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EA Engineering,Science, Technology EA Western Regional Operations <br /> 41 Lafayette Circle <br /> Lafayette,CA 94549 <br /> Telephone:510-283-7077 <br /> Fax:510-283-3894 <br /> 24 November 1992 I V <br /> DEC 1 1992 <br /> Harlin Knoll <br /> ENVIRONMENTAL HEALTH San Joaquin County Department of Health Services PERMIT/SERVICES <br /> 1601 East Hazelton Avenue <br /> Stockton, California 95201 <br /> RE: Separate phase hydrocarbon recovery at former Exxon 4r7-3942,4444 Pershing Avenue, <br /> Stockton, California <br /> Dear Mr. Knoll: <br /> As you requested in our phone conversation on 19 November 1992,I am sending you a cut-sheet <br /> describing the hydrocarbon skimmers EA plans to install in the wells that currently contain separate <br /> phase hydrocarbons at the above mentioned site. The hydrocarbons are recovered through a <br /> hydrophobic membrane that allows only hydrocarbons to pass through it and be recovered. The <br /> skimmers are suspended in the wells with a line that is attached to the well caps. The well boxes <br /> are secured in the normal fashion to prevent tampering or vandalism of the wells. A technician will <br /> empty the skimmers on a weekly basis. The recovered hydrocarbons will be stored on site in a <br /> secondarily contained 55 gallon drum. The drum will be kept within the fenced enclosure currently <br /> at the site. <br /> The skimmers will be ordered this week and should be installed in the wells during the second <br /> week of December. Performance of the skimmers will be reported in quarterly reports. <br /> If you have any questions regarding the installation or use of the skimmers, please contact me at <br /> the above number. <br /> Sincerely, <br /> LIZ r�i-'--- � <br /> Douglas Oran <br /> Project Engineer <br /> cc: Marla D. Guensler- Exxon Company U.S.A. <br />