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MMAGE HECEN�Y"Eu,, ENV IRON MENTAL,INC. ENVIRONMENT! HEAGH 465 S.Meadows Pkwy,Ste.20 PMB 157 PERMIT/SERVICES Reno, NV 89521 Tel (775)851-7239 Fax(775) 851-7240 November 15, 2006 Ms. Vicki McCartney VIA FACSIMILE AND REGULAR MAIL San Joaquin County EHD 304 East Weber Avenue, Third Floor Stockton, CA 95202 Re: Request for Work Plan Variance San Joaquin County Courthouse, 222 E. Weber Avenue, Stockton EHD Site Code: 1285, USTCF Claim 415630 Dear Ms. McCartney: It was a pleasure to speak with you yesterday regarding proposed modifications to an approved work plan for the above-referenced project. As you requested, this correspondence outlines proposed changes to Ramage Environmental's Revised Work Plan..., dated August 4, 2006. San Joaquin County EHD approved the revised work plan on September 18, 2006. Ramage Environmental proposes to collect soil and groundwater-grab samples from three on-site locations using a direct-push drilling rig instead of a hollow-stem auger drilling rig. The direct-push rig has a lower overhead clearance, which will allow better access to drilling locations near overhanging tree limbs. A secondary advantage of direct-push drilling is the minimization of drill cuttings and waste soil storage and disposal. Besides the drilling method change, Ramage Environmental does not propose to significantly modify the approved scope of work. Soil and groundwater-grab samples will be collected at three previously-approved on-site locations (see enclosed map). Two of the soil borings are located in a sub grade parking area, and will be advanced to a depth of approximately 25 feet below the sub grade. The third soil boring is located in a street grade asphalt parking area and will be advanced to a depth of approximately 35 feet below street grade. A C-57 licensed drilling contractor will drill the two-inch diameter soil borings with a direct- push drilling rig. At four-foot intervals during drilling, the driller will collect continuous cores into two-inch diameter, clear, polyvinyl chloride (PVC) sleeves. A field geologist will log the continuous cores for hydrogeologic and lithologic characteristics according to the Unified Soil Classification System and screen each sample for organic vapors using a photoionization detector(PID).