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3 • • PLEASE ADDRESS REPLY TO: T' ! ENVIRONMENTAL SERVICES POST OFFICE BOX 1211 EY MODESTO, CALIFORNIA 95353 MCVALL !'i0VKR,S�. PHONE: (209) 572-5518 FAX: (209) 572-5298 September 22, 1994 Mr. Isaac Kaing California Regional D Water . Quality Control Boardr ' Central Valley Region f 3443 Routier Rd. Suite A S E P 9-Sacramento, CA 95827-3098 194 ENVIRONMENTAL HFAI< H Dear Mr. Kaing: PERMIT/SERVICES On September 19, 1994 at 0730 hrs a release of an unknown amount of process water to the Mokelunme River from Tri Valley Growers(TVG),Plant T,was discovered. The process water entered theN Mokelumne River by way of break in a levy on a TVG discharge field which than entered a . stormwater/irrigation tail water ditch and pump station. TVG believes the release to have begun sometime -- in the late evening or early morning of September 18/19. The release was contained and the leak stopped by 0830 hrs the same day. By 1100 hrs the process water that remained in the ditch had been pumped back to TVG discharge fields and the obstruction in the ditch to prevent water flow had been removed. Visual inspection of the river at 1045 hrs. at the point of discharge and down stream showed no deleterious effects from the addition of the process water. No fish kills, odor,or discoloration of the river were observed. Water samples were taken of the river at the point of discharge as well as,process water samples from TVG discharge fields. The samples were taken to J&L Analytical in Modesto for testing. Total Dissolved Solids,Total Suspended Solids, BOD, COD, Electrical Conductivity, and pH were requester/of each of the samples. A 96 hour flathead minnow bioassay was requesters of the river sample. I will share the results of these tests with your office as soon as they are returned. At 1015 hrs on September 19, 19941 notified your office of the event by way of voice mail and we spoke later the same day. Doug Wilson of San Joaquin County Department of Health Services, Bev Vicory of the California Department of Fish and Game and the San Joaquin County Office of Emergency Services were also notified of the incident as a courtesy. Tri Valley has stepped up its surveillance and maintenance of the levies in its discharge fields to prevent this from occurring in the future. TVG does not believe that this release has caused any harm to the Mokelumne River due the relatively small amount of process water that was added to the River in proportion to the high volume of watei.that the river maintains. If TVG can provide additional information or answer any questions please call me at (209) 5725514. Sincerely, Christopher J. Savage Supervisor, Environmental Services 101 California Street, San Francisco, California 94111-5804 Post Office Box 7114, San Francisco, California 94120-7114 Phone:(415) 837-4000 Telex:27-9046 FAX:(415)837-3900