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Chevron U.S.A. Products Company <br /> 2409 E. Main Street, Stockton CA. <br /> Page 4 <br /> Corrective Action Regulations (Title 23, Division 3, Chapter 16, Article 11, Section 2723) <br /> require complete assessment for contaminated sites fully defining the lateral and vertical extent <br /> of contaminant distribution. The removal of all potential sources, the extent of rubble and the <br /> overall dimensions of the former tank pit are primary objectives prior to sampling. In order to <br /> achieve this full definition goal and maintain consistency with tank closure sampling performed <br /> since August 10, 1990 (Tri-Regional Board Staff Recommendations for Investigation of Tank <br /> Sites) also currently applied and required in the PHS/EHD Application for Permit to Close <br /> UST's Storing Hazardous Materials (enclosed along with a Service Request form for your <br /> convenience), the rubble in the former UST excavation may be required to be removed since it <br /> is unlikely that slant borings could achieve this objective ( a maximum of 2 to 4 feet bgs) at all <br /> points below the former tank pit footprint. In conversations with Chevron and Hinaman Trust <br /> (August 12, 1996) representatives it is likely that all the debris in the former tank pit will be <br /> required to be removed for the following reason. Selectively removing debris as a means to <br /> sample native soils will likely require large volumes of rubble to be removed since the debris <br /> is prone to fall into the pit as excavation proceeds requiring additional debris to be removed <br /> repeatedly. If required, debris removal, disposal, and backfill of these areas shall be in <br /> accordance with all applicable regulations. <br /> In closing, considering the EA report, professional opinions of MARK, observations of <br /> PHS/EHD staff, and verbal agreements by Chevron to consider the above comments (August <br /> 12, 1996), PHS/EHD, in accordance with corrective action regulation issues a directive to <br /> submit an amendment to the workplan which addresses the above deficiencies and conditions no <br /> later than August 30, 1996. <br /> Should you have any questions please contact Ronald Rowe, Senior REHS at (209) 468-0342. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> � <br /> Ronald Rowe, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> RR <br /> enclosures <br /> cc: CVRWQCB - Beth Thayer (w/o encl.) <br /> cc: SWRCB/USTCF - Ismael Jacobo (w/o encl.) <br /> cc: HINAMAN TRUST - Sherman Hinaman (w/o encl.) <br /> - David ChinChen (w/o encl.) RON\WORKPLAN\2409chev.wp <br />