FIELD DOCUMENTS AND WORK PLANS 1992-1999

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i STATE OF CALIFORNIA—ENVIRONMENTAL Pik CTION AGENCY • PETE WILSON, Governer I CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD- a CENTRAL VALLEY REGION3443 ROUTIER ROAD, SUITE A SACRAMENTO, 95527-3098 PHONE: (918) 25555-3000 FAX: (916) 255-3015 RECEIVED NOV 13 1992 5 November 1992 ENVIRONMENTAL HEALTH Mr. Thomas P. Kroehle President Marley Cooling Tower Company 5800 Foxridge Drive Mission, Kansas 66201 STOCKTON FACILITY - REVISION OF PERFORMANCE MONITORING PLAN AND USE OF THE HACH METER FOR INFLUENT ANALYTICAL METHOD This letter is in response to your letter dated 1 October 1992, asking for a revision in the Performance Monitoring Program (PMP) schedule, and a letter dated 18 September 1992 from Tom Hickey of Black and Veatch requesting to use on-site Hach meters as the sole means of measuring influent contaminant concentrations. We continue to be concerned with Marley's apparent lack of ability to maintain plume capture and the continued violations of chromium in the discharge to the Stockton Diverting Canal . The current Performance Monitoring requirements for evaluating the cleanup efforts at the Marley, Stockton facility include the following: 1. Water level measurements in all wells are to be measured quarterly. 2. All monitoring wells are to be sampled in January and in July. 3. All reclamation wells and key monitoring wells identified in the PMP are to be sampled in April and in October. 4. Water level data obtained prior to initial start-up will be compared to quarterly water level data obtained during the operation of the remedial wellfield. 5. Water level data is to be used to evaluate the capture zones of the reclamation wells in the different hydrostatic subunits. 6. Analytical results for total dissolved chromium detected in the ground water are to be used to evaluate performance of the remedial wellfield. 7. A Performance Evaluation Report is to be prepared annually, however, recommendations for changes to the remedial wellfield or performance monitoring should be incorporated into quarterly reports. 8. Due to changes in ground water flow direction there are insufficient monitoring wells to the south and east of the Marley site. In our letters of 13 May 1992 and 24 January 1992, we noted that additional monitoring wells are needed east of MW-426 and MW-214 to document successful capture of soil flushing water and control of the regional ground water plume. These deficiencies should be addressed now.