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W�1pL�f Nv Ilai•i Wal lxaali.ae r rw tasuls a metlW waw <br /> rr+�tT=cry Nn.Wo#R19e1 6411 Wen aamn Sven led5 CWkm�a � <br /> New West site which showed s:gmffcantly hriha concentrations of methyl tethary,butyl ether <br /> (MT BF)than the Chevron onsite wet Is <br /> fu]y 15 2005-Apex submstted a workplan titled Workplan far Prelwrtnmy Site Assessment <br /> proposing the mstallmian of eight sail borings <br /> f my 15 2005-The STCEH issued a leiter to New West'equurng a workplan addendum to <br /> define the lateral and vedical extent of the peltoleatn phone conung fiam the site ublizmg <br /> momtonng wells <br /> Tuly 22 2005-Apex submitted a workplan trued Workplan for Pielnnrnmy Sne Assessment <br /> (Monrronng Wel1s)Addendum proposing four first zone wells and two second zone wells on and <br /> off we The STCEH accepted the workplan In a Eater dated f my 27 2005 <br /> August 1 3 and It 2U05 Apex personnel supervised the Installation of six groundwatct <br /> momtotmg wells(MW I MW 2 MW 3A MW 313 MW4A and MW413) MTBE was <br /> detected In$oli at wells MW 3A end M%3B and MTBE was detected in groundwater at wells <br /> MW 1 MW 3A,MW 3B and MW-413 Results are documented ra the aepoit Ground—net <br /> Monnoteng Well lmtallatrom Results Report dated Seplembe:22 2005 <br /> 0s-purml— <br /> l6 2005 The STCEH issued a letter requesting additional momtonng welts t6 definee lateral and sottical of the groundwate:plume and the installullon of an interim remediationystem(Appendix A) <br /> MONITORING WELL INSTALLATIONS <br /> Based on current soil and groundwater samples(tables I and 2 tespectively)Apex proposes to <br /> install four momtonng wells offsite(MW 5A MW 58 MW 6B and MW 6C) Offsite wells <br /> MW 5A and MW 5B will be Installed In the curb of Sla:Street north of Weir Barmer Street and _ <br /> wells MW 6B and MW-6C will be installed In the curb of Stat Street south of Capitol Road <br /> (Figwe 2) Depth to groundwater rs approximately 14 feet below ground surface(bgs)end all <br /> wells will be Installed using a hollow stem auger dill ng Ali wells will be constructed using <br /> Schedule 40 PVC and 0 D20 slotted schedule 40 PVC screen WcIl MW 5A wi II be installed <br /> within the first zone to a total depth of 25 fee!bgs and setccned from 5 to 25 feet bgs Wells <br /> 'AW 5B and MW 6B will be Installed m the seWhd zone to a total depth of50-feet bgs and <br /> smeenod fiom 4D to 5n feet bgs Welt MW 6C will be installed m the ozone or Rocky s upper <br /> zone to a total depth of 75 feet bis and scmcned fiam 70 to 75 feet bgs Total depth maybe <br /> modified pending subsmfacc conditions All wells annular space will be backfilked with a#3 <br /> Monterey sand pack from total depth to I foot above the screened interval followed by 2 feet of <br /> hydrated bentonite and Poritand cement to the surface The well casings will be protected with <br /> locking expansion caps and traffic rated vault hnxw <br />