3206 WAVE DR 2016-01-01 MF Import

�� eoT�sr ,., �.,:,,,,,. �,,,:. fl.-Ilniyli:nn.VCL�icl2S 3Vi"I'.°. 7:i:F Hf:U7S1 L21�� i�73:• �.:1a �� �d�� June 3, 2005 y« � 2g Job No. 5233 I `�rr��,7 � 1� 3� Larry Baldwin c, 3206 Wave Drive q"�' Everett, WA 96203 Atin.: Larry Baldwin Re: Allan Block Wall Replacement ,�bll U� �"GZ So Baldwin Residence 3206 Wave Drive Everett,WA 98203 Dear Mr. Baldwin: As requested, GeoTest Services, Inc. is pleased to submit this report summarizing our site observations, limited subsurface investigation and Allan Block retaining wali design for repla;.ement of the existing retaining wall located on your property. We understand that due to the observed settlement and potential for future failure of the existing wall, the City of Everett has made it mandatory that the existing tercaced wall system be replaced. The proposed wall replacement oi choice is a two-tiered wall within the same location. Each wall will be a maximum of 10 feet in height, with the upper wall set back a minimum of 12 feet irom the lower wali such lhat the upper wall will not significantly intluence the lower wall. Therefore, the two walls will act independently and one wall design can be used for bolh �vall �ocations. Our design was based on reuse of the existing blocks from the previous wali in the new wall construction. Project Description The subject property is located at 3206 Wave Drive in Everett, Washington, as shown on the Vicinity Map, Figure 1. The residence is located at the southeast corner of a dead end portion of the city street. The street then continues to the east of the property. Localed between the two dead end porlions of Wave Drive is a vacated street easement that is currently being used by the subjecl property and adjacent properties as a portion of their landscaped yard areas. Tiie subject modular block walls, which will be replaced, are localed at the northeasl corner of the property and partially within the vacated city street easement, Site and Exploration Plan, Figure 2. The subject walls lo be removed were constructed in a multipie tiered fashion with integrated steps leading from the upper parking area and dri�eway down to the dead end portion of Wave Drive located to the east of lhe subjecl property. Wail failure modes, such as diiferential setllemenl between various wall sections and leaning (overturning) of some of the sections were visible throughout the previousiy constructed wall system. The wall system was also not fully completed at the time of our visit. We undersland that the current wall system was not engineered and was constructed by private individuals. The walls were constructed wilh limited use of drainage material located behind the wall and geogrid soil reinforcement was not included within the soil backfi„ zones. Page 1 of 7 �, ��1 ,v�,,,��;,i��,:i�„�c�:•„