SITE INFORMATION AND CORRESPONDENCE_1998-2000

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PUBLIC HEALTH SAVICE SAN JOAQUIN COUNTY ?, ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.P.H., Health Officer . 304 East Weber Avenue, Third Floor• Stockton, CA 95 2 -, v 209/468-3420 BARRY WILLIAMS JAMS/ENDISPUTE FJAN 0 81998 TWO EMBARCADERO CENTER STE 1100 SAN FRANCISCO CA 94111 Re: Lincoln Center Project As you are aware,San Joaquin County has a Well Ordinance and which requires the permitting of wells and soil borings and the inspection of grouting activities,pursuant to the adopted well standards. San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD) is the delegated agency to implement the well standards. PHS/EHD indicated in correspondence dated May 21, 1997,that due to the time of day that on site work must be performed,PHS/EHD has elected to perform spot inspections of the vapor sampling points and CPT/PPIP work that utilizes push point technology. FHS/EHD has made numerous attempts to ensure that all CPT/PIPP and vapor points were grouted to the surface prior to asphalt patching by the drilling contractor,without PHS/EHD final inspection of each borehole. PHS/EHD made verbal agreements with Levine-Fricke-Recon ,Gregg In-situ and TEG field staff regarding the time to ensure that the grout placed in boreholes does not significantly drop prior to the placement of dry cement in the boreholes and asphalt patching. Once dry cement is placed within the boreholes and asphalt patched,it is more difficult to access the boreholes to verify that there are no voids between the patch and the grout. During the June 5/6, 1997 inspection,PHS/EHD requested that TEG remove some of the vapor borehole asphalt patches,so that grout depths could be observed. The boreholes grouts had dropped greater than 12 inches beneath the asphalt patches and FHS/EHD requested that the boreholes be topped off and that the drilling contractor,TEG,check the prior boreholes to verify that there was grout beneath the asphalt patches. A new procedure was established whereby the contractor would top off the boreholes several times during the evening before asphalt patching at the end of the shift. On June 10, 1997,PHS/EHD performed a re-inspection and verified that those boreholes which had insufficient grout depths had been re-grouted and that the new procedure was observed by TEG. PHS/£HD also performed a spot check of grouts of previous boreholes and found grout beneath all the asphalt patches which were removed. On July 1, 1997,following the resumption of CPT/PIPP drilling,PHS/EHD discussed with the Levine-Fricke-Recon and Gregg In-situ field staff the new procedure which had been agreed upon for grouting with TEG. On July 11, 1997,PHS/EHD performed a follow-up CFT inspection and a pilot boring grouting inspection and was informed by another Levine-Fricke-Recon field staff that the drilling contractor,Gregg In-situ,was waiting 30 minutes to ninety minutes before asphalt patching each borehole. On July 12, 1997,PHS/EHD performed another follow- up CPT inspection and a monitoring well grout inspection. PHS/EHD observed that Gregg In-situ field staff, under the supervision of still another Levine-Fricke-Recon field staff, had finished the grouting of FIFF-25 in less than 30 minutes. Clearly,the agreed upon methodology was not adhered to by Gregg In-situ field staff. After further verbal communication with Levine-Fricke-Recon staff,it was agreed that a check would be performed of the field work which was initiated on June 29, 1997 to determine if similar problems existed with the CPT/PIPP grouting as was observed with the vapor boreholes grouting. On July 15, 1997,PHS/£HD staff met with Levine-Fricke-Recon and Gregg In-situ field staff to observe the grout depths beneath the asphalt patches. Numerous boreholes had dropped greater than 3 feet below ground surface. Pursuant to San Joaquin County Well Construction and Destruction Standards section 13.I7.7 "Exploratory borings,installed for sampling purposes,shall be completely grouted with appropriate sealing material. The top 3 feet of the boring may be backfilled with clean,uncontaminated fill material." A grout to within 3 feet from the A Division of San Joaquin Counry Heakrh Cue Scrvica