SITE INFORMATION AND CORRESPONDENCE

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PUBLYC HEALTH SERVICES SAN JOAQUIN COUNTY .� ENVIRONMENTAL HEALTH DIVISION W < Karen Furst, M.D., M.P.H., Health Officer 304 East Weber Avenue, Third Floor• Stockton, CA 95 AURTHUR S. BARBOUR 209/468-3420 ° VICE PRESIDENT C)) WELLS FARGO BANK CORPORATE PROPERTIES GROUP JAN 2 01998 111 SUTTER STREET,22ND FLOOR SAN FRANSISCO CA 94163 RE: WELLS FARGO BANK PROPERTY SITE CODE: 506077 49 SOUTH WILSON WAY STOCKTON CA San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has reviewed the December 1997 Additional Phase II Subsurface Investigation Report prepared by Building Analytics. PHS/EHD provides the following comments and directives. Data available to date suggests that petroleum hydrocarbon distribution at this site is limited to the South Eastern corner of the parcel, however, the vertical and lateral extent (three-dimensional) of contaminant distribution in both soil and groundwater are currently undefined and must be addressed in the next scope of work adhering to the directives provided below. This letter presents a directive to complete the definition of soil and groundwater contamination by fuel hydrocarbon constituents. PHS/EHD has obtained historic photos of the above referenced site circa 1950 which clearly shows the facility and fuel dispensers near the South Eastern corner of the parcel. The location of the tank(s) are currently unknown. A photo copy of the enlarged and cropped print from the upper left hand corner of the original negative is enclosed with a record identification reference sheet in the event you or your consultant would like to order a similar photo of higher quality than this photo copy. Copies may be obtained from the Bank of Stockton Archives Office, the contact person is Leslie Crow at (209) 941-1575. This photo should be evaluated against Sanborn Fire Insurance Maps and other available data to better evaluate the site which we understand your consultant has in their possession. This data comparison may allow all parties involved to better predict contaminant source locations and resolve site characterization problems more efficiently thereby allowing the site to achieve case closure more rapidly. Additional boreholes shall be distributed at this site. Groundwater flow direction is reported as North / North-East. Given the documented groundwater contamination at this site in the South-Eastern area of this parcel, additional ground water sampling down gradient (North-East) is required. At least one borehole shall be a continuous core. These boreholes shall be employed to further define any plume which may have originated from the former use practices at this site. The responsible party shall submit a workplan to this agency which when implemented will fully define the vertical and lateral distribution of hydrocarbons at this site. The workplan shall consider historic low and high groundwater elevations in the definition of the vertical aspect of contaminant distribution at this site. Consideration of operational periods for this facility shall be employed when evaluating historic ground water elevations. Any wells installed and surveyed shall be referenced to an appropriate and designated bench mark. Well screen intervals shall not exceed 20' in total length. The responsible party at this site is directed to include analyses of selected soil and all groundwater samples for TPH as gasoline, BTEX, by EPA Method 8015 and 8020. oxygenates and blending agents employing EPA Method 8260 (TAME, DIPE, MTBE, ETBE and TBA) until further written notice from this office. These analyses are required as a result of the potential for soil and ground water plumes to be commingled from sources at this site, 101 and 102 South Wilson Way in Stockton. Selected soil samples shall include at a minimum the historic low and high groundwater elevation I A Division of San Joaquin County Health Care Services