SITE INFORMATION AND CORRESPONDENCE_3

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' r - Chronology Del Monte Disco Gas Station 110 N. Filbert Street, Stockton San Joaquin County Geotracker Global ID#: T0607700499 04/01/76 Del Monte purchased large site from ParmacEast LLC. Eight underground storage tanks_(UST's) spread out across many locations. Three 10,000 gallon located far south of plant at former gas station built by ParmaEast -1965. Del Monte claims to not have used/operated any of the USTs. The three USTs at the former Disco Gas Station originally designated USTs #6, #7, & #8 then re- designated to UST #1, #2, and #3 as this site split off from original parcel when Myrtle Street relocated. New address assigned to Disco Gas Station, 110 N. Filbert Street. Original Del Monte property and five other USTs stay with original address 2716 E. Miner and remain as another LOP site, receiving NFA in January 16, 1992. 10/24/85 Disco Gas UST's #1, #2, & #3 removed this date under permit and inspection of the Environmental Health Department. Soil samples were collected beneath only one UST (northem-#3) since odor and discoloration noted. Analytical results in Exceltech Incorporated's Tank Excavation Report dated December 10, 1985 on file with the EHD Unit III confirms petroleum release. 10/13/89 Unauthorized Release Form, #89-U33 filed for site. 12/11/90 Date of Notice of Reimbursement (NOR) sent to Del Monte Corporations as site enters Local Oversight Program. 07/23/91 Monitoring wells MW-DIS-1 through MW-DIS-6 and MW-DIS-7S& MW-DIS-7D, to soil gas borings SG-1 through SG-16, and soil borings SB-DIS 1 to SB-DIS-7 09/18/91 installed onsite. Soil and groundwater data from borings and monitoring well's first groundwater sampling event, September 4, 1991 included in CH2M Hill's Remedial Action/Feasibility Study-Volumes 1 &2 dated February 26, 1992. 01/21/92 UST piping (-100 feet) removed this date. EHD Unit III witnesses soil samples SP-1 through SP-5 from trenches and stockpiled soil samples ES-1 through ES- 3. Data in CH2M Hill's Underground Pipe Removal and Investigation Results dated March 16, 1992. 08/19/93 Date of CH2M Hill's Quarterly Groundwater Quality Monitoring Results and Conceptual Remediation Plan concluding soil vapor extraction (SVE) and insitu air sparging (IAS) as the remediation alternative at the site 11/18/93 Date of the EHD correspondence approving SVE and IAS as the interim remedial action. 11/28/94 SVE/IAS nested wells AS/SVE-1 and AS/SVE-2 and NP-1 and NP-2 wells to installed onsite. 01/19/95 01/04/95 Date of NOR naming ParmacEast LLC, pre Del Monte landowner, as an additional responsible party.