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:7 <br />ALP <br />�A�Vj <br />.� 0 <br />May 5, 2014 <br />11 <br />Mr. Michael Carroll, P.E. <br />San Joaquin County Department of Public Works, Solid Waste Division <br />P.O. Box 1810 <br />Stockton, California 95201 <br />Re: Responses to Central Valley Regional Water Quality Control Board Comments <br />Construction Quality Assurance Report Corral Hollow Closure Cap Extension <br />Dear Mr. Carroll, <br />Following is Geo -Logic Associates' (GLA) response to the comments from the Central Valley <br />Regional Water Quality Control Board (CVRWQCB) in their letter dated March 10, 2014 <br />regarding the review of the Final Construction Quality Assurance Report for the Corral Hollow <br />Closure Cap Extension. The comments provided by CVRWQCB staff are in bold print. <br />In summary, the construction of the cap extension was in accordance with the specifications. <br />Statements in the text of the Final CQA Report to the contrary were in error. Documentation of <br />the lift thickness was included in the Daily Reports (Appendix A) of the Final CQA Report. <br />Documentation of particle size was included in Appendix C. We have attached this information <br />for ease of review. <br />CVRWQCB Comments <br />1. Table 02200-2 in the technical specification dated 5 November 2012 requires that the <br />maximum relative compaction of the vegetative soil layer be no greater than 88 <br />percent. GLA reports in the Table of Appendix C.3 that the percent relative <br />compaction of vegetative soil layer in all soil samples range from 90.2 to 95.6 percent. <br />These values exceed the technical specifications. <br />Technical Specification Section 02200 3.10 G.1. states that "each lift of vegetative soil <br />shall be compacted to the applicable minimum relative compaction specified in Table <br />02200-2". Table 02200-2 shows a value of "88%" for vegetative soil compaction. Our <br />CQA staff did not notice the "max" in small type in that table, thus proceeded in <br />accordance with the specifications, on the basis of the text and value in the table, <br />ensuring that compaction was a minimum of 88% relative compaction. <br />13939 West Colfax Ave., Suite 220 • Lakewood, Colorado 80401 - T 303.232.3310 • F 303.232.3346 • www.geo-logic.com <br />