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K <br />KJ E LD S E N <br />Stephen K. Sinnock, P.E. <br />S <br />S I N N D C K <br />Christopher H. Neudeck, P.E. <br />IV <br />N E U D E C K <br />Neal T. Colwell, P.E. <br />Barry O'Regan, P.E. <br />inn. <br />CIVIL ENGINEERS & LAND SURVEYORS <br />2483-0020 <br />03-003 <br />May 23, 2025 <br />James Witty, MS, CPSS <br />Senior Soil Specialist <br />Stantec Consulting Services <br />2999 Oak Road, Suite 800 <br />Walnut Creek, CA 95206 <br />Re: Lower San Joaquin River GDR and GBODR <br />Phase D - Calaveras River Left Bank Utility Potholing <br />Monument Preservation Plan <br />Dear James, <br />This transmittal summarizes KSN's results of the monument preservation plan prepared for Stantec's proposed <br />Utility Potholes along the Left Bank of the Calaveras River. <br />Background and Understanding <br />The following details KSN's background and understanding of the project. <br />• The proposed project will require utility pothole investigations at two locations. <br />• All potholes will take place within the traveled way or shoulder of existing streets. <br />• As a condition of issuing an encroachment permit for the potholing, San Joaquin County and/or City of <br />Stockton are requesting a monument preservation plan, to safeguard existing survey monuments of <br />record at each pothole location. This plan shall be sufficient for both entities, San Joaquin County and/or <br />City of Stockton. <br />• When there is a potential conflict between a proposed pothole location and the location of an existing <br />survey monument of record, the proposed pothole location shall be moved, to safeguard and not disturb <br />existing survey monuments of record. <br />• Completion or submittal of County and/or City monument acknowledgement forms is not included or <br />anticipated. <br />Record Map Research and Field Surveys <br />Based on KSN's background and understanding, a pre -utility pothole exploration survey was performed to identify <br />the location of existing survey monuments of record in relation to proposed pothole locations. Below is a more <br />detailed description of KSN's services. <br />• Records Research: KSN researched available San Joaquin County Final Maps, Parcel Maps, and Record of <br />Surveys within the project area to determine search locations of existing monuments of record that have <br />the potential to be impacted by the project. This included searching the San Joaquin County Web -Based <br />Records Retrieval and Viewing System for maps within the project area. An online search for Corner <br />Records was also performed, and no Corner Records were identified in the County's online system within <br />the project area. <br />Corporate Office: 711 N Pershing Avenue I Stockton. CA 95203 1 209-946-0268 1 www.ksninc.com <br />West Sacramento: 1550 Harbor Boulevard. Suite 212 1 West Sacramento, CA 95691 1916-403-5900 <br />