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MEMORANDUM CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION 3443 Routier Road, Suite A Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 TO: Antonia Vorster FROM: Richard McHenry DATE: 6 March 1990 SIGNATURE: AC�4� SUBJECT: SOUTHWEST HIDE COMPANY, MANTECA, SAN JOAQUIN COUNTY At your request, I have reviewed the letters from Southwest Hide dated 22 and 29 December 1989. The letters were in response to your 28 November 1989 comments on their Beneficial Use and Remedial Action Report (August 1989). My comments are as follows: 1. The two old production wells were abandoned on 5 and 6 September 1989 as was approved by our office (13 July 1989). 2. The requested water quality data from the "new" monitoring wells was submitted on 17 January 1990. This data and any further sampling data should be used in updating the Remedial Action Report (RAR). 3. The brine recycling system is scheduled to be operational by July 1990 and testing complete by September 1990. 4. The vertical extent of pollution has not been defined. Data from the new monitoring well (MW-78) at a depth of 140 feet is not conclusive because the well is screened in both the silt and underlying sand stratas. The consultants 22 December 1989 letter states that the vertical plume "can" be examined by a 150 foot monitoring well , yet a proposal for the well and a time schedule for its construction is not included. Their Cleanup and Abatement Order requires that the areal and vertical extent of groundwater pollution be determined. The Order also requires the preparation of pollutant isoconcentration contours for comparison to ground water potent i oTetr,c/f l off! maps. 5. The consultants letter dated 22 December 1989 states that arrangements have been made to: 1. perform a pump test to determine aquifer transmissivity and vertical continuity. 2. investigate the on-site production well by televising the well casing, since a well log does not exist. The well should be sampled and utilized in the above aquifer pump test.