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HORIZON EN—vrjRON%fENTAI, INC. <br /> Soeciohrs in Sne Pssessmem.kemeo:d ie.+y`�esign enc Operator �, <br /> % I <br /> '•vL <br /> December 28. 1998 <br /> Mr.Michael lnfurna_Jr. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Reber Avenue.Third Floor <br /> P.O.Box 388 <br /> Stockton.California 95201-0388 <br /> Subiect: Letter Addendum to Work Plan For A Remedial lnv_e_s_tieation <br /> Beacon Station No.474 <br /> 3440 East Main Street.Stockton <br /> Site Code: 1173 <br /> Mr.Infuma: <br /> In response to the San Joaquin County Public Health Services(Emiromnenta] Health <br /> Division (SJC PHS/EHD) lever of July 30. 1998. Horizon Environmental (Horizon) <br /> proposes to amend the proposed work in the Rork 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(SPVVD)to install a groundwater monitoring well(MW-10)in East <br /> Main Street. This well %%ill be installed to delineate hvdrocarbons 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 ^_. <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 iow <br /> groundwater level. In additional to collecting and subiectiveh 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-.yith a split-spoon sampler or core barrel.while <br /> discreet groundumer samples will be collected at selected depths xith <br /> HydroPunch' sampler. The two deepest soil samples collected at 5-foot <br /> intervals and other selected soil and eroundwater samples from this boring will rp <br /> be sent to the laboratory on expedited turnaround. <br /> 5011 VOfpen;cctnil:Darkwo-,?.are d Jorcac Hi!t' CA 957,62•;015':30.2",70•FAX(916)939-2'_-_ �y y q!i1p� /s <br /> AC.Box 5285•Bo.(ersheic CL 9538= (805)58C,•8389 • ::AY(805 559-145: SAN.1UAQUIN(;OUN t <br /> ENVIRONMENTAL HEALTH DIVISION <br /> - 304 E.Weber Ave.Third Floor <br /> P.O.Box 388,StoddDn,CA--96201-0388 <br /> Phone: (209)468-3420 <br /> Approved <br /> Approved with changes: See Remarks <br /> ❑Disapproved: See Remarks <br /> Remarks <br /> Date <br /> Approval of these plans exte ds only to that <br /> which is shown and described hereon but <br /> does not authorize or approve any omission <br /> or deviation of requirements of State laws or <br /> Local Ordinances. <br />