ARCHIVED REPORTS_XR0003568 - Laserfiche WebLink

Home Browse Search

CAL INC Corporate Office 2040 Peabody Road Suite Vacaville CA 95687 95687 7071446 7996 FAX 707/446-4906 April 7, 1999 Van Nuys � 1999 7949 Woodley Avenue Mr Chris Brown Suite 138 Project Engineer, Environmental Services Van Nuys CA 91406 J g l=NV1RO1Vti1FT,,I rq[ I-}EALTN 818/375 5071 ABF Freight System, Inc PF0M1TISrRVECE$ FAX 818/375 5051 P O Box 10048 Stockton Fort Smith, AR 72917-0048 343 East Main Street Suite 404 Stockton CA 95202 RE; Report on the results of additional sampling of groundwater from three 2091942-2008 FAX 209/9442 2638 monitoring wells lls on March 19> 1994> at 2747 West Yosemite Avenue, s Manteca CA Petaluma Dear Mr Brown 599 Tomales Road Bldg 160 Petaluma CA 94952 On March 19, 1999, CAL INC collected a confirmatory round of groundwater samples from 7o7ns2 saga rY In' P FAX 707ns2 4088 the three monitoring wells installed at the site of a now-removed underground storage tank Indiana (UST) at your operations at 2747 West Yosemite Avenue, Manteca, CA This letter reports Grissom ARB IN 46791 the results of the analyses of these samples for the petroleum hydrocarbon parameters The 7651689 9053 results confirm that the UST removal site is eligible to be considered by San Joaquin County authorities for closure Genera!Construction . BACKGROUND Environmental Remediation .A 10,000-gallon underground tank used to store diesel fuel was removed by CAL INC from 2747 West Yosemite Avenue, Manteca, CA (`the site', see Figure 1) on March 18, 1998 Environmental Groundwater and soil samples were collected from the UST excavation and excavation Engrnearrng stockpiles under the supervision of Messrs Michael Kith and Robert McClellan, Inspectors Environmental for the San Joaquin County Public Health Services, Environmental Health Division (SJCo Training PHS/EHD) Groundwater was intersected at a depth of 10 5 feet below grade in the 11-foot deep excavation It had an obvious oily sheen and a distinct petroleum hydrocarbon odor Environmental Petroleum hydrocarbon-stained soil was observed on the floor of the excavation The tank Database Tracking showed signs of leakage on the ends and had pitting on its underside The results of analysis of the soil and groundwater samples collected from the excavation and stockpile after UST removal are summarized in Table 1 below Two groundwater samples were collected from the floor of the excavation, one Just after the UST was removed (Sample Excavation 11'), the other after purging the groundwater(Sample Pit Water) Total Petroleum Hydrocarbons as diesel fuel (TPH-D) were detected in both samples (53 and 41 mg/L, respectively) Neither sample contained concentrations of benzene above the method detection limit However, the Pit Water sample contained concentrations of toluene, ethylbenzene and xylenes above the method detection limits The two soils samples from the groundwater/soil interface in the wall of the UST excavation, and the sample from below the diesel fuel dispenser, contained concentrations of TPH-D, benzene, ethylbenzene, toluene and xylenes (BETX)that were below the method detection limits However, the two soil samples from the excavated material stockpile contained minor to moderate • concentrations of TPH-D (220 and 35 mg/kg)