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STATE OF CALIFORNIA—ENVIRONMENTAL PR( TION AGENCY PETE WILSON,Govemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION —_ <br /> 3443 ROUTIER ROAD,SUITE A <br /> SACRAMENTO,CA 95827-3098 - <br /> PHONE: (916)255-3000 0112M ���� <br /> FAX: (916)255-3015 <br /> 0810POwwaintn <br /> 2 September 1994 SEP o s M4 <br /> OCT U 6 1994 <br /> RECEIVED <br /> Mr. Darrell Scott ENVIRONMENTAL HEALTH <br /> City of Tracy PERMIT/SERVICES <br /> 3900 Holly Drive <br /> Tracy, California 95376 <br /> DRAFT PLAN CITY OF TRACY WASTEWATER TREATMENT PLANT <br /> HOLDING PONDS INVESTIGATION, SAN JOAQUIN COUNTY <br /> We have completed our review of the Draft Plan. The proposed approach for determining the <br /> infiltration rate and TDS loading into ground water, appears reasonable. <br /> We request the following changes and additions: <br /> 1. The evaporation pan and corresponding weather measuring devices should be placed at <br /> the holding ponds, if feasible. <br /> 2. Ground water(GW) elevation contours and concentration plots must be developed from <br /> the data measurements made from the five City of Tracy monitoring wells. <br /> 3. Compare available GW elevation data from adjacent facilities, i.e., Leprino pretreatment <br /> ponds, Holly Sugar, etc.; and regional ground water elevation data. <br /> 4. Add bicarbonate concentration measurements to analyses to be performed on monitoring <br /> wells. <br /> If you require any additional information please call me at(916) 255-3030. <br /> MICHAEL H. MOSBACHER, P.E. <br /> Project Engineer <br /> MHM <br /> cc Mr. Charles S. Elliot, Jr.; CH2M HILL, Sacramento <br />