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zOa'� Mr.'Mke Infurna <br /> Page 3 of 3 <br /> test (BST). Mr. Infurna has postponed review and comments of the September 2007 WP pending <br /> i approval of the BST protocol submitted to the Regional Water Quality Control Board on September <br />` 27, 2007. <br /> i <br /> GZA recommends reducing the sampling frequency of WCW-R,IW-3 from a quarterly to a semi- <br /> annual regime .0 qu_arTe_rs3 and,re uc[ng the samp ing equency o f t he remaining wells <br /> from a quarterly to an annual regime(2 quarter). l <br />} o WCW-MW-I and WCW-MW-2 have been below detection limits far all analyzed " <br /> constituents for eight years, No constituent has ever been detected in these wells. <br /> o WCW-MW-4 has been below detection limits for all analyzed constituents for nearly five <br /> years. In November 2002 MtBE (19 ppb) was detected, ane constituent detected once in <br /> more than five years. j <br /> o WCW-MW-5 has been below detection limits for all analyzed constituents for more than five <br /> years. No constituent has ever been detected in this well.ii. <br /> o The plume is clearly defined and limited to the area of WCW-MW-3. <br /> o TPHg, TPHd, and MtBE concentration_s have been relatively stable in WCW-MW-3 over the <br /> j the last twelve sampling events. <br /> o The second quarter was selected because MtBE concentrations tend to be higher during the <br /> t 21d quarter monitoring and sampling events., : v <br /> The next round-of groundwater sampling is scheduled for February 2008. EHD will be provided with at <br />`i least 48 hours notice prior to conducting fieldwork. <br /> y w <br /> If you have any questions or comments please contact Ground Zero at your convenience. <br /> Respectfully, <br /> Ground Zero Analysis,Inc. - <br /> a <br /> Joseph L.'Vasquez, a <br /> Staff Geologist - ONAL G <br /> ERIC LEE PFUCE <br /> Eric L.Price, R.E.A. I No. 8242 � <br /> Professional Geologist No. 8414 ' W$414 <br /> Attachments <br /> cc: Mr.Nathan Crum, Valley Pacific Petroleum Services, Inc. <br /> Ms. Karen Collins,Environmental Closures,"Inc. <br /> Mr. James L.L. Barton,RWQCB <br /> �y G:\GROL^4[JZCVIVOOLSGY.C[111R rts\ N.R1200 M2007doc <br /> � Q �Q <br /> 1 <br />