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Envbo"l <br /> r <br /> Geotechnical te, Construction <br /> Consulting• Engineering • Testing <br /> i <br /> June 14, 1996 <br /> Ms. Margaret Lagorio, Lead Senior REHS <br /> Site Mitigation Unit <br /> Public Health Services <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, California 95201-0388 <br /> RE: Suburban Propane Site Code: 505423 f <br /> 23901 S. Chrisman Road <br /> Tracy, CA 95376 <br /> PSI Project No. 582-6I003 f <br /> T � <br /> 889-6I117 <br /> Dear Ms. Lagorio: <br /> �It <br /> r <br /> This letter is written in response to your request (dated 11May 21, 1996) for additional <br /> documentation and additional site work at the above-referenced site. <br /> ! <br /> The manifest for the transport of the 500 gallon underground storage tank formerly <br /> located at the site and the certificate of destruction for this tank are attached. As indicated <br /> in the Underground Storage Tank Removal report (issued by PSI and dated January 5, <br /> 1995), the tank was empty when removed and no rinsate was generated. <br /> Suburban Propane has again hired PSI as the consultant for this project. To attain site <br /> closure, PSI proposes to destroy the three on-site monitoring wells through pressure- <br /> grouting. Gregg Drilling & Testing, Inc., Martinez, CA, will be subcontracted to perform <br /> this task. Cement/bentonite grout (Portland cement mixed with 5% bentonite) will be <br /> tremied into each well under pressure supplied by an air compressor fitted with a specially <br /> designed cap. This cap will force the grout into the surrounding formation while also <br /> filling the well casing. The wells will be pressure-grouted to within one foot of the ground <br /> surface. The remaining well casing will be cut out and the surface traffic boxes will be I <br /> removed with a jack hammer. The resultant space will be ;filled with concrete and leveled <br /> at ground surface. PSI understands that this activity is to occur under permit and <br /> inspection of the PHS/EHD. Attached please find the completed permit application and <br /> the $60 permit fee. <br /> Upon completion of the well destruction, PSI understands that a closure letter will be <br /> issued for this site. <br /> Infonwtion 7o Build On <br /> i <br /> PSI.2280 Bates Avenue,Suite D•Concord,CA 94520•Phone 510/685-2488•Fax 510/685-2991 <br />