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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION r. <br /> Q: <br /> w: < <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> BRETT HUNTER <br /> CHEVRON USA PRODUCTS COMPANY « i 1 1 196 <br /> PO BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: former Chevron Station #9-4054 SITE CODE: 1780 <br /> 2103 Country Club Blvd. <br /> Stockton, CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br /> has reviewed the recently submitted quarterly reports for the Third and Fourth Quarter <br /> of 1996 and has the following comments. <br /> Proposals for changes in the quarterly gauging and sampling requirements were <br /> included in the attached cover letter and requested approval from PHS-EHD. After <br /> evaluating your request, I have concluded that your proposal to reduce all gauging and <br /> sampling for seven of the twelve wells is unacceptable. Your proposal to "discontinue <br /> mapping the potentiometric surface" is also unacceptable. <br /> I agree that the groundwater contaminant plume is migrating. My concerns are to <br /> ensure that you quickly determine the rate and extent to which the plumes is moving. <br /> By not gauging or monitoring the wells known to be in the highest area of groundwater <br /> contamination, I feel that you will not obtain values needed to interpret the continuing <br /> release rate. PHS-EHD will allow the modification of the quarterly gauging and <br /> sampling rate in the following manner only: <br /> • monitoring wells 1, 4, 6, 7, and 9 are to be gauged and sampled <br /> twice annually (2nd and 4" quarters) and the report is to be <br /> submitted to PHS-EHD within sixty (60) days of the event. <br /> • monitoring wells 2, 3, 5, 8, 10, 11, and 12 are to be gauged and <br /> sampled annually during the 2nd quarter and the data is to be <br /> included in the report submitted for the semi-annual event. <br /> • all wells are to be sampled for Total Petroleum Hydrocarbons as <br /> Gasoline utilizing EPA Method 8015m at detection limits of 50 <br /> ug/I, Benzene-Toluene-Ethylbenzene-and-Xylene by EPA <br /> Method 8020 at detection limits of 0.5 ug/I, and MTBE by EPA <br /> A Division of San Joaquin County Health Care Services <br />