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MINUTES July 29, 1993 4 BOARD OF HEALTH <br /> USGS's mapped, in an academic kind of investigation. " 1160' to <br /> 80' deep is where the aquifer of Cape Cod meets the marine <br /> waters of Nantucket Sound and some places where you have a <br /> pumping well near that interface you can get salt water in- <br /> trusion. " "This is because you are in the area where the <br /> flow from fresh water meets the area where salt water has in- <br /> truded because of the pressure of the water. " "The two mix <br /> and there's diffusion both ways. " "This is occuring 100' <br /> down. " "Flat Pond is 4' deep and has no bearing on its <br /> j flusing characteristics." "We mapped the recharge area and <br /> figured out the major components of the hydrologic budget. " <br /> Mr. Worden stated, "The shallow nature of the pond, the <br /> very low gradient of the water table and setback distance of <br /> the proposed development from the pond give us factors which <br /> combine to give us an extremely safe buffer and leads me and <br /> my colleagues to believe there would be absolutely no impact <br /> on Flat Pond. " <br /> Mr. McQuaid questioned Mr. Worden as to the distance a <br /> leaching facility must be to go under the pond based on your <br /> vertical flow rate. <br /> Mr. Worden responded, "The septic system must be .014' <br /> for the effluent to go under the pond. " <br /> Mr. McQuaid questioned the hydrogeologists calculations. <br /> This matter was continued pending a site visit scheduled <br /> for Saturday and further hydrogeological calculations. - .. <br /> • t <br /> FOR DISCUSSION <br /> JOHN'S POND - Mr. McQuaid relayed, "We received round two of <br /> the surface water sampling results for John's Pond, (Brick- <br /> yard Road beach) , which was tested for pseudomonas and <br /> streptococcus. " "Those results dropped to within recommended <br /> levels however, the Briarwood beach, which was not initially <br /> sampled but was on this second round, has elevated counts of <br /> pseudomonas and streptococcus. " "What we will have available <br /> by tomorrow afternoon is round three of the sampling <br /> results. " "At the Selectmen's request the County will also <br /> perform pseudomonas and streptococcus sampling on Ashumet, <br /> Santuit and Mashpee-Wakeby ponds." "Those results will be <br /> available tomorrow afternoon also. "- <br /> Mr. McQuaid relayed, "The most recent v.o.c. testing at <br /> John's pond revealed toluene at 0.8 p.p.b. . " "The drinking <br /> water standards for toluene is 340 p.p.b. . " ' "Toluene was <br /> found at the Briarwood beach area at 0.8 p.p.b. , the beach at <br /> Brickyard Road at 0 .9. p.p.b. and the public beach at 0 .8 <br />