1. times are approximate 9:30 Welcome – Ben Ericson 9:40 Commissioner Marty Suuberg remarks and Q&A 10:00 Soil Management Interim Policy – Paul Locke 10:45 Guidance Updates -Vapor Intrusion guidance (public comment overview & next steps) Gerard Martin - LNAPL guidance (supplemental comments & next steps) – Ken Marra -Anthropogenic Fill/Historic Fill guidance development Pat Donahue -1,4-dioxane assessment fact sheet development - Liz Callahan -MCP technical corrections, AUL compliance letter 12:00 Adjourn WSCAC Meeting Agenda March 5, 2015

2. WSCAC Meeting Dates through June 2015 MassDEP, Boston, 2 nd floor 9:30 am - noon March 5, 2015 April 16, 2015 (May 21, 2015) June 17, 2015 Dates in ( ) are tentative meetings to be used as needed.

3. Guidance Updates

4. 1,4 Dioxane - When to Assess “Emerging Contaminant” http://www.mass.gov/eea/agencies/massdep/toxics/sources/14-dioxane.html Found with chlorinated solvents (used as stabilizer), especially 1,1,1-TCA Exposure concern for drinking water ORS drinking water guideline and 2014 MCP GW-1 standard 0.3 ug/l Requires modification/use of more sensitive analytical methods to achieve GW-1 standard Reporting Limit

5. 1,4-Dioxane Guidance on Sampling and Analysis When it is appropriate to analyze for 1,4- dioxane in groundwater at 21E sites Summarizes physical and chemical properties, environmental health impacts, existing state and federal standards and guidelines Lists 1,4-dioxane sources (products/processes) Identifies appropriate analytical methods

6. Not to be confused with Drinking Water Consumer fact sheet http://www.mass.gov/eea/docs/dep/toxics/stypes/dioxane- dep-fs.pdf http://www.mass.gov/eea/docs/dep/toxics/stypes/dioxane- dep-fs.pdf

7. http://www.mass.gov/eea/agencies/massdep/cleanup/approv als/activity-and-use-limitation-compliance-reminder.html

8. 2350 letters sent to persons listed in our database as owner of property with the AUL Most of the updates (coming in as phone calls, BWSC127, copies of deeds) are in – updated information for 353 RTNs About 250 additional letters will be sent to newly identified property owners AUL Compliance Letter

9. MCP Technical Corrections Available at State House Bookstore (2 packets) We will be updating the MassDEP web MCP with new version soon