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4.i <br />t /1_1� 0 <br />groundwater resources inc. <br />wiv <br />April 18, 1989 <br />Mr. Jaime Favilla <br />San Joaquin County <br />Local Health District <br />P.O. Box 2009 <br />Stockton, California 95201 <br />Dear Mr. Favilla, <br />5610 DISTRICT BLVD., SUITE 106 <br />BAKERSFIELD, CALIFORNIA 93313 <br />General Engineering Contractor <br />Class A License No. 520768 <br />RE: Failed Precision Tank Test <br />on the 3,000 Gallon Back-up <br />Generator D' el Fuel Tank <br />Located at enter <br />St, Mantes , March <br />13, 1989 <br />The following is in response to your request for supplementary <br />information about our work plan dated March 17, 1989. <br />Groundwater Resources Inc. (GRI) has been contracted by CONTEL to <br />perform the tank testing, necessary soil sampling and analysis, <br />and reporting of lab results. While uncovering the piping for <br />testing, soil samples will be collected from two feet below <br />elbows and unions or any pipe connection suspected of leaking <br />because of odor, wetness, or staining. Samples will also be <br />collected to confirm that there has been no leaking in the event <br />no field evidence of leaking is observed. Subsequently, samples <br />which appear clean will be discarded if the line pressure <br />testing indicates no leaks. Only samples with odor, wetness, or <br />staining will be analyzed if the lines pass the tightness test. <br />Guidelines in the LUFT Manual, May, 1988, page 13, item 6, C, 1; <br />page 16, item 6, D, 1; and Appendix page 60 will be followed. <br />B.C. LaboratoriesInc., at 4100 Pierce Road, Bakersfield, <br />California, (805) 327-4911, will do the analyses. Analytical <br />procedures are to be EPA 8020 for BTX&E (diesel) and the <br />Recommended DHS Analytical Method for TPH, page 66 through 72 of <br />the LUFT Manual. Sampling will be done by qualified GRI <br />personnel under my supervision. <br />MAILING ADDRESS: P.O. BOX 9383, BAKERSFIELD, CA 93389 (805) 835-7700 <br />OTHER LOCATIONS: LOS ANGELES (213) 724-3147 PLACENTIA (714) 528-2415 <br />