SITE INFORMATION AND CORRESPONDENCE_FILE 1

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I i t During the tank replacement project, all below surface remediation piping necessary for vapor extraction and air sparging was installed. Recent approval from the San Joaquin Valley Air Pollution Control District to use an alternative air emission abatement device at facility #434 in Lodi will allow ARCO to transfer the air emission abatement unit from the Lodi facility to this facility in the near future. Fac. #760, 225 S. Cherokee Lane, Lodi PHS/EHD requested that additional investigation west, north and east of the waste oil tank be performed . Also, additional assessment was requested in the area of the new tank complex and groundwater monitoring wells were requested to be installed. ARCO has supplied the following reports to the PHS/EHD since the 3/93 meeting : a) Addendum to the Work Plan for installing groundwater wells , dated 12/8/93, b) Status Report, First Quarter ' 94 dated 6/8/94. ARCO installed three groundwater monitoring wells at the site in late January , 1994 . ARCO attempted to obtain access agreements from the City of Lodi and a neighboring property owner to characterize the extent of contamination north and west of the former waste oil tank. Ms. Pamela Martinez was mailed access agreements on 5/11 /93 and 6/15/93 . ARCO has not received a response from her. The City of Lodi denied ARCO access into the alley, although ARCO named Lodi as an additional insured , because Lodi was planning to sell the alley property to the adjacent property owners . Thus , due to refusal from off-site property owners , ARCO has not been able to characterize north and west of the former waste oil tank. Well MW-3 characterizes the area immediately east of the former waste oil tank. ARCO has investigated the need for additional assessment in the area of the current product tanks. Seven soil samples were obtained at a depth of 12 feet which is the base of the current tank excavation. Only one sample detected TPHg concentrations above the detection limit of 1 . 0 ppm and had a concentration of 1 . 4 ppm. Two earlier soil borings within this area had nondetect soil samples at depths of 15 and 20 feet. Additionally, soil samples from these borings did not create readings on the PID meter. ARCO installed well MW-2 adjacent to the tank complex in January of 1994. Soil data indicate that soil contamination in this area was restricted to two vertically limited zones at 21 . 5 feet and 36 . 5 feet. ARCO has also allocated funds to purchase an air emission abatement treatment unit for this site. ARCO expects delivery of this unit later this year. Fac. #6080, 85 E. Louise, Lathrop PHS/EHD requested that the existing monitoring wells be sampled yearly at a minimum . The monitoring wells at the site are scheduled to be sampled during August of 1994.