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:,ZA 1'. r STATE OF CALIFORNIA"—HEALTH' AND WELFARE AGENCY GEORGE DEUKMEJIAN, Governor DEPARTMENT OF HEALTH SERVICES 31 E. CHANNEL STREET, ROOM 270 STOCKTON, CA 95202 } (209) 948-7697 0 _ o r November 7, 1986 NOV 10 lab ENVIROMENTAL HEALTH PERMIT/SERVICES Richard C. Prima, Jr. Chief Civil Engineer City of Lodi 221 W. Pine Street Lodi-, CaliforniaY 95241 PROPOSED SITE FOR WELL NO. 22 The information which the City of Lodi submitted under cover of your letter dated October 28, 1986, concerning the proposed site of Well No. 22, has been reviewed. The' separation of the site from sewage hazards appears to be 1 satisfactory. , The analyses performed by Anlab and submitted with the well site proposal indicate that the water sampled at the depth of 165 feet is already contaminated with a detectable concentration of DBCP. Although the 0. 08 mg/1 concentration does not exceed the Department's current action level, the District has several concerns relevant to the City's plans to utilize the water from the contaminated aquifer. DBCP was originally placed in the upper few inches of the soil at high rates of application. The analysis of the water at the 93 foot depth shows that enough DBCP has migrated to this depth to render the water unfit for healthful consumption. The detection of DBCP at the 165 --�f oot 4depth shows' that the- fumi ant hasalread g y'-estab3 shed-" an avenue of migration to the 165 foot depth. As a result, it is probably that the concentration of DBCP at the 165 foot depth will increase with time, further compromising the quality of the water in the deeper aquifer. In addition, the Department is now in the process of establishing a maximum contaminant level (MCL) to replace the action level which currently exists for DBCP in drinking water. All indications are that the MCL will be considerably lower than the current action level. As a result, the City could find that the water produced by Well No. 22 may exceed the MCL in the future, resulting in the