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Home My WebLink AboutSD-484-10FROM PCDS#3 12" 67.57' 12.00' - 20.20' 35.37' 49.39' 33.29' 1111 I, -III -1 �1411 -I"1= Iii III �=!11- II_ I.II'�=11' ,IIS,-il_�=1,�1.- x.11 -1i ..ill--I� -- ;II-- I LI I_ I-IIC-III=-i III -1 III _I I_I I' f rl 1-1 -1 -n -1' �I r — — — — 45' BEND L1' I =111 —all III IIS I IIL=.III III SII III ISI III I_I-III I� 45 BEND O O NV. 1N=236.0 (TYP) 45 BEND 4 -0Z NON -WOVEN r4" OBSERVATION PORT -- FILTER FABRIC TO ,ENCLOSE =' WITH CAP (PERFORATED TOP AND O BELOW STONE - INSTALL A = SIDES of THE SYSTEM =� MINIMUM OF TWO (2) 1 PORTS IN EACH FIELD) 12" HDPE LATERAL (TYP) 'III O 1 " TO 2" DIA. WASHED 44.67 46.67 =1 III CRUSHED STONE 1 NV. 1N=236.0 II- (DOUBLE WASHED =III X11 -- (TYP) PREFERRED I- ) 45' BEND III OIL O l I INV. OUT=237 0 1111 rl ii �T IIC �ti I) 0 1236.0 O 1-_ II' INV. lN= i (TYP)mi 1 1� 1 �' 11 I I— 1-r 1i7-7 ,IIL_Ir 1 —III— I I I —I I rl-1 I I I! �-1 I I—I 771 11—III—III--III—IIIIII—III—III—I 1 -r-I ISI -I -Ir_I 11- -I ! I=77'I-1- 1—! 11-1 I f—! I!=1 i I-=1 I I-=1 I I -I 11=1 11--I I'� 1 1 1=t I I =1 f 41 11�1' l�1 I 1I I—I 11=111- I I Ii 11= 1 =1 I I I 61.47" USE 56 STORMTECH MC -4500 CHAMBERS 63.54' f 67.57' PLAN I � I" TO 2" DIA. DOUBLE WASHED CRUSHED STONE OBSERVATION PORT WITH CAP (PERFORATED BELOW STONE - INSTALL A MINIMUM OF TWO 2 PORTS IN EACH FIELD 4" LOAM &SEED MIN.(, FINISHED 4 OZ NON -WOVEN FILTER FABRIC TO ENCLOSE CHAMBERS EL. OVER CHAMBERS=240.33 959 COMPACTED FILL TOP AND SIDES OF THE SYSTEM 11 1 ill-' III III -III - 12" -lir 111-111 ill ,Ij-1i1 III==1'I I!1=III III= - FROM PCDS 3 I I 1 TOP STONE EL. =239 00 _ 109 C_C (MIN) CHAMBER TOP =238 00 11 r' : I' 12" (MIN)! 1=1 TO I PROPOSED 6 INLET OUTLET =236 23711 SUBSURFACE I �j III 60l-IIII III lNFIL TRA TION SYSTEM - :BOL CHAMBER =233 001 T� BOTTOM EL. =232.25 1 19 (MIN) 1 _ 1 -, f II -I III -III- III _ty,-„ -'II 111.`;II I ''ui -111-1I —„ 1—I -1 =12 (MIN) ==R001 - 11 Qi =19'=. 1100 j 7 0 TYP. _--I _ --- --I --- -I - --- - (MIN) _ ITT---- (TYP.) _ I_, .. II .—i -_I . II_ _ _III -1 I 1 -,LL , III -� �- II-1II —L1 --',77 NA 1 III—III — —III ;III_; i1 1 �NAURALLY 7r1=Tr-1i' riTr 1111 PROVIDE MINIMUM 4 FEET SEPARA77ON -I OCCURRING SOIL USE 56 STORMTECH BETWEENTHE BOTTOM OF THE 9 INCH - (DEPTH VARIES) MC -4500 CHAMBERS WASHED STONE LGROUNDND THE ESTIMATED SEASONAL WATER TABLE OR LEDGE. 11 I SECTION 11.. C -C /S CENTER r0 CENTER. 2. PROVIDE 9" MIN. SEPARATION BETWEEN ROWS OF CHAMBERS. J. CONTRACTOR SHALL REMOVE ALL TOPSOIL, SUBSOIL, FILL MATERIAL AND OTHER IMPERVIOUS LAYERS WITHIN THE FOOTPRINT (AND TWO (2) FEET BEYOND) OF THE PROPOSED SUBSURFACE INFILTRATION SYSTEM. EXCAVATION SHALL BE FILLED WITH MATERIAL SPECIFIED IN SECTION 15.255 (3) OF THE STATE ENVIRONMENTAL CODE, TITLE 5 UP TO THE PROPOSED ELEVATION OF THE WASHED STONE. I _ PROPOSED SUBSURFACE Mi ma nnni BASIN -1 (Nor ro scALE) A CLERK OF THE TOWN F LEX, i MASSACHUSETTS HEREBY CERTIFY THAT HE NOTICE OFAPPROIVALT OF THIS PLAN BY THE LEXINGTON PLANNING BOARD HAS BEEN RECEIVED AND RECORDED AT THE OFFICE AND NO NOTICE OF APPEAL WAS RECEIVED DURING TWENTY DAYS NEXT AFTER SUCH RECEIPT AND RECORDING OF SAID NOTICE. LEXINGTON PLANNING NOTE- FOR DETAILS NOT DEPICTED HEREON, DATE: REFER TO STANOAIiD DETAILS AS PROVIDED TOWN CLERK BY THE TOWN OF LEXINGTON ENGINEERING DEPARTMENT. _ I' SIJ rz I. THE PROPOSED STORM DRAINAGE DESIGN FOR THIS SUBDIVISION INCLUDES SUBSURFACE INFILTRATION SYSTEM DESIGNS FOR LOTS 3, 4, 5, AND 6 TO CAPTURE A PROPOSED ROOFI RUNOFF UP TO 2,800 SF OF ROOF AREA AND UP TO AN ADDITIONAL 200 SF OF MISCELLANEOUS IMPERVIOUS AREAS (PATIOS, WALKS, ETC.) FROM THE REAR OF LOTS 3 4, 5, AND 6. IF ANY OF THE PROPOSED DWELLINGS FOR LOTS 3, 4, 5, AND 6 EXCEED 2,800 SF OF ROOF AREA THE PROPOSED SUBSURFACE INFILTRATION SYSTEM DESIGN SHALL BE REVISED BY THE DESIGN ENGINEER PRIOR TO THE SUBMITTAL OF THE BUILDING PERMIT APPLICATION FOR EACH INDIVIDUAL LOT. 4'" OBSERVATION PORT WITH CAP 4 OZ NON -WOVEN FILTER (PERFORATED BELOW STONE INSTALL 'A FABRIC TO ENCLOSE TOP STORMTECH SC -740 MINIMUM OF TWO (2) PORTS IN EACH FIELD) qND SIDES OF THE SYSTEI (51 "Wx85.4"LxJO'H) _ -_.I -I.I I I- I I OF _ _._. - -- - I I:--I� I � I I � I I I I— FROM T ROOF ':J.1 DRAIN � A :- 17 ONO o III ��I �- 6" SCH 40 I: PVC LATERAL II (TYP) �1I o 6" SCH 40 i= PVC ROOF DRAIN LEADER I 77777 i i:__7 I� �-_I I__I=-1 1=1-_ 36.04" 38.04' 1 " TO 2' DIA. WASHED CRUSHED STONE PLAN (DOUBLE WASHED PREFERRED) BUILDING FOUNDATION 1" TO 2 DIA. DOUBLE WASHED CRUSHED STONE OBSERVATION PORT WITH CAP (PERFORATED ROOF BELOW STONE - INSTALL A MINIMUM OF TWO LEADER (2) PORTS IN EACH FIELD) SURCHARGE PIPET 4" LOAM &SEED MIN. FINISHED 4 OZ. NON -WOVEN FILTER FABRIC TO ENCLOSE I 95i'COMPACTED FILL � / CHAMBERS EL. OVER CHAMBERS=+4.83 TOP AND SIDES OF THE SYSTEM _-III 12'" -111 III III 6"" SCH OCK 40 PVC -M-1111 TOP( STONE i (MIN) --- SPLAS Lh I III 111 - 111 IIL - EL. 3.50 _ 57" C -C CHAMBER TOP _+3.00 ' 6 (MIN)! TO PROPOSED I " -I I� 6'I INLET .AgN..: �I_ III Iii= SUBSURFACE - INFILTRATION SYSTEM II L BOZ CHAMBER =10.50 {III BOTTOM EL 0.00 � .: I . �_- 6 (M1N)1 . i 12 MlN _= 51 t l 51r - `.157' _ - T 1=1 I�(' --! ' 1 I_ 1 I 1 I _ 4 (MIN) 1= > III 111_111 iifl= T lff =III = ;III—II II—I1� III TYP ISI III .I.. In I -III —III !'�s�Jcwl 11; 111=III 111 t -'II �I_I11- I;I;,I!'„-III I I I b NA URALL YT t i- PROVIDE MINIMUM 4 FEET SEPARATION OCCURRING SOIL-- BETWEEN OIL BETWEEN THE BOTTOM OF THE 6 INCH = (DEPTH VARIES) -I USE 30 STORM TECH WASHED STONE LAYER AND THE ESTIMATED SC -740 CHAMBERS SEASONAL HIGH GROUNDWATER TABLE OR (6 ROWS OF 5 CHAMBERS) LEDGE. SECT70N 1. C -iC IS CENTER TO CENTER. 2. PROVIDE 6" MIN. SEPARATION BETWEEN ROWS OF CHAMBERS. J. CONTRACTOR SHALL REMOVE ALL TOPSOIL, SUBSOIL, FILL MATERIAL AND OTHER IMPERVIOUS LAYERS WITHIN THE FOOTPRINT (AND TWO (2) FEET BEYOND) OF THE PROPOSED SUBSURFACE INFILTRATION SYSTEM. EXCAVATION SHALL BE FILLED WITH MATERIAL SPECIFIED IN SECTION 15.255 (3) OF THE STATE ENVIRONMENTAL CODE, TITLE 5 UP TO THE PROPOSED ELEVATION OF THE WASHED STONE. 4. THE PURPOSE !OF THIS DESIGN IS TO SHOW A TYPICAL SYSTEM FOR EACH LOT MORE DETAILED DESIGN WILL BEI SUBMITTED, FOR EACH LOT TO THE BUILDING INSPECTOR PRIOR TO CONSTRUCTION. SEE DRAINAGE NOTE ABOVE FOR MORE INFORMATION. PROPOSED SUBSURFACE /NFlL TJ?A nOiv SYSTEM (FOR LOTS, • 3.4.5.6) (NOT TO SCALE) i BE-EUCH TREE LANA, DEFINITIVE SUBDIVISION SITE DETAILS M ctOF MA LOCATED LOCATED IN L T LEXINGTON MASSAC N�VAK � � HZ SETTS No. 50 `696 y (MIDDLESEX COUNTY) �a J roaPREPARED FOR ti_ RFI' FAMILY TR US7I I SCALE: NOT TO SCALE DATE. FEBRUARY 111, 2020 MERIDIAN 1 ASSOCIATES REWSIONS 500 CUMMINGS CENTER, SUITE 5950 69 MILK STFIPET, SUITE 302 BEVERLY, MASSACHUSETTS 01915 WESTBOROUGH, MASSACHUSETTS 01581 TELEPHONE: (978) 299-040.7 TELEPHONE: (508) 871-7030 1 W W W.MERIDIANASSOC.COM 1 4/7/20 REVISED PER (',ENG)NEERING COMMENTS CSB MAC G. No. 5862—DEF—DET NO. DATE DESCRIPTIONeY cHK'o SHEET No. 10 OF 10 PROJECT No. 5862 I 1 Copyright ® by Mcridiun Associates, Inc. ( All rights,cwe d S - 4 94-t