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1 EKM. • Mr James L Barton July 27, 2005 Page 10 For the remaining wells, it is recommended that the specific constituents showing concentrations above the screening levels be monitored until the concentration has been below Ithe screening level for four consecutive monitoring events, as follows • MW-1 TPHg, Benzene • MW-2 TPHg, Benzene, Naphthalene, 1,2,4-Trimethylbenzene • MW-3 TPHg, Benzene, Naphthalene • MW4 TPHg, Benzene • MW-6 TPHg, Benzene • MW-8D TPHg, Benzene ' + MW-9R TPHg • MW-11 TPHg, Benzene, Naphthalene (Naphthalene exceeded the screening level to July 2004 and was below for the following three monitoring events) MWA 2 TPHg (exceeded screening level in July 2004, but not detected in the following three monitoring events) 10 • MW-14 TPHg (exceeded screening level in July 2004, but not detected in the following three monitoring events) o MW-16 TPHg, Benzene o MW-18D TPHg (exceeded screening level in duly 2004, but not detected in the following three monitoring events) 0 MW-24S TPHg (exceeded screening level in July 2004, but not detected in the following three monitoring events) O MW-24D TPHg, Benzene i • MW-25D TPHg ENSR will submit a separate letter formally requesting the above-listed reductions in sampling Additionally, ENSR will continue with the current sampling protocol pursuant to CAO No 5-00-707 pending any changes deemed acceptable by the RWQCB Future Work ENSR will continue to optimize the remediation systems in order to limit downtime and increase mass removal To that end, ENSR intends to plumb new air sparge well AS-33 and monitoring well MW-23S into the existing air sparge conveyance line The field work is expected to be reported in the third quarter 2005 quarterly monitoring report Celebrating 35 Years of Excellence in Environmental Services t