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f <br /> CHRONOLOGY <br /> RUIZ GROCERY <br /> 4491 W DURHAM PERRY ROAD <br /> TRACY CA 95376 <br /> 12/14/87 Two slant soil borings advanced under underground storage tank#1, <br /> proposed to close tank in place. Soil contamination discovered at levels <br /> up to 8,400 mg/kg TPHg and 89 mg/kg benzene. <br /> 12/16/87 New domestic well installed onsite; 185 feet deep, 100 foot grout seal: <br /> 01/29/88 UAR and Prop 65 #88-0014 filed this date. <br /> 04/26/88 Old domestic well (68,feet deep) destroyed. <br /> 05/27/88 Monitoring Well #1 installed this date, located between the underground <br /> storage tanks and the onsite domestic well. <br /> 02/28/89 Two 1000-gallon underground storage tanks removed this date under <br /> permit and inspection. Soil samples for analysis were collected. Results <br /> of the analyses were positive for petroleum hydrocarbons at levels up to <br /> 28,000 mg/kg TPHg and 230 mg/kg benzene. <br /> i <br /> 08/13/91 Site entered into Local Oversight Program this date. <br /> 1 <br /> 08/28/91 MW-2 and MW-3 installed this date. <br /> 07/16/93 Site received Letter of Commitment from the SWRCB. <br /> 10/21/93 Installation of six hydropunch soil borings (HP-1 thru HP-6)for the <br /> collection of soil and grab groundwater samples. Installation of three <br /> vapor extraction wells (VW-1, VW-2; VW-3). Soil contamination reported <br /> in 15 foot bsg samples from the VW borings. See "Soil and Groundwater <br /> Investigation" report dated 1126194, by RESNA <br /> 07/19/94 Installation of four monitoring wells (MW-4, MW-5, MW-6 and MW-7). <br /> See "Summary Letter Report, Supplemental Soil and Groundwater <br /> Investigation (July 1994)" dated 912/94, by RESNA. <br /> 04/07/95 Installation of one recovery well and two air sparge wells, see report <br /> "Par, Feasibility Study and Remedial Action Plan" dated 2121196. <br /> 12/21/95 Pilot test, report in "PAR, Feasibility Study and RAP" dated 2/21/96. <br /> 04/22/97 Installation of vapor extraction well VW-4. See "Quarterly Groundwater <br /> Monitoring Report-Second Quarter 1997 and Vapor Well Installation <br /> Report" dated 5/26197. <br /> II <br /> 4 <br />