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.R <br /> PUBLIC 5EALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer c4.. alp <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 �tt=oe <br /> (209) 468-3420 <br /> C (OPY <br /> TOM PORTELE <br /> GREYHOUND LINES INC <br /> P O BOX 660362 FEB 3 <br /> `� <br /> DALLAS TX 75266-0362 <br /> RE : Greyhound Terminal #8969 SITE CODE: 1041 <br /> 121 S . Center St . <br /> Stockton, CA 95201 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS-EHD) has reviewed the "Supplemental Site <br /> Assessment" submitted by Engineering-Science (ES) on November 28, <br /> 1994 and has the following comments . <br /> PHS-EHD agrees with the proposed investigation for the area west <br /> of the former dispenser and tank pit area. PHS-EHD recommends <br /> that additional soil investigation be added to this phase to <br /> include soil sampling at other areas where contamination <br /> currently exists . <br /> San Joaquin County Flood Control records indicate that <br /> groundwater was at 20 feet below ground surface ( 'bgs) in Spring, <br /> 1986 . This depth to water (DTW) is considered the "seasonal high <br /> groundwater" and as such, shall be the DTW used in the Leaching <br /> Potential of the LUFT Manual to determine if contaminated soils <br /> may be left in place unremediated. Any soils that contain <br /> detectable petroleum products at or deeper than 20' bgs shall be <br /> evaluated and this calculation submitted in the PAR (Problem <br /> Assessment Report) . <br /> Contaminated soils that fail the Leaching Potential shall be <br /> addressed in the Draft Remediation Plan/Corrective Action Plan. <br /> Based upon the site specific conditions, lateral and vertical <br /> extent of both soil and groundwater plumes, and economic <br /> considerations, two alternatives of remediation shall be <br /> submitted in a feasibility study to PHS-EHD. <br /> PHS-EHD is concerned that the "assumed" lateral extent of TPH-D <br /> and "a vertical extent of significant TPH-D" discussed in this <br /> recent submittal does not accurately represent site conditions . <br /> PHS-EHD recommends that adequate samples be collected and <br /> analyzed from the "assumed" and (less than) "significant" areas <br /> to adequately verify subsurface conditions so that a complete PAP. <br /> may be submitted. <br /> A Division of San Joaquin County Health Care Services <br />