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SEACOR R September 18, 1992 S E P 2 2 1992 i ENVIRONMENTAL HEALTH PERMIT/SERVICES i Ms. Mary Meays ' San Joaquin County Public Health Services 1601 East Hazelton Avenue Stockton, California 95201 ' REVISED QUARTERLY STATUS REPORT FOR 429 WEST LOCKEFORD STREET, LODI, h CALIFORNIA, SITE # 1354 Dear Ms. Meays: On behalf of Mr. Mardee Kidd Science & Engineering Analysis Corporation (SEACOR) is pleased I to submit this revised status report summarizing activities conducted at the above referenced site from June 1, 1992 to August 28, 1992. This revised status report supersedes our status report dated September 3 1992. We are submitting a revised status report because we recognized that certain data, including updated water quality data and estimated amount of hydrocarbons removed were inadvertently missing from the September 3, 1992 report. We apologize for this inconvience. #: During this time, SEACOR performed quarterly groundwater sampling of the existing groundwater . monitoring well and continued operating a soil vapor extraction system. The details for each of these activities is provided below. . QUARTERLY GROUNDWATER MONITORING On August 12, 1992,SEACOR collected a groundwater sample from monitoring well MW-1A. Prior to sampling of the well, SEACOR measured the depth to groundwater in the well using an electronic .; water level indicator. Groundwater was measured at a depth of 46-83 feet below ground surface. Groundwater sampling was conducted in accordance with the procedures described in SEACOR's technical report dated June 11, 1991. A copy of the water sample field data sheet is attached. The groundwater sample, identified as MW-lA-0892 was submitted to GTEL Environmental Laboratory (GTEL) of Concord, California for analysis of total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene and xylenes (BTEX) in accordance with EPA methods 8015,modified and 8020. The results of the current sampling event as well as historical groundwater quality data are presented in the attached Table 1. A complete laboratory report and chain-of- custody record are also included as an attachment to this report. As shown in Table 1, the only analyte detected during the current sampling event was xylenes (total) at a concentration of 0-8 micrograms per titer (µg/1) or parts per billion (ppb). These results are consistent with groundwater quality data from May 1992 and further indicate that fuel hydrocarbon concentrations in groundwater underlying the former underground storage tank have decreased to 3 non-detectable or trace levels. BTEX concentrations remain well below the State of California Maximum Contaminant Levels (MCLS) for drinking water_ 4A„ 100 Pine Street y AUG.QSRdC 50014-001-05 MK01 Suite 2025 San Francisco, CA 94111 (415)296-7877 (415)677-9694 FAX