundwater monitoring well (MW-7), one oxygen injection test <br /> well (S-1) and one groundwater extraction well (EX-1) occured on this date. See <br /> SECOR's 'Results of Site Assessment, Feasibility Testing and Site Conceptual <br /> Model Report' dated September 30, 2004. <br /> 06/21/04 SECOR conducted an oxygen injection test this date, but they did not follow their <br /> work plan. Citing a very small radius of influence SECOR concluded that oxygen <br /> injection was not a feasible remedial alternative for this site. See SECOR Report <br /> dated September 30, 2004. <br /> 07/26/04 Two groundwater monitoring wells (MW-8 and MW-9) were installed offsite on <br /> this date. See SECOR Report dated September 30, 2004. <br /> 08/02/04 Two CPT Borings (CPT-1 and CPT-2) were installed on this date. See SECOR <br /> Report dated September 30, 2004. <br />