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PUBLIC HEALTH SERN�ES ,§ <br /> SAN JOAQUIN COUNTY Z: a <br /> X <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> �: s <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 9520L-0388 %F6a`'�' <br /> (209) 468-3420 <br /> GORDON MARTS �. <br /> CALTRANS <br /> PO BOX 2048 MAR. 21 1995 <br /> STOCKTON CA 95201 <br /> Re: Stockton Maintenance Station Site Code: 10193 <br /> 1604 South "B" Street <br /> Stockton CA 95205 <br /> San Joaquin County Public Health Service, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Site Assessment Workplan" dated March 15, 1995 and has prepared the following <br /> comments for your consideration. <br /> The work plan proposed the installation of six monitoring wells to investigate the extent of groundwater <br /> contamination. One of these monitoring wells, MW9, is to be installed in an area of suspected soil <br /> contamination, thus further investigating the vertical extent of the soil contamination. <br /> PHS/EHD concurs that additional investigation of the extent of soil and groundwater contamination is <br /> necessary; however, PHS/EHD questions some aspects of the work plan. The necessity of installing <br /> four inch diameter monitoring wells instead of two inch diameter monitoring wells should be explained. <br /> Also, the number of perimeter wells proposed should be justified. Finally, the proposed monitoring <br /> well, MW9, was specified to be constructed with approximately 60 feet of screened casing. For the <br /> purpose of groundwater monitoring, the maximum amount of screened interval which is allowed is 20 <br /> feet. A twenty foot screened interval is considered to have sufficient screened casing to accommodate <br /> changes in the static groundwater level without unduly diluting the samples collected. If this well is to <br /> be used for vapor extraction testing, screening should not extend below the static groundwater level. <br /> PHS/EHD requests that an explanation of MW9's construction and purpose be provided. <br /> Once PHS/EHD has evaluated and approved the additional information and any modifications <br /> proposed, PHS/EHD will issue a drilling permit. Please be informed that PHS/EHD should be notified <br /> 48 hours in advance of any field activities. If you have any question or comments, please contact me <br /> at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, SeniorEHS Diane . Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM/16046/D <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Gary Winters, Caltrans Sacramento <br /> cc: Saiyed Ali, Caltrans Stockton <br /> cc: Office of the State Architect <br /> A Division of San Joaquin County Health Care Services <br />