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COMPLIANCE INFO_1992-1993
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PR0440079
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COMPLIANCE INFO_1992-1993
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Last modified
6/24/2021 9:44:14 AM
Creation date
7/3/2020 11:19:28 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
4400 - Solid Waste Program
File Section
COMPLIANCE INFO
FileName_PostFix
1992-1993
RECORD_ID
PR0440079
PE
4461
FACILITY_ID
FA0001192
FACILITY_NAME
MACDONALD ISLAND/SHIELDS NATL
STREET_NUMBER
111
Direction
N
STREET_NAME
ZUCKERMAN
STREET_TYPE
RD
City
STOCKTON
Zip
95206
APN
12908053
CURRENT_STATUS
02
SITE_LOCATION
111 N ZUCKERMAN RD
P_LOCATION
99
P_DISTRICT
003
QC Status
Approved
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SJGOV\sfrench
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FilePath
\MIGRATIONS\SW\SW_4461_PR0440079_111 N ZUCKERMAN_1992-1993.tif
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EHD - Public
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STA-K OF CALIFORNIA—ENVIRONMENTAL PRS':, ON AGENCY PETE WILSON,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD -=,, ,fMf,i_ l zr ,ry <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD,SUITE A o <br /> SACRAMENTO,CA 95827-3098 ; !® 9 <br /> PHONE: (916)255-3000 I _"'' 1 " e l <br /> FAX: (916)255-3015 <br /> 12 August 1994 <br /> Ms. Patricia Sullivan <br /> Environmental Services <br /> Pacific Gas and Electric Company <br /> P.O. Box 7640 - <br /> San Francisco, CA 94120 <br /> PG&E MCDONALD ISLAND SURFACE IMPOUNDMENTS, SAN JOAQUIN <br /> COUNTY (Case No. 2288) <br /> We have reviewed the soil sampling and analysis plan prepared by Trident Environmental for closure <br /> of the drilling mud disposal ponds on McDonald Island. The ponds will be closed by removing the <br /> drilling mud and six inches of native subgrade from Pond 3. The three pond levees will then be <br /> regraded to a one percent slope. During excavation, composite soil samples will be collected on a <br /> grid pattern from the exposed subgrade in Pond 3. The soil samples will be analyzed for specific <br /> conductance (EC) using a 1:1 extraction with water, and for soluble chloride, sulfate and barium <br /> using the waste extraction test(WET)method with deionized water. The sample results will then be <br /> compared to the limits proposed in the Trident report to demonstrate that the soil under the pond is <br /> not a threat to water quality. <br /> The limits proposed by Trident are not acceptable. The proposed limit for EC of 3734 µmhos/cm <br /> was calculated from background soil samples. The background soil samples included clays, silts <br /> and peats but not sand as found under the ponds. We believe sand samples would have significantly <br /> lower-EC values. T he proposed limit of 37/34 µitihos/cm for EC should be changed to i 500 <br /> µmhos/cm. We note background ground water EC is between 1500 and 1800µmhos/cm, so the <br /> revised limit is conservative. If the soil EC test method is changed from a 1:1 extraction to the WET <br /> method using the 10:1 dilution, then the limit should be 150µmhos/cm. Given the potential for high <br /> variability in EC due to soil types and possible analytical difficulties, we will use the EC limit as an <br /> indicator parameter rather than absolute criteria during the cleanup process. <br /> The proposed limits for chloride, sulfate and barium are based on the designated level methodology <br /> using background ground water quality data. The attenuation factors used by Trident were 10 for <br /> chloride and 15 for sulfate. We believe these values are ten times too high for a site underlain with <br /> sand and ground water at a depth of less than ten feet. The limits for chloride should be changed <br /> from 409 to 40 mg/1 and for sulfate from 484 to 50 mg/l. The level for barium should be changed <br /> from 1.98 mg/1 to the drinking water standard of 1.0 mg/l.. <br />
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