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0 <br /> Advanced <br /> GeoEnvironmental, Inc . <br /> 14 January 1999 <br /> AGE-NC Project No. 98-052' <br /> Ms. Letitia Briggs <br /> SAN JOAQUIN COUNTY PHS-EHD <br /> 304 East Weber Avenue, 3`d Floor <br /> Stockton, CA 95201 <br /> Subject: Underground Storage Tank Pre-abandonment Assessment <br /> Work Plan Addendum <br /> Stockton East Water District - Diesel UST <br /> 6767 East Main Street, Stockton, California <br /> Dear Ms. Briggs: <br /> At the request of the Stockton East Water District Advanced GeoEnvironmental, Inc. (Ad) has <br /> prepared the enclosed Work PIan Addendum for the Stockton East Water District - Diesel UST at <br /> 6767 East Main Street in Stockton, California. <br /> The Work Plan was prepared for the collection of soil samples from the underground storage tank <br /> {UST} area prior to abandonment of one 10,000-gallon diesel UST at the site. The Work Plan <br /> presents the proposed scope of work to advanced three soil borings to evaluate if an unauthorized <br /> release of petroleum has impacted the site. Two under the UST and one in the product line area. <br /> To mitigate utility interference, AGE proposes to advance three vertical soil boring around the <br /> 10,000-gallon diesel UST and two soil boring in the product line mid and end-areas. Soil samples <br /> will be collected at 10, 15 and 20 foot intervals below surface grade (bsg) around the UST and at 4 <br /> feet bsg in the line area. The sample will be analyzed in accordance with the approved Work Plan. <br /> Upon PHS-£HD approval of the work plan and issuance of the soil boring permit, AGE will <br /> schedule field operations. If you have any questions or require further information, please contact <br /> our office at (209) 467-1006. <br /> S incerely, <br /> Advanced GeoEnvironmental, Inc. <br /> William Little <br /> Project Geologist <br /> cc: Mr. John Yosh'7,u,Ya <br /> < < � N«rth Wilson Way. Stock-ton- Cali surniu 952_[)5 <br />