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Levels (ESLs)for Commercial/Industrial soil. VOC detections, other than naphthalene, in soil and <br /> groundwater did not exceed Tier 1 ESI-s. <br /> In their February 26, 2019 letter, the Central Valley Water Board requested additional assessment <br /> so that a Conceptual Site Model (CSM) can be prepared and the case can be evaluated for closure. <br /> Ninyo & Moore, on behalf of the JCC, submitted a work plan to address the Central Valley <br /> Water Board's requirements for additional site investigation on May 23, 2019. <br /> REQUESTED BORING LOCATION CHANGE <br /> It has come to the attention of the project team that three of the proposed boring locations are not <br /> feasible or are possibly dangerous. Due to these concerns, we recommend changing the locations <br /> of these borings. The new proposed boring locations are in the attached Figure 2, and our <br /> rationale for moving the borings is below. <br /> • Boring B-2 was found to be above the judge's underground parking lot and was moved <br /> approximately 20 feet to the north. <br /> • Boring B-5 was found to be above an 18-inch high pressure gas main, posing a serious health <br /> and safety concern. Consideration was given to the property next door; however, access has <br /> been denied twice by the owner of the property. The new location for this boring, <br /> approximately 200 feet east of the site, serves as a downgradient boring. <br /> • Boring B-7 was located in the egress of an emergency exit and a secured area associated <br /> with the Stockton Courthouse. This boring was moved approximately 20 feet to the south. <br /> Sincerely, <br /> NINYO & MOORE <br /> ,pNAL <br /> JACOB WILCOX <br /> I 0- No.9128 <br /> b & Exp:It W �r <br /> �9�OF CAS <br /> Jacob Wilcox, PG <br /> Senior Environmental Geologist <br /> JMW/KML <br /> Attachments: Figure 1 —Site Location <br /> Figure 2 —Site Plan <br /> Distribution: (1)Addressee (via GeoTracker) <br /> (2) Dale Frisby, JCC (via email) <br /> Ninyo&Moore 1 180 East Weber Avenue,Stockton,California 1403488001 I November 9,2020 2 <br />