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STATE OF CALIFORNIA—HEALTH AND WELFARE AGENCY GEORGE DEUKMFJIAN, Governor DEPARTMENT OF HEALTH SERVICES TOXIC SUBSTANCES CONTROL DIVISION REGION I 4250 POWER INN ROAD ATTACHMENT A SACRAMENTO,CA 95826 (916)739-3145 CLOSURE CONDITIONS Forward, Inc. September 13, 1988 1 The facility must submit a revised Sampling and Analysis Plan, within thirty (30) calendar days of Closure Plan approval, which lists the new sampling team, equipment, handling techniques, and certified laboratory. This revised Plan, in addition to those parameters included in the Closure Plan Reports dated September 1987, and April 1988, must include for analysis the following parameters: • Silver • Endrin • Lindane • Methoxychlor • Toxaphene • 2,4-D • 2,4-5 TP Silvex 2 . Monthly groundwater contour maps must be constructed. These contour maps must have the waste management units illustrated for reference. If for any month, a contour map shows influence from sources other than those discussed in the Response to Notice of Deficiency (RNOD) , April 1988, a report must be submitted to identify and discuss possible sources within 45 days after identification. If a vertical differential head greater than 0.25 feet is found at paired wells on-site, a report must be submitted within 45 days that includes revised flow nets and a detailed discussion of the possible causes for the differential head. 3 . A workplan must be submitted to the Department of Health Services (DHS) for review, within 60 calendar days of Closure Plan approval, that describes how the following tasks will be accomplished: a) Definition of aquifer characteristics and degree of interconnection between the lower and upper zones of the uppermost aquifer. b) Replacement of wells that do not provide acceptable samples and measurements throughout the year.