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• 0 <br /> Mr. James L.L. Barton, P.G. 2 April 15, 2008 <br /> Construction of this vapor-monitoring well will follow the general procedures described in Section 5.2 of <br /> the Pilot Test Work Plan. The wellhead will be fitted with a sample port for vapor monitoring with field <br /> instruments. <br /> Response to Comment (4) on Pilot Test Implementation Schedule <br /> The field pilot test is tentatively scheduled for the first to second weeks of June 2008. The key activities <br /> are well construction, baseline groundwater sampling, biosparge radius of influence (ROI) test (step <br /> and constant rate test), and post biosparge oxygen uptake (respiration) test. Since the biosparge ROI <br /> test system will occupy a portion of the facility property for up to several hours at a time during each <br /> test, Shaw may perform the ROI test during non-business hours, such as during the weekends. The <br /> oxygen uptake monitoring may require the full second week but will only be conducted periodically, as <br /> described in Section 4.2.1.3 of the Pilot Test Work Plan. Shaw will coordinate with the facility <br /> owner/operator on the use of the site property during the pilot test. <br /> Response to Comment (5) on Meeting Attendance <br /> At this time, Shaw and Don Rodgers are available on July 14, 2008 at 10:00 a.m. to attend a meeting at <br /> your office to discuss the biosparging pilot study results and to set the Final Remediation Plan <br /> schedule. <br /> We trust that these responses will address your comments and concerns about the Biosparge Pilot <br /> Test Work Plan. If you have any further questions or concerns, please do not hesitate to contact <br /> Charlie So at (925) 288-2345 or me at (916) 565-4358. <br /> Sincerely, <br /> Shaw Environmental, Inc. <br /> Charles Metzinger <br /> Project Manager <br /> Enclosures: Figure 4A <br /> Figure 5A <br /> cc: Mr. Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Charlie So, P.E., Shaw Environmental Inc., Concord <br /> Mr. Don Rodgers <br /> 1326 NORTH MARKET BLVD., SACRAMENTO, CA 95834 • 916.565.4358 • FAX 916.565.4356 <br />