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i <br /> �d �1 <br /> t <br /> l <br /> Port of Stockton `"r <br /> General Offices: P.O. Box 2089, Stockton, CA 95201-2089 <br /> (209) 946-02461 FAX(209) 465-7244 or(209)466-5986 <br /> February 24, 1999 <br /> Transmitted Via Facsimile 209-464-0138 <br /> Ms. Carol Oz, REHS <br /> Senior Environmental Health Specialist <br /> San Joaquin County Public Health Service <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95202 <br /> Re: Addendum to "Work Plan for Additional Subsurface Site <br /> Investigation for Petroleum Hydrocarbons" - Site Number 3, Site <br /> Code 1282-124 <br /> Dear Carol: <br /> The Port of Stockton (Port) hereby submits this addendum to the above- <br /> referenced work as the result of the conference call between you, Phil Ross, and <br /> myself on February 22, 1999. As agreed during our call, the primary change to <br /> the Work Plan is to revise the screened intervals of the three monitoring wells at <br /> the site in lieu of adding a fourth well, which the Port strongly believes is not a <br /> justified cost from a technical stand point. The primary purpose for revising the <br /> intervals is to provide better coverage of the soils and groundwater that <br /> contained detCCtaole levels of petroleum hydrocarbons during the iai.i.wl <br /> subsurface investigation. The following describes the revised screened intervals <br /> and the rationale used to select these intervals. <br /> In the subject Work Plan, the proposed screened interval for each of the <br /> three wells was from 5 to 25 feet below ground surface (bgs). This was in <br /> response to our meeting with you and Margaret Lagorio at the Public Health <br /> Service/Environmental Health Division (PHSIEHD) office in December 1998, in <br /> which PHSIEHD requested that the uppermost portion of the screened interval be <br /> placed 5 feet above the water table. However, as you correctly pointed out in our <br /> conference call, the bottom of the screened interval would not reach the lowest <br /> depth at which PHCs were detected in groundwater during the initial investigation. <br /> In a call to Mr. Ross on February 16, 1999, you suggested that the Port install an <br /> additional (fourth) well with a screened interval from 30 to 35 feet bgs. <br /> GENERAL OFFICE: 2201 W. WASHINGTON ST., STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA <br />