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February 25, 2002 <br /> Job Number:LGO1-397 <br /> Page 9 <br /> L. <br /> Borings B B-5 were converted into two (2 lation test holes. The total depth <br /> of P-3 (B-4) was .5 feet and the total depth of P-4(B-5)w 9 feet. Both percolation tests <br /> were located about 5 feet apart. The percolation test bonngs were drilled utilizing a 6-inch <br /> diameter truck mounted auger rig. The casing used for the test was 2-inch diameter PVC pipe <br /> with an open end on the top and bottom. Perforations were made on approximately the last 12 <br /> inches of the casing. Six (6) inches of "pea gravel'was placed in the bottom of the hole, the <br /> casing was installed, and one(1) foot of "pea gravel"was backfilled in the annular space. The <br /> percolation test borings was pre-soaked 24-hours prior to the test. <br /> A four(4)hour percolation test was conducted for each hole. The percolation tests were <br /> observed by Ms. Lisa Medina of the San Joaquin County Environmental Health Division on <br /> January 29, 2002. The result of the test indicated a satisfactory percolation rate was achi�Y�d,i�n„ <br /> boring P-4 B-5 erco ahon ever P-3 (B-4) did not achieve a satisfactory percolation <br /> rate. Table 6 provides a summary of all the percolation tests performed. <br /> Table 6. <br /> The following table presents a summary of all the percolation tests performed. <br /> Pere.Test,(boring), Date of Test Depth of Test Percolation Rate <br /> location <br /> P-1,(B-1), 12/11/01 3.0 No movement <br /> eastern septic system <br /> P-2,(11-3), 12/11/01 5.0 No movement <br /> eastern septic system <br /> P-3,(B4),orchard 01/29/02 19.0 83.3 min/in <br /> P4,(B-5),orchard 01/29/02 3.5 1.2 min in <br /> VII. NITRATE LOADING STUDY <br /> A build up of nitrates in ground water can cause a temporary blood disorder in infants <br /> called methemoglobinemia(blue baby syndrome). Serious and occasionally fatal poisonings of <br /> infants have occurred following the ingestion of water containing nitrate concentrations greater <br /> than 10 mg/1 nitrate as N or 45 mg/1 nitrate as NO3. <br /> Because of the concern of nitrate leaching into ground water, a nitrate loading analysis <br /> was required by the County to estimate the average nitrate concentration of percolating water for <br /> the subject parcel. If a site is contributing excess nitrogen to ground water,ground water quality <br /> V o.s®4 <br />