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T K z S E C 0 R Conceptual Site Model March 24, 2004 M Page 16 In December of 1997, SECOR installed three cone penetrometer borings (CPT) (CPT-01 through CPT-03) to evaluate stratigraphy and hydrogeologlc characteristics of site soils and to collect depth discrete soil and groundwater samples Based on decreasing benzene concentrations with depth, as reported in the March 9, 1998 Results of Cone Penetrometer Testing (CPT) Survey, Former San Francisco French Bread Company Facility SECOR reported that vertical migration of contaminants did not extend past the depths explored in the investigation Excerpts from the Colombo/Toscana Bakery reports are presented in Appendix L 6 6 Former Dolly Madison Bakery a, g 661 Site Description i The site is currently an abandoned warehouse located to the south of the intersection of West Charter Way and South Lincoln Street and directly south of the former Colombo/Toscana Bakery The site was a former Dolly Madison Bakery Historical records indicate that sub-surface facilities consisted of one UST A 1,000 gallon USTs were removed on July 29, 1988 Based on a review of h available documents during a file review conducted by SECOR, the date the USTs were installed could not be determined 6 6 2 Remedial Activities In February of 1997 a vapor extraction well (VW-1) was advanced to a depth of 26 feet bgs The 4 vapor extraction well was screened from approximately 16 feet bgs to 26 feet bgs Based on a N review of available documents during a file review conducted by SECOR, operation of a soil vapor extraction system could not be determined 6,6 3 Historical Report Summary In February 1997, EMCON supervised the completion of three sod borings at the former Dolly Madison Bakery One soil boring was converted to a vapor extraction well (VW-1) and two borings were converted to groundwater monitoring wells (MW-1 and MW-2) The purpose of the soil borings was to evaluate residual hydrocarbon impact to soil near the former UST and to evaluate dissolved hydrocarbons in groundwater beneath the site Soil analytical results indicated higher residual e9 hydrocarbon detections located in the area of the former USTs Hydrocarbons were not detected in samples collected from the vadose zone, however, hydrocarbons were detected in the saturated groundwater zone in MW-1 and MW-2 TPHg and BTEX were reported at concentrations of 18,000 pg/L, 4,400 pg/L, 280 pg/L, 890 pg/L, and 1,200 pg/L, respectively in the groundwater samples collected from MW-1 TPHg and BTEX were reported at concentrations of 220 pg/L, 33 pg/L, 1 1 } pg/L, 2 5 pg/L, and 2 3 pg/L, respectively in MW-2 EMCON reported that lateral and vertical extent of contamination to groundwater could not be defined These activities are summarized in EMCON's August 4, 1997 Subsurface Soil and Groundwater Investigation Report In May 2000, Stratus supervised the completion of two CPT borings to classify Ilthology and four direct push borings to collect depth discrete soil and groundwater samples adjacent to the CPT borings to approximately 120 feet bgs CPT borings CPT-I/13-4 and CPT-2/B-5 were advanced in the vicinity of the former UST TPHg was detected in sod at concentrations ranging from 1 0 mg/kg I IChevron1920331REPORTSICSMICSM 92033 (REV B) doc