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ekienvironment & water Table 4. Spring Hydraulic Gradients and Azimuth in the Vicinity of Selected Monitoring Wells Land 2022 Fall Event 2023 Spring Event Change Develop- Well/Site (Second Semiannual) (First Semiannual) ment Magni- Azimuth Magni- Azimuth Magni- Area tude (degrees)a tude (degrees)a tude Degree sa Mossdale MWM-12/ LAA A23 0.0003 345 0.0016 260 0.0013 -85 CLSP LAA A36 0.0004 0 0.0007 150 0.0004 150 MBRMW-1/ Pond S5 0.0008 290 0.0006 295 -0.0001 5 KM W-4/ CTF 1313-1 0.0004 280 0.0034 315 0.0030 35 KMW-10/ Former LAS-2 0.0008 250 0.0016 230 0.0008 -20 MWR-24/ LAA A28 0.0006 50 0.0032 45 0.0026 -5 River MWR-28/ NA NA NA NA NA NA Islands LAA A30b MWR-32/ LAA A31 1 0.0018 1 100 1 0.0014 110 1 -0.0004 110 Abbreviations: CTF=Consolidated Treatment Facility CLSP=Central Lathrop Specific Plan LAA= Land Application Area NA=not available Notes: (a) Degrees rounded to the nearest five(5)degrees. (b) MWR-12 was dry during the 2023 Spring monitoring event; therefore, no gradient was calculated within the vicinity of LAA A30. In Mossdale, water levels in monitoring wells increased by about 3.46 feet on average between Fall 2022 and Spring 2023 (Table 3). The water levels in all wells were below the maximum San Joaquin River stage' at the time of the Spring 2023 monitoring event. In northern Mossdale, inferred groundwater flow is away from the San Joaquin River towards well MWM-23 (Figure 3), which is like inferred flow directions in previous monitoring events. In central Mossdale, inferred groundwater flow is generally towards an area of low groundwater elevation near wells MWM- 17 and MWM-11 (Figure 3) and is generally consistent with the inferred groundwater flow direction in most previous monitoring events. In southern Mossdale, inferred groundwater flow is generally to the east away from the river and is consistent with previous monitoring events (Figure 3). 9 San Joaquin River stage data recorded at the Mossdale Bridge(MSD)between 3/24/2023 through 4/5/2023 ranged from 19.39 to 20.48 feet above mean sea level and averaged 20.06 feet above mean sea level. https://cdec.water.ca.gov/dynamicapp/selectQuery?Stations=MSD&SensorNums=1&dur code=E&End=2023-4- 7&span=350hours City of Lathrop 9 13 July 2023 EKI B90088.03