ARCHIVED REPORTS_FIELD NOTES AND PERMITS THROUGH 4_4_1997

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06/14/87 13:23 0312 877 2561 ZHGM CHICAGO ,. ,�J003 • ZEVNIK HORTON GUIBORD & MCGOVERN Donald T. Bradshaw, R.G. Levine•FrickeelZecon Inc. August 14, 1997 Page 2 LPL has also noted that LFR has suggested that the San Joaquin County Public Health Services/Environmental Health Division("SJC PHS/EHD") may request that TYR grout the CPT/PIPP borings after 8:00 a.m. To the extent that this may be required,LFR should minimize the impact on Lincoln Center by maintaining only those support vehicles necessary to complete the grouting. It is LPL's understanding that only one support vehicle is needed to perform the grouting activities. LPL has the following comments with respect to the proposed CPT/PIPP procedures set forth in LFR's August 8, 1997 correspondence. At least one groundwater sample and pore pressure dissipation test should be conducted in the shallow saturated interval in the proposed boring (35 to 50 ft bgs). In prior Phase T IRA CPT/PIPP investigations, no groundwater samples were collected from the center of the plume in the shallowest water-bearing zone. Groundwater quality data from this shallow zone, along with information on the water table depth, are critical to an adequate understanding of the nature and.extent of contaminationintended to be controlled by the Phase I IRA remediation system. LFR stated in paragraph two of its August 8, 1997 correspondence that "if a permeable sand layer is present at or near 110 feet bgs, the boring may be continued until the base of the permeable layer is encountered and an underlying low permeability layer is identified..." (emphasis added). LPL believes that the boring should be continued until the specified conditions are met. This will allow the cxtcnt�of the more permeable,layers beneath Lincoln Center to be more accurately defined, a jn LFR stated in paragraph four of its August 8„1997;correspondence that"tests [pore pressure dissipation] will be run until excessive pore pressures appear to have dissipated and quasi- static pressure conditions have been reached, or a maximum of 30 minutes have passed (emphasis added]." LPL believes that these tests should be run until a minimum of 30 minutes have passed, if quasi-static pressure conditions are not reached prior to_ ,shat time. The grant of accessleontained herein is conditioned,upon the understanding that the work to be conducted will proceed,with all deliberate,haste, while simultaneously observing the requirement contained in the Permanent Injuncdon,and the First Final Consent Decree that the Settling Dry Cleaning Defendants ("SDCDs"),must, to;the,maximum extent practicable, not interfere with the operation of Lincoln Center or with the operation of the business of any tenant of Lincoln Center. In conclusion, LPL is granting the SDCDs access for these activities as an accommodation to the Special Master, in spite of the fact that the Special Master has not determined that the SDCDs are, in full compliance with the insurance requirements of the Permanent Injunction and the First Final, Consent Decree. In the event that the Special Master AUG 14 197 11:26 312 977 2561 PAGE.03