A surface ditch sample (Lewis Ditch S) southeast of Lewistown Road/Airpark Road, see Figure 1.

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Irma Gregory
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1 Ms. Karol Akers, Hazardous Materials Manager Virginia Department of Transportation 1618 Swinton Lane Richmond, Virginia Subject: Subsurface Investigation Report Addendum Proposed Lewistown Road Improvements (Route 802) VDOT Project No.: (90347) Cardno MM&A Project No.: VRICH259 Cardno MM&A Richardson Road Ashland, VA Phone Fax Dear Ms. Akers: Cardno MM&A provides this Subsurface Investigation Report Addendum for the proposed Virginia Department of Transportation (VDOT) Lewistown Road (Route 802) improvement project in Hanover County, Virginia. VDOT previously assessed the project for environmental contamination concerns through a June 4, 2008 Subsurface Investigation Report (by MM&A) for traffic signals at Lewistown Road/Ramp D and a July 3, 2013 Subsurface Investigation Report (SIR) (by Cardno MM&A) for the entire project. The 2013 report described the following: Cardno MM&A s implementation of the VDOT developed sampling and testing program. Testing of samples from proposed project excavations such as stormwater drainage features, bridge piers, traffic signal pedestals, and in plan utility relocations. The comparison rationale/procedures to determine which soils were considered impacted (mainly shallow soils along drainage ditches upper one to two feet). PURPOSE VDOT conveyed that the design has been updated since the 2103 report. Thus VDOT requested Cardno MM&A to compare the prior testing data from both studies with the new plan sheets to re-evaluate to include proposed drainage installations, underdrains and cuts. SIR SUMMARY From the 2013 SIR, impacted soils were identified in the following areas: Boreholes near/in drainage ditches both east and west of the Travel Centers of America Truck Stop entrance from Lewistown Road from 0-1 feet (HA-01, HA-02, Lewistown Ditch N and ), see Figure 1. A surface ditch sample (Lewis Ditch S) southeast of Lewistown Road/Airpark Road, see Figure 1. Boreholes (NP and S) from 0 to 1 foot at the current and proposed bridge piers along I- 95 beneath Lewistown Road, see Figure 2. Australia Belgium Canada Colombia Ecuador Germany Indonesia Italy Kenya New Zealand Papua New Guinea Peru Tanzania United Arab Emirates United Kingdom United States Operations in 85 countries

2 DESIGN PLANS Cardno MM&A reviewed the current design, which has some changes to the plans in which the 2008 and 2013 studies were based. Changes include different municipal water and gas line alignments and elimination of new drainage under Lewistown Road. In comparison with the June 2008 SIR, no cuts/excavations are confirmed in the current design at those prior borehole locations. However, the updated plans as depicted on Figures 1-2 in Appendix A show construction features at impacted areas identified in the 2013 SIR (shown in orange), which is summarized as follows. The proposed installation of a new drainage ditch west of the Travel Centers of America Truck Stop entrance remains unchanged from the previous study. The length of the proposed ditch (39+86L 41+35L) in the impacted zone is 120 feet with an impacted depth of 2 feet. Located east of the entrance, plans still remain unchanged to remove the remaining drainage ditch (44+42L 45+10L) and install a new surface drainage ditch/pipe east of the truck stop entrance from structure 6-08 to 60 feet west of A new 12-inch diameter water line was previously proposed to include the drainage ditch area on the northeast corner of the truck stop entrance. New plans now have the proposed water line installed under Lewistown Road outside any impacted zones as shown on Figure 1. A new 2-inch gas line is now proposed to include the drainage ditch area on the northeast corner of the truck stop entrance as shown on Figure 1. However due to the small size of the gas line, it is expected that any soils excavated will be redeposited into the excavation. Similarly, traffic signal conduits 3-inches in diameter are also proposed through the same northeast corner. Any excavated soils for the small conduits are also expected to be redeposited back into the excavation. The existing storm drainage pipe underneath Lewistown Road east of the truck stop entrance will not be replaced, but instead lengthened (6-11 to 6-12), see Figure 1. This extension is approximately 45 feet long in an impacted area 2 feet deep. Plans for the excavation of new piers underneath the new proposed Lewistown Road Bridge over I-95 have been altered to include additional excavations for shoring. The new plan sheets still contain proposed stormwater piping and proposed pavement underdrains. The upper one foot of soil here was defined as impacted as shown on Figure 2.

3 MANAGEMENT OPTIONS Soil The July 2013 Subsurface Investigation Report described the various soil management options including replacing into the same excavation, potential re-use and disposal. Table 7 in the Subsurface Investigation Report provided a cost estimate for the transportation and disposal of the impacted soils to a disposal facility. Thus, VDOT requested an updated Table 7 to reflect changes to the disposal cost estimate. Note that impacted volumes are no longer separated by existing and proposed right-of-way (R/W), since R/W issues are no longer pertinent to the project. Updated Table 7 Disposal Cost Estimate Site Name Sample Detection Anticipated Impacted Extent Impacted Volume/Tonnage Disposal Cost Estimate* TA Truck Stop /Zn HA-01/02/ O&G & TPH- DRO, Cd, Zn Install new drainage ditch west of truck stop entrance (40+56L L) Remove remaining drainage ditch (44+42L-45+10L) and install new surface drainage ditch/pipe east of truck stop entrance from structure 6-08 to 60 feet west of ft length X 5ft width X upper 2ft depth 117 total ft length X 5ft width X upper 2ft depth 67 tons X $65/ton = $4, tons X $65/ton = $4,225 Southeast of Lewistown Rd/Airpark Rd Lewis Ditch S/TPH-DRO Downflow of existing pipe outlet to new proposed pipe (6-11 to 6-12) to 15ft south of ft total length X 10ft width X upper 2ft depth 50 tons X $65/ton =$3,250 I-95 Bridge Footprint NP and S/ Pb & Cd Excavate new piers with pier protection system Excavate drainage 5-02 to 5-11, 5-11 to 5-09, 5-03 to 5-09, 5-04 to 5-03, 5-09 to 5-10, 5-10 to 5-05, 5-05 to 5-07, 5-06 to 5-07, 5-07 to 17ft south (Main Station to ) Excavate two underdrains (UD-4) on north and south bound I-95 median side 190ft total length X 15ft width X upper 1ft depth 279ft total length X 3ft width X upper 1ft depth 245ft total length X 1ft width X upper 1ft depth X 2 UDs Conversions are as follows: Ft 3 /27 = yd 3 Yd 3 X 1.5 = tons TOTAL= 416 TONS $27,040 * Cost Estimate includes incidentals such as plastic sheeting based on 5% of the anticipated disposal fee. * Cost Estimate includes incidentals such as plastic sheeting based on 5% of the anticipated disposal fee. 159 tons X $65/ton =$10, tons X $65/ton =$3, tons X $65/ton =$1,820

4 RECOMMENDATIONS Based on the findings for this Subsurface Investigation Report Addendum of the proposed Lewistown Road improvement project, VDOT should consider the following. Update the special provisions with this analysis of the updated design. LIMITATIONS The summary represents an appropriate level of inquiry to satisfy the requirements as specified by VDOT and included in our work plan/opinion of probable cost (approved on September 3, 2014). The conclusions of this summary are based on the available data and the current plan sheets. Additionally, the limits of contaminated materials expected in excavations are estimates based on available data. Should road plans change such as modified construction details, then the conclusions should be re-evaluated. Cardno MM&A is pleased to serve as VDOT s environmental consultant for this project. Please do not hesitate to contact us should you have any questions or concerns. We look forward to working with you on future projects. Sincerely, Joshua P. Shrader Project Scientist for Cardno MM&A Direct Line josh.shrader@cardno.com James T. Martin, Jr., P.G. Senior Scientist for Cardno MM&A Direct Line james.t.martin@cardno.com Enclosures

5 Subsurface Investigation Report Addendum APPENDIX A FIGURES Error! Reference source not found. Cardno MM&A 5

12" W 019-02 019-03 B 002-01 020-03/TW-01 SOIL BORING/TEMPORARY WELL LOCATION 020-02 SOIL

WATER LINE SEWER LINE GAS LINE 50' 0 50' SCALE: 1" = 50' Note: Base map from VDOT Plan Sheets 5

LEWIS DITCH S D 8" S LEWIS DITCH N HA-03 020-03/TW-01 MG LEWISTOWN ROAD 3, LLC 8" S 8" S 12" W

Lewistown Road Phase II Hanover County, Virginia DRAWN: CHECKED: DATE: SCALE: FILE NO.

6 12" W B /TW-01 SOIL BORING/TEMPORARY WELL LOCATION SOIL BORING LOCATION LEWIS DITCH S HAND AUGER LOCATION B PROPOSED SIGNAL PEDESTAL IMPACTED ZONE WATER LINE SEWER LINE GAS LINE 50' 0 50' SCALE: 1" = 50' Note: Base map from VDOT Plan Sheets 5 & 6; Project E GAS 12" W Travel Centers of America C HA-01 HA-02 LEWIS DITCH S D 8" S LEWIS DITCH N HA /TW-01 MG LEWISTOWN ROAD 3, LLC 8" S 8" S 12" W 12" W Shell Station DESIGNED: JPS Figure 1 Virginia Department of Transportation Lewistown Road Phase II Hanover County, Virginia DRAWN: CHECKED: DATE: SCALE: FILE NO.: PROJECT NO.: DES JTM 09/17/2014 AS SHOWN VRICH259_Site Map.dwg VRICH259 Prepared For: OFFICE LOC.: Ashland, VA. USA

DESIGNED: JPS Figure 2 Virginia Department of Transportation Lewistown Road Phase II Hanover County, Virginia DRAWN:

7 S S S Bridge Bridge Footprint Footprint SP I-95/Lewistown I-95/Lewistown Road Road N N NP N NP HAND AUGER LOCATION (Composite Sample) IMPACTED ZONE 50' 0 50' SCALE: 1" = 50' Note: Base map from VDOT Plan Sheet 5; Project DESIGNED: JPS Figure 2 Virginia Department of Transportation Lewistown Road Phase II Hanover County, Virginia DRAWN: CHECKED: DATE: SCALE: FILE NO.: PROJECT NO.: DES JTM 09/24/2014 AS SHOWN VRICH259_Site Map.dwg VRICH259 Prepared For: OFFICE LOC.: Ashland, VA. USA

July 3, Prepared for: Ms. Karol Akers Virginia Department of Transportation 1618 Swinton Lane Richmond, Virginia 23238

July 3, Prepared for: Ms. Karol Akers Virginia Department of Transportation 1618 Swinton Lane Richmond, Virginia 23238 Phase II Environmental Site Assessment Proposed Improvements (Route 802) VDOT Project Number 0095-042-716 (90347) Hanover County, Virginia July 3, 2013 Prepared for: Ms. Karol Akers Virginia Department