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r <br /> n HORIZCIIT ENVIRONMENT INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> 77 P-4 <br /> December 28, 1998 Qom = r <br /> Mr. Michael Infurna, Jr. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> P. O. Box 388 <br /> Stockton, California 95201-0388 <br /> Subject: Letter Addendum to Work Plan For A Remedial Investi ation <br /> Beacon Station No. 474 <br /> 3440 East Main Street, Stockton <br /> Site Code: 1173 <br /> Mr. Infurna: <br /> In response to the San Joaquin County Public Health Services/Environmental Health <br /> Division (SJC PHS/EHD) letter of July 30, 1998, Horizon Environmental (Horizon) <br /> proposes to amend the proposed work in the Work Plan for a Remedial Investigation <br /> (Horizon, June 1, 1998) and conduct additional work at the above-referenced site: <br /> Amend Task 1 to include: <br /> Obtain an encroachment permit from the City of Stockton Public Works <br /> Department(SPWD)to install a groundwater monitoring well (MW-10) in East <br /> Main Street. This well will be installed to delineate hydrocarbons in <br /> groundwater to the northwest. <br /> Replace Task 2 with the following: <br /> Task 2.1: Drill an 8-inch diameter soil boring (B-7) at the location shown on Figure 2. <br /> Based on historical groundwater levels quoted by the SJC PHS/EHD, soil- <br /> boring B-7 will be drilled to an approximate depth of 105 feet below surface <br /> grade (bsg) to investigate the soil and groundwater at the historical low <br /> groundwater level. In additional to collecting and subjectively analyzing soil <br /> samples using an organic vapor meter (OVM) at five-foot depth intervals, <br /> continuous soil samples will be collected from approximately 90 feet below <br /> surface grade to the total depth with a split-spoon sampler or core barrel, while <br /> discreet groundwater samples will be collected at selected depths with a <br /> HydroPuncO sampler. The two deepest soil samples collected at 5-foot <br /> intervals and other selected soil and groundwater samples from this boring will <br /> be sent to the laboratory on expedited turnaround. <br /> 5011 Golden Foothill Parkway,Sulte 7 • EI Dorado Hills,CA 95762 • (916)939-2170 . FAX(916)939-2172 <br /> P.O.Box 5283 • Bakersfield,CA 93388 9 (805)589-8389 . FAX(805)589-1456 <br />