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25 March 2009 AGE-NC Project No. 95-0121 Page 5 of 9 3 .6. INTERIM REMEDIATION MONITORING AND MAINTENANCE During the DPE start-up period (first week of operation), influent and effluent-vapor and influent, intermediate and effluent water samples will be collected on a daily basis and submitted for laboratory analysis ofrequired petroleum constituents to monitorhydrocarbon destruction efficiency, during this time, DPE operational parameters including depth to water measurements, soil-vapor concentrations, DPE flow, DPE vacuum and DPE total gallons (totalizer) will be monitored on a daily basis to gauge the optimal DPE performance and optimal destruction rate of recovered hydrocarbon vapors. Additionally, a lower explosive limit (LEL) monitoring device will be installed and calibrated to manufacturers specifications, before the outlet of the effluent water stream, as required by the City of Stockton District of Municipal Utilities. Following the DPE start-up period, influent and effluent vapor and influent, intermediate and effluent water samples will be collected on a monthly basis or as required by SJVAPCD and City of Stockton. DPE operational parameters will be monitored on a weekly basis (at a minimum) to monitor cleanup progress. 3 .7. REPORT PREPARATION Following the above referenced field activities, a report will be prepared detailing the system installation, start-up and first month of operation. Subsequent interim remediation reports will be submitted on a quarterly basis. The reports will be in a format acceptable to the SJCEHD and will be reviewed and signed by a California Professional Geologist. 4.0. FIELD PROCEDURES The proposed location of the DPE interim remediation system is adjacent to the southern wall of the site building in the portion of the site presently occupied by a road safety equipment sales and rental firm (Figure 4). The chosen system location allows the current tenants to conduct their day to day business with minimum interference from the 24-hour per day operation of the remediation system. The entire DPE remediation system will be placed on a concrete pad and secured by a chain-linked, gated enclosure approximately 30 feet wide, 35 feet long and seven feet high. Electrical service is available at the site, but the service will need to upgraded. A dedicated electrical meter is currently installed for direct connection to the DPE system. All field procedures will be under the supervision of California Professional Geologist. Procedures for ground water monitoring, underground piping installation, start-up period, DPE operation and maintenance procedures are described below. Advanced GcoEnvironmental, Inc.