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yY <br />I <br />T <br />Laura Andrew <br />2651 S. Airport Way <br />Page 2 of 2 <br />Y <br />Stockton, California <br />Collection of groundwater samples from B-1 and B-6 at greater depths than the proposed <br />60, 70, and 80 feet bgs, considering historical data indicate that groundwater_ is already <br />impacted at 80 bgs; <br />Collection of a groundwater sample from borehole B-3 in the intervals sampled in B-1 and <br />B-6 to assess contamination down gradient of the source and allow for contouring future <br />groundwater data; <br />Collection of groundwater samples from every well (including piezometers, monitoring, <br />and air-sparging wells) during the next groundwater monitoring event; then propose the <br />wells to monitor quarterly, semi-annually, or annually, based on this and historical data. <br />Please respond to EHD's recommendations by May 20, 2004. If you have any questions regarding <br />this letter please contact Vicki McCartney at (209) 468-3456 or by e-mail at <br />vinccartne.y@sjcebd.com. <br />Donna Heran, REHS, Director <br />Environmental Health Department <br />U�'117e &t <br />Vicki McCartney, REHS, <br />Unit IV -Site Mitigation <br />Nuel C. Henderson, Jr., RG <br />Unit IV- Site Mitigation. <br />cc: James L.L. Barton — CVRWQCB <br />Mark Milward — Philip Environmental Services Corporation <br />Eric Findlay — Kleinfelder <br />