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NOW E3Q0N COMPANY, U.S.A. P.O.ROX 4415-HOUSTON ,TEXAS 77210-4415 MARKETING DEPARTMENT 'j \ b•' REAL ESTATE 8 ENGINEERING 'i9Rg J .M. KERR, JR . P .G. SENIOR ENVIRONMENTAL GEOLOGIST ANL I1 C>• CERTIFIED MAIL EN fiERiJI�l/SER�iOES RECEIPT REQUESTED July 20, 1988 Former Exxon R/S 7-3942 4444 North Pershing Avenue Stockton, California 95207 Mr. David L. Brent California Regional Water Quality Control Board 3443 Routier Road Sacramento, California 95827-3098 Dear Mr. Brent: Exxon' s consultants have completed the Phase II investigation at the referenced location. Based on the soil and water analyses from all the monitoring wells, the groundwater gradient, the stratigraphy of the area and past hydrological events, the data indicates that there are probably two plumes of contamination on the former Exxon site. The first plume originates from the area of the Shell tankfield, extends under North Pershing and across the Northwest corner of the former site. The second plume originates in the area of the old Exxon tankfield and extends northeast past MW6. These two plumes apparently co-mingle somewhere northeast of MW2. Based on this new data, Exxon intends to work with the property owner and perform the following activities: 1 ) Perform a pump test to determine the optimum design of a remediation system which will address the second plume. 2) Obtain all the necessary permits to install and operate a remediation system. 3) Install a system which will not hinder the future proposed use of the property when it is operating. In the interest of the property owner, Exxon does not propose to operate the system until a similar system is installed on the Shell property to remediate the first plume and stop further migration of contamination down gradient, under North Pershing and onto the former site. A DIVISION OF EXXON CORPORATION