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r , r December 1, SEACOR1992 ,luerll'.;r,:C.infrurtrlir,ra - �=�-- �''>, Ms. Mary Ways San Joaquin County Public Health Services MAY 0 3 1501 East Hazelton Avenue _ r" Stockton, California 95201 �l/lRQri� E I ; 1' H QUARTERLY STATUS REPORT FOR 429 WEST LOCKEFORD STREET, LODI,CALIFORNIA, r = =sF• SITE # 1354 Dear Ms. Meays: On behalf of Mr. Mardee Kidd, Science& Engineering Analysis Corporation (SEACOR) is pleased rr-t_ to submit this quarterly status report summarizing activities conducted at the above-referenced site . from September 1, 1992 through November 30, 1992 and activities anticipated to occur during the next quarter. During the past quarter, SEACOR performed quarterly groundwater sampling of the f: existing groundwater monitoring well and continued operating a soil vapor extraction system. The : f details for each of these activities is provided below_ L.• f QUARTERLY GROUNDWATER MONITORING iOn November 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 47.06 feet below ground surface. Current and historical depth to groundwater measurements are included in Table 1. s_ ' 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-1A-1192 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 2. A complete laboratory report and chain-of- custody record are also included as an attachment to this report. As shown in Table 2, the only analyte detected during the current sampling event was xylenes (total) at a concentration of 0.7 micrograms per liter (µg/P) or parts per billion (ppb). These results are consistent with groundwater duality data from the previous sampling event (September 1992) and further indicate that fuel hydrocarbon concentrations in groundwater directly underlying the former underground storage tank have decreased to non-detectable or trace levels. BTEX concentrations remain well below the State of California Maximum Contaminant Levels (MCLS) for drinking water. Nov.QSR 50014-001-05 MK01