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PROOFROLLING OBSERVATION REPORT <br /> Report Number: 70121071.0002 rerra- can <br /> Service Date: 09/13/12 5240 Green's Dairy Road <br /> Report Date: 09/14/12 Revision 1-Corrected undercut total Raleigh,NC 27616 <br /> 919-873-2211 <br /> Client Project <br /> Orange County,NC Walnut Grove CC Expansion <br /> Attn:Jeff Thompson NC Hwy 86&Walnut Grove Ch,Rd. <br /> 200 South Cameron Street Cedar Grove,NC <br /> Hillsborough,NC 27278 <br /> Project Number: 70121071 <br /> Service Requested By: WL Bishop <br /> Earthwork Contractor: LJ Martin&Sons <br /> Observed Location(s): Northern end of dry pond <br /> Equipment Used: The above-referenced area was proofrolled with a fuIlydoaded pan. The equipment made at least 6 <br /> passes in a parallel pattern. <br /> Subgrade Description: The subgrade was reviewed and consisted of dark brown clayey sand. <br /> Elevation: Based on conversations with Carey with WL Bishop the subgrade ranged from approximately 7 to 6 <br /> feet below final grade. <br /> Summary: Based on our observations,the subgrade soils appeared firm and stable except in six areas where the <br /> soils appeared to soft and wet during the application of compactive efforts. Refer to the comments <br /> section for further information. Results were reported to Carey at the completion of today's activities. <br /> Additional Comments: Six areas showing significant deflection were identified and field marked. It was recommended that <br /> the areas be undercut within the field markings to depths determined during excavation activities by a <br /> Terracon representative, <br /> Measurements were as follows: <br /> 1. 21'x 45'x 1.5'for 52.5 cubic yards(excavated today) <br /> 2. 40'x 45'x 2'for 113.3 cubic yards(excavated today) <br /> 3. 20'x 20'(not yet excavated,area around buried drain line) <br /> 4. 20'x 28'x 4' for 83.0 cubic yards(excavated today) <br /> 5. 14'x 18'x 6"for 4.7 cubic yards(excavated today) <br /> 6. 15'x 25'(not yet excavated,area adjacent to water-filled ditch) <br /> Areas undercut today were backfilled with a 2'bridge lift of suitable fill that was cut from the eastern <br /> half of the site. The material was tracked in and will compacted and tested at a later date. Areas 3 and <br /> 6 will be undercut at a later date. Total volume of soil undercut today was 253.5 cubic yards. <br /> Terracon is providing undercut quantities for information only. We cannot authorize additional cost. <br /> Any additional cost due to undercutting should be authorized by the owners prior to undercutting. <br /> Services: Visual subgrade evaluations by proofrolling with a rubber-tired vehicle. <br /> Terracon Rep.: J.Aaron Ezzell,EI,PG <br /> Reported To: Carey <br /> Contractor: WL Bishop <br /> Report Distribution: <br /> (I)Orange County,NC,Emailed (1)HDR Engineering,Inc.,Emailed <br /> (1)orange County,NC,Emailed (1)Orange County,NC,Emailed Reviewed By / � <br /> (1)orange County,NC,Emailed (1)WL Bishop,Emailed rvw2:acl J.Aaron Ezzell,EI,PG <br /> (1)Wt.Bishop,Emailed <br /> The tests were performed in general accordance with applicable ASTM,AASHTO,or DOT test methods. This report is exclusively for the use of the client <br /> indicated above and shall not be reproduced except in full without the written consent of our company. Test results transmitted herein are only applicable to <br /> the actual samples tested at the location(s)referenced and are not necessarily indicative of the properties of other apparently similar or identical materials. <br /> AF0007,ss8.10,Rev.1 Page 1 of 1 <br />