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CHRONOLOGY page 2 1617 W. Fremont, Stkn. 1 10/30/95 ARCO/EHD quarterly meeting held. MI request a groundwater investigation work plan at "T-14".area based on field notes and obvious soil contamination. 1996 01/25/96 Report of over-excavation and soil sampling received. Soil sample "T-14" at 1.5 feet below ground surface ('bgs) records TPH-G at 360,000 mg/kg. . Benzene in this sample at 5,600 mg/kg. After further over-ex, 7-14K soil sample in same area at deeper point (11.5 'bgs) records TPH-G at <50.0 mg/kg and Benzene at 0.087 mg/kg. Report indicates 35 cubic yards removed and transported offsite but no manifest included. 01/30/96 EHD/ARCO quarterly meeting held today. Based on threat to groundwater, MI will require groundwater investigation and site is to have a single monitoring placed at area "T-14/T-14A". A work plan is to be submitted. 04111/96 Margaret Lagorio (ML) generate comment letter from 1130 meeting and sends it off today. ARCO to submit a MW installation work plan. 05/06/96 MI sends off comment letter requiring work plan for single well to be submitted by June 15, 1996, and field work to start by July 1, 1996. MI will require TPH-G, BTEX, and MTBE in soil and groundwater samples. Well to be sampled for two consecutive quarters and site to be evaluated for further investigation or additional well placements or closure. 06/12/96 Fax'ed request for work plan submittal extension received. MI approves to July 1, 1996 with condition that work be completed by end of July, 1996. 07/26/96 Permit application and $89 fee recd today along with site safety plan. Woodward Drilling to do work on Tuesday July 30th. Apt set. 07/30/96 Monitoring well 1 installed today. Geologist "Wendy " reports slight soil contamination. MI witnesses only bentonite and grout placement. Fifteen feet (15") of 0.02" well screen placed from 10 to TD of 25'bgs. i