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u Mr. Steve Sasson Village West Workplan Addendum 11 June 14, 1995 Based on these premises, the SJCEHD has required that a monitoring well (proposed MW-7) be completed north of MW-6 and that a well be completed to the east of the backfilled tank pit (proposed MW-8). Hydropunch ground-water samples will be collected and rushed to the assigned laboratory for analysis. Monitoring wells will be completed only if and when the HydropunchT" samples exhibit nondetectable" laboratory results for gasoline analytes. W.W. Irwin Inc. has been authorized to complete the subsurface investigation and prepare the Problem Assessment Report describing the ultimate lateral characterization of the plume. Recommended remediation alternatives will follow in a specially-prepared Remedial Action Plan. This MonitoringWell Installation Workplan Addendum II which describes the proposed location of the new wells, as well as field methodologies, is included for your review and approval. Additionally, a timeline is included that illustrates the proposed length of time we require to complete the remaining corrective action activities based on information that is currently available. Proposed Work W.W. Irwin, Inc. proposes to drill at least three (3) exploratory soil borings to an approximated total depth of 35-40 feet bsg. The soil and ground water will be sampled in order to identify the presence or lack of gasoline analytes which may have migrated after leakage by the two, steel, 10,000-gallon capacity USTs and one, steel, 5,000-gallon capacity UST. Diesel has never been detected in any analyzed ground-water sample through December 15, 1994, so TRPH-d analyses should not be required. V Ground-water samples will first be collected utilizing the Hydropunch" II method. If a sample is revealed "clean" by fast-turnaround laboratory analysis, a monitoring well will be completed in that boring. Two HydropunchesTm will be completed as 2-inch diameter monitoring wells MW-7 and MW-8. HP-7/MW-7 is to be completed just east of on-site well MW-6 if street space permits. If the sample from HP-8/MW-8 (located in the "Entrance") is found impacted, a step-out boring will be drilled and sampled approximately 40 feet outbound to the east. An additional HydropunchT1 boring will be sampled on the north side of the planter island (proposed HP-4), and another (proposed HP-5) will be sampled north of MW-6. At this writing, neither are expected to be completed as monitoring wells. This work is ultimately expected to define the northern and eastern limits of the ground-water plume, completing definition. Mitchell Drilling & Environmental Company (MD&E) (C-57 License No. 672617) of Rancho Cordova, California has been selected to drill the borings, collect soil samples, and complete the monitoring wells. Should the SJCEHD require additional or updated proof-of-insurance or other pertinent information from MD&E, please contact Ed Mitchell, Jr. at (916) 852-9558. V 2 V