SITE INFORMATION AND CORRESPONDENCE

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Phase I Environmental Site Assessment 5.2.5 Sanborn Fire Insurance Maps EDR's search of available Sanborn maps revealed no Sanborn Fire Insurance Map coverage for the Site and nearby vicinity. 5.2.6 Orphan Summary Review of EDR's list of poorly located sites in the searched databases(Orphan Summary)revealed one additional agency listed site in the immediate Site area or within ASTM recommended approximate minimum search radii. The listed site is the adjacent WPCF which is included in the HAZNET database. The listing indicates the facility manifests hazardous wastes shipped from the site. No indications were observed during the Site visit,or reports received during interviews,or records reviewed that indicated the handling of the listed wastes has affected the soil or groundwater on the Site. 5.3 AGENCY AND OTHER DOCUMENT REVIEW Telephone interviews were conducted with the Client's representative,a representative of the property owner,and a representative of the San Joaquin County Agricultural Commissioner regarding the Site(see Section 7.0 of this report). No reports of hazardous materials incidents at the Site were received from the representatives based on their knowledge of the Site. Following observation of a monitoring well near the southern boundary of the Site,Carlton conducted research in the California Regional Water Quality Control Board's internet web site records and found the latest Waste Discharge Requirements and Master Reclamation Permit(WDRs)issued by the Regional Board for the WPCF. The WDRs include requirements for groundwater monitoring on and adjacent to the facility. Carlton requested information from the WPCF representatives regarding results of groundwater analysis conducted according to the WDRs. Representatives of the WPCF forwarded a copy of the February 2008 groundwater monitoring analysis results for the facility for review. Review of the data sheets indicates that 16 wells have been constructed on and in the general vicinity of the WPCF, and one of the monitoring wells is located near the southeastern corner of the Site property. The physical presence of the well should be taken into consideration when planning improvements and structure locations for the Site project. 5.4 HISTORICAL USE INFORMATION As described in Section 3.5 of this report,Carlton found that the property was used for agricultural purposes(row crops,pasture land)or open ground prior to its current uses. Following construction of the WPCF in the 1960s,the property was used for temporary stockpiling bio-solids/sludge removed from the WPCF ponds during a lining project in about 1989,and for temporary stockpiling of pond sediment in about 2003 during maintenance of the ponds north of the Site used for industrial food-processing waste water. The stockpiled materials were removed from the site following the improvements/maintenance. 5.4.1 Historical Map Review A review of historical Topographic Quadrangle maps from 1910(7.5'series,1:31680),1947(15'series, 1:50000),1952(7.5'series,1:24000),1968 photorevised 1952 map(7.5'series,1:24000),1978(7.5'series, 1:24000)and 1993(7.5'series,1:24000)was conducted for the Site. No structures or development are indicated on the maps up to the 1968 photorevised map where structures in the easternmost area of the WPCF are shown. More development including the wastewater ponds northwest of the treatment facility structures is indicated on the 1978 and 1993 maps. The NCPA power plant is not indicated on the most recent(1993)map. Copies of the maps are included in the Appendix of this report. Lodi Energy Center Property ESA 10 Carlton Project No.6300-01-08 June 2008 CARLTONM E n g i n e e r i n g I n c.