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CITY OF DIAMOND BAR � �
DEP.ARTMENT bF CQMMUNtTY&DEVELOPMENT SERYICES
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May 31,2018
Brett Woodall
Daiinghaus CanstrucNon
Emali: �9�¢iro�:�sfvecx4ia��nm
SUBJECC: INSPEGTION At�3 COiNP4E11dN REPORT
PQIJNDAYWN STABIIJZ/ti10N
14�0 VaEley Vi�ta Drlve
Dlemond 8ar,GA
i►raJect Mo.s�s.00s
The foiiowing report presents my o6servatlans and assessme�t of tha c�pieted
underpinning and foundartian ataWlizatlan at tlre above building in Dla�nd Bar. Thl�s work
was performed in act�Mance wi#h�e tofiowing report and pfens:
+ Geu�technical fiecommendstlons, November 13,201?,by Helt►idrAssodat�,lnc.
* Founda#ion Stabllizstio�a �PEans(6 sh�ets}dated Febn�ary 15,2018
Engineer Inspectlons were performed on MarCh 5,2018,May 15,2018,and May 23,2Q18.
We a�so revlewed and an�iyzed the fleld Instal�ation lo�s fa S7 reslsRanc;e piers and 32
heIICa1#19back 8nchors.
��rar+�r��i�sraudn�
The resl�kkance plers were Installed at th�iocatlons shown an the attached pler pi�n. Plgr
depths fange+d from 26-feet to 67-feet, and the piers reaahed a minimum InsGallatian
pressure of�I00 psi (spedfled on ihe ptans)or urrtll IEEt#�egan to occur.
PQtlHDA710N IJFI'
't'ha tatget ittt for the nor#h side of#he buliding was S�Inal�es. Hovw�rer,after Instaliing the
plers, #he north wati c4wld not be Iifted more#han about 3,12-inch. On May 15, 2018, 1
vlslted th�stke�nd�de severai suggesdons to achleve the Ifft. These Induded addltlanai
excavei�ons#o remave soll from th+e etclsUng f,�otings and Instsliing addltlonai�ers on the
foo#Ings. Th�attached plan �eser�ta the fin�ed elevatlons, whlch show that the back
weif Is between 5-Inches and 6-Inches iower #han #he middie of th� bullding, ov+� a
Iwrlmn#ai distance ot abaut 64�feet
30640 Nristin Cau�t Radiands.CA 92373-90&3$$-7318-Fax 9q93$&7325-www.helfrich-associates.�m
Ve�a 1 tld5
147q Yslley Yteta Orke
Diamond Bat,GA
HEuca�.�aio��rrstau.anar�s
7w8lve hellcal an+churs were MnstaNed at tfie tocatlons shown on the attach plan. The
Installed IeegMs of the anchars were onry fr#eet (plans caitsd for 32 f }, but the
iastallatfan latque ranged irom 4050 it-Ibs to �300 ft-Ibs. THe soNs were igniflt:antry
stronge►than e�ected and wauld not ailaw the hellcai anehars to advance to the planned
depths.
�WNS
Based on our Inspec#loas and review af the inst�allaUon reoords, the under InMng was
pet�orrt�! in genera! �cardance wlth the InterK ai!he approved repair pIa , Atthaugh
#he expected balidfng Ilft was not achfieved, #t Is my apinion that the bulldi g has heen
stabilfzed agalnst futura mowement caused by siope movemeM and fll!setN me�rt. Ths
IMerlar iloors af the bullding can tue leveled cosmeticaity.
I app��Iate the oppartuntty to aseis�t you in this matter. Fqesse cail tf yoa ha e�mt
questto�a
very nury you►s, �EESSI(�
HeFhich-Associatss,tne. �4Q` � ��,dF SS/p�y,,�
��'�w��� ��r�y ��m ���'v�� ����c}
r� c� �
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��ox ca��F°��,�,J18 �'`�°� uF°�
&teven C.Hetfrlch,P.E.,G.E. f
Enclosed: Inspectfqn reparts(Maroh 5,2018 and May 23,2018}
Flnal flcor elevatlons
3Q84014f�n Couet.Redlande.CA 92379-90938&7318-�aM 90938a78z8-wwvr.hettr arm
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