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+ r <br /> CA BRA <br /> • <br /> Since there is strong evidence that the MTBE detected in Shell's wells is from an offsite <br /> source, Cambria now recommends reducing the number of wells sampled at this site and <br /> reducing the sampling frequency at this site Cambria recommends performing monitoring <br /> and sampling in wells MW-1, MW-2, and MW-5 twice a year (during the second and fourth <br /> quarters) and discontinuing monitoring and sampling in all other site wells These three wells <br /> have consistently contained MTBE and are positioned well for creating groundwater contours <br /> to monitor groundwater flow direction and gradient We plan to implement this sampling <br /> schedule change begin the third quarter of 2000 unless we hear otherwise from SJCPHS <br /> If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707) 933-2361 <br /> Sincerely, <br /> Cam ria Environmental Technology, Inc <br /> Lisa Summers <br /> Staff Scientist <br /> Q,ED G6G� <br /> �f� 0 <br /> Jo Neely, RG { <br /> Senior Project Geologist No 6927 0 <br /> RG 6927 <br /> ��oF CALI��\7- <br /> Attachments <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 /> Ms Kama E Harrigfeld, Herum, Crabtree, ct al (counsel for property owner) <br /> Mr John Weber, C M Weber Enterprises Inc (property owner) <br /> City of Stockton Redevelopment Agency (property owner) <br /> 0821 3 <br />