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e ti� <br /> Pgt!�N <br /> PUBLIC rIEALTH SER)ACES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 ' Stockton, CA 95201-0388 <br /> LlPO� <br /> 2091468-3420 r��/y <br /> MARC PASCHINI DISTRICT MANAGER <br /> CANTEEN CORPORATION MAILED � � ' �9°S <br /> 1500 SHAW RD <br /> STOCKTON CA 95205 <br /> RE: CANTEEN FACILITY SITE CODE. 1727 <br /> 1500 Shaw Road <br /> Stockton, CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has reviewed the "Work Plan for Installing Three Groundwater Monitoring Wells and <br /> Installation of Oxygen Releasing Compound in Two Monitoring Wells", as submitted by <br /> Applied Earth Sciences, Inc., on April 8, 1996, and has the following comments. <br /> The number of soil samples from each well that will be analyzed at the lab should be <br /> based on field evaluations and not limited by work plan proposals to only analyze "a <br /> maximum of three...per boring". It is highly recommended that PHS-EHD personnel on <br /> site at the time of drilling be consulted prior to determining the number of soil samples <br /> to be analyzed. <br /> The placement of the screened interval for the onsite replacement monitoring well <br /> should overlap the screened interval of MW-3. Please limit the bottom of the screened .� <br /> interval for the new well to no deeper than 67 feet below ground surface ('bgs). This <br /> should overlap MW-3's top of screen at 65' bgs by two feet. The total length of the new `/' <br /> well screened interval should not be more than 20 feet. <br /> �r _ ;U <br /> The minimum time to allow grout material to set is 24 hours. Please ensure that well 7 6 <br /> development does not occur before this minimum time period. <br /> The use of Oxygen Releasing Compound (ORC) in MW-2 and MW-3 may be <br /> approved after all three new wells are installed and sampled for initial dissolved <br /> oxygen and evaluated for the oxygen redox potential (DO and ORP). Low <br /> hydraulic gradient values (i.e., 0.0052 feet per foot) are prevalent at this site and <br /> adequate amounts of groundwater may not pass by these wells to effectively enhance <br /> the natural bio-degradation effects these ORC bags are designed to do. Monitoring <br /> points may be required at a later date. PHS-EHD will evaluate the ORC effectiveness <br /> after consistent and non-interrupted quarterly reports are submitted by your consultant <br /> and reviewed by PHS-EHD. <br /> A Division or San Joaquin County Eiealth Care Services <br />