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Mar 15 01 11: 28a San Joaquin Counttj 4683127 P. 1 [hur&day,Nlasc`15,2001 7 u ANI .".ire e v..;{ ^S'��."�1 0 p 01 J nE-jDC�DWED MAR 15 2001 OAKWOOD LAKE WATER DIS T RiCT EastENVIRONMENT HEALTH $7 Manteca, CaA 95337oad PERMIPSERVICES March 15,2001 Chandler Martin San Joaquin County Community Development Department 1810 E_ Hazelton Ave. Stockton, CA 95205-6232 Re: QX-00-1Landrnark Dear Chandler, I have reviewed this application along with the comments of the Regional Water Quality Control Board and the San Joaquin County Health Department,which I did not see before the deadline for comment submittal. I respectfully request that this item be removed from the consent calendar in order that the taltnwing comments can be submitted for the consideration of the Planning Commission. This project has the pat -itial to impar, groundwater in Oakwood Lake. The application states that the project is relying on the groundwater gradient provided by the Oakwood Lake Water District pumps,which maintain the water level in Oakwood Lake at an artificially low level(Landmark Surface Mining Application, p_2).This is correct, as evidenced by the groundwater gradients shown in the application, and a groundwater gradient model prepared for the District by Condor Earth Technologies(copy attached). However,these gradients fluctuate on the Landmark property during periods of high water in the river_ I have personalty observed the water table rising to the ground surface near the site during periods of high N%mter in the San Joaquin Rimer. The application itself states that excavation of the quarry to depths of 11 ft and 14-ft will not be aWve the groundwater table in perpetuity after reclamation-Groundwater depths are shogun to be closer to 'I O-ft below ground level, and"an accurate measurement of the groundwater depth was not possible. Ground water depths can and Will fluctuate seasonally"(Soil and Mineral Classification, Neil O. Anderson&Associates, TABLE 1, SUMMARY OF GROUND WATER DEPTH INFORMATION p. 2 and p_4, respectively). Clearly, more information is needed in order to insure that the excavation does not enter the groundwater table, and that there are no impacts to groundwater flouring into Oakwood lake. Declines in groundwater quality have the potential to negatively affect Oakwood Lake's NPOES permit compliance Specifically, application of fertilizers and herbicides on crops on reclaimed lands so close to the varater table without adequate separation could cause residuals to enter the lake.This would be a significant impact. It should be assumed that the excavation will in fact enter the groundwater table, and a pffmit from ttte R ionalafar ualit Control Board should be a condition of the woiect. Mitigation measures should be specified to protect ground water in the area.