2408 RAVENNA ST 2016-01-01 MF Import

l � � tieotecnnica►�ngmeeru��ncyu�� ` � Lowell Short Plat June 2, 1999 NCA File No.259499 Page 4 � Test Pit 1 wes located just west of the sanitary sewer vauh boz, and appeared to bo wid�in the senitary sewer hench along the planned roadwey. Fill wds entounteml to the bottoal of tho exploratia� at 6 fat• I The apparent sewer trench backfili consisted of soR sih with fine sand and gravel to a dept6 of 2.5 feet. Below 2.5 feet the beckfill consisted of loox,sihy fine sand w�th trece gravel• Test Pit 2 encountered loose fill to the bottom ofthe explrnation st 8 feeG This soil consieted of fine sand aith silt and uace �vel, roots ead organics. An ADS flexible plastic pipe was observed in the side of the test pit. We suspect that this pipe may be a drainpipe from the existing garage,howeva, this was not eonfirtned. Fili wes also encow�tered in Test Pit 7 and Test Pit 8, accavnted just downslope end upslope of the e�cisting garage• "Ihe fill depth was 1.5 and 1.0 feet in Tert Pit 7 aud Test Pit 8, raspectively. A weathercd horizoa was observed�.mder the topsoil leyer in Test Pit 5. Ihis layer extended to a depth of I feet,end consisted of loose,�ilty fine sand with pravel and roots. Soils underlyine the topsoil,weathend soil end fitl varied from medium densa to drnx ssada to medium stiff co very stiff silts. The sand layers varied in the amount of stlt, from n'ace ro high sih content,and in some plaees contained silt beds and silt chunks. Hydrolo¢ic Condltions , Modrate to heavy ground water seepage was observed in Teat Pits 1;2,3 attd 7 in tLe eest 6alf of the site at a depth of 3.5 to 6.5 feet. Within the higher western portion of the site�the only ground water observed wss at a depth o;8 feet in Test Pit 4. These ground wutar elevations u�assumed to be near seasonal high water levels, due to the springtime explorations and peiticularly high rainfall totals in the proceeding morths. Test Pit 1 was excavemd immediately upslope of the vault and moderate ground weter seepege was encountered ec 3.5 fee� There is water flowing out of the matal lid over the ssaituy sewer vau�t 'Ibis water seepege is mm�ing across the ground surfece to the wetland downslo}x tn 1}►e eest- We do not lmow the exact source of this water. It eonld eome frotn subsurface ground water, or it could rtsult front water traceling in the sanitary sewer trench bedding. We did not obsecve eity odor associated with the waur, howe�er the water could poss�bly be associeted with a leak in the sewer pipa NELSON-COUVRETTE&ASSOCIATES, INC. ...... .................................................... . O � .............