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i Aldvanced . cs r 22 February 2007. AGE-NC Project No. 97-0290 Ms. Lori Duncan SAN JOAQUIN,COUNTY ENVIRONMENTAL HEALTH DEPARTMENT 304 East Weber Avenue, Third Floor Stockton, CA 95201 Subject: Remediation Well and Monitoring Well Abandonment Work Plan Addendum LODI THEATER PROJECT 107 North School Street',Lodi;California Dear Ms. Duncan: At the request of your office,Advanced GeoEnvironmental,Inc. (AGE)has prepared the enclosed work plan addendum for the abandonment of seven ground water monitoring wells.and multiple remediation wells and piping at 107 North'School-Street, Lodi;;California. The location of the site is illustrated on Figure J. A plan of the site.is illustrated on Figure 2 and a remediation plan is illustrated on Figure 3. Table 1 provides the wells.constructiondetails. AGE has calculated the volume of the soil vapor extraction wells, SVE piping connections and the air-sparge wells and IAS piping connections, along�with the cumulative volume each well cluster to provide a target volume:for grout backfilling,46 fully abandoned the wells at the site. Table 2 provides the grout volumeaargets for the destructions of wells and network pipe volumes. i AGE proposes to abandon all wells. via .pressure-grouting. Off-site monitoring wells will be pressure-grouted in a "traditional" manner and the remediation wells will be grout from the` remediation piping terminations.Table 2 provides the well target volumes for each designated well cluster. For the remediation wells and horizontal remediation piping,grout will be pumped via the horizontal piping at the manifold. Pressure.(10-20 psi) will,be applied to the entire system for at least five minutes to ensure grout penetration into.eacli well filter pack.A minimum.target volumes.of grout, for each piping cluster will be installed into piping terminations to satisfy the well.abandonment requirements.If necessary,additional grout will be pumped through thernanifold after a short period of"stabilization". Advanced GeoEnvironmental,Inc. 8`1 'Shgw R(xad `iivckion,Giliftrnia 95215 TeleP11(')T1e(209)467-1.00 F'ax-(24 9)467-11.18