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�� Proposed Monitor Well Locations California State University Stanislaus,Stockton,CA December 3,2001 Page-2- quantified as kerosene, diesel, and motor oil by EPA Method 8015M; for BTEX by EPA Method 8020; and for gasoline oxygenates/additives by EPA Method 8260. The gasoline oxygenates/additives include Methyl tertiary-Butyl Ether(MTBE), ethanol, tertiary-Butanol, Di-isopropyl ether(DIPE), Ethyl tertiary- Butyl Ether (ETBE), tertiary-amyl Methyl Ether (TAME), ethylene dibromide (EDB), and 1,2- dichloroethane (1,2-DCA). The analytical methods, analytical detection limits, and analytical results are presented in Table 1,attached. Recommendations The laboratory analytical results for soil and groundwater samples collected during a previous investigation in December 2000 are presented in Tables 2 and 3, attached. Based on the results of the current and previous soil and groundwater investigations, Condor recommends the installation of three shallow groundwater monitor wells at the site. The proposed monitor well locations are shown on Figure 2, attached. The monitor wells will be installed to a total depth of approximately 47 feet. This depth should permit the wells to penetrate the first water bearing zone without penetrating the clays between the first water bearing zone and the water-bearing zone below.Monitor wells will be installed using a hollow- stem auger method with 8-inch diameter augers. Each well will be constructed with 20 feet of 2-inch diameter schedule 40 PVC machine slotted screen. Two-inch diameter schedule 40 PVC blank casing will be installed from the screen to the ground surface. A filter pack of#3 Monterey sand will be installed to approximately 2 feet above the screen. Approximately two feet of bentonite pellets will be placed above the filter pack and hydrated with potable water. A seal of neat cement will be tremied into the annulus from the top of the bentonite to the ground surface. A traffic rated vault box and locking cap will be installed at the surface. The monitor wells can be installed on December 10 and 11, 2001. These are the only days the drilling contractor has available in 2001 to install the wells. A well permit application will be submitted to the San Joaquin County Public Health Services/Environmental Health Department on December 4, 2001. If you have any questions or need additional information, please contact us at(209)234-0518 Respectfully submitted, CONDOR EARTH TECHNOLOGIES,INC. DF. �F�l '�Z '�;'//V. �!�� Lee H. Morse No. U30 onald F. Kresse Staff Geologist �Q California Registered CGeologist(#6430) Attachments: Figure 1 Vicinity Map Figure 2 Site Map with Proposed Monitor Well Locations Table 1 Groundwater Sample Analytical Results—November 2001 Table 2 Groundwater Sample Analytical Results—December 2000 Table 3 Soil Sample Analytical Results—December 2000 cc: Mr. David Rosso, California State University,Office of the Chancellor Mr. Victor Takahashi, California State University Stanislaus Mr. Paul Pickering, California State University Stanislaus P:\.3024 CSUS-Multi-Campus\Reports\Proposed MW Locations 12-03.doe %44� i CONDOR