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Ms. Margaret Lagorio San Joaquin County Public Health Services Environmental Health Division Post Office Box 2009 Stockton, California 95201 Dear Ms. Lagorio: 'Projeectt i2l3382/i 5997 Subject: Proposed Workplan Addendum For Groundwater Monitoring Well Installations Earth Grains/Rainbo Baking Company Facility 2651 South Airport Way Stockton, (San Joaquin County) California On behalf of the Rainbo Baling Company (Rainbo), Burlington Environmental Inc. (Burlington) is submitting this workplan addendum to install groundwater monitoring wells at the subject facility. The proposed monitoring wells will augment the current monitoring well network and replace some site wells that have been dry or intermittently dry due to recent drought conditions. Data from the new wells will delineate the extent of petroleum hydrocarbon - impacted groundwater at the facility, and provide information necessary for it's subsequent remediation. Site History Groundwater monitoring at the site has been performed since 1987 following the removal of two adjacent gasoline underground storage tanks (USTs) located near the southwest corner of the plant. Hydrocarbon leakage from one of the USTs was originally suggested in 1986 based on a failed tank integrity test. Environmental Sciences and Engineering (ESE) installed the initial monitoring well MW -1 in July 1987, and wells MW -2 and MW -3 in September 1987. Monitoring well MW -1 is screened from a depth of 31 to 76 feet. Wells MW -2 and MW -3 are screened from a depth of 22 to 55 feet. The depth to groundwater in these wells was reported to be about 35 to 36 feet in October 1987. Anderson Consulting Group (ACG) installed monitoring wells MW -4 and MW -5 in January 1988, MW -6 and MW -7 in February 1990, and MW -8 in September 1990. Monitoring wells MW -4 and MW -5 are screened from a depth of 23 to 53 feet, wells MW -6 and MW -7 are screened from 30 to 55 feet, and well MW -8 is screened from 35 to 60 feet. ACG submitted a Problem Assessment Report, dated December 19, 1991, to the San Joaquin County Environmental Health Division (SJCEHD) summarizing the results of Burlington Environmental Inc. ® P.O. Box 230 • 210 West Sand Ban.. • Columbia, IL 62236-0230 Phone 618/281-7173 • 301~4}/241-17 FAX 618/281-5120 f! Y.2i �rC quisfur.gIT:4 BURLINGTON `r3°'F5"`' ENVIRONMENTAL Ms. Margaret Lagorio San Joaquin County Public Health Services Environmental Health Division Post Office Box 2009 Stockton, California 95201 Dear Ms. Lagorio: 'Projeectt i2l3382/i 5997 Subject: Proposed Workplan Addendum For Groundwater Monitoring Well Installations Earth Grains/Rainbo Baking Company Facility 2651 South Airport Way Stockton, (San Joaquin County) California On behalf of the Rainbo Baling Company (Rainbo), Burlington Environmental Inc. (Burlington) is submitting this workplan addendum to install groundwater monitoring wells at the subject facility. The proposed monitoring wells will augment the current monitoring well network and replace some site wells that have been dry or intermittently dry due to recent drought conditions. Data from the new wells will delineate the extent of petroleum hydrocarbon - impacted groundwater at the facility, and provide information necessary for it's subsequent remediation. Site History Groundwater monitoring at the site has been performed since 1987 following the removal of two adjacent gasoline underground storage tanks (USTs) located near the southwest corner of the plant. Hydrocarbon leakage from one of the USTs was originally suggested in 1986 based on a failed tank integrity test. Environmental Sciences and Engineering (ESE) installed the initial monitoring well MW -1 in July 1987, and wells MW -2 and MW -3 in September 1987. Monitoring well MW -1 is screened from a depth of 31 to 76 feet. Wells MW -2 and MW -3 are screened from a depth of 22 to 55 feet. The depth to groundwater in these wells was reported to be about 35 to 36 feet in October 1987. Anderson Consulting Group (ACG) installed monitoring wells MW -4 and MW -5 in January 1988, MW -6 and MW -7 in February 1990, and MW -8 in September 1990. Monitoring wells MW -4 and MW -5 are screened from a depth of 23 to 53 feet, wells MW -6 and MW -7 are screened from 30 to 55 feet, and well MW -8 is screened from 35 to 60 feet. ACG submitted a Problem Assessment Report, dated December 19, 1991, to the San Joaquin County Environmental Health Division (SJCEHD) summarizing the results of Burlington Environmental Inc. ® P.O. Box 230 • 210 West Sand Ban.. • Columbia, IL 62236-0230 Phone 618/281-7173 • 301~4}/241-17 FAX 618/281-5120