Laserfiche WebLink
Ms. Katie Hower SECOND DRAFT <br /> Chevron Pipe Line Company <br /> 24 January 1997 <br /> Page 67- <br /> research has shown that removal of these interferences by a silica gel cleanup and/or lab <br /> filtering with a glass fiber(0.7µm) filter is required to assess dissolved petroleum in <br /> groundwater. Although both sources of interference are potentially present in both the <br /> purgeable and extractable TPH measurements, the conventional sample preparation for <br /> purgeable TPH analysis has not yet been modified to accommodate cleanup because of the <br /> potential for loss of volatiles. The p c QCB has been an ardente" of the siliea 1 <br /> `1 Y ..f bl TDL7 1 ..:,.. 1.oweyer, :t : ow nderst8...,1:_g thatt T)WQCB d___ _ <br /> EA <br /> ..e. eur with filtering samples due to eenee.. s abut serptieft. A a' A in <br /> Foote, 1 <br /> (1996) it rives net appear that , Y ,...t: : a problem..1 using 1 glass rher-filter; however, <br /> per the R3A'Q(;B's oufrent position on this issue, the extfaetable T-PI4 analyses will be eleafied <br /> up ,.:th sili t filtered.a gel, bi:A not The teehaieel issue a fi b will be a• a c. h <br /> with PWQGB in l:bt . f the Foote, 1 (1996), findings ,. 1 p1QGB' r-eviewF this <br /> issue, <br /> to fbiA samples will be Altedprior to ext.... 1. A 'F D'AIQGB <br /> ..e <br /> ebtained: <br /> As discussed earlier, due to the age of Old Valley Pipeline releases, sites affected by residual <br /> crude oil/Bunker C v 'keare asswned to have reached chemical equilibrium=-op4ead - <br /> state eenditionsThe lack of BTEX and PNAs in groundwater samples tends to indicatepEeN% <br /> that intrinsic biodegradation has been and continues to be active at these sites. Based on data <br /> from several Old Valley Pipeline sites. dDetections of TPH are expected to be relatively stable <br /> over the quarterly monitoring period. Calculations of biodegradation rates may not be <br /> applicable at these sites. the combination of the age of the petroleum. limited plume migration. <br /> and low concentrations will be used to demonstrate that mass is decrea ing and potential <br /> beneficial use of groundwater will be restored The TP14::,,.suFe..._::4 is not saffc,e.tl <br /> 'rYreeise <br />