SITE INFORMATION AND CORRESPONDENCE_FILE 1

Home Browse Search

STATL OF CALIFORNA GEORGE DEUKMEJIAN,Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— fes; CENTRAL VALLEY REGION „ 3443 ROUTIER ROAD i SACRAMENTO,CA 95827-3098 t �allr L.o L; 26 October 1987 (a8V b 1387 ENVIROMENTAL HEALTH I ERv117/8ERVICES - Mr. James M. Kerr, Jr. P.G. Environmental Geologist EXXON Company, U.S.A. 1200 Smith Street, Suite 1050 Houston, Texas 77002 PROBLEM ASSESSMENT WORK AT THE FORMER EXXON STATION NO. 7-3942, 4444 NORTH PERSHING AVE, STOCKTON, SAN JOAQUIN COUNTY As discussed at the 19 October 1987 meeting, staff review of the subject report did not result in concurrence with the conclusions contained therein. Further investigation is required and a cleanup proposal/time schedule is needed. Enclosed. is 1) a memorandum with staff comments on the subject report and recommendations of additional work required to complete the problem assessment phase for this site, and 2) a memorandum containing guidelines on the objectives to be met during each phase of an underground tank investigation. At the meeting and in previous conversations you have indicated Exxon's desire to complete the sale of the site and to allow the new owner to begin construction. The Regional Board has no control over the sale of your property other than to assure that you or the new owners will be required to cleanup the contaminated groundwater resulting from the operation of the service station previously located at the site. Exxon and the new owner should be aware that if development of the site impedes the efforts and/or effectiveness of site assessment and cleanup work, additional and potentially more costly assessment and mitigation measures may be necessary. As discussed in th,e attached memo and agreed upon at our meeting, further monitoring wells are necessary downgradient of the site to determine the extent of the contaminated groundwater. At the meeting you proposed installing an additional four monitoring wells, including at least one upgradient well located such that it may substantiate Exxon' s claim of another source. The proposed location and construction of the wells should be submitted for our approval before beginning construction. To expedite work we will give our comments and approval., if appropriate, over the phone.