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419 Main Street <br /> Boyett Petroleum,Page 2 <br /> 2) Condor and EHD agreed that installation of the shallow groundwater wells proposed in the <br /> report should be preceded by advancement of cone penetrometer testing(CPT) to at least <br /> 75 feet bsg to properly design the additional monitoring wells. Multi-chambered monitoring <br /> wells may be the technology of choice to define the vertical as well as lateral extent of the <br /> contamination on and off site. Submit a work plan to EHD to define the vertical and lateral <br /> extent of the contamination plume,including the use of CPT,by June 31,2003. <br /> 3) EHD agreed with Condor's recommendations to: <br /> • Conduct a door-to-door survey of the residential area to identify and locate private <br /> _ wells and to identify the source of any pumping influence as a supplement to the <br /> previously submitted 2000-foot sensitive receptor survey(Third Quarter2000QMR). <br /> EHD requests any well construction details found to be included.. If confidentiality <br /> - _ is a concern,EHD requests the information be submitted it in a separate <br /> confidential mailing. Conduct and submit,this survey to EHD by July 1,2003. <br /> • Redevelop MW-1,MW-2,MW-3,MW-6,MW-7,MW-8,and MW-9 to remove as <br /> much sediments as possible from the well casings. <br /> • Destroy both damaged and consistently dry wells MW-4 and MW-5 and replace <br /> MW-4 with anew monitoring well in.the same area.-It appears that MW-2 provides , <br /> adequate monitoring-south of impacted wells._ <br /> • Begin a monthly monitoring and sampling schedule over-the next 6 consecutive <br /> months to characterize the fluctuation of MTBE concentrations in the groundwater <br /> i samples. ` <br /> EHD recommends MW-1 design be reviewed in the context of a site conceptual model,and if <br /> MW-1 potentially creates a vertical conduit between different sand layers. Submit a work plan for <br /> well replacement if appropriate. <br /> If you have any questions,please contact Jeffrey Wong at(209) 468-0335. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> 1_4 Jeffrey Wong, Senior RENS Nuel C.Henderson,Jr.,RG % <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> C: RWQCB,Central Valley Region—James L.L.Barton,RG <br /> r C: Condor Earth Technology—Lee Morse/David Wood <br />