Page 207 - _ 180314 Special Yucaipa GSA Packet

Edwin H. Lin, PG, CHG
Principal Hydrogeologist

EDUCATION

MS, Groundwater Hydrology, Flinders University (Australia), 2006
BS, Geological and Environmental Sciences, Stanford University, 1998

REGISTRATIONS

Professional Geologist California, No. 8312
Certified Hydrogeologist California, No. 907

PROFESSIONAL SUMMARY

Mr. Lin has 20 years of experience in groundwater basin management, including managed
aquifer recharge (MAR) evaluations, basin conceptual model development, and water supply
exploration. Mr. Lin has published papers on well clogging mechanisms and pre-treatment
options for Aquifer Storage and Recovery (ASR) in cooperation with the Australian
Commonwealth Scientific and Industrial Research Organisation. Mr. Lin has also been
responsible for the design and construction of municipal water supply and monitoring wells
using a variety of drilling methods, and analysis of aquifer pumping tests. He is skilled in
Geographical Information Systems (GIS), database development, geochemical analyses, and
application of advanced environmental statistics. A few recent projects are described below
demonstrating Mr. Lin’s expertise with emphasis on MAR projects.

Ford Pond Infiltration Tests for Indirect Potable Reuse Study, Santa Clara Valley Water District
Since 2016, Todd Groundwater has conducted hydrogeologic investigations to evaluate the
recharge feasibility and soil infiltration capacity of multiple sites across the Santa Clara Valley
Subbasin for SCVWD’s Indirect Potable Reuse (IPR) program. Field investigations have
included cone penetration soundings (CPTs), installation of nested monitoring wells, field-
scale infiltration testing, laboratory soil permeability and leaching analysis, groundwater
quality sampling, and geochemical modeling for metals dissolution potential. As Project
Hydrogeologist, Mr. Lin designed and implemented two 10-day concurrent percolation tests
at the Ford Ponds Site and adjoining county-owned property. Mr. Lin directed the
construction of two test basins (with 15 to 30 feet in sidewall length) and installation of flow
control and water level monitoring equipment. Results showed that vadose zone sediments
at the Ford Ponds Site and adjacent County-owned parcel have favorable surface recharge
potential with rates exceeding 10 feet/day. While long-term infiltration rates are expected to
be lower, test results combined with subsurface lithologies indicate that the existing Ford
Pond alone may be sufficient to recharge target recycled water delivery rates (4,200 AFY);
however, multiple ponds would provide more flexibility for maintenance and drying.

2490 Mariner Square Loop, Suite 215 | Alameda, CA 94501 | 510 747 6920 | toddgroundwater.com
Yucaipa Groundwater Sustainability Agency - March 14, 2018 - Page 182 of 226