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• The PHS/EHD submitted a letter dated August 12, 1993 to the property owner requiring a workplan to implement soil remediation and construct additional groundwater monitoring wells to define the extent of groundwater contamination at the site A follow up letter to the PHS/EHD was submitted by Ms Brooke Birkie of Neumiller & Beardslee dated August 23, 1993 Ms. Birkie explained that additional groundwater monitoring events would be necessary prior to considering remedial options for the groundwater, but that a workplan to define the extent of the impacted soil and review soil remedial options would be prepared and submitted to PHS/EHD In September 1993, McLaren/Hart submitted a workplan to PHS/EHD to conduct additional soil investigation, prepare a feasibility study and perform a soil vapor extraction pilot test for the Site. The workplan was approved and the results of the field investigations are presented in Section 3 A short term vapor extraction pilot test was performed in October 1993 to evaluate the feasibility of soil vapor extraction as a remedial option for the vadose zone soils at the Site Test results for extraction/monitoring (the five existing monitoring wells) indicated that a multiple-point vapor extraction system is a potentially feasible remedial technology for the impacted soils A summary of the results for the soil vapor extraction pilot test is presented in Appendix III 2.0 SITE CHARACTERISTICS 2.1 Site Location The Site is located near the northwest corner of the intersection of Pershing Avenue and Rose Mane Lane in Stockton, California. Land use in the immediate area of the Site is retail businesses and residential The subject property is bordered to the east by a veterinary hospital, to the south by a car wash, to the north by the Venetian Square Shopping Center, and to the west by retail businesses A 7-11 convenience store which dispenses gasoline is located approximately 100 feet to the east of the subject property, at the northwest corner of the intersection of Rose Mane Lane and North Pershing Avenue, a Shell service station is located approximately 150 feet southeast of the subject property, at the southwest corner of the intersection of Rose Mane Lane and North Pershing Avenue; and an Exxon service station was previously located approximately 200 feet to the southeast of the subject property, at the southeast corner of the intersection of Rose Mane Lane and North Pershing Avenue 2.2 Site Lithology The Site is underlain by low permeability silty clays and clayey silts to approximately 20 feet below grade The silty clays and clayey silts are underlain by moderately permeable sandy silts to approximately 26 feet below grade throughout the Site Interbeds of permeable silty sands, sandy silts and sands extend from beneath the moderately permeable sandy silts to the maximum explored depth of 45 feet below grade The sands encountered at the Site are predominately fine sands i i iolcd3 8