SITE INFORMATION AND CORRESPONDENCE

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i CHRONOLOGY SAFEWAY MEAT PROCESSING PLANT 1111 NAVY DRIVE STOCKTON, CA 95203 01/30/87 Tank #2 leak discovered during tank test. 02/05/87 Unauthorized Release Report (UAR) filed. 04/07/87 Soil borings B-1 to B-9 were advanced around the tank area. Soil samples were collected and analyzed. Highest results were 1, 100 mg/kg of TPH from B-2 sample at 20.7 feet below surface grade (bsg) . 07/07/87 Four 12, 000 gallon diesel underground storage tanks (USTs) State ID #6445001, 6445002, .6445003, 6445004 were removed and transported to H & H Ship Service Company, 220 China Basin Street San Francisco, and disposed to Sanitary Land Fill, San Francisco. A concrete slab was beneath the USTs, at about 13.5 feet bsg. Water entered the excavation and was about 9 feet bsg. A grab water sample was collected. Only Xylene at 1.1 ug/1 was detected. A Prop-65 was filed. 08/12/87 3 monitoring wells MW-1 to MW-3 were installed around the former tank area. Analytical results of the soil samples collected were non detect. The boring logs indicate water was at about 18 feet bsg. Monitoring well screens were MW1 25 to 35 feet, MW2 23 to 33 feet and MW3 25 to 35 feet. Gradient was to the northwest. Analytical results of the water samples from the wells were non detect. 01/22/88 Five soil samples were collected from the sidewalls of the excavation. Analytical results showed the highest concentration of TPH was in the southwest corner of the excavation (3700 ppm) . 1/23-24/88 750 cubic yards of pea gravel- (that had been placed back in the excavation after the USTs were removed) were removed from the excavation and placed elsewhere on the site for aeration with other soil generated during the UST removal. 03/14/88 Two soil samples were collected from the sidewalls of the excavation. The sample from the northeast corner of the excavation was non detect for contaminants. The sample from the southwest corner was 420 ppm. 03/17/88 Soil samples (8-11)were collected beneath the cement slab at the bottom of the excavation after coring through the. slab. Only four of the samples were analyzed and the highest concentration of TPH was in SL-D (56 ppm) . It was decided that the contamination was around the perimeter of the slab not beneath it so the concrete slab was allowed to remain in place. 7/26-28/88 150 cubic yards of contaminated soil were excavated along the southern and western walls of the existing tank pit as- deep as 24 feet bsg and placed with the other stockpiled soil and pea gravel, bringing the combined volume of pea gravel and stockpiled soil to 1,200 cubic yards. Eight soil- samples were collected from the excavated area. The highest concentration was 3700 ppm in TP21-15 from the southwest .part of the excavation. Water was 23 feet bsg.