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Mr. Andrew Smith - 2 - • 16 July 2003 <br /> ASTs, but the Work Plan does not propose any borings in between these two locations. <br /> H&H Marina needs to propose additional sampling in these areas to further define the <br /> extent of pollution and determine whether the concentrations are related to the ASTs. <br /> 4. The Work Plan proposes three of the borings to a depth of 16 feet below ground surface <br /> (bgs) and one boring to the vertical extent of pollution as determined by the organic vapor <br /> meter reading. H&H Marina needs to discuss which boring is proposed for the vertical <br /> delineation and the justification for proposing samples to only 16 feet bgs when <br /> concentrations of constituents of concern were detected in MW-6 samples down to 55 <br /> feet bgs. <br /> 5. The Work Plan proposes to submit soil samples for laboratory analysis, but does not <br /> discuss how many soil samples from each boring will be tested or how the field geologist <br /> will determine which soil samples to submit for analysis. H&H Marina must include this <br /> information. <br /> 6. The Work Plan does not include a time schedule to complete the proposed activities. <br /> H&H Marina needs to include a schedule to complete the field activities and submit an <br /> investigation report that details the results of the activities performed. <br /> 7. H&H Marina needs to revise Appendix A to either include the tables referenced in the <br /> text or to reference which report contains the listed tables. <br /> By 15 August 2003, please submit a revised work plan that addresses the above comments. <br /> H&H Marina needs to consider monthly groundwater level measurements for all site monitoring <br /> wells to better define the seasonal groundwater flow directions. As stated in Regional Board <br /> staff's 8 May 2003 letter, a work plan for an interim remedial action is due by 25 July 2003. If <br /> you have any questions, you may contact me at (916) 255-3119 or by email at <br /> lewisd a,rb5s.swrcb.ca.¢ov'.�, n <br /> DEVRA LEWIS <br /> Environmental Scientist <br /> cc: Mr. James Barton, UST Unit, Regional Water Quality Control Board, Sacramento <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Daniel Kalmbach, Advanced GeoEnvironmental, Inc., Stockton <br />