CORRESPONDENCE_1971-1981 - Laserfiche WebLink

Home Browse Search

%00010' Mr. J. Don Layson 28 March 1972 San Joaquin Local Health District - 2 - 1. Presence of minor landslides on the north flank of the syncline. Triggering of slides by earthquakes or lubrication by percolation of fluids could cause cata- strophic downstream damage. 2. Surface soil was fractured, due to desiccation or to orogenic causes. The depth, extent, and influence of these fractures with respect to fluid movement needs to be assessed. It appears that protection of ground and surface waters might well be insured at this location. More extensive infor- mation will be required before the Regional Board will approve it as a Class I disposal site. As brought out in the discussion of the tour party, this might be done in a staged manner. The first stage would involve a detailed geologic study to show whether the site in fact does comply with geologic require- ments as defined in the new Subchapter 15, California Water Code, adopted 2 March 1972. The second stage would require study for design involving elements of hydrology, drainage, physical barriers, and other engineering parameters as well as some geologic certification involving subsurface studies (drilling, water testing, per- meability, etc. ) . It was noted that a portion of land that topographically would be a worthwhile addition was outside the proposed site. It was concluded in discussions that an effort be made to acquire this property. One important aspect of the acquisition would be to reduce the number of controls for protection and isolation of the site. The second site is a proposed Class 11-2 waste disposal area near the Northern California Youth Center southeast of Stockton, adjacent to Littlejohn Creek. The site appears to have merit, but will also require de- tailed geologic and engineering study before the Central Valley Board will approve it. The proximity of Littlejohn Creek will require flood studies and estimates of berm heights construction for protection. The present ground water level is low enough to insure a thick intervening section of sediments, but the ef- fects of possible recharge from the Folsom-South project will need study. The area is geologically composed of flat lying sediments of mostly clay and silt to a minimum of several tens of feet in