ARCHIVED REPORTS XR0007017 - Laserfiche WebLink

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�il ra Working To Restore Nature hydrocarbon constituents Monitoring well MW5 was reported to contain low to moderate levels of benzene, xylenes and TPHg Well MW6 was reported to contain 12 parts per billion toluene The approximate extent of dissolved contaminants (benzene) is shown on Figure 3 A general trend: of decreasing concentrations of dissolved contaminants in wells MW4 and MW5 has been noted over the past six consecutive quarters Laboratory reports with chain-of-custody documents are included in Attachment 2 RECOMMENDATIONS RESNA, on behalf of the responsible party, is prepared to implement the revised groundwater monitoring program which was approved in PHS/EHD correspondence dated August 4, 1993 Under this program, MW 1 and MW6 will be sampled quarterly, MW4 and MW5 will be sampled semi- annually, and MW2 and MW3 will be sampled once a year Quarterly reports will be submitted in accordance with appropriate regulations Based upon the observed trend of decreasing concentrations of dissolved contaminants over time, no active remediation appears to be warranted The status of natural degradation will be evaluated after the next sampling in March 1994 If you have any questions or comments regarding this protect, please contact John Lane at (209) 838- 3507 • Sincerely, RESNA Industries Inc J46 P Lane Project Geologist t� /reggory P Stahl CA Registered Geologist No 5023 Attachments Table 1 Groundwater Elevation Data Table 2 Laboratory Analysis - Water Figure 1 Site Location Map Figure 2 Groundwater Gradient Map Figure 3 Estimated Extent of Dissolved Contaminants (Benzene) Attachment 1 Groundwater Monitoring Data, Well Purge Logs Attachment 2 Laboratory Reports, Chain of Custody Documentation PC CRWQCB Yvonne Mabee Donald McShane OW036714QR-1993 FNL 2