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•CAMBRIA <br /> Methyl tertiary butyl ether concentrations in two of the three wells this quarter are slightly <br /> higher but are generally consistent with historical data Tertiary butyl alcohol and tertiary <br /> amyl methyl ether were also detected in all three wells, at concentrations ranging from 12 to <br /> 600 parts per billion (ppb) and 0 64 to 49 ppb, respectively No lead scavengers were <br /> detected <br /> Cambria recommends continued quarterly monitoring and sampling to establish the <br /> predominant groundwater flow direction beneath the site and to monitor the oxygenate <br /> concentrations in groundwater As proposed in our July 3, 2000 Response Letter/Site <br /> Investigation Work Plan, Cambria also recommends assessing the vertical and lateral extent <br /> of petroleum hydrocarbons and oxygenates by drilling onsi ee done penetration _ oring <br /> Cambria is prepared to implement this work plan upon receiving approval frorn�) <br /> SJCPHS/EHD <br /> CLOSING <br /> If you have any questions regarding the contents of this document, please call Aubrey Cool at <br /> (707) 933-2368 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> 04� <br /> Cynthia Vasko <br /> Staff EngineerD1GEQ�O <br /> Joe W Neely, RG <br /> Senior Project Geologist No 6927 <br /> RG 6927 <br /> •9 <br /> Attachments SOF CgL1C� <br /> Table 1 Additional Groundwater Analytical Data <br /> Figure 1 Site Vicinity Map <br /> Figure 2 Groundwater Contour/Chemical Concentration Map <br /> Appendix A Blaine Tech Services, Inc — Groundwater Monitoring Report <br /> cc Ms Karen Petryna, Equiva Services LLC <br /> Mr Marty Hartzell, Central Valley Regional Water Quality Control Board <br /> 0955 2 <br />