SITE INFORMATION AND CORRESPONDENCE

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Biu_✓✓✓��u ✓ i�-ini iuiiu ftuJ r'Le 1'IHI 1J 70 1 -JJ • May 11, 1998 l 7LLPA Department of Toxic Substances Pete Wilson Control Governor Ms. Sheridan Randolph 10151 Croydan Way c/o Mr. John Hall, Esq. Peter M.Rooney Suite 3 Tnbin & Tobin Seeretaryfor Sacmmeeto, CA 500 Sansome Street, 8th Floor Environmental 95827-2106 San Francisco, CA 94111 Protection ACME GALVANIZING FACILITY, STOCKTON, CALIFORNIA- FTVE YEAR FVALUATTON UNDER ENFORCEABLE AGREEMENT NO. RSA 9491-012 Dear Ms. Randolph; The Department of'Toxic Substances Control (DTSC) has received and reviewed the October 1997 report submitted to report findings of the five-year review and re- evaluation performed in accordance with the August 4, 1997 workplan and in accordance with requirements of the subject agreement. The report is well-written and conclusions are well-supported. Based on information collected, it appears site contaminants (lead and zinc) remain stabilized under the asphalt cap with no contaminant migration detected below the stabilized material or in groundwater, From conclusions made in the report and from visual observations made by DTSC personnel during a site visit, it appears there has been some deterioration of the cap and of a groundwater monitoring well. The combined effects of a wet winter and the frequent operation of a forklift and other heavy equipment have resulted in the deterioration-of portions of the cap and of one of the three groundwater monitoring wells (MW-3). To continue the current site operation, the asphalt cap will require replacement to improve its effectiveness and the groundwater monitoring well must either be repaired or properly decommissioned if no longer needed. MW-3 is likely broken and has been partially filled with surface mud/debris runoff and is therefore no longer functional and may be serving as a conduit for future contamination of groundwater. The site operator has informed DTSC that they would like to replace the asphalt cap with a more permanent concrete cap this summer. This repair work is to be done as a follow-up to the five-year review and re-evaluation. Please submit within two weeks from receipt of this letter a work plan and schedule for replacement of the cap and repair or decommissioning of the groundwater monitoring well(s). Enclosed are general guidelines for decommissioning of groundwater monitoring wells. Additional guidelines may be applicable or required by the County.