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' Former Manna Pr SPage 5 a a oite � ' Quarterly Groundwater Monitoring Report Project No 207 2 . March 2, 2000 tgasoline Upon questioning, the lab chemist reported that essentially all of the gasoline range hydrocarbons in the sample were from a single "spike" This ' suggests that some type of contamination was present in the sample from a single chemical The lab was asked to recalculate the TPH level as if the spike were absent If the spike is excluded, the sample TPH level falls below MDL t limits for detection A photocopy of the chromatogram is attached in with the lab data sheets 2.3 Field Data The field data for this groundwater monitoring event are summarized in ' Appendix B and Table 1 The level of groundwater has risen approximately V2 foot since the last groundwater monitoring event completed in October of last year The bearing of groundwater flow as shown in Figure 3, is substantially different than prior maps prepared by other companies This is a result of the recent survey which was completed for all of the wells Generally, the direction ' of groundwater flow is to the north east, which is also consistent with the direction observed in the Cutter Lumber site, adjacent to the north Based on the field data obtained in this monitoring event, the overall groundwater gradient and bearing of flow as determined by a 3-point calculation from wells MWA MW-8 and MW-9 is 0 0014 ft/ft on a bearing of N66oE This ' compares with a gradient and bearing of 0 0032 ft/ft at N560E from the October 1999 monitoring event ' 2.4 Waste Disposal Purge water from the October monitoring event had been temporarily stored in 55 gallon drums on the site On January 14, 1999, American Valley Waste Oil, a ' licensed hazardous waste hauler collected and removed the purge water for recycling The manifest is attached as Appendix C rThe purge water which was temporarily stored in DOT approved drums on the site will be removed for recycling prior to the next monitoring by American ' Valley Waste Oil ' 2937 Veneman Ave,#B240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto, CA 95356 Fax (209) 569-0293 1