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JRN-26-99 11 :00 RM HENSHRW RSSUC• DUBLIN UH `JL5 :iOJ L'»> '• b� NA Henshaw Associates, Inc. Environmental Engineering Services January 26, 1999 Mr.Tran E. Forkas Water/Waste Water Superintendent City of Lodi Municipal Service Center Public Works Department 1331 South Ham Lane Lodi, California 95242 Reference: Review of Jim Thorpe Oil, Inc. Letter Plan for the Removal of the Two Underground Solvent Tanks from 226 South School Street in the City of Lodi, California; Henshaw Project No. 114.C.01 Dear Mr. Forkas: As you requested. we have reviewed the Jim Thorpe Oil, Inc. letter, dated January 25, 1999, regarding the proposed removal of the two 500 gallon Stoddard solvent tanks from 226 South School Street in the Lodi (City), California. The scope of work described in the letter appears to be in substantial conformance with the sampling requirements of Paragraph 4 of the Limited Monitoring and Information Order issued by the City on January 19, 1999,although Henshaw Associates, Inc. recommends the following additions to the sampling protocols; Selected soil samples will be field screened for volatile organic compound(VOC) concentrations as part of the City's oversight role. The field screening will be conducted using a portable field photoionization detector(PID) equipment to provide semi- quantitative screening data. Selected samples will be appropriately packaged and bandied for analysis. A uniform volume of sample from the adjacent 6-inch liner will be placed in a glass jar or plastic bag and scaled. F.ach container will have a hole slightly larger than the PID probe. After the container with the soil sample is shaken and allowed to stabilize for approximately 5 minutes, the PID probe will be inserted into the hole and the maximum reading detected will be noted for future reporting. Soil samples should be handled so as to minimize sample disturbance. Soil samples should be collected by advancing a brass liner into relatively undisturbed soil. The liner should be separated from the soil using a clean, flat tool such as a putty knife. Teflon sheets should be placed on both ends of the soil sample tubes selected for chemical analysis and a plastic cap should be scaled over each end of the tube. Laboratory analysis of each soil sample will be performed by a California-certified laboratory for total petroleum hydrocarbons as stoddard solvent by Modified EPA Method 8015 and VOCs including benzene, toluene, ethylbenzene, & xylenes (BTE&X)by EPA Method 8260. A (i�Fllci\I 11.Ciry 4r WC�G098.99.wpJ 11075 Dublin Boulevard, Suite A-200• Dublin, CA 94568 •Tel: 925/551.7272 Fax: 925/551-7464