SITE INFORMATION AND CORRESPONDENCE FILE 2

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Cal Tank Lines - - 3 - January 30, 2012 Remediation Summary • Free Product: Free product noted in MW-2 (up to 4.65 feet). Between January 2000 and present, reportedly 26.4 gallons of free product has been removed. Free product continues in February 2011; 4.65 feet of free product in MW-2. • Soil Excavation: None noted • In-Situ Soil Remediation: No soil remediation has been conducted • Groundwater Remediation: No groundwater remediation has been conducted General Site Conditions • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, silt and clay. The depth to groundwater varies seasonally between 24 and 30 feet bgs and the groundwater gradient is east southeast at approximately 0.001 ft/ft • Residual Mass of Free Product: Taber Consultants, estimates that 55 gallons of free product remain near MW-2 • Groundwater Trends: There are more than 12 years of groundwater monitoring data for this Site. Benzene trends are shown below, source area (MW-2) and down gradient (MW-4) BENZENE Results for MW-2 ,s 1s 14 1 12 10 J, 11 - - i► J \ 2 / r o / --BENZENE --- Trend BENZENE Results for MW-4 4000 3500 3000 2500 2000 1500 �--- - 1000 500 0 y d' .. BENZENE --- Trend Sensitive Receptor Survey A Sensitive Receptor Survey (SRS) was conducted in 2010 by Taber Consultants. A records search at the Department of Water Resources and an on-the-ground survey in the area identified three water supply wells within a 2,000 foot radius of the Site: 2943 South Harris Street, 3506 Harvey Street and 3436 South Odell. The nearest well is 860 feet from the site. Drinking water at and near the Site, including residents at the above addresses is currently supplied by the California Water Service Company of Stockton.