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SDP 2020-0006; PALOMAR FORUM PARCEL 'A' AMAZON VEHICLE STORAGE; BMP CERTIFICATION - BIO BASIN GRADES - BMPS A, B, C, D; 2022-01-28
EXCEL ENGINEERING LEVIN & DENTINO INC. D.B.A. EXCEL ENGINEERING CORPORATE: 440 State Place x Escondido, CA 92029 (760)745-8118 x Fax 745-8134 January 28, 2022 RE: Certification of Bio Basin Grades (BMPs A, B, C, & D) Precise Grading Plans for Palomar Forum Parcel ‘A’ - Amazon City of Carlsbad Drawing No. 530-6A, Project No. SDP 2020-0006 To Whom it May Concern: Excel Engineering performed several field surveys and construction activity observations, and obtained photographs from the site contractor relating to the four installed bioretention basins on the above-referenced project. The field surveys consisted of the following: - Basins A, B, and D Excavation, Liner Install, Rock Install (November 23-27, 2021) o Photos taken by Wet Utility Contractor - Basin Certification Plats by Excel Engineering Survey Crews (December 23, 2021) o Plats for Certification of Basins A, B, and C bottoms and top of rock o Plat for Re-Staking of Basin D to shift northerly - Basin Finish Surface Verification for Basins A, B, and C (January 21, 2022) - Final Basin installation with landscape complete – All Basins (January 27, 2022) The inspections listed above occurred during construction and in several instances, corrections were required to be made to verify the subsurface installations were indeed constructed correctly. After each notification to the field, the wet utility contractor performed those corrective actions and our survey crew and engineers verified those revisions met the design. On January 21, 2022 a representative of this firm conducted a field inspection of the Bio Filtration basins. The purpose of this inspection was to visually confirm that the basins were built to plan, that the plantings were in place, the inlets, the overflow outlets, and the storage depths were correct. In all cases, the bioretention basins’ grades were found to be constructed in substantial conformance with the approved grading plans for the City of Carlsbad. Follow-up photos were taken on January 27th, 2022 to show that the basins received their final mulch layers. See attached photos of multiple stages of construction for all four BMPs. If you have questions or need any additional information, please do not hesitate to call our corporate office. Sincerely, Robert D. Dentino, PE Co-President Sheet 3 and 10 of Approved DWG 530-6A 7<3,&$/'(7$,/6 ,.,,_D ,.,,_, ,.,,_, --c ,.,,_, MQE(TNl.tel<I· LHIRCIIHPIT QPAlfZiAtERAIJ.L, """' ""'" ,.,..,,.,.,, ""'""'"" ""'""""' PAHi/Al RE/ll"KN """""""' BIO-BASIN SUMMARY TABLE om:111£ A2 AJ 8 8"'"5EH/ """" Al I:'!? (NO<} ~ ,.,, 0 E 016'll/#' 1¥A/EIIN ,,,,,,.,,,,,, -{NCH) aEAN {NCH) {NCH) fW S1"/CIIH ~'ioiiii" """' (WT) """ -Of/T ,.,.,.,. IE/YA 11Wll 91' (MHY) ,,.,,,,,,.,,,, ,,,, rn; ,,0 ,0 @ID 1/ll; 225 (Mf#j l[J) I!!'.) IOI Im /,0 ,0 ~ 'Ill! ,,, -~ ltSJ z:,,; Im "' ,0 ~ ([m 225 ••J @.I Iii!'! 2172 Im ,,, ,0 @ID 'Ill! ,,, ..... "1!J Im ~·.: . ~;:/r:~ -c:-i;.¾;;;;;;;;;;;;;;;;;;;;;;;t;;;;;~;;;;;~~l ~lfZ SHRAIE _ ,---______ Jj iAtER MSHHJ M2 .57 SIOC ii .. • : _. : _-·tl IINIIUll6"UAAIE7& rJJWrff!lf"CFBASN ,_cr;JW'ACllll flVAl ~(TJHR _________ ¥11\ P£RR¥W£l) /NO? 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DATE INITIAL DATE NTW.=~NG}™™?RCE~~~~E:0~/"1/?~RA;~~NO. fll.EPIKM:•(760) 745-81/8 I~ REVISION DESCRIPTION nlll'II __... CITYAPPROVAI. 1~~ ~~;~llsop 2020-ooosll s30-6A s s s s s s s s s s s s s s s s>K/E'KE ZW K K> WZ</ E' ZWK K > WZ</E 'ZWKK>WZ</E'ZWK K >WZ</E'ZWKK>WZ</E'ZWKK> WZ</E 'ZWKK>WZ</E'ZWK K >WZ</E 'ZWKK>WZ</E'ZWK K > WZ</E 'ZWKK>WZ</E'ZWKK> WZ</ E'ZWKK>WZ</E'ZWKK >WZ</E'ZWKK>WZ</E'ZWKK > WZ</E '6,1*/(6+((7%036,7(3/$1 SINGLE SHEET BMP PLAN PALOMAR FORUM PARCEL 'A' PMTr lr£SPQliSlllt£ RR I/MllDIANtE.· _,,,,,,, --------0 'v V ~-~ ~M~~QJ,l ----0--VD-. -.---ir~ ------~ ' ---r~~~??~~~~~~~~~:~~~~~:~~~~?~~~;~i~~~ff?:~~~~~~~~~~~~~~~fl~~2=:~i~ ~ Hf 5(V1Hqpft2S",jWJd'F VJ::WfK+?'( Pl Si'W'f '\ ;;,: PERMANENT WATER QUALITY TREATMENT FACILITY """"'"M>a"""-t<l'°'lmlrn'°"""'11=""'"""'-DETAIL WATER QUALITY SIGN-PLACED AT EACH BIDFILTRATIDN BASIN NOlE:ALLBICFILTRATKlNN1.0SWIU. ~VEASIGNPOSTEDTOBE VISIEUATALLTIMES. ~ ~ DETAIL "NO DUMPING" AT CATCH BASINS NOTE:AU. 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NO~RJl}Cl'Rf7'0SEDBIIPSQVTMSSHEITJll1HaJT PWltR Affll'OVAl !HOii iN£ CITYENalEER. ..t NOSUISnrvnavsro IH£llATERW. C¥i TJffS<RPl.ANTIN() TJffS/lllHaJTPWICWAffll'OYAlfHOIIIH£CITYENGIN£Dl. -t NO .xaFANCY llll.J. B£ CRAN!CD UNIZ. lH£ arr INS1£C!lav s:::,;::%:Jo~~"':ffTFCW.AffllmitffE"BIF RUERRJMAINIENANCCAGREEJENT/JOCIMNT. SEF PRO.ECT SIIIIP FCW A/JalltNAJ. N'Z>llf.Am:11! 000 BKn.lltA!KW 0 ::,,n:w 0 0 0 "" s-.. ,,, """"""' "" N/, BMPTABLE ~"" '""" 6; 7, 8 6;?, 8 6; 7, 8 6; 7, 8 -=-""""'"" N/' -_, N/,< 'AS BUil T' "'--DATE [:llrl CITY OF CARLSBAD l'"'ETSI :::ti ======t:::I ====:t:tl ==========================================t:::I ====j::::i======ttl ====j::::1====j:::::l 1·~L~~~:~~:•I::;:;:T:::T -AMA;:N •~ 0.Alf';~r I T T I IGR202HXl13 APPR0',-£0: JASON~~~::;' '£ At:l: -15629 EXPli'Anat !2-J!-22 f--f-----+-----------+-+--f----<---1 ===========--~= ~ ~~ DAlE UUW. DATE INITIAL DAlE NTW.=~NG}™™?RCE~~~~E:0~/"1/?~RA;~~NO. fll.EPIKM:•(760) 745--81/8 I~ REVISION DESCRIPTION nlll'II __... CITYAPPROVAI. 1~~ ~~;~llsop 2020-ooosll s30-6A November 23-27, 2021 Installation Photos !0%.#44+:'& '4%3+25+10 #-'0#5' #5 #/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' N/A - LINER AND PEA GRAVEL INSTALL - INFORMED CONTRACTOR THAT SIDE WALLS IN ROCK LEVEL NEED TO BE VERTICAL BMP A !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' - LINER AND PEA GRAVEL INSTALL - INTERIOR SIDEWALLS IN ROCK LAYER NOT COMPLETELY VERTICAL - SUBSURFACE AREA AND VOLUME STILL VERIFIED TO MEET DESIGN BMP B BMP B - LINER AND PEA GRAVEL INSTALL - INTERIOR SIDEWALLS IN ROCK LAYER NOT COMPLETELY VERTICAL - SUBSURFACE AREA AND VOLUME STILL VERIFIED TO MEET DESIGN !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' BMP B BMP B - LINER AND PEA GRAVEL INSTALL - INTERIOR SIDEWALLS IN ROCK LAYER NOT COMPLETELY VERTICAL - SUBSURFACE AREA AND VOLUME STILL VERIFIED TO MEET DESIGN - LINER AND PEA GRAVEL INSTALL - INTERIOR SIDEWALLS IN ROCK LAYER NOT COMPLETELY VERTICAL - SUBSURFACE AREA AND VOLUME STILL VERIFIED TO MEET DESIGN !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' MARK-OUTS FOR ROCK LAYERS AND MEDIA LEVEL CHECKED AND VERIFIED - UNDERDRAIN ELEVATION VERIFIED BMP B BMP B - MARK-OUTS FOR ROCK LAYERS AND MEDIA LEVEL CHECKED AND VERIFIED - UNDERDRAIN ELEVATION VERIFIED !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' BMP B BMP B - LINER AND PEA GRAVEL INSTALL - INTERIOR SIDEWALLS IN ROCK LAYER NOT COMPLETELY VERTICAL - SUBSURFACE AREA AND VOLUME STILL VERIFIED TO MEET DESIGN - UNDERDRAIN ELEVATION VERIFIED - LINER AND PEA GRAVEL INSTALL - INTERIOR SIDEWALLS IN ROCK LAYER NOT COMPLETELY VERTICAL - SUBSURFACE AREA AND VOLUME STILL VERIFIED TO MEET DESIGN - UNDERDRAIN ELEVATION VERIFIED !0%.#44+:'& '4%3+25+10 +045#..#5+101(.+0'3 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 045#..#5+101( 2'# )3#6'. #-'0#5' #5 #/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' BMP B - LINER AND PEA GRAVEL INSTALL - ELEVATIONS CHECKED OUT - CONTRACTOR TO REINSTALL NORTH END TO ENSURE PROPER SURFACE AREA COULD BE ACHIEVED AT FINAL ELEVATIONS BMP D - LINER NOT COMPLETELY VERTICAL - SUBSURFACE AREA AND VOLUME STILL VERIFIED TO MEET DESIGN !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 *151431/#+.71) '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 2/ !2.1#&'&7 '00)'$3'54'0 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' - LINER AND PEA GRAVEL INSTALL - INFORMED CONTRACTOR THAT BASIN INSTALLED TOO CLOSE TO CURB ON SOUTH SIDE AND THAT THE NORTH SIDE SHOULD BE EXTEND SOME TO ALLOW FOR THE 3:1 SURFACE SLOPES TO NOT "MISS" THE UNDERGROUND STORAGE INSTALL BMP D !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' BMP D BMP D - LINER AND PEA GRAVEL INSTALL - INFORMED CONTRACTOR THAT NORTH SIDE LINER NOT INSTALLED VERTICAL - ISSUES WITH SUBSURFACE VOLUMES AND AREAS - INFORMED CONTRACTOR THAT BASIN INSTALLED TOO CLOSE TO CURB ON SOUTH SIDE AND THAT THE NORTH SIDE SHOULD BE EXTEND SOME TO ALLOW FOR THE 3:1 SURFACE SLOPES TO NOT "MISS" THE UNDERGROUND STORAGE INSTALL - LINER AND PEA GRAVEL INSTALL - INFORMED CONTRACTOR THAT NORTH SIDE LINER NOT INSTALLED VERTICAL - ISSUES WITH SUBSURFACE VOLUMES AND AREAS - INFORMED CONTRACTOR THAT BASIN INSTALLED TOO CLOSE TO CURB ON SOUTH SIDE AND THAT THE NORTH SIDE SHOULD BE EXTEND SOME TO ALLOW FOR THE 3:1 SURFACE SLOPES TO NOT "MISS" THE UNDERGROUND STORAGE INSTALL !0%.#44+:'& '4%3+25+10 #-'0#5' #5 2/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 !0%.#44+:'& '4%3+25+10 #-'0#5' #5 #/ !2.1#' #5 #/ !2.1#&'&7 &)#3 13'01 +.' #/' 9 "'45 '%*1053#%5+0)0% 3+05'&10 10 16 #5 2/ 1$ #3.4$#&/#810 #3-+0)15 #).'3 #3.4$#&#.+(130+# #)' BMP D BMP D - 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I "'"' " /"" " I ~"' " " /: I I/"" " " " I'--I / / / / / / / / // \ ),/// / / / / ✓< / ~ / / / / / / .,.,,,,,,\ / / / -< ,..... / ,..... ,..... ..<, ,..... ----,..... 1/,.....,.....-\ \ , / ~A~ BASIN D(RESTAKE)12/23/2021.::-'=_ ~ r -? --------·---\.y ~---_::--. ~ --_-__ -_---_---_----__ -_--_-------- ---~ -.-_----:C-£~-. ---::-__--_ -_ -=-=---_--~. ~ -.. -. f"'~-~1:'t ~~1~' : ~ ;::i: __ ; ~~-~--_-------~:~-i.~:~-v-td-_ ~:~ 0g"<-~~~-~ t --~ i -~---.-- - - ----y-----------I ---__ -_--_-_ ~--t --_--,0 --"' - - - - --I,,,,_ ----. --- - - --) ---\ \ --- - ---;:-, J~-- - - - -. ~ -_· - -_-_:: = .. - -+/ - --'-\~ ~ - -~)-- - -(-T-,-r--~-· :/J~---_ =--0~ -=-=-~-=-=-) • - -cl-- -I-,. --"--\. - - -- - - -t<J--• - -. - ---~ -~~--~ ✓----'c:f'-:r-~) -<--~.J_ - -- - • -'""' - • -i: •-;;--T -\. -- --~ - ---'--""='". - - - - - . - . - - - - --.(u., --- - -ll'<:-.1' ----- - - -t ----- -- --------.A.2631-2630 -------_-_-:;:__ --:-;,:-_-::.-:: ~ ----- -~ - - -. --L/o-. ----2637 = --==---~~5 TL ----~ -c::::=:..-. -=-------------=--=-.:2636--:::-, --=c:_ --=--=----.;:::: ~-~==--~~s~_T,· _420.63",-',, ___ /TL C-2.35' @ 3.32' (141:1}L/C-1.25' VERT BTT~ 5 TL--~ L/O _ :s=: _ ~ ~-=--~ ,_ ·__L-=1-~ ____ = 42l_;,9,,7/~22.70 £C?:\ ± -(1.00:1)//C-1.25' VERT BTTM~AL_) _ __,,,L" -------/ --------I .,,... · ~3_39· (1.44:1);; _ _ _ _ _ >--____ ~-5 VERT BTTM _ 1 • ~~-.:__2.-t_ ----+--'----,2635 , L/O L/O /421.47 ·-· 421.64 420.21 .., I -I ---.., \ ---,--~ ~--~-r--1-, --\--~ --I I I I I I I I I I ( { ' \ \ ', '-I I I / J / ----/ J -/ ... ...--:r --~1--/ ---------I --,--7---ffi --,, I ,,,----r-~ ~ ,. -t--t/ I / I ~_Q.;\1 ~ January 21, 2022 Site Visit BASIN C (PRE-MULCH) BASIN A(PRE-MULCH) BASIN B(POST -MULCH) January 27, 2022 Site Visit – Final Surface Verification BASIN A(POST-MULCH) BASIN A(POST-MULCH) BASIN A(POST-MULCH)_.",,,·~-., f -:-·, , ''{: '<-< ... ', BASIN D(POST-MULCH) BASIN D(POST-MULCH) BASIN B(POST-MULCH) BASIN C(POST-MULCH) BASIN C(POST-MULCH)