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419 Main St.,Manteca <br /> Boyett Petroleum <br /> I <br /> Page 2 <br /> bgs. Therefore,all the existing monitoring wells are currently below the groundwater <br /> table. Nonetheless,PHS/EHD does agree that the proposed "deep" well should be <br /> constructed to a total depth of 50 feet with a ten foot screen length. <br /> • Any interpretation of geological data and preparation of geologic logs must be reviewed <br /> by a Registered Geologist,Professional Engineer, or Certified Hydrogeologist. <br /> California Code of Regulation,Title 23, Section 2649 (b) (D) states: "Geo(ogic logs shall he <br /> prepared by professional gedogist or cull engineer, ubo is roistered or certiW by the State of <br /> California... geologic logs may also be prepared by a teo rnimn trained and ocpmenxed in the use of the <br /> Unifred Soil Classifuation S)stem ubo is umking under the direct szcperusion oforr of the <br /> afarmvrwrxdd professio rats,prozided that the profiasional r?Ue` s the logs and assunrs responsibility for <br /> floe acaffacy and conpleteness of the logs." Such a professional did not review the conclusion <br /> presented in this letter. For clarification, a recent letter from the California State Board <br /> for Geologists and Geophysicists and the California Office of Environmental Health <br /> Hazard Assessment is attached. The letter describes what activities may be considered <br /> the "practice of geology" and may not be conducted by Registered Environmental <br /> Assessors unless they are also Registered Geologists. ! <br /> • In a letter dated November 27, 2000,PHS/EHD directed the installation of four <br /> shallow monitoring wells'to investigate the lateral extent of the contamination.and a <br /> deep monitoring well that will determine the vertical extent of the contamination in 1 <br /> ground water by December 25, 2000. Four monitoring wells were installed in December <br /> 2000, but the deep monitoring well has not been installed to date. The vertical extent of <br /> the contamination has not been defined. Install the deep monitoring well that will define <br /> the vertical extent of the contamination by April 25, 2001. <br /> If you have any questions,please contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran,REHS, Director <br /> Enviro ntal Health Division <br /> Jeffrey Wong, REHS Dot Lofstrom,R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> C: RWQCB, Central Valley Region-Marty Hartzell <br /> C WHF,Inc.- Bill Fox <br />