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i <br /> SSB Envirronmsntsl <br /> Consultants, Inc. <br /> 5740 East Shields Avenue. Suite 103 Fresno, CA 93727 (209)292.5736 <br /> May 22, 1991 <br /> Mr. Mike Infurna <br /> SAN JOAQUIN COUNTY <br /> Environmental Health Division <br /> 445 N. San Joaquin Street <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> Re: Thrifty Oil Company, Station Number 172 <br /> 7647 Pacific Avenue <br /> Stockton, California <br /> SSB 91-1038 <br /> Dear Mr. Infurna: <br /> We have prepared this letter to provide information to your office in order that our firm may <br /> obtain a special permit to conduct a subsurface investigation at the subject property on May 23, <br /> 1991. <br /> Proposed locations for two of the four monitoring wells to be installed lie ithin 50 feet f <br /> existing sewer lines. We are aware that ground-water samples obtained from these wells are <br /> required to be analyzed for fecal-coliform. We also recognize that these samples need to be <br /> analyzed within 24 hours of collection. <br /> In order to protect the health of individuals involved, precautions will be taken if discolored soil <br /> is encountered, if sewage odors are noted, or If PID readings taken at chest level above either <br /> boring exceed 50 parts per million during drilling of the two wells, If any one of the three <br /> conditions are encountered, operations will be stopped and appropriate safety gear will he <br /> donned. In addition to standard issue (level D -chemical resistant boots, hard hat, safety glasses, <br /> tyvek or cloth coveralls, long sleeve shirts), this would include half-face respirators fitted with <br /> organic vapor/dust cartridges. <br /> A updated site plan showing all sewer lines, proposed well locations, with 50 foot radii drawn <br /> around the wells, is enclosed, <br /> If you have any questions, please contact our office. <br /> Yours faithfully, <br /> $c ' ENVIRONMENTAL CONSULTANTS, INC <br /> gale S. Stanton <br /> Principal <br />