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03'/"301`1998 1 :36 12098325152 WRIGHT CNVIRUNMENTAL Pi:Gc 10 x'03-20-1996 10:06W FROM' ILMER CEG TO 12e%-25152 r.ei Wright Environmental ENVIRONMENTAL HEALTH DIVISION Services,Inc. 304 E. Weber Ave. Third Floor P. O. Box 388, Stockton CA 95201-0388 March 20, 1998 Approved Denied ❑ MI Zafihu!la7XI Conditions 'c' Co�'17 S �,rLOltt C*of Tracy 520 Tracy$oubvard Date by 4 Tracy,CA 95376 Re: Workplan for Limited Eavimumsntal Site Investtlgatins, Bold Sst*vks Csntar Wrlgbt Proposal 4203-P Dear Mr.Zara, Wristrt Enviroaaua4 Sorvwm Inc.(Wng M)is pleased to provide you with this wodq?4m for the lkalted environmental in.ws66ation at the above hefiretxsd site. The pwposs of this work is to aaowWn the depd to groundwater,identify suspected petroleum Contaminsats in Boil gad yroandwater, and bat Manag=mat preaticaes should contamiaams exist in the proposed naw wxkrVVJW storngs tank Scope of Work Sot!- z Foto expio rwry borings will bs drilled at the locations shown on Figura 1. Drilling and well iasohdlatioa G646-w4r6P permits will be secured prior to doing the geld war One borehok will be converted to a grom+dwater DUR�N i PflIlLINO monitoring well. The txvmhoks will be ddM with t vCk mot nwil bodlowstam aullccr and/or direct push , drilling equipment. Ail drilling equipment and sampfirrg tools will be eimrod prior to arriving. and before leaving the site. The augers will bo advanced to ft desfrsd wrrpling depth interval.and a dors split spoon sampler will be driven ahoad of the drill bit. Ths sanpla wip that be rendered and dismInbied, and dee 5RVQeD, ,4NID soil shod brass liner will be saalod with Teflon®papa and placic cwkzs, labeled. bgpd onto chaia-of- 1' custody forma and plant in a chilled ice cbest. 'Itis botshoks will be k aad using the Uaifhad Soil Classification System ander dw superyision of a regisletad geologist using lbs onchcd Coosciaroe pmwols Wright has developed for drilling,sating,well eoruvualon and sampling. Additional lilisolotie T information will be collected to describe the substufaci geology. The samples will be ooi rials at five-foot intervals,at intervals of obvioas contamination and at$Uzdgrnpbk featum of interest. Upon compietion of the bombok drilling and colloction of information,rho boreholes not con vv to Monitoring walls will be backfilisd with gm"L placed from the bottoat to top of the boneitole. One monitoring well may be instaliod using the amwllted protocols as an option. The weil will be =ad With SCh.40 PVC casing.threaded togcdW; =lues will not be used. The slotted interval will be a 0.020 < inch slot mW the annular space around the slots will be backMW with a 2112 fess sand. Previous expai«roe has shvwe this to be a reliable well design in Ane psined and smod ed depositional snvirvnments. Feral well design will be modified to lbs site specific cooditions encounwull in the borehole during drilling. Oaee to aquifer strata has been de wwd,the cuing will be los^aed to the bo=m of the borchoic. leaving a slowed intoe v I above the occwm a of Voundwa/er w observe for floating prvdtacL The and pack will be placed to a point about two fest above rte slots. A beawt ite seal will be placed amp the sand pack.and a cement gran seal placed uwp die bentonits using a tramic line.filling from rise bottom to top of the borehole. A traffic rated wall head accass box arnl bmurity device will Cott+plate the weiL Mnnitorinr W1 Swripling sad Davekxzn at Tie monitoring well will be developed to muzove tors dnWag muck,grrde the sand pack and provide a mote complete hydraulic connection to the aquifer. A well development Io=will be kept of The well voluam 4220 Cantraoccial Dr.,Suitt:5 . Tracy,CA 95376 209.833.0758 • Fix 209.832.3132 Pa:e 1 ,.ri�hrrpjnvirac>V caw Lar-AW/591 4-Q tfajMer