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' Work Plan Page 2 <br /> Former Manna Pro Site <br /> Project No 207 3 <br /> August 16, 1999 <br />' 1.1 Site History <br />' The former Manna Pro facility was originally constructed in 1956 as a grain mill which <br /> processed animal feed products Two 10,000 gallon underground diesel tanks and two <br /> 5,000 gallon underground gasoline tanks and a single 10,000 gallon underground gasoline <br />' tank were formerly in use at the site These tanks were used to fuel vehicles operated at <br /> the facility The former tanks were located dust northeast of the main entrance to the <br /> Property from El Dorado Street <br />' In January 1990, as part of an environmental site assessment, WHF installed six soil <br /> borings near the tanks and soil samples were collected from the borings One soil <br />' sample, collected from 15 feet below grade, contained elevated levels of gasoline and <br /> diesel range hydrocarbons In July of 1990, Semco removed the tanks under contract to <br /> WHF and a total of 10 confirmation soil samples were collected beneath the tanks, one <br />' from each end of each tank Petroleum hydrocarbons were detected in soil samples from <br /> beneath 4 of the 5 tanks Based on the results of this initial soil sample analysis, several <br /> hundred yards of fuel impacted soil were excavated The excavation reached a total depth <br />' of about 15 feet <br /> In October of 1990, ERM West conducted additional work to characterize the lateral and <br /> vertical extent of the hydrocarbon contamination in the sub-surface This included <br /> installing 25 soil borings into groundwater of which, a total of 6 borings were later <br /> converted to groundwater monitoring wells Between 1993 and 1996, Groundwater <br /> Technology Inc (GTI) installed four additional monitoring wells, a combination <br /> groundwater/vapor extraction well and three observation wells These wells were used <br /> for the completion of groundwater pumping and vapor extraction pilot tests In 1996, <br />' GTI conducted a feasibility study which included pilot level field work to test several <br /> remedial options The GTI report concluded that a combination of vapor extraction and <br />' groundwater pumping offered the most attractive option for remediation of the gasoline <br /> plume at this site To date, a total of 10 groundwater monitoring wells, 3 observation <br /> wells, and one combination groundwater and vapor extraction well have been constructed <br /> on or near the Manna Pro site <br /> 1.2 Current Site Status <br /> Since 1996, the only work related to the remedial investigation at this site has consisted <br /> of quarterly groundwater monitoring In June of this year, Geo-Phase Environmental Inc <br /> was named as Manna Pro's environmental consultant Upon locating and examining the <br /> wells on the site, it was found that most well boxes and all caps and locks were in poor or <br /> non-functional condition Geo-Phase Environmental personnel subsequently removed the <br /> 2937 Venerrman Ave,#B240 Geo-Phase Environmental Inc Phone(209) 569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />