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ufN <br /> PUBLIC HEALTH SEVICES <br /> SA:v JOAQLI\C01:NTY <br /> JOG] KHANNA IAL MT H <br /> Htalrli Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 r F o a <br /> (209)468-3400 <br /> _OCT 21 1991 r` <br /> CLINT ROGERS <br /> P O SOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron ,#9-6465 IN REPLY REFER TO SITE CODE: 1786123 <br /> 5608 N. Pershing Ave. <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) , has reviewed the Quarterly Report dated <br /> September 3 , 1991, submitted by Alton Geoscience and has the <br /> following comments. <br /> Monitoring on a quarterly basis of all monitoring wells should <br /> continue at this time. <br /> In 1986, prompted by the gross loss of petroleum from the product <br /> lines at this station, three monitoring wells were drilled to <br /> assess the extent of contamination. During the drilling of those <br /> original monitoring wells, odors were observed by the attending <br /> field personnel. The soil samples taken at that time were not <br /> analyzed. Unless shown otherwise, it must be assumed that the soil <br /> in the area of those three soil borings is contaminated. <br /> When the underground tanks were removed in August of 1988, soil <br /> samples under the tanks and under the product lines also revealed <br /> contaminated soil. <br /> The soil contamination has impacted the groundwater beneath the <br /> site and, unless remediated, it will continue to do so. <br /> Therefore, a Corrective Action Plan (or Final Remedial Plan) is <br /> being requested of Chevron for this site. <br /> The corrective action plan should include a feasibility study to <br /> evaluate alternatives for remedying or mitigating the actual and/or <br /> potential adverse effects of the contamination. Three alternatives <br /> should be proposed, one of which can be no action. Discussion of <br /> the efficiency and cost-effectiveness of each alternative to <br /> restore or protect the groundwater beneath the site should be <br /> included. Documentation to support the claims and justify the <br /> assumptions put forth in the discussion is imperative and must be <br /> included. <br /> A Dl%lsion of San)oaquin County Hcalth fare 5cn,iccs 7 <br />