Protect Coyote Hills

Facts >> Drinking Water

In our area, an average of 40% of the total water supplies comes from the Niles Cone Groundwater Basin (See map below. Coyote Hills is outlined in green on the left; Ardenwood Boulevard and Paseo Padre Parkway are nearby).

Rainfall, stormwater runoff, proposed man-made fill (in an attempt to raise housing units above flooding and sea level rise) and grading excavation of soils all increase soil erosion and potentially allow toxic soils to be transported into nearby waterways such as Crandall Creek (see 3 photos below), which would further contaminate groundwater.

The Environmental Protection Agency suggests that testing of toxaphene degradation products be done for human safety reasons given that they have been shown to have serious health effects. Some toxaphene degradation products in humans are twice as carcinogenic as the original toxaphene.

The toxic degradation products of toxaphene evidently have not been analyzed or reported on the proposed site, but recommendations to analyze and monitor them have been cited in the scientific literature. So local residents do NOT have any assurance that their and their children’s health would not be adversely affected. 

In addition to potential serious contamination of the water supply, there may not be enough water to 2030 for the Alameda County Water District. Therefore, the final environmental impact report (released September 2010) states that is a “significant and unavoidable” cumulative impact for the proposed Patterson Ranch project. This may result in water rationing for current local residents.

Impact of development damage (loss of open space) to our aquifer:

  • Open space provides a means for the aquifer to be replenished (see picture below).
  • The greater an area is paved over, the greater the amount of water lost to replenishing the aquifer and which is diverted into the drainage system and ocean.
  • A greater population demands a greater amount of water and at the same time takes up more surface area, which in turn decreases the replenishment of water to the water source, in this case, the aquifer in a time of drought.
  • The proposed 520 housing units in front of Coyote Hills create a serious potential problem of toxic soil contamination of drinking water.
  • Can we trust utility companies, for example, PG&E overseeing the gas pipelines, to ensure public safety?



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