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SAMPLING RESULTS Laboratory analyses of the water samples indicate that no release of fuel from the 5300 barrel No. 6 fuel tank has reached the groundwater in the vicinity of the tank. See the attached lab results, Appendix E. SAMPLING PLAN To detect any possible leakage from the 5300 barrel No. 6 fuel tank, the following sampling plan is proposed. This plan will be implemented for as long as deemed necessary by the RWQCB and the SJLHD. On a quarterly (every 3 months)basis,water samples will be taken from the 3 peizometers. Sampling will proceed as outlined below. Water level measurements will be taken from each well utilizing a Solonist water sounding device and recorded. A minimum of three (3) well volumes of water will be removed from each well. Water will be removed using a Isco bladder pump and air compressor. Electric conductivity, pH, and temperature will be measured as the well is purged. Water samples will not be taken until electric conductivity, temperature, and pH have stabilized. The Isco bladder pump will be decontaminated between each well by running a solution of Alconox and water or Liquinox and water through the pump and then running deionized water through the pump. All purged groundwater and all water used for decontamination purposes will be stored onsite,pending laboratory analyses. Water samples will then be taken with the bladder pump or with a decontaminated stainless steel bailer. Water samples will be placed into one (1) liter amber bottles, labeled, logged on a chain- of-custody/sample management form,placed in an ice chest on ice, and cooled to 4 degrees celsius. The samples will then be taken to EMC EPA certified analytical laboratory for analyses. Samples will be analyzed for TPH. A copyy of the lab results will be sent to the appropriate regulatory agencies (SJLHD and RWQCB). Any evidence of leakage will be reported immediately to the approppriate regulatory agency as outlined in California Admimstrative Code Title 23, Chapter 3, subchapter 16,Article 4, section 2641, "Unauthorized Releases Requiring Recording". COURTYARD TANKS AND SUMP AEMC in conjunction with Gold Bond Building Products Inc. has determined that the best and most cost effective alternative method for monitoring the courtyard tanks and sump is to abandon the original tanks in place and replace them with a smaller bermed above- ground storage tank. The courtyard tanks will be triple rinsed to remove all sludge that may have accumulated in them. Soil samples will then be taken under the fuel tanks and under the sump. Upon approval of the SJLHD, the tanks will be filled with cement grout. We are also proposing that the pipeline between the No. 6 fuel tank and the courtyard tanks be closed in place, and replaced with an above-ground pipeline. Soil samples will be taken under the pipeline at regular intervals to determine if leakage has occurred.