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i r t f STATE OF CALIFORNIA-Environmental Protectionncy PETE WILSON, Govemor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION 4� Of 3443 Routier Road,Suite A Sacramento,CA 95827-3098 PHONE:(916)255-3000 FAX:(916)255-3015a�rn RECT .., ' 5 November 1996 NOV 0 6 1996 ENVIH0NMENT,P,1 . HEALTH PERMIT ; SE-iVICES Mr. Verrill Norwood Pioneer Americas, Inc. 116 Sunburst Lane, N.W. Cleveland, TN 37312 HYDROPUNCH INVESTIGATION, DRAFT CLEANUP AND ABATEMENT ORDER, ALL PURE CHEMICAL COMPANY, TRACY, SAN JOAQUIN COUNTY We have reviewed the 27 September 1996 report entitled Hydropunch Investigation submitted for the All Pure Chemical Company (All Pure) facility in Tracy. The investigation was conducted according to the 5 June 1996 Work Plan for Ground Water Investigation submitted by All Pure. We did not approve the June work plan because it did not include sampling groundwater beyond the boundaries of the All Pure facility to the north-northeast as requested in our 20 March and 14 May 1996 letters. All Pure conducted the work proposed in the work plan without Board approval in order to justify installing monitoring wells offsite the facility. As part of the hydropunch investigation, All Pure collected soil and groundwater samples for laboratory analyses from each of eight borings. Soil samples were collected from just above the shallow water table. Chloroform concentrations in three groundwater samples collected from the northeast perimeter of the All Pure facility ranged from 1,200 µg/1 to 2,660 µg/1. One groundwater sample collected near the southeast comer of the fenced portion of the facility contained 36.2µg/1 chloroform, two groundwater samples from the area south of the fenced portion of the All Pure property contained chloroform at concentrations greater than 2,500 µgll, and two of the samples in the latter area had no detectable chloroform. Soil samples corresponding to each of the groundwater samples which had detectable chloroform all contained low levels of chloroform. Likewise, soil samples corresponding to the two groundwater samples which had no chloroform also had no detectable chloroform. Groundwater from only one of the hydropunch samples collected along the northeast perimeter of the facility contained carbon tetrachloride at a concentration of 268 gg/l. None of the soil samples collected contained carbon tetrachloride. Specific comments discussed below are in reference to the noted sections of the report.