
Staff of the California High Speed Rail Authority announced their preference for a west-of-Hanford rail alignment and station just east of 13th Ave,north of 198 earlier this Spring.The rail alignment and station would be located below grade says the staff report in a 3 mile, 40-foot-deep trench to keep noise down as the trains speed through this populated part of the county near Armona.
But a key issue that appears to have escaped the attention of the engineers and planners could literally sink the idea.
Kings County just west of 13th and spanning a large swath of the county has a high impermeable clay layer – close to the surface – pooling groundwater a mere 10 to 15 feet below ground level says Kings County Water District general manager Don Mills.
“It’s an anomaly in this area.” Across the railroad tracks toward Hanford ground water is at 100 feet or more he says.
Asked if the CHSRA representatives knew about the shallow water, Mills noted that “I don’t know why they did not check with us or any local agency I know of.”
The water district has a groundwater map that shows groundwater depth measurements made last fall showing levels 160 to 200 feet in Hanford and east of Hanford as well – but a sudden raised clay layer generally west of the BNSF tracks at 198.The shallow water pool runs north and south from Flint Ave to Kansas,some 11 miles and is around 4 miles wide to the east and west – spanning 13th to 17th Ave. Altogether this sprawling, raised clay layer is 40 to 50 square miles.
Kings County civl engineer John Zumwalt says the perched water in this area is well known locally as irrigation water hits the clay layer and stays there.
Zunwalt says where the two levels meet near 13 Ave there is sudden drop off that can create almost a waterfall effect as the groundwater rushes to the lower level.
No mention of the shallow water levels along the potential rail corridor is made in the CHSRA reports reviewed by this reporter.The EIR refers to the average groundwater levels in the Hanford area as 60 ft or more and displays a chart of depth to groundwater that lists Hanford at 100 to 120 ft.
Mills and Zumwalt each caution that they are not engineers and assume one could build a water tight tunnel to run the train in but offer the that the higher water levels could have complicating implications and unanticipated costs.
Ironically the April staff recommendations suggested building the western bypass route had:
-”fewer impacts to aquatic resources than the BNSF Alternative and generally incorporates the least impacts to aquatic resources of the individual geographic alternatives.
Fewer construction impacts such as noise, farmland, air quality, cultural resources, parks, than the BNSF Alternative;
– Least constructability issues and lowest cost alternative adding that the estimated cost of the Preferred Alternative was about $800 million less than the BNSF route.”
After hearing the staff recommendation in April the board of the CHSRA was expected to vote in May,then postponed to June on whether to endorse the staff.
Instead the item was again pulled from the June agenda.
A few weeks ago board chair Dan Richard visited the Kings Board of Supervisors and said the board was now “neutral”on which alignment to select.“Right now, we’re not leaning toward either one,” Richard said.
Sources say the board has by now been made well aware of the shallow groundwater issue and that may be a reason why they have backed off the western route choice.
Meanwhile Tulare County and Visalia have been lobbying the board members to take a new look at the east-of-Hanford station site at 43 and 198,12 miles closer on a round trip basis from Tulare County.
Supporters of an east side route says it will better serve the 1 million people who will be living in the area in the future- almost two thirds of them well east of the station;It is a faster route. Add up these two factors and ridership will be much higher; impacts with dairies can be mitigated in two thirds of the cases by simply relocating the manure water line,not impacting the dairies overall.
There was never a noise issue east of Hanford and no plan to trench the track.
If there are construction issues on a western route and the Authority wants to stick with that alignment – CHSRA might be forced to build the station and track at ground level.










