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rburr BRUWN & CRLDWELL P HILL 510 934 9026 P.02 <br /> 23, 1993 <br /> 1r. A ichwi CWUM <br /> Rid Fnviro mimId Hes A Spamfist <br /> &m kullsin Can"Public I3dwltit S wises <br /> 40 N. Seas Y wp& Street <br /> Swim, CA 95 1 2004 17-70"111 <br /> subjub Korn(M ROMA"best <br /> hsfmlaW Resuft of Emvadon SOMI aid <br /> Aq ailment to Work Pian for Backfiillag of bxcavelon <br /> Door kir. Collins: <br /> Pumnant to the San Joaquin Cmay's (County)request far oonf rmsim of the quality of the. <br /> sell In tlm vktdnhy of the eamvamn #t the suhjwt facility, Brown and Caldwell (BC) was <br /> audwnzod by Sbeldaa Oil Company (Sheldon) to col act 10 sail samples from the a&-walls <br /> and bottom of the accavadon op September 30, 1993_ SMpW were collected under your <br /> mgxrvislpa, at kmmdm approved by you, and weve submitted to Western EnvitnnnumW <br /> Scia M aid 'Fogy MM) Laboratory in Dwns, California, for analysis of total <br /> pdmWm hydrocarbons as diesel (MW) aril motor oil (TPHmo) following the toxity <br /> ehara a. . le t$procedum(T Ci P)Bernd in <br /> Edition. Analyticallahoramy <br /> dear tfut we meted in Attachment A and summarized m Table 1. In beef, TPHd and <br /> TPEmo were not kkutified at at above the analytical method mpN ing limit in any of the telt <br /> 22 Beed an these rem Sheldon would lilac to begin backfilling the aww adon as <br /> soon as posaale. <br /> In the Somber 3. 1993 EC Own wu <br /> a mommeodation to Flacee approximately 2#cit of armmp AW clay material in the bare of the <br /> OAM11On to act = a liner. Hw*-n C, since that necommendatian was presented to the <br /> Comy,Kidnfelder Geotechnical C.oasultants(Kkmfdder),the geotechnic l engineering firm <br /> ngx''ble for the de dp and Certification of tier backfilling of the excavatkm, has <br /> t�ecrommanded that a day liner not be used. They te=nmend that multiple laym of 6 or <br /> 10 mH visqueen with ptoW ming and caulked seams be considered.' Micinidder sites <br /> cunaerns rcgmr na the sa*operation of equipment and the pbcmn mt of men in the Mase of <br /> the moa as titan reasons for rroaornmending go use of visqueern over clay as a liner. <br /> In lieu of this mcommaadatien, BC requests that the baeMling pmceduree be amended to <br /> Include a visgwen liner In place of a clay liner. KWnfelder also recanimends the placement <br />