COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

California R%ional Water Quality ontrol Board ::' -�~' , Central Valley Region j Robert Schneider,Chair �-9..r. Nvinston H.Hickox Grafi• Davis Secretnr3 fnr Sacramento Main Office 'C'0"r, Pi'r Environmental Internet Address: htip:!h\-\\w.swrcb.ca.gov/rwgcb5 Protection 3443 Routier Road.Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(91 G)255-3015 16 January 2002 Ms. Sandra Glenn MonierLifetile, LLC 7575 Irvine Center Dr., Ste. 100 Irvine, CA 92618-2930 REVIEW OF GROUNDWATER MONITORING PLAN AND VADOSE ZONE INVESTIG14TION ACTION PLAN SUBMITTAL, MONIERLIFETILE'S LATHROP AND FRENCH CAMP FACILITIES, SAN JOAQUIN COUNTY We have reviewed your submittals Groundwater Monitoring Plan and Vadose Zone Investigation Action Plan, submitted by FAX on 11 January 2002. Staff understands that MonierLifetile will submit a detailed work plan for vadose zone investigations at the two facilities by 21 March 2002; and anticipates completing the investigations submitting feasibility studies and remedial option reports for soil cleanup by 1 January 2003. Board staff concurs with the vadose zone investigation action plan and looks forward to reviewing the detailed work plan. The Groundwater Monitoring plan proposes to install three 2-inch monitoring wells at each of the facilities. The approximate monitoring well locations are shown on site plans attached to the report. Staff recommends that French Camp well FCW-3 should be re-located between the Drainage Ditch and the southwest corner of the waste pile. Staff understands exact well locations will depend on site access restrictions and on the locations of underground utilities. In general monitor wells should be located as close to the waste piles as possible. Hydrogeologic conditions at these facilities are essentially unknown at this time and MonierLifetile should be aware that additional monitoring wells may be required when groundwater flow directions are established. Monitoring wells should be constructed with minimum well screen lengths, 10 feet in most cases, and should be designed to sample the uppermost aquifer. Please submit an addendum to the Groundwater Monitoring Plan that: 1. Re-locates FCW-3, 2. Proposes to use minimum well screen lengths, and 3. Proposes to design the wells to sample the uppermost aquifer zone. Additionally, you may wish to consider including a revision to the plan that allows an option to use micro-purging techniques for well sampling. This is a recommendation,not a requirement; micro- purging gives equivalent results and can significantly reduce wastewater handling. Upon submittal of an acceptable addendum, Staff will concur with the plan. California Environmental Protection Agency / Qi Recycled Paper "Me energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5