SITE INFORMATION AND CORRESPONDENCE

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y: r i DESCRIPTION OF WORK IN CALTRANS RIGHT-OF-WAY, NORTHBOUND I-5 OFF RAMP AT BENJAMIN HOLT DRIVE The San Joaquin County Environmental Health Department(County)requested that ARCO define the extent of hydrocarbons in the groundwater to the west and south of the ARCO site located at 2908 Benjamin Holt Drive. On March 17, 1993 BC submitted a letter to Caltrans requesting permission to install one groundwater monitoring well in the Caltrans right-of-way between the northbound I-5 off ramp and the ARCO facility. This request was verbally denied by Caltrans citing safety as the reason for denial.; On July 1, 1993, BC personnel requested a written denial of the access from Caltrans. BC has not received a written denial. ARCO installed two groundwater monitoring wells on the westernmost portion of the ARCO property in an attempt to define the lateral extent of hydrocarbons in the groundwater to the west. Groundwater samples collected from the well on the southwest portion of the site indicate that hydrocarbons are present in the groundwater to the southwest of the ARCO site beneath the Caltrans property. The County has again requested that a groundwater monitoring well be installed in the Caltrans right-of-way to define the extent of hydrocarbons in the groundwater. The monitoring well would be installed in the location shown on Figure 1. The monitoring well would be constructed as illustrated in Figure 2. The well installation will take approximately 8 hours and the well would be sampled on a quarterly basis. Well sampling takes about one hour to complete each quarter.