SU0000517_SSNL - Laserfiche WebLink

Home Browse Search

File No. 20-3445-C- - � KLEI \ FELDER March 4 , 1991 having a maximum percentage passing the No. 200 Sieve of 40 , a maximum Plasticity Index of 8 , and a minimum Resistance-Value of 40 . Such imported fill should be compacted at a moisture content at or near optimum. We recommend that samples of any proposed imported fill soil be submitted to the soils engineer for approval prior to being taken to the site. Engineered Fill should be placed in horizontal layers a maximum of 8 inches in loose thickness and be compacted to a minimum of 90 percent of the maximum dry density as determined by the ASTM D-1557 test procedure. We recommend that structural and trench backfill be placed in the same manner as Engineered Fill . In our opinion, trench backfill farther than 10 feet from drilled piers may be jetted. However, if jetting is performed, sufficient time should be set aside to allow consolidation to occur. In addition, density tests should be taken to confirm the recommended compaction is achieved. In areas to receive asphaltic concrete, we recommend that the subgrade soils, to a depth of at least 6 inches, be compacted at or near optimum moisture content, to a minimum of 95 percent of the maximum dry density. Seutic Suitability We understand from Mike Huggins of the San Joaquin County Environmental Health Department that the Septic Suitability Study performed for the Christian Covenant Church is adequate for this site. However, we have been asked to comment on the potential for significant changes in groundwater quality. We understand that the groundwater is approximately 23 feet below the ground surface. Historically, limited use facilities such as churches, are not considered large waste water generators. The underlying soils are also interbedded with considerable silt content which provides excellent filtration capacity. For these reasons, it is our Copyright 1991 KLeinfelder, Inc. 7