Laserfiche WebLink
Mr. Michael Collins <br /> Page 2 <br /> ( October 19, 1992 <br /> SF031604.P3 <br /> As reported in the RI/FS, benzene was found to exceed the hazardous waste Toxicity <br /> Characteristic Leaching Procedure (TCLP) level for benzene of 500 µg/1 in Monitoring <br /> Wells MW-DIS-1 and -2. Benzene concentrations in Monitoring Wells MW-DIS-I, -2, -3, <br /> and -71) have exceeded the California Maximum Contaminant Level (MCL) for benzene of <br /> 1 µg/1 <br /> A schedule of groundwater monitoring and remedial activities planned at Del Monte Plant <br /> 33 was submitted to Mr. Steven Schneider of San Joaquin County Public Health Services <br /> on May 14, 1992. Del Monte is currently proceeding with the activities outlined in this <br /> letter. <br /> GROUNDWATER MONITORING/QUALITY <br /> The quarterly monitoring event conducted on October 1, 1992 consisted of water level <br /> measurements and groundwater sampling. Water level depths were measured in monitoring <br /> wells MW-DIS-2 through MW-DIS-7S and MW-DIS-7D. Monitoring well locations are <br /> shown on Figure 1. Water level elevations from this quarter and previous monitoring <br /> l events are summarized on Table 1. MQ1iltcarng +ell -D1«,1 vex la! at It <br /> appears that MW-DIS-1 may have been covered with a few inches of soil during removal <br /> of concrete rubble from the Del Monte Disco property. A metal detector will be used to <br /> locate:the vault boy of'MW-DIS 1 during. the next gUarterly I�t�ring event. <br /> Monitoring wells MW-DIS-3, -4, -6, -7S, and -71) were sampled on October 1, 1992 as <br /> part of the quarterly groundwater quality monitoring program. The groundwater samples <br /> were analyzed by the CH2M HILL Analytical Laboratory for total petroleum hydrocarbons <br /> (TPH) as gasoline; and benzene, toluene, ethylbenzene, and xylenes (BTEX) (EPA method <br /> 801518020). Results of the October 1, 1992 sampling event and results from previous <br /> sampling events are summarized on Table 2. The laboratory report from the October 1, <br /> 1992 sampling event is also attached. <br /> FUTURE ACTIVITIES AND SCHEDULE <br /> Future monitoring and remedial activities planned for Plant 33 and the scheduled dates for <br /> each activity are shown on Table 3. Although not shown on the table, remediation and <br /> monitoring activities will continue beyond January 1994. The schedule will be updated as <br /> necessary. <br /> quarterly.rep <br />