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THRIFTY OIL CO . <br /> March 29, 1999 0.9290 <br /> 4,141 <br /> Mr. Michael J. Infurna Jr., <br /> Senior REHS <br /> San Joaquin County Public Health Services - "PHS-EHD" <br /> Site Mitigation Unit IV I LOP <br /> 304 E. Weber St., fifth floor <br /> Stockton, California 95202 <br /> Subject: Summary of site inspection held on March 17, 1999 <br /> RE: Thrifty Oil Co. Station#171 <br /> 1250 N. Wilson Way <br /> Stockton, California <br /> Mr. Infurna: <br /> This letter is to confirm the items discussed during your site inspection and meeting with Mr. Jeff <br /> Suryakusuma of our office at the above-referenced site on March 17, 1999. Previously on March <br /> 2, 1999,you sent us a fax identifying several unknown 24-inch diameter traffic boxes onsite that are <br /> concern items in regards to adequate sealing against surface water (or other liquid) infiltration. <br /> During the March 17, 1999, Mr. Suryakusuma and yourself identified these six traffic boxes and <br /> concluded that the existing map that was used does not depict the correct locations of the wells <br /> and/or well boxes onsite. Upon individual inspections of the six traffic boxes (numbered#1 through <br /> 46 in your fax dated 03102199) and other wells, the following are concluded: <br /> 1. Box #1 appeared to be a conductor casing with evidence of soil boring (most likely TDD-5). <br /> Since the boring's backfill has subsided several feet, it was agreed that this box will be <br /> abandoned by taking about one foot of the top materials,backfill a few inches with gravel,then <br /> capping it with concrete, flush to the surrounding concrete. Since this box is installed within the <br /> UST slab,it is agreed that the wellbox ring can be left in place to protect the integrity of the slab. <br /> 2. Box #2 is a 12" diameter PVC SCH 40 conductor casing. It is agreed that the annular space <br /> between the conductor casing and the box's skirt will be capped with cement/concrete to prevent <br /> surface liquid infiltration. Also, the conductor casing will be capped/plugged 1 sealed against <br /> liquid entering the casing. <br /> 3. Box #3 is apparently used for boring TB-5. This box is to be backfilled and resurfaced with <br /> concrete to flush with the surrounding concrete. Since this box is installed within the dispenser <br /> island's slab, it is agreed that the wellbox ring can be left in place. <br /> 4. Box#4 is an empty well box with only a 2" lateral piping for future extraction well for the soil <br /> remediation system on the side of the well box. It is agreed that this future pipe will be extended <br /> IF13539 E.Foster Rd., Santa Fe Springs,CA 90670-0138 9(562)923-9876 <br />