ARCHIVED REPORTS_XR0003972 - Laserfiche WebLink

Home Browse Search

R E E i_V"?EvirD, June 5, 1992 JUN 8 1992 SEACOR ENVIRONMENTAL HEALTH PERMIT/SERVICES Mr. Stephen Schneider San Joaquin County Public Health Services 1601 East Hazelton Avenue Stockton, California 95201 QUARTERLY STATUS REPORT FOR 429 WEST LOCKEFORD STREET, LODI, CALIFORNIA, SITE # 1354 Dear Mr Schneider: On behalf of Mr. Mardee Kidd, Science & Engineering Analysis Corporation (SEACOR) is pleased to submit this status report summarizing activities conducted at the above referenced site from March 1, 1992 to May 31, 1992. During this time, SEACOR performed quarterly groundwater sampling of the existing groundwater monitoring well and installed and initiated operation of a soil vapor extraction system. The details for each of these activities is provided below. QUARTERLY GROUNDWATER MONITORING On May 13, 1992, SEACOR collected a groundwater sample from the existing monitoring well MW- IA. 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 46.20 feet below ground surface. Groundwater sampling was conducted in accordance with the procedures described in SEACOR's technical report dated June 11, 1991. The groundwater sample, identified as MW-1A 5192 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. As a quality assurance measure, a trip blank accompanied the groundwater sample and was subsequently analyzed by GTEL for the same parameters as the groundwater sample. The results of the current sampling as well as historical groundwater quality data are presented in the attached Table 1. A complete laboratory report and chain-or-custody record are also included as an attachment to this report. As shown in Table 1, the only analyte detected in the groundwater sample during the current sampling event was toluene at a concentration of 0.6 micrograms per liter (ag1Q)or parts per billion (ppb). Comparison of the current sampling results with historical groundwater quality data indicate a continued decreasing trend in hydrocarbon concentrations in groundwater underlying the former underground storage tank. BTEX concentrations have all decreased to concentrations well below -{ the State of California Maximum Contaminant Levels (MCLS) for drinking water. No analytes were detected above the laboratory reporting limit in the trip blank associated with the groundwater sample. The next quarterly groundwater monitoring event is scheduled for August 1992. ` afT MAY.QSR 100 Pint'Streal 50014-001-05 MK01 lg ~ Suite?035 1 San Prtmc-isco, CA 94111 (415)290-7877 iy151(i77-9(194 F,AX •-