SITE INFORMATION AND CORRESPONDENCE

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Kearney-KPF HAR Quarterly Report -3- 6 July 1990 LEA is the Public Health Services Department of San Joaquin County. They should be contacted to determine what requirements may be necessary for their permit. Hydrogeologic Assessment Report (HAR) Kearney-KPF was originally notified that a HAR was required by the Toxic Pits Cleanup Act (TPCA) by letter dated 14 January 1986. Kearney-KPF submitted their original HAR in June 1986. This report was found to be deficient in several areas and the facility was notified by letter dated 22 August 1986. Since that time, the outstanding deficiency of the HAR was the descri tion of the vadose zone beneath the surface impoundment, as required by §25208.8(i). Because of the thorough soils investigation in the area cf the surface impcundments, the data contained in the SAR meets the requirements of this Section. Therefore, Kearney-KPF is considered to have completed their HAR and have met the requirements of §25208.8 of the TPCA. March 1990 Quarterly Report The March 1990 Groundwater Quality Quarterly Report was submitted by Hargis and Associates on 7 June 1990. The report revealed that there were significant increases in VOC concentrations from the previous quarter. The total VOC concentrations from wells in the intermediate zone increased from 512 micrograms per liter (µg/1) to 1022 µg/1 in KI-5 and from 1990 µg/l to 2475 µg/l in KI-6. These ground water samples had the highest concentrations of VOCs at the site. The primary drinking water standard (DWS) for 1 , 1-dichloroethylene (1 , 1-DCE) was exceeded in the sample from KI-4. The proposed primary DWS for 1 , 1-dichloroethane (1 ,1-DCA) and the primary DWS for 1 ,1-DCE, tetrachloroethylene (PCE) , 1 , 1 ,1-trichloroethane (1 , 1 , 1-TCA) and trichloroethylene (TCE) were exceeded in the samples from KI-5 and KI-6. These high concentrations of VOCs in KI-5 and KI-6 continue to indicate that the VOC contaminant plume in the intermediate zone of the aquifer appears to have moved off-site to the north. Total VOC concentrations in the sample from KD-4 increased from 1 .4 µg/l to 53.7 µg/l from the previous quarter. The primary DWS for 1, 1-DCE and PCE were exceeded in this sample. The significant increase in VOC concentrations is probably due to the pumping influence from the off-site supply well CWS-77. None of the other deep monitor well ground water samples have had VOC concentrations on this order of magnitude in recent quarterly sampling rounds. This trend must be closely monitored to determine if the increase in VOC concentration continues and ultimately whether the deep aquifer zone must be remediated. If these elevated VOC concentrations continue to be found in the deep zone, the installation of additional monitor wells will be required. CKW:gs Attachment