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Pilkington North America, Inc. - 3- 10 September 2015 <br /> 3. The WP Addendum proposes the same fourteen soil boring and first groundwater <br /> investigation locations as the Work Plan. Seven of the fourteen locations are considered <br /> downgradient. One of these downgradient locations should be selected for at least one <br /> of the three planned deep soil cores to provide information regarding downgradient <br /> stratigraphy. <br /> 4. The site Furnace Building basement contains four dewatering sumps. Regional Water <br /> Board staff requested the locations of all four sumps be shown in Figure 2. The two <br /> southern sumps are shown in Figure 2 of the WP Addendum, but the two northern <br /> sumps are not delineated. Please include all Furnace Building basement sumps in <br /> Figure 2. <br /> 5. The WP Addendum introduction includes a statement regarding the site property <br /> comprising seven parcels totaling 113 acres, but provides only three parcel numbers. <br /> Please clarify the all parcel numbers associated with this property. <br /> 6. DPE system wastewater is proposed to undergo onsite granular activated carbon (GAC) <br /> treatment prior to disposal in the onsite combined (sanitary sewer/storm drain).system. <br /> Please provide appropriate notification and obtain necessary clearance, as provided by. <br /> the permit to discharge the remediation system waste stream in the onsite combined <br /> system. <br /> 7. Semi-annual monitoring is proposed for a year following implementation of the DPE <br /> remediation system. Concurrence from Regional Water Board is recommended prior to <br /> discontinuation of monitoring activities. <br /> Staff of the Regional Water Board conditionally concur with the WP Addendum under the <br /> condition that the above-stated Regional Water Board comments are satisfactorily addressed in <br /> writing prior to commencement of the proposed work plan. Please notify staff a minimum of 72 <br /> hours before initiating field work to facilitate staff inspection of the work. Please include time <br /> schedules for remediation work and post excavation sampling plans. <br /> If you have any questions regarding this letter or project, you may contact me at (916) 464-4825 <br /> number or by email at apalmeraa.waterboards.ca.aov .. <br /> Sincerely, <br /> Ann M. Palmer <br /> Water Resource Control Engineer <br /> Site Cleanup Section <br /> Cc: William Little, Advanced GeoEnvironmental Inc., Stockton, (email) <br />