Presented at the UXO/Countermine/Range Forum 2009

1. Commercial Application of the Physics-Based Test Strip and Seeding Approach Ryan Steigerwalt, P.G., Weston Solutions, Inc. Jim Austreng, P.E., California Department of Toxic Substances Control C. Scott Goulart, Aerojet-General Corporation UXO/Countermine/Range Forum 2009 Orlando, Florida

2. TALKING POINTS Introduction and Conceptual Site Model Project planning and requirements Implementation of the Geophysical System Verification (GSV) process Planning and development Test Strip construction Seeding program Operations Results

3. INTRODUCTION Project site located in Chino Hills, CA Facility owned by Aerojet-General Corporation Perform MEC detection and removal in areas not previously investigated Use DGM in all accessible areas Perform mag & dig surveys in all other areas where possible Work was conducted with DTSC oversight Dec 2008 – Feb 2009

4. CONCEPTUAL SITE MODEL CSM identified anticipated munitions and facility uses Extensive geophysical prove-outs were conducted at the facility in 2004 Evaluated detection capabilities of various instruments and techniques Reported the type and quality of data required for subsequent MEC detection and removal activities

5. WORK PLAN Use results from previous GPO Develop data collection parameters and quality control Perform a limited GPO and gain concurrence Mobilize remainder of crew Collect data

6. PROJECT REQUIREMENTS In November 2008, wildfire struck the facility and cleared vegetation Need to perform technically defensible work, quickly, before vegetation returned Mobilize ASAP

7. FIELD VARIANCE Began site setup Preparing to perform limited GPO Project team discussed GSV and potential application No GPO grid construction Start collecting data immediately No required review cycle Joint QC/QA Can continuously monitor performance Developed a brief field variance to document GSV approach- test strip construction and seeding Gained regulatory concurrence

8. GSV DESIGN Test Strip Construction Seed anticipated munitions items at detection depth objectives Place seeds at least favorable orientation Establish multiple Test Strips if necessary to increase efficiency Perform daily to evaluate equipment functionality

9. GSV DESIGN Seeding Program Use similar items and burial depths as Test Strips Initially place one seed within each 100-ft x 100-ft grid block Relax seed frequency to one seed per acre if performance is acceptable

10. GSV IMPLEMENTATION Equipment EM61-MK2 towed sled 4 sensor RTK-GPS Navigation Test Strip Perform background and baseline survey prior to production mapping Run Test Strip daily with instrumentation Perform concurrent with standardized QC function tests Evaluate response and monitor results

11. SURVEY SUMMARY Digital Geophysical Mapping Summary Completed approximately 9 total acres Includes rough and steep terrain Spanned several weeks All DGM was performed using a towed array sled

12. TEST STRIP 1 RESULTS Day 1 (Baseline) Day 2 Day 3 Day 4 Day 5 Day 6

13. TEST STRIP 2 RESULTS Day 8 Day 9 Day 10 Day 11

14. TEST STRIP SUMMARY Direction of Travel

15. SEEDING RESULTS 19 total seeds (30mm, 25mm, 20mm) Check response against Test Strip results Test Strip Avg ~8 mV Response (mV) Test Strip Avg ~6 mV Test Strip Avg ~12 mV Seed + x Target Response (mV) Response (mV)

16. QUALITY ASSURANCE Regulatory site visits Industry Standard Targets and inert items 1-inch by 4-inch pipe nipples Vertical (most favorable) at 11-inches Horizontal (least favorable) at 7-inches

17. SENSOR RESPONSE CURVE

18. BENEFITS Means to monitor geophysical system performance daily and consistently Shortened schedule Re-allocated resources to risk reduction efforts Planning variance drafted onsite No duplicate QC/QA Began production mapping next day

19. LESSONS LEARNED Still need to plan ahead Define objectives Seeding program Schedule Ensure Test Strip seeds are isolated from other influence Use Industry Standard Targets to reduce variability Reality works

20. QUESTIONS? Montauk Monster