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�1 <br /> 500 East Grant Line Road <br /> Chronology Page 308/04/97 <br /> 05-18-89 PHSIEHD received correspondence prepared by Kaprealian Engineering directed to the CVRWQCB, <br /> Kaprealian was responding to CVRWQCB correspondence dated April 17, 1989, <br /> 08-18-89 NOR sent indicating that Mobil Oil was the primary responsible party, <br /> 1990 <br /> 02-07-90 PHSIEHD correspondence informing Mobil that the site had been placed into the Local Oversight i <br /> Program(LOP). <br /> + I <br /> 03-13-90 Mobil correspondence acknowledging that the site was placed into the LOP. <br /> 04-05-90 PHSIEHD permit#90-800 issued this date for monitoring wells. <br /> 1991 <br /> 04-15-91 Mark III correspondence requesting clearance of the site prior to the City of Tracy issuance of a <br /> building permit. <br /> 04-22-91 PHS/EHD permit#91-0800 issued this date for off site monitoring wells. <br /> 1 <br /> 04-30-91 PHS/EHD witnessed the grouting and installation of AW5 -AW8 installed off site. <br /> 05-01-91 PHSIEHD finaled permit#91-0800. PHS/EHD finaled permit#90-800, Four monitoring wells had <br /> been installed(AW 1 -AW4) Stove pipe completion 2-2.5'above grade. <br /> 05-07-91 PHS/EHD witnessed the sampling ofAW1 -AW8. AW5 AW8 developed this date. <br /> 07-11-91 Mobil correspondence includedthe "Site Characterization Report" dated June 27, 1991 and prepared l <br /> by Alton. <br /> 08-21-91 PHSIEHD inspection of sampling event. <br /> i <br /> 08-26-91 Alton correspondence included manifests for water disposal on 5-31-91. ' <br /> 08-28-91 Mark III correspondencel included the development summary, preaquisition site assessment, <br /> development conditions and.a final parcel map. <br /> 09-03-91 NOR sent indicating that Tracy Venture,Buzz Oates was an additional responsible party. <br /> I <br /> 09-05-91 PHSIEHD correspondence"commented on the "Supplement Site Investigation" dated July 9, 1991 <br /> and prepared by Alton. PHSIEHD requested disposal documentation from the 1990 excavation. <br /> Requested lab report, additional off site.investigation, and submittal of a PAR by September 30, <br /> 1991. <br /> k <br /> 09-16-91 Alton correspondence responded to PHSIEHD correspondence dated September 5, 1991. Copies of <br /> the soil manifests were included. Analytical reports and chain of custodies which were requested <br /> were included. The soil sample`results from B2 probably reflected the depth to the former capillary i <br /> fringe zone. Subsurface soil at the depth is silty clay which will favor strong capillary force. i <br />