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. the potentiometnc surface across the site, and to prepare a Groundwater Potentiometric Surface Map (Figure 4) The gradient calculation indicated that the groundwater surface was sloping S170E at approximately 0 0126(1 26 feet/100 feet) Groundwater elevations ranged between 14 38 and 15 88 feet below mean sea level on January 13, 1994 with a maximum difference in calculated groundwater elevations of 1 50 feet between MM2 and MW4 The calculations indicated the average slope and direction of flow for the groundwater surface at the time of the measurement Data collected during the groundwater monitonng event conducted by MKA on June 14, 1994 indicated that groundwater had nsen approximately 0 5 foot (Table 6) The June, 1994 groundwater gradient was in general the same as what we observed during the January, 1994 monitoring event, the direction was S 12°E and the slope was approximately 0 0110 (1 10 feet/100 feet) at the time of the measurements The maximum difference in calculated elevations for June 14, 1994 was 1 19 feet between MW2 and MW4 Note All of these data were reported to us verbally by telephone TABLE 6 GROUNDWATER ELEVATION DATA 1766 MONTE DIABLO AVENUE STOCKTON, CALIFORNIA {O�`k\},'xs}.��`'`,�oi'.'.otiV1;°i �:`}x�`��'j}~��.{'�`va. 4;}`�<�~' .a'x}`x,jti�`u`yy�'`oi�`#a�,�`.ro� '��4��`.t.:,.io o`'�:`�„'.�0�`"3 i~~C``'/� .`a tY}• 4i�� t\�ti✓1 'J�{r~J v`�t~`�~ ��i.\i��. �v� {Ori �Ji14{`r` �t�i `}T�V}y\i}itvl l4}t;.ti}`.V��F�.[+��Titi�J `'�~• Vim* .}}�tivv'�~'~{"fitk �;.�'JJ4l�+}i�yti�, v 1}}ry ,�4[ }`}?{`..�kt'^`t kiry"Z k {.v Y`k�'i�}ia.J`�i} `�`. t t ♦C 4J�}ti`: }iS+s}� uv.� .v,t4`•,k 4}. `4$"'`ik k a '3.j i�JtJJ �V�� St�tiii.vl N.t ii .J January 13, 1994 NM 631 2148 -15 17 MW2 5 65 2003 -1438 MW3 536 2085 -1549 MW4 672 2260 -1588 June 14, 1994 MW1 631 21 37 -1506 MW2 5 65 1954 -13 89 MW3 5 36 2030 -1494 MW4 672 2180 -1508 MSL =Mean sea level datum Elevations based on U S G S Benchmark Elevation w 304 96 SBACOR 014-01-1 par 11