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Daniel Guerra, R.S. - 2 - December 19, 1986 <br /> The only indications of current rodent infestion were runways and <br /> droppings attributed to meadow voles, Microtus californicus, <br /> observed among the older stockpiles in the southwest corner of <br /> the site. <br /> Conclusions: This site has a high potential for becoming a <br /> problem source of ground squirrels, which would be injurious to <br /> neighboring agricultural operations. Its potential for rat <br /> infestation is lower, due to limited supplies of water, but the <br /> continued dumping of household garbage there can be expected to <br /> increase the potential for rats. <br /> Recommendations: Some suggestions for permit requirements to <br /> reduce the potential for rats would he to fence the site to <br /> prevent unauthorized entry. Household garbage, especially cans <br /> and other containers capable of holding water, should be removed. <br /> Additional requirements would be necessary to prevent ground <br /> squirrels. Placing a finite time limit on how long a stockpile <br /> will be allowed to stand would be helpful, but it would not work <br /> if the piles are merely rotated at a permanent site. A site <br /> should be located that is a sufficient distance from cropland to <br /> prevent ground squirrels moving from harborage in the stockpiles <br /> to neighboring crops. I suggest you contact the Agricultural <br /> Commissioner for specific recommendations concerning ground <br /> squirrels. <br /> Please feel free to contact me again for any additional <br /> assistance I can provide. <br /> Sincerely yours, <br /> x"v x&/,/,,��-'7a-z Y-) <br /> KENNETH H. HANSGEN <br /> Associate Public Health Biologist <br /> Vector Surveillance « Control Branch <br /> cc: C. Leland Hall, Director <br /> of Environmental Health <br /> KHH/nd <br /> A:GRAPEVIN <br />