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PUBLIC ?1EALTH SERACES <br /> SAN JOAQUIN COUNTY ` <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D., M.P.H., Health Officer .. ; 'P.. <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 95202 %Foams <br /> 209/468-3420 FILE C <br /> HANSON FAMILY PARTNERSHIP <br /> 1342 LINCOLN BLVD MX 07 10 <br /> TRACY CA 95376 <br /> RE: Hanson Farm Underground Storage Tank SITE CODE: 506227 <br /> 7750 Schulte Rd. <br /> Tracy, CA., 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) has <br /> reviewed the June 15, 1998"Workplan for Subsurface Soil Assessment" submitted by Aqua <br /> Science Engineers Inc. on June 17, 1998 and has the following comments. <br /> In order to approve the workplan and issue the boring permit, the following requirements will need <br /> to be included in the scope of work. <br /> Soil samples are to be collected and analyzed starting from 8 feet below ground surface (' bgs) <br /> and continuing to the capillary fringe in five foot increments. At least two consecutive five foot <br /> non-detect soil samples are required to verify and confirm all vertical delineation conclusions. <br /> A groundwater sample is to be collected from the shallow aquifer beneath the former farm <br /> underground storage tank to verify that the groundwater has not been impacted. The <br /> groundwater sample is to be analyzed for the five oxygenates by EPA Method 8260 as noted in <br /> the enclosed policy, as well as the other methods listed in the workplan. Additionally, a PHS-EHD <br /> field selected soil sample and the groundwater sample are to be analyzed for Methanol and <br /> Ethanol by EPA Method 8015m direct injection. <br /> Grouting of the bore holes into groundwater can be accomplished by either tremie pumping <br /> cement grout from the bottom up or by adding NSF approved bentonite chips or pellets to the <br /> groundwater in the hole. Cement grout can then be poured from the surface to 20' maximum <br /> depth in a"dry" hole. If the depth to the fully hydrated bentonite is greater than 20', the grout is to <br /> be pumped in through a tremie pipe from the bottom up. In undeveloped areas, the surface to 3 <br /> feet below grade may be backfilled with native material. <br /> With the above noted items included in the proposed scope of work, the plan is approved and the <br /> permit can be issued upon your verification of the additional requirements. Please contact <br /> Michael Infurna, Senior REHS, at(209)468-3454 to verify the workplan modifications and to <br /> schedule the field work. <br /> Donna Heran, REHS, Director <br /> Envir me al He It ivi ion <br /> Michael J. Infurna Jr., Senior REHS Margaret agorio, REHS UU <br /> LOP/ Site Mitigation Unit IV Supervisor <br /> MI/ <br /> enclosure (to"cc" also) <br /> cc: ASE - Robert E. Kitay, R.G., 2411 Old Crow Cyn Rd., #4, San Ramon, 94583 <br /> A Division of San Joaquin County Health Care Services <br />