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AdIk KLEINFELDER File No. 20-3978-01.W 10 July 26, 1997 Kleinfelder's recommendations were: 1. Evidence of potential groundwater impacts was found at both disposal areas. One additional round of groundwater monitoring for general minerals, metals, and volatile organics should be obtained to confirm findings made from the first sampling. 2. Two additional soil samples should be collected from the soils beneath the Site B disposal area to assess if contaminants are present is soils immediately beneath the waste. 3. A formal submittal should be made to the regulatory agencies (RWQCB andL A) in order to obtain a written response from the agencies addressing how they intend to regulate the facility. This submittal would consist of the first five chapters of this document plus an new chapter describing development plans for the property. 4.10 Former UST Locations (File No. 20-3978-O1.W11) Based on the results of the subsurface assessment conducted in this area, Kleinfelder had the following recommendations detailed in our report "Limited Phase II Soil and Groundwater Assessment, Three Former Underground Storage Tank Locations, (Portions of Phase I ESA Recommendation Numbers 9 and 10), Former Spreckels Sugar Plant No. 2, 18800 South Spreckels Road,Manteca, California, (APN#221-180-04)"dated February 24, 1997: 1. Because only trace concentration of xylenes were detected in two of the fourteen soil samples obtained from the former underground gasoline storage tank areas, Kleinfelder would recommend no further investigation or clean-up in the former UST areas. 2. Because only trace levels of xylenes and toluene exist in the soil and groundwater respectively of the potential "historic oil tank area," Kleinfelder recommends no further investigation or clean-up. Furthermore, it is unknown if the tank was ever actually installed. Magnetometer surveys of the area show a number of utilities which mask the area. However, it is unlikely that a tank exists. 3. The existing soil cuttings (a.k.a.... drilling returns) should be evaluated and properly disposed of by Atherton Kirk Development. Kleinfelder can assist the Atherton Kirk Development in that disposal at the Client's request at an additional cost. 4. The equipment rinseate should be properly evaluated and disposed of by Atherton Kirk Development. Kleinfelder can assist Atherton Kirk Development in that disposal at the Client's request at an additional cost. 20-3978-01.WI0/1017LI55 Page 26 of 50 Copyright 1997,Kleinfelder,Inc.