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o <br /> ENVIRONMtv <br /> SI"N <br /> ENTAL TECHNOLOGIES CORRORATION / . <br /> July 15, 1996 <br /> 94-337 <br /> i <br /> i <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 , <br /> -Stockton; Cali-forniA--.95281= 388- <br /> Subject: Well Destruction Report, Manteca Unified School District, 2901 Fast Louise f <br /> Avenue, Lathrop, California <br /> Ms. Meays: <br /> i <br /> On behalf of the Manteca Unified School District, Smith Environmental Technologies <br /> Corporation`is submitting.,this'letter`report which summarizes well destruction activities at the <br /> ;subject site:;I Prior+to,field`activities,'well lestnichonF permits' w`ere'obtained'from :the San <br /> Joaquin County Publie =Health`"Services i Environmental' Health t Division. All work was <br /> performed in accordance with California Well Standards Bulletin 74=90. - <br /> On July 2, 1996, Smith Environmental supervised the destruction of site monitoring wells <br /> MW1, MW2 and MW3 by a C57 licensed drilling company using pressure grouting <br /> methodologies. The wells were abandoned by filling the well casing and filter pack with a,neat i <br /> cement grout utilizing a pressure grouting tool., After the grout level.in the well casing had <br /> stabilized, the well casing for each well was drilled out to two feet below ground surface (bgs), <br /> - -- and'well°casing-*agmeots-.and debris were-removed.from"the boring. The boring was then filled ! <br /> with "lamp black" dyed concrete to the groundsurface to restore the site to its original <br /> appearance. <br /> Additionally, attached to this-letter is a.copy of the calculations for the mass'of residual petroleum <br /> hydrocarbon constituents in soil on-site. The calculations for the volume of residual contaminated <br /> soil were included in Smith_Environmental's "Closure Request Report" dated May 6, 1996.. The <br /> volume of contaminated soil was estimated to be 217.81 cubic.yards; and'this volume.was used to <br /> calculate the'mass`of residual:`petroleun'-hydiocarbons in soil. Based'on hl'storical analytical data <br /> itis estimated :that 179.51"' of petroleum hydr"ocarhons-'remain iii soil'beneath thesite. <br /> Calculations dre•'shown in=Attachment <br /> W.\94337\WELLABND.DOC <br /> 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 4 <br /> Engineering Consulting Remediation Construction <br /> ! <br /> 1 <br />