SITE INFORMATION AND CORRESPONDENCE_1998-2000

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Lincoln Center Page 2 January 1998 surface is allowed to accommodate unimproved parcels,so that when subsequent grading occurs the integrity of the grout is maintained. This does not infer that a void should exist between the asphalt patch and the grout. PHS/EHD notified Levine-Fricke-Recon Gregg In-situ staff that from this point forward PHS/EHD would be contacted prior to asphalt patching to make a final inspection of the grout and would be notified when field staff changes were made. PHS/EHD soon began having problems with having to make re-inspections of boreholes which PHS/EHD was informed were ready for final inspection,when in fact,they were not. Levine-Fricke-Recon developed steel plates which fit over the boreholes so that traffic cones were no longer necessary to leave over the boreholes awaiting final inspection. The steel plates reportedly satisfied some concerns of the property owner,regarding traffic safety and visual distractions. The plates also allowed PHS/EHD to make final inspections prior to asphalt patching on a less frequent basis. However,it seems that Levine-Fricke-Recon had some concerns regarding off site traffic levels on San Joaquin County roadways and the dangers which the steel plates may pose. The latest final inspection of new CPT/PIPP boreholes was scheduled to occur during the daytime hours on November 26, 1998;however,daytime access to perform this check was denied by the property owner. The final check was subsequently scheduled for December 2, 1997,during evening hours when a three hour minimum charge is required for FHS/EHD inspections. To date,a notification and verification methodology has not been established. Finally,PHS/EHD is unsure if staff access to observe the results of permitted activities is restricted to evening hours only. PHS/EHD requested that the drilling contractor,Gregg In-Situ and Levine-Fricke-Recon schedule an opportunity for PHS/EHD observe the grout depth beneath the asphalt patch of PHS/EHD selected boreholes,as had been done with TEG and pursuant to the San Joaquin County Well Construction and Destruction Standards section 13.17.11 which states that"Verification shall be made to determine that an adequate seal has been installed by a EHD representative." PHS/EHD was subsequently provided with a summary of the boreholes which have been advanced which included a proposed quality control survey. The re-inspection activities were finally scheduled for November 24, 1997 and after waiting over one and one- half hour in the evening,Gregg in-situ drilling staff arrived and informed PHS/EHD and Levine-Fricke-Recon staff that their management directed them to not remove any asphalt patches so that the grouts could be checked. PHS/£HD has been informed by Levine-Fricke-Recon staff that the CPT/PIPP grout checking would be performed during the next phase of investigation when the drilling equipment was again regularly on site. PHS/EHD has agreed to allow sand to be used to backfill boreholes in which the grout has dropped less than 3 feet below ground surface,prior to asphalt patching. PHS/EHD would hope that final inspections can be scheduled so as to minimize the amount of re-inspections during the evening. PHS/EHD has been informed that field activities,once permits have been issued will resume during the evening of January 12, 1998. FHS/EHD will continue to perform grout inspections of all pilot borings,well installations or well destructions. If I can provide additional information,please do not hesitate to contact me at (209) 468-0337. Donna Heran,Director,REHS Emmental Health Division G p -^ Mary Meays,Semor REHS Margare gorio,REHS J Site Mitigation Unit Supervisor cc: Wendy Cohen,Central Valley Regional Water Quality Control Board Wilbur H. Smith II,Lincoln Properties,Ltd. Donald T.Bradshaw,Levine-Fricke-Recon, John M. Gregg,Gregg In-Situ, 950 Howe Road Martinez CA 94553