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� �t <br /> Unocal #0123 page 2 <br /> 1034 S. Central Ave., Tracy. <br /> This site is required to continue in its investigative efforts and determine the <br /> lateral and vertical limits of the contamination from the underground tanks. <br /> A work plan that addresses the above noted concerns should be submitted to <br /> PHS-EHD for review. A receptor survey for all wells, conduits, utilities, and <br /> underground potential preferential pathways should be completed for this site. <br /> Groundwater monitoring should continue bn a quarterly basis and should <br /> include EPA Methods 8015m, 8020, and 8260 for every well, every quarter. <br /> Continue to sample for solvents, oil and grease, and metals in the groundwater <br /> until PHS-EHD has determined that a zero line has been established. This data <br /> should help your consultant determine where and how many additional wells and <br /> borings may be needed. <br /> Recommendations and conclusions must be included in each and every <br /> Quarterly Monitoring Report and the current site status and future plans <br /> should be discussed by the registered professional you have hired to <br /> manage the site. <br /> PHS-EHD will expect a discussion of these concerns in the next monitoring <br /> report. Without this inclusion in the next report, you may expect a directive that <br /> will require a work plan submittal within ninety (90) days of the report submittal <br /> date. <br /> I hope this clarifies PHS-EHD's evaluation of this site. Please direct any <br /> questions you may have to Michael Infurna at (209) 468-3454. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Z� <br /> Michael J. Infuma Jr., Senior REHS Margare Lagorio, RENS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: Wells Fargo Bank - A. Barbour, 111 Sutter St., 22nd Fir, S.F., 94163 <br /> c: Pacific Envir. Grp. - J. Muzzio, 2025 Gateway PI., #440, San Jose, 95110 <br /> c: CVRWQCS - Pat Anderson <br />