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PUBLIC HEALTH SERVICES �a �o <br /> SAN JOAQUIN COUNTY 2 <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 95202 <br /> 209/468-3420 <br /> HANSON FAMILY PARTNERSHIP _ <br /> 1342 LINCOLN BLVD &X 0 7 08 <br /> TRACY CA 95376 <br /> RE: Hanson Farm Underground Storage Tank SITE CODE: 505227 <br /> 7750 Schulte Rd. <br /> Tracy, CA., 95376 <br /> San Joaquin County Puclic Health Services, Envlronmertai 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 bor'ng perm t. the following requ rements will need <br /> to be included it the scope of work. <br /> Soil samples are to oe collected and analyzed s:a-ting from 8 feet below ground surface(' bgs) <br /> and continuing to the capillary fringe in five foot incremerts. At least two consecutive five foot <br /> ron-detect soil samples are required to verfy and confirm all vertical delineation conclusions. <br /> A groundwater sample is*o be collected from the shallow aquifer beneath the former farm <br /> underground storage tank to verify that the groundwater has not beer 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 grourdwater 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 pcmping <br /> cement grout from the oottom up or by adding NSF approved bentonite chips or pellets to the <br /> groundwater in the hole. Cement grout can their be poured from the surface to 2C' maximu.m <br /> depth it a 'dry" hole. If the dep,h to the fully hydrated bertonite 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 ma;erlal. <br /> With the above noted Mems included in the proposed scope of work the plan is approved and 'he <br /> permit can be issued upon your ver'fication 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. D.rector <br /> En�me al He Itf vi ion <br /> Michael J Infurna Jr Senior REHS Margaret 1 aconic REHS <br /> LOP/Site Mitigation Unit IV Supe-vso� <br /> MI/ <br /> enclosure (to"cc"also) <br /> cc: ASE -Robert E. Kitay; R.G., 2411 Old Crow Cyn Rd..#4, San Ramon. 4583 <br /> A Division of Sar,Joaquin Ccunp•Health Care Services <br />