SITE INFORMATION AND CORRESPONDENCE_2001-CURRENT

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f r • Mr. James L. Barton February 12, 2008 Page 2 the application. The Design Plans are based on the 1997 UBC, 2005 NEC, and the 1997 UFC, where applicable, and expected to comply with the City of Stockton building codes. Additional Comment No. 2 The Addendum states the specified operational pressure for the air compressor for the AS portion of the treatment system is 80 to 125 psi(pounds per square inch) at 110 CFM(standard cubic feet per minute). On Sheet 4, Piping and Fitting No. 10.8, the Workplan specifies a 100 psi test of the lines with no pressure loss for one hour. Considering pressure losses due to friction in the piping will reduce air pressure at the wells, does the design of the piping allow pressures exceeding 100 psi, or will the compressor regulator be locked to not exceed 100 psi? If neither response is applicable, provide another explanation. Response No. 2 On Sheet 4, section 10.4, of the Design Plans, ENSR provided specifications to the Contractor to test the installation and fittings of the AS conveyance piping. A pressure of 100 psi was selected as the appropriate criteria to determine if the pipe cement and fitting assembly were completed in a manner that satisfied the manufacturer's recommended and/or industry's standard installation techniques. The compressor selected for the AS system was designed to operate at 100 psi, however, the compressor will not be locked at 100 psi. The AS conveyance piping was designed to accommodate operating pressures ranging from 110 to 125 psi. The maximum design pressure is 150 psi, which is the capacity of the compressor. Additional Comment No. 3 1 cannot concur to the Workplan and the Addendum at this time. The CAO No. 5-00-0707, Order#10 states the Discharger"...is to implement and continuously operate, the approved remediation system, with the exception of periodic and scheduled maintenance. Any interruption in the operation of the cleanup system(s), other than for scheduled maintenance, without prior written approval of the Executive Officer, is a violation of this Order." Once all of the additional requests are addressed satisfactory, Regional Board staff will brief and seek written approval from our Executive Officer. Response No. 3 EMC and ENSR have engaged the property owner, Stone Brothers and Associated General Partnership (Stone Bros.), with the implementation of the Design Plans. ENSR planned to conduct a portion of the trenching activities during the night time hours to alleviate potential impacts to the high traffic area of Sherwood Mall. In communications with the City of Stockton, the personnel from the Planning and Building Departments indicated that construction activities on the Site would not be allowed during the hours of 10:00 PM to 7:00 AM. ENSR plans to meet the week of February 18, 2008 with personnel from the City of Stockton Planning and Building Departments to confirm acceptable construction hours and the availability to work during night time hours at the Site. Once the hours of operation for the Site's activities have been established and accepted by the City of Stockton, ENSR can provide the CVWB with a tentative schedule with dates for the proposed fieldwork and reports. Additional Comment No. 4 Under the circumstances(the work is necessary and appropriate) and with the condition that the work proceed in a timely manner, Regional Board staff will not recommend enforcement action if the AS/SVE system is back in operation by the 31 July 2008. 01231-154 ENSR AECOM