DIR-2004-21b
CITY OF CUPERTINO
10300 Torre Avenue, Cupertino, California 95014 (408) 777-3308
To: Mayor and City Council members
Chairman and Planning Commissioners
From: Steve Piasecki, Director of Community Development
Gary Chao, Assistant Planner
Date: September 21, 2004
Subject: Director's Minor Modification to install an ozone injection and soilvapor
extraction treatment system at an existing gasoline station located at 19550
Stevens Creek Boulevard
Chapter 19.132 of the Cupertino Municipal Code allows for administrative
approval of minor changes in a project. The Director reports his decision
to the City Council and Planning Commission in time to allow an appeal
of the decision within fourteen calendar days.
DISCUSSION:
The applicant SECOR proposes to install an ozone injection and soil vapor extraction
treatment system at an existing gas station. The system is designed to oxidize and
remove soil and ground water contaminants/volatile organic compounds from leaky
underground storage tanks. This is to satisfy the requirements of the Santa Clara Valley
Water District (SCVWD). The project site is located at the southwest corner of Stevens
Creek Blvd. and Miller Ave. The treatment system is temporary and will only be there
for six months. Once the remediation process is complete, the SCVWD will certify that
the site is cleaned and the equipment will be removed permanently. An eight-foot tall
chain link fence will be enclosing the equipment located at the southeast corner of the
property. Planter boxes with shrubs are proposed on each side of the enclosure to help
screen the equipment.
ACTION:
The Director approves the application, file no. DIR-2004-21, with the following
conditions:
1) The Director of Community Development deems the modification minor and
approves the proposed ozone injection and soil vapor extraction treatment
system based on the attached plan set titled: "Ozone Injection and Soil Vapor
Extraction Treatment System, 76 Station (Former BP) No. 11220, 19550 Stevens
Creek Blvd., Cupertino, CAlf consisting 10 sheets dated May 5, 2004 unless as
amended by the conditions of approval of this project.
2) This approval of the modification is effective September 21,2004. The 14-
calendar day appeal period will expire on October 5, 2004.
3) The proposed ozone injection and soil vapor extraction treatment system shall be
removed after six months from the time of the approval (AprilS, 2005). If
additional time is required, a new director's minor modification shall be obtained
from the Planning Department.
4) The project shall be consistent with the recommended noise mitigation measures
specified in the Noise Assessment and Mitigation Study prepared by Stanton
Shelly dated September 2, 2004.
Enclosures:
Plan Set
Noise Assessment and Mitigation Study
G: \ Planning \ PDREPORT\ DIRrcports \ DI R-2004-21.doc
..........------------_..._,..._.........._----_...----------~ ..........-.....----......--.......-......------------............-----.---..--........------------...-.............-...--......--.--------
Environmental Consulting Services
Phone: (408) 257-1045
18488 Prospect Avenue - Suite 1, Saratoga, CA 95070
stanshe1l99@toast.net FAX: (408) 257-7235
----.........--...-------------------.--.......----..................---.---------....--.-----.----.....---------------------.......................---------..-...--.......-.------.---------...-
September 2, 2004
Mr. Thomas Gilman
Staff Engineer
Secor International Incorporated
3017 Kilgore Road - Suite 100
Rancho Cordova, CA 95670
Re: Noise Assessment and Mitigation Study - Remediation Equipment
Union 76 Service Station 11220, 19550 Stevens Creek Blvd., Cupertino
Dear Mr. Gilman,
At your request I have performed a study of the potential noise impacts from the remediation unit to
be installed at the subject Union 76 station. This report presents the results of the equipment noise
modeling and analysis, the relevant City of Cupertino noise ordinance standards, and general
recommendations for the necessary mitigation measures to comply with City noise ordinance standards.
The remediation equipment will be installed behind the Union 76 station, about 5 feet from the
property line ofthe adjacent neighbor, which is a small office complex to the south. The equipment to be
installed includes a 1000 gallon holding tank, a distribution panel, a ozone sparge panel, and on a trailer a S
hp vacuum blower, a vapor water separator, an 8-foot exhaust stack and a control panel. The entire set of
equipment will be enclosed in a rectangu lar chain link fence approximately 15 feet by 16 feet.
AMBIENT NOISE MEASUREMENTS
Noise measurements were made at the property line near the proposed remediation equipment
location during the morning commute period of August 19,2004 and also on the night of August 26,2004,
with a CEL-440 Precision Noise Meter and Analyzer, and calibrated with a B & K Model 4230 Sound
Level Calibrator. The measurements are shown in Exhibit I below. Noise levels were measured and are
reported using percentile noise descriptors: L90 (the background noise level exceeded 90 % of the time),
LSO (the median noise level exceeded 50% of the time), LJ (the peak level exceeded 1% of the time), and
Leq (the average energy-equivalent noise level). Measured noise levels are presented in Exhibit I below:
Measurements using A weighting (commonly abbreviated dBA) de-emphasize the low frequencies and high
frequencies to match human hearing sensitivity for average sound levels. Community noise readings
typically are taken using dBA, and most noise ordinance standards are specified in dBA, including the City
of Cupertino noise ordinance.
EXHIBIT I
AMBIENT NOISE LEVELS (dBA)
Period L90 LSO Leq Ll
Morning 54 59 6] 69
Night 49 53 56 65
Noise Impact and Mitigation Study, Union76 Remediation, Cupertino
Page 2 of2
DISCUSSION OF AMBIENT NOISE MEASUREMENTS
The ambient noise levels in this area are dominated by traffic on the nearby two arterial streets,
Miller Avenue (approximately 50 feet east) and Stevens Creek Boulevard (approximately 150 feet north).
ANTICIPATED NOISE LEVELS TO BE PRODUCED BY THE PROJECT
According to manufacturer's information provided by SECOR, the 5 hp vacuum blower produces 75
dBA at a distance of three feet, and the V4 hp air compressor for the ozone system produces 60 dBA at I
foot. Both ofthese will be located 10-13 feet from the nearest property line. According to SECOR
information, other equipment on site produces less noise than these two sources. Modeling the noise level
from manufacturer's data results in a property line noise level of 65 dBA. This noise level is marginally in
compliance during daytime hours, but is in violation during the night time period. This is discussed in more
detail in the following section.
COMPLIANCE WITH CITY OF CUPERTINO NOISE STANDARDS
There are no residential uses near this project, so the part of the Cupertino Noise Ordinance that
applies to this project is section 10.48.040, Daytime and Nighttime Maximum Noise Levels, which limits
noise produced by a source adjacent to a commercial property to 65 dBA during Daytime hours (7 am to 8
pm) and 55 dBA during Nighttime hours (8 pm to 7 am). This limit is enforced at the property plane ofthe
adjacent land use. Since the remediation equipment must be in operation at any time of the day or night to
be effective, the equipment must be mitigated to achieve compliance with the more strict evening noise
limit of 55 dBA at the property line. The noise level for the equipment must therefore be reduced more
than 10 dBA to insure meeting the noise ordinance limit for the evening period. The vacuum blower is the
item responsible for the high noise level and must be mitigated. Other equipment would be in compliance
during both day and night periods.
RECOMMENDED MITIGATION MEASURES
The required noise reduction of at least 10 dB could be achieved with a full enclosure along the
south, east and west sides and cover the trailer-based equipment holding the vacuum blower. The partial
enclosure should extend back to the tall exhaust stack and be open toward the station and Stevens Creek
Blvd, and have a top back that far. For ease of access to the equipment for maintenance, the enclosure
should be 6 to 6.5 feet above the trailer bed. The best material for the enclosure would be 5/8" plywood,
with no openings or cracks except the open end facing Stevens Creek Blvd. Most of the intcrior of the
enclosure should be lined with a noise absorbing material such as 2" thick semi-rigid fiberglass sheets
available from several manufacturers.
With this type of enclosure in placc, the equipment will meet the Cupertino noise ordinance limits.
Please let me know if you require more information.
Respectfully submitted,
,~,,~t&1 _
H~ Stanton Shelly ~~-
Acoustical Consultant
Board Certified Member (] 982)
Institute of Noise Control Engineering
Environmental Consulting Services
Saratoga
OZONE INJECTION AND SOIL VAPOR EXTRACTION
TREATMENT SYSTEM
76 STATION (FORMER BP) NO. 11220
19550 STEVENS CREEK BLVD.
CUPERTINO, CALIFORNIA
GENERAL NOTES
THE SCOPE OF V'JORK INCLUDES INSTALLATION OF PIPING AND INSTALLING AND MOUNTING
PROCESS EQUIPMENT FOR THE PURPOSE OF EXTRACTING AND TREATING SOil VAPOR
AND INJECTING OZONE. PIPING WILL BE INSTALLED TO FIVE (5) SOIL VAPOR EXTRACTION
WELLS (SVE-1 THROUGH SVE-5)AND ELEVEN (11) OZONE SPARGE WELLS
/0$-1 THROUGH OS-11)
THE II'KlRK UNDER THIS CONTRACT INCLUDES FURNISHING ALL LABOR MATERIALS,
AND EQUIPMENT NOTSUPPUED BYOTHERS TO CONSTRUCT THE SOIL VAPOR
EXTRACTION AND OZONE INJECTION SYSTEMS,lNClUDING WELLHEAD'NORK$,
ELECTRICAl AND MECHANICAL EQUIPMENT, EARTHWORKS, AND OTHER RELATED
WORK TO PROVIDE A COMPLETE OPERABLE SYSTEM
CERTAIN SPECIFIED ITEMS WILL BE SUPPLIED BY OTHERS. THE CONTRACTOR
SHALL COORDINATE DELIVERY OF THESE ITEMS WITH THE ENGINEER TO
FACILITATE THE CONSTRUCTION SCHEDULE, THE CONTRACTOR IS RESPONSIBLE
FOR RECEIVING, UNLOADING, STAGING, INSTALLATION, AND TESTING OF THESE ITEMS.
PRIOR TO CONSTRUCTION, CONTRACTOR SHALL VERIFY ALL FIELD DIMENSIONS
AND EXACT LOCATION AND DEPTH OF EXISTING UTILITIES, PROTECT IN PLACE,
AND IF DAMAGED, CONTRACTOR SHALL REPAIR THEM AT NO ADDED EXPENSE
TO OWNER. CONTRACTOR SHALL BE RESPONSIBLE FOR SUBSURFACE OBSTACLES
ENCOUNTERED DURING EXCAVATION
CONTRACTOR SHALL BE REQUIRED TO SAW CUT EXISTlNG CONCRETE AND
ASPHALT IN ANEAT STRAIGHT LINE, AND REPLACE SURFACE WITH SAME
MATERIAL UPON COMPLETION, SPECiAl CONDITIONS USE OF TRENCH PLATES
AND HOURS OF OPERATION TO BE ADDRESSED DURING JOB WALK
CONTRACTOR SHALL INSlALLALL PIPING AND CONDUITS, ACCORDING TO ALL
LOCAL, STATE, AND FEDERAL CONSTRUCTION CODES, IF REQUIRED SECOR
SHALL OBTAIN ENCROACHMENT PERMITS REQUIRED BY THE CITY AND
CALTRANS TOCONDUCTTRENCHING, CONTRACTOR SHALL INTERFACE
\NlTH BUILDING INSPECTORS TO PROVIDE 01M'<ER WITH FINAL
SIGNED-OFF BUILDING PERMIT AT COMPLETION OF JOB
SITE LOCATION MAP
(fJOTT,jSCAcE)
EQUIPMENT SUMMARY (SUPPLIED BY ENGINEER)
DESCRIPTION
MANUFACTURER & MODEL NO
ELECTRICALlCATALYTIC OXIDIZER WITH
VACUUM PUMP, KNOCK-OUT POT,
AND CONTROL PANEL
KVA C-SPARGE
DRAVVlNG INDEX
1, T1TLE SHEET AND SITE LOCATION MAP
2_ COr4STRUCT10N NOTES
3 SITE PLAN
4. TREATh1ENTCOMPOUND PLAN
5, TREATMENT COMPOUND SLAB
6, PIPING DETAILS
7, TRENCH AND WELLHEAD DETAILS
e, TREATMENT COMPOUND CHAIN-LINK FENCE DETAILS
9. ELECTRICAL DETAILS
10. PROCESS AND INSTRUMENTATlON DIAGRAMS
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A. SCOPE:
B. GENERAL NOTES:
8. OONTRA~TOR E-lALL HO' I"O'SPONSIBLE FOF. 1/::"1 F"l"'G ALL FI:::..o :>IMENSIONS W~H eNGINCCR ANDIOR OWl\E"l
BEFORE BEGI"lNING OFWORK. THE :::"lGINEER SHALL BE NOTIFIED OF AJ-,; vDISCREPAJ-,;CY
C. PERMITS:
PERMITTING AGENCY
PERMIT API". SUBMITTED BY
PERMIT OBTAINED BY
B ALL SI)E\"IALKS AND OT.,ER IMPROV"MEN IS WHIC-l SURRCU"lD ~HE PROPER~Y S'-lALL REMAIN UNDISTURBED B SURFACI"lG SHALL 8EOlEPLAc:ED WITH II\;-KIND ~AVf';Vf,N", UNLH,S ~HDWN DT'"IERWISE, AND ~HI\LL BE
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IJ-,;JURY CLA; M WHICI- MIGHT A"lISEAS A RESULT OF T -lIS PROJECT
H? OO\lTlACTORSHALLCOORDIf\ATE ALL WORK WITH OWNERTO MIJ-,;M Z:::JISRUPTIO"J -0 BUSINESS OPERATIC\lS
AND TRAFFIC
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D. TRENCHING, EXCAVATION, CON CRETE AND PAVING:
1 EXISTING ASPHALT AND CON8RET'C SURFACES SHALL BE SAWCUT ALOf\'['l A STRAI(JH
R(MQVALAND SOl L EXCAVATION
? UTIUTYTRENCHES SHAL BEEXCAVATEDA MINI\1JM OF 21NCHES DEEPER THAll; THE I"lVE8T OF INSTAllED
PIPES. ALL BEeDW GRADE PIPINGSI-'A~L HAVE A ...,iNIMUM BVlvOF24INC...JES IEXCEPT WHERESrECI=IED)
PLEASE REFER TO SHE:::T 7 FOR MNIMlN, T"IENCH BAC;(=ILL REQUIREMENTS WHICI- APPLY TC AL_ SITE
TRENCHING
5 CONTRACTOR SHAll BE RESPOJoiSi8LE FOR KEEPING PAIN WATER FROM OVErlSATLPAllNG TRENC-lES, IF
OVERSATUFATIO\l OCCURS. CONTRACTOFSHAlL RE'-EDY A T CWN COST -0 MAl NTAI "I SCHEDULE
ASPHALT =AVEM:::\lT SHALL BE IN ACCORDANCE WITH CALTflANS STANDARD S~ECiFICA~IONS LATEST
EDiTION, FOR TYPE BASPHALTCONCRETE. SAWClT EDGE OF EXS~ING ASPHAl..~ S;.JALL BE C_EANED AND
SHALL HAVE A COAT OF LeUID ASPHALT APPLIED PF.lOR TO CONSTRLX.;TION OF NEW ASPHAL~ PAVEMENT.
PAVEMEl\T STnIPPING ShA~L BE RESTOREC TO EXISTI NG OR BET":ER CONDITION
CONTRACTOR SHALL REMCVEA1\D DIS"'OSE OF iU. EXCAVAED ASPHALT ANC CO"lCRETE FROM THE SITE
AS RECUIRED BY A'IIYTRENCHING AND EXCAVATION
10 THE COl',TRACTOR SHAll USE ONLY OCCUPANT APPRO\f:OD CN-SITE AOCflS FOR STORING CONSTRlX:TION
MA TER!ALS ANC EQUIPME"IT, AND FCP STCCK"ILlN('l EXCAVA lED sel... CR fJf'MOI.1l10N DEBRIS
E. TREATMENT COMPOUND:
1, EQUIP'-ENT ENCLOSJRE SHAL~ BE EQUIP"EC WITH A 1 OA: 606: C PORTAOLC EXTlJoiGUISHCR, nRC
EXTINGUlSHEfl S'iALL BE ATTACHED TU FENCE N,~A", l''IIIQy G"II ~
2 (XlNT RAGI OR SHAL_INST ALL EMERGENCYREE =ONSE AND PROPOSITION esSIGNS ON OJTS! DE
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F. PLUMBING AND ELECTRICAL
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SHALL BE ATTCHED T,) tJNI~T"UT (OR EQUIVALENT) AT b FOCT
SPAC'NG, USE UNISTRUTP'PECLAMP OREQUVALENT
5. ANY PANB.. OR SUPPORT 8RAC'''IG USED TO MOL"!T ELECTRIC!\:..
BOXES SHALL BE PANTED MACHINE GRAY COMPLETEL'f: PRIOR TO
INSTALlATlONO=THE 30XES
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2 1j2'HIlPEomNESPARGELI'JESSHALLBEDOlIBLE
CONTAINED;N2'DIAMETERSC-IED'jcE4CPVC
3 BELDW GROUND S'/E AND OZONE PIPING SHALL BE
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77CP.60220.02
SHEET
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SOCKET PANEL (t.1DUNTED ON
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200A 1f 240/120 v.
4 WI~E ELECTRICAL SEf\VICE
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CONDUIT SIZE & WIRING
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NOTES
1 DISTRIBUTION PANEL IN CO~POUND SI-IAll BE MOUNTED
ON UNISTRUT SUPPORTS SCREWED TO CONCRETE PAD
2. CONTRACTOR TO SUPPLY AND INSTALL UOflTING UNITS
WITH SWITCH. LIGHTS SHALL BE 70 WATT MIN.. 20 AMP
MIN, CONVIENCE CIRCUIT WITH GFI OVTlETS />S SHOWN.
} AlL WIRE TO BE INSULATED COPPER (THHll) 90' C
STRANDED
4 GROUND WIRE TO BE SARE COPPER
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� END��RSED �-�
� �,��06'�
NOU 1 8 2004
City of Cupertino
�BRENDA DAVIS, County Clerk-Recorder 10300 Torre Avenue
`Santa Clara Coun y
By -- �� Deputy Cupertino, CA 95014
Notice of Exemption �-'��`'��' ������
To: County Clerk-Recorder � � 8 2 ��y
70 W. Hedding Street, 1 Floor p� p�,T N� i�f�.oUGi� �FC 1 8 2004
East Wing-Business Division zN 'i cii: �)��: iCZ, t,F� .'�I¢� C��t�NT� CLERK-RECORllER
San Jose, CA 95110 Ftzf,�vt}:� �.���v[�, Ct�ilt�t'rY CL�RK
�3� � DEPUTY . _
Project Title: DIR-2004-21 -
Project Location -(be specific): 19550 Stevens Creek Boulevard
Project Location -(City):Cupertino Pi•oject Location -(County): Santa Clara
Description of Project: Director's Minor Mo3ification to install an ozone injection and soil
vapor extraction treatment svstem at an existin�; gasoline station
Name of Public Agency approving project: C'itv of Cupertino
Name of Person or Agency carrying out project: Rusty Benkosk�(76 Station)
Exempt Status: (check one)
_ Ministerial (Sec. 21080(b)(1); 15268);
_ Declared Emergency (Sec. 21080(b)i;3); 15269(a));
_ Emergency Project (Sec. 21080(b)(41; 15269(b)(c));
` x Categorical Exemption. State type ar�d section number: 15311
_Statutory Exemption. State code number:
Reasons why project is exempt: Temporarv soil treatment station on an existin�gas station
Lead Agency
Contact Person: Garv Chao Area code/telephone number�408) 777-3247
Signature ���" ` '-� �� D�ite: Sept. 21, 2004 Title: Assistant Planner
`,.
i
g/planning/erc/dir2004021
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