ARCHIVED REPORTS XR0001834 - Laserfiche WebLink

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�4 A review of past groundwater petroleum hydrocarbon concentrations was made and included in the tabulations presented in Table 4 No limit of the petroleum hydrocarbon contamination plume has been identified The past maximum areal extent of the groundwater petroleum hydrocarbon plume as determined from Figure 6 and 7 suggests the site to have a minimum areal extent of approximately 200 by 225 feet(45,000 square feet) Based on review of past analytical data obtained from Geological Audit Service, Inc, 1991 and Booth (1994 a,b,c,d,and e) the highest concentrations of volatile organic compounds (VOC's) at the site are found near PT-MW-3 and within the southern portion of the site It appears that the petroleum hydrocarbon compounds have migrated offsite, most likely to the southwest of the site The extent of the release is currently unknown and undocumented in both the vertical and horizontal extent It is unclear at this time if the site poses a threat to local water supplies 4.0 PLANNED FUTURE WORK The next planned operation for this site will include additional Quarterly Status Report (QSR) and quarterly monitoring report (QMR) for the period ending June 30, 2003 The site will be resurveyed during the next quarter and the horizontal coordinates tied to California State Plane Coordinate System Each well head will be surveyed by use of a Trimble 5700 global positioning system (GPS) instrument and base station and tied to the local state plane coordinate zone The latitude and longitude of each well head will also be determined to an accuracy of ±0 1 foot horizontal The casing elevation of each wellhead will be surveyed by GPS with confirmation by optical Monitoring well casing elevations will be tied to the local vertical datum Coordinate information and analytical data will be placed within the Geotracker system in accordance with program directives All past data collected will also be placed in the Geotracker system A sequence of Tasks to be accomplished for the was presented in a Quarterly Status Report for the I" Quarter of 2003 to PHSEHD (Muir, 2003) These tasks will be included as an Expanded Site Assessment and Interim Remedial Action Workplan that will be prepared if PHSEHD agrees with the Scope of Work Once PHSEHD approves the workplan it will be submitted to the State Water Resource Control Board- Division of Financial Assistance (SWRCB-DFA) for pre- approval Once pre-approval has be granted by the SWRCB-DFA work will be initiated within thirty (30) days Matn\D�Environmental\ParmarTexaco\Reports\041403QMR wpd 6