COMPLIANCE INFO_FILE 2 - Laserfiche WebLink

Home Browse Search

MEMORANDUM CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION 3443 Routier Road Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS: 8-495-5600 TO: Gary Reents FROM: John Tomko I � DATE: 26 May 1989 SIGNATUR • "tel I i SUBJECT: Southwest Hide Investigations Moldenhauer Engineering Company submitted, on 17 May 1989 , the additional information that we requested on the ongoing site investigation at the Southwest Hide Company site. The additional investigations planned for the potential soil contamination site, the abandoned wells, and the existing brine handling system all appear sufficient. The pump test will be preceded by slug tests on several existing wells. The consultant ' s plan is to assess the data from these slug tests and the results of the abandoned well investigations in order to design a pump test that would maximize the use of existing wells. A full scale pump test is scheduled for early June. The consultant does not agree with our recommendation that an additional deep (140 ft. ) monitoring well be installed adjacent to monitoring well #2 . He argues that the deep well proposed adjacent to the existing monitoring well cluster #7 and #7A, will provide information necessary to determine the need and proper design for additional deep wells. The need to delineate the vertical extent of contamination is crucial in determining the remedial action for this site. The Remedial Action Plan must b2 sub.,,ittau by i August 19ts9 . The consultant acknowledges that additional deep wells may be required following the analysis of water samples from the proposed deep well, but there may not be sufficient time to install them and meet our 1 August 1989 deadline in the Cleanup and Abatement Order. Since the on-site production well is contaminated and assumed to be at least as deep as the proposed deep well, it is reasonable to assume that this 140 foot interval is contaminated. The areal extent of contamination at the water table will be sufficiently known following this next phase of the field work. However, it is unlikely that the vertical extent will be known, and this could delay the submittal of the RAP. I recommend that the assessment of the abandoned wells and the installation of the proposed deep well be given priority and that the