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I CAL July 26, 1999 Corporate Office 2040 Peabody Road Suite 400 Mr Chris Brown AUG 0 w 1999 Vacaville CA 95687 Project Engineer,Environmental Services 707/446-7996 ABF Freight System, Inc ENVlRUNMENTAL HEALTH FAX 707/446-4908 P O Box 10048 PERMIT/SERVICES I Petaluma 599 Tamales Road Fort Smith, AR 72917-0048 Bldg 160 Petaluma CA 94952 RE. Closure Report for ABF Freight Terminal located at 2747 West 707/782-3484 IFAX 707/762-4088 Yosemite Avenue in Manteca,CA IndianaDear Mr Brown Gnssom ARB IN 46791791 765/689-9053 I On July 8, I999 CAL INC abandoned three monitor wells (see Appendix A - Figure 1) at the ABF Freight facility located at 2747 Yosemite Avenue in Manteca, California The work was General Construction conducted under pen-nit from the San Joaquin County Public Health Services Environmental I Health Division(see Appendix B—Regulatory Agency Documentation) Environmental Remediation BACKGROUND I Environmental One 10,000-gallon diesel fuel underground storage tank (UST) was removed by CAL INC on Engineering March 18, 1998, under the oversight of the EHD Grab groundwater samples collected from the bottom of the excavation after the UST was removed indicated that total petroleum hydrocarbon I Environmental compounds in the diesel fuel range were as high as 53 milligrams per liter (mg/1), and TPH-d Training concentrations in stockpiled soils were as high as 220 milligrams per kilogram (mg/kg) Although excavation sidewall samples collected just above the water table at about 1 I-feet below Environmental ground surface(bgs)were reported as non-detect for all target analytes, additional subsurface soil Database Tracking and groundwater sampling was mandated by the EHD to insure that soil and groundwater quality beyond the confines of the former excavation did not pose a threat to potential nearby sensitive receptors On August 20, 1998, CAL INC installed three (3) soil borings at the site One soil boring was placed near the center of the former UST excavation, and the other two borings were placed approximately 35-feet northwest and 40-feet northeast of the former UST (see Figure 1) The I groundwater flow direction in the vicinity of the site was reported by the Manteca City Municipal Water District to be towards the northwest prior to installing the soil borings Soil samples were collected for laboratory analysis from each soil boring at 5-foot sample intervals to total depths of 25 5 and 30-feet bgs Each soil sample was analyzed for TPH-d, as well as benzene, toluene, ethylbenzene and xylenes (BTEX compounds) All soil samples were reported as below laboratory method detection limit concentrations for the above analytes Once the soil samples had been collected from each soil boring, the three boreholes were completed as 2-mch diameter monitor wells Groundwater beneath the site/resided between 10 and 11-feet bgs during borehole installation, so the wells were screened from 5 to 25-feet bgs I Groundwater samples were collected from the three monitor wells on August 24, 1998, and analyzed for TPH-d and BTEX compounds Analytical laboratory results of the three groundwater samples were reported as below method detection limit concentrations for all target I analytes Based on these results, CAL INC recommended site closure from the EHD The EHD concurred the site is a likely candidate for closure, however, they required that one additional groundwater sampling round be conducted before they would recommend case closure for the site(see EHD correspondence in Appendix B) On March 19, 1999, CAL INC sampled the three monitor wells as required by the EHD Analytical laboratory results of the groundwater samples indicated that all Target analytes were below method detection limit concentrations As a result, the EHD issued a case closure letter for the site(see Appendix B), and the monitor wells were scheduled for abandonment I