SITE INFORMATION AND CORRESPONDENCE

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u u Subject: Meeting Notes of November 10, 2005 Date: 12/6/2005 Page 2 of 3 1) Measure the depth -to -water and total depth of all wells on a quarterly basis. (s') 3 2) Discontinue sampling well MW -3, since it is inclose proximity to well MW -13. rr t, ' ' 3) Discontinue sampling well MW -6, since it is more than 180 feet upgradient of the former = 2 tanks and contaminant source area. 4) Sampling well MW -10 on an annual basis (in July), since it is approximately 120 feet upgradient of the former tanks and contaminant source area. G A • During each sampling event, a duplicate groundwater sample will be collected from one well for quality assurance purposes. A travel blank will be prepared by the analytical laboratory and will accompany the groundwater samples. • The analytical requirements for groundwater samples will be TPH-gasoline, BTEX, diisopropyl ether (DIPE), and 1,2-dichloroethane (1,2 -DCA) by EPA Method 8260B. The samples will no longer be analyzed for the remaining oxygenates and additives (ETBE; MTBE, TAME, TBA, and ethylene dibromide). • The traffic boxes for some of the wells require repair or replacement. PSC and ETIC will - arrange for this work to be performed. • PSC and ETIC will arrange for a licensed land surveyor to survey the building, rainwater downspout, storm water catch basins, former tank area, pump island, separators, property line, wells, piezometers, and edge of concrete/asphalt pavement. • PSC will upload to Geotracker a .pdf file of a site map showing site features and well/boring/CPT locations. PSC will upload well coordinates and historical water levels to Geotracker. • Ms. McCartney and Mr. Henderson indicated that PSC and ETIC should evaluate the vertical distribution of contamination in the subsurface. This should be done to see whether the contamination is limited to low -permeability clay and silt layers or also in the more -permeable sand and/or gravel layers. PSC and ETIC will correlate analytical data with subsurface lithology to perform this evaluation. • Ms. McCartney and Mr. Henderson indicated that PSC and ETIC should develop a site conceptual model that describes the lateral and vertical extent of contamination, fate and transport of the residual contaminants, attenuation rates, and mass of residual contamination. PSC and ETIC will compile existing data and obtain additional data, if necessary, to complete the site conceptual model. l tte ;'rt rnd l ua >u )4)6 . B;- 1, v' r_. ��, 200, J y,7, W.7 it--; • PSC and ETIC will prepare a work plan to remove the two separators located near the former fueling island. The scope of work will include: 1) Obtaining necessary permits from the Fire Department and/or SJCEHD Hazardous Materials Division; 2) Removing a rectangular portion of the concrete pad from the building to the asphalt PSC' RNV IRONMENTAL SERVICES 210 We.,I Sand Bank Rood, Columbia, 11 62236 (618) 281 1543 800) 733-7173 Fax (618) 281 7020